JP4156465B2 - Fuel injection valve control device - Google Patents

Description

  The present invention relates to a fuel injection valve control device that is used in an internal combustion engine for a vehicle and drives a fuel injection solenoid valve at a high speed corresponding to the pressure of fuel discharged from a high-pressure fuel pump.

  A fuel injection device that supplies fuel to an internal combustion engine for a vehicle calculates a fuel injection amount to be supplied based on a signal of a sensor group that detects an operating state of the internal combustion engine, and opens a valve opening timing and a valve opening period. And a valve opening signal generating means for outputting a valve opening signal, and applying a high voltage to the driving electromagnetic coil of the fuel injection valve according to the signal of the valve opening signal generating means to perform a quick valve opening drive Electric power is supplied to a power supply control means that keeps the valve open by a low current, a fuel pump that supplies high pressure fuel of variable pressure limited by a constant pressure relief valve from the fuel injection valve to the internal combustion engine, and a sensor group and control means. A main power source and an auxiliary power source that boosts the voltage of the main power source and supplies current to the electromagnetic coil of the fuel injection valve when the valve is opened are widely used.

  For example, the techniques disclosed in Patent Literature 1 to Patent Literature 3 are also such, and the technology disclosed in the injector driving circuit of Patent Literature 1 applies a high voltage to the solenoid only at the beginning of driving when driving the injector. When a large current is applied and the solenoid current exceeds a certain threshold value and the valve is held open with a small current, the high voltage at the beginning of driving is a rectangular wave constant voltage using a large capacity capacitor. And a fuel pressure sensor for detecting the fuel pressure is provided to change the high voltage at the start of driving in accordance with the fuel pressure, thereby speeding up the valve opening time.

  Further, the technology disclosed in the fuel injection control device of Patent Document 2 includes a fuel pressure regulator that adjusts the fuel pressure of the injected fuel, an injector driving means that energizes an electromagnetic coil of the injector and drives the valve body to open and close, and an internal combustion engine Injection control means for controlling the fuel pressure regulator and the injector drive means in accordance with the rotational speed of the engine, the intake air amount, and the fuel pressure. The injection control means includes an injection timer for setting the excitation time of the electromagnetic coil, and an initial energization. Has an overexcitation timer that supplies an overexcitation current and an overexcitation period control unit that variably sets the overexcitation timer according to the fuel pressure. The overexcitation period is variably set so that the energization period becomes longer as the fuel pressure increases. It is what you do.

  Further, the technology disclosed in the fuel injection control device of Patent Document 3 energizes each sensor such as a fuel pressure regulator means for adjusting the fuel pressure of the injected fuel, a fuel pressure sensor for detecting the fuel pressure, and an electromagnetic coil of the injector. The injector drive means for opening and closing the valve body and the injection control means for controlling the fuel pressure regulator means and the injector drive means corresponding to the operating state of the internal combustion engine, the injection control means is a holding current of the injector Has a holding current value control unit that variably sets and an overexcitation period control unit that performs overexcitation, and controls the overexcitation time according to the fuel pressure, and the holding current value control unit decreases the holding current as the fuel pressure decreases. In this way, the variable setting is made.

  Furthermore, the technique disclosed in the vehicle control device of Patent Document 4 is such that when the throttle valve system that controls the intake air amount of the internal combustion engine becomes uncontrollable, the throttle valve cannot be controlled at a position close to full closure. Controls the intake air amount with the idle speed control valve in proportion to the accelerator operation amount.When the throttle valve cannot be controlled except at the position close to the fully closed position, the cylinder suspension control based on the accelerator opening is performed. This makes it possible to save time.

  In addition, the technique disclosed in the high pressure fuel supply device for an internal combustion engine of Patent Document 5 is a fuel supply device in which fuel in a delivery pipe is held at a high pressure by a high pressure fuel pump and fuel is injected according to the pressure. When an abnormality occurs in the fuel pressure sensor that measures the pressure, pressurization by the high-pressure fuel pump is stopped, the fuel pressure immediately before the occurrence of the abnormality is set as the initial value, and the fuel pressure in the delivery pipe that decreases at each fuel injection is calculated and estimated. However, the escape operation can be performed by controlling the fuel injection time.

Japanese Patent Laid-Open No. 11-351039 (pages 4 to 6, FIGS. 1 to 7) JP 2000-30388 (pages 4 to 5, FIGS. 1 to 4) Japanese Patent Laid-Open No. 2001-132524 (pages 6 to 7, FIGS. 1 to 2) Japanese Patent Laid-Open No. 06-249015 (pages 3 to 5, FIGS. 1 to 5) Japanese Patent Laid-Open No. 11-210532 (pages 3 to 7, FIGS. 1 to 5)

  As described above, the techniques disclosed in Patent Document 1 to Patent Document 3 are a fuel injection valve configured to require a large valve opening driving force as the fuel pressure rises, and the drive supplied to the electromagnetic solenoid of the fuel injection valve. The current is variably set according to the fuel pressure by detecting the fuel pressure, and the drive current is set to the minimum necessary value to reduce power saving and response delay time of the fuel injection valve. is there. However, if an abnormality occurs in the fuel pump that supplies fuel to the fuel injection valve or the fuel pressure control means that controls the fuel pressure, and the fuel pressure rises abnormally, the valve opening drive force is insufficient and fuel injection cannot be performed, Alternatively, an excessive valve-opening drive current is required, which may lead to burning of the drive control circuit and the solenoid valve itself.

  Further, Patent Document 4 and Patent Document 5 are technologies related to the saving operation at the time of abnormality, but the technology disclosed in Patent Document 4 is related to the abnormality of the throttle control system, not the saving operation at the time of abnormality of the fuel pressure. The technique disclosed in Patent Document 5 is a save operation when the fuel pressure is abnormal. However, the save operation is performed by the fuel remaining in the delivery pipe or the feed pump, and the save operation is limited. It was.

  The present invention has been made to solve such a problem, and even when an abnormality occurs in the fuel pressure control means, fuel injection is possible, and a retreat operation can be performed so as not to cause a burning accident. An object of the present invention is to obtain a fuel injection valve control device.

A fuel injection valve control device according to the present invention calculates a fuel supply amount to a fuel injection valve based on an operating state of an internal combustion engine and outputs a valve opening signal for setting a valve opening period, a vehicle An auxiliary power source that boosts the voltage from the main power source mounted on the power source and outputs a high voltage, and a first power supply from the auxiliary power source to the electromagnetic solenoid of the fuel injection valve at the valve opening timing by the signal of the valve opening signal generating means The opening / closing element of the power supply, continuously supplying the voltage from the main power source to the electromagnetic solenoid following the rapid power supply, and the valve-opening holding current subjected to feedback control necessary for holding the valve open during the valve-opening period after the continuous power supply a second switching element for supplying power to the electromagnetic solenoid, the intake air quantity control means for controlling the intake air amount of the internal combustion engine, the fuel pressure detecting means for detecting the pressure of fuel supplied to the fuel injection valve, of the auxiliary power supply output Auxiliary power source abnormality detecting means for pressure is detected that does not reach the predetermined value within a predetermined time, an auxiliary power supply abnormality processing unit that operates when the auxiliary power source abnormality detection means detects an abnormality, the fuel pressure detecting means by changing at least one of the current value of the current value of the valve opening holding current value of the rapid power feed to changes in the fuel pressure to be detected is changed at least one of the valve opening force and the valve opening holding force , when the rotational speed before Symbol fuel pressure detecting means for detecting fuel pressure the internal combustion engine is equal to or larger than the predetermined value is a predetermined value or more, the fuel supply amount, or suppresses controls at least one of the intake air amount, The auxiliary power supply abnormality processing means delays the end timing of the valve opening drive signal according to the signal of the auxiliary power supply abnormality detection means, or advances the output timing of the valve opening signal to advance the valve opening drive signal. The end time is obtained so as to delay.

  The fuel injection valve control device according to the present invention changes at least one of a current value for rapid power feeding and a current value for holding the valve opening in response to a change in fuel pressure, so that at least one of the valve opening force and the valve opening holding force is changed. While changing one, when the fuel pressure is equal to or higher than a predetermined value and the rotational speed of the internal combustion engine is equal to or higher than the predetermined value, at least one of the fuel supply amount and the intake air amount is controlled to be suppressed. For this reason, even if the fuel pressure rises abnormally, a sufficient valve opening force and valve opening holding force can be maintained, and the high pressure fuel system relief valve is operating or at a fuel pressure higher than that. On the other hand, the vehicle can be operated by rapidly opening and maintaining the valve opening, and the rotation speed of the internal combustion engine does not increase more than the rotation speed during normal traveling when the fuel pressure is abnormal. Therefore, the evacuation operation can be performed with stable operation while preventing the electromagnetic solenoid of the fuel injection valve and the control switching element from burning out.

Embodiment 1 FIG.
1 to 3 illustrate a fuel injection valve control apparatus according to Embodiment 1 of the present invention. FIG. 1 is an overall circuit diagram illustrating the configuration of the fuel injection valve control apparatus, and FIG. FIG. 3 is a time chart for explaining the operation. In FIG. 1, electric power is supplied from a main power supply 1 to a fuel injection valve, a control device, and the like via a key switch 2. The main power source 1 is, for example, a 12V system on-board battery, and the actual working voltage varies from about 10V of the minimum value Vbmin to about 16V of the maximum value Vbmax due to a change in the driving state of the vehicle.

  The power of the main power supply 1 is supplied to a constant voltage power supply 3, where it is converted into a stable constant voltage of, for example, DC 5V and supplied to the CPU 4a. The CPU 4a includes a nonvolatile program memory F-MEM such as a flash memory, a RAM for arithmetic processing, and the like, and receives information input from the sensor group 5a that detects the operating state of the internal combustion engine and calculates control conditions. The sensor group 5a includes, for example, a number of ON-OFF sensors and analogs such as a rotation sensor, a crank angle sensor, an air flow sensor AFS, a fuel pressure sensor, an air-fuel ratio sensor A / F, an accelerator position sensor APS, a throttle position sensor TPS, and a water temperature sensor. These outputs are input to the CPU 4a via an input interface (not shown) or an A / D converter.

  The electric load group 5b is driven from the CPU 4a through an interface circuit (not shown), and is provided in an ignition coil when the internal combustion engine is a gasoline engine, an actuator (for example, an electric motor) that drives an intake throttle valve, and a fuel pump. There is an electromagnetic spill valve for fuel pressure control. As will be described later, an electromagnetic solenoid 6 that opens and closes an electromagnetic valve provided in the fuel injection valve is also driven by a signal from the CPU 4a. The CPU 4a performs various controls of the internal combustion engine and will be described below. As described above, the fuel injection function is controlled.

  That is, based on information input from various sensors constituting the sensor group 5a and the program stored in the nonvolatile memory F-MEM, the CPU 4a determines the characteristics (a) and (b) in FIG. It has a function of a valve opening signal generating means for outputting a valve opening signal PL1 and a valve opening drive signal PL2 shown. This valve opening signal PL1 is generated in the compression stroke of the internal combustion engine in a direct injection type internal combustion engine, and is closed from the opening timing of the fuel injection valve in accordance with the rotational speed of the internal combustion engine, the amount of fuel to be supplied, and the fuel pressure. The logic level becomes H during the entire period up to the valve timing, and the valve opening drive signal PL2 has a logic level H during a predetermined period Tk after the valve opening signal PL1 becomes H level. Thus, the valve-opening drive signal PL2 has a logic level of H in a total period of a rapid power supply period and a continuous power supply period, which will be described later.

  The auxiliary power source 7 surrounded by a dotted line in FIG. 1 includes an induction element 8, a diode 9, a high voltage capacitor 10, an excitation switching element 11, a current detection resistor 12, a gate circuit 13, a drive resistor 14, and a determination circuit 15. This is an auxiliary power source for high voltage. Power is supplied to the induction element 8 from the main power supply 1 through the excitation switching element 11 and the current detection resistor 12, and is stored in the induction element 8 by opening the excitation switching element 11. The electromagnetic energy is discharged to the high-voltage capacitor 10 via the diode 9, and the high-voltage capacitor 10 is configured to be charged with a high voltage. The gate circuit 13 receives the output of the inverting logic element 16 for inputting the valve opening drive signal PL2 and when the valve opening drive signal PL2 is at the H level, that is, a rapid power supply period and a continuous power supply period, which will be described later. During this time, the logic output of the inverting logic element 16 becomes L level and is input to the gate circuit 13 so that the conduction of the excitation switching element 11 is prohibited.

  The determination circuit 15 outputs an energization command when the voltage across the current detection resistor 12 is equal to or lower than a predetermined value, and makes the excitation switching element 11 conductive through the gate circuit 13 and the drive resistor 14, and the current detection resistor 12. The energization command is canceled during a predetermined period after the voltage between both ends of the voltage becomes equal to or higher than a predetermined value, the drive of the excitation switching element 11 is stopped, and the high-voltage capacitor 10 is charged during the drive stop period. The high voltage capacitor 10 is charged by repeating the ON-OFF operation of the excitation switching element 11 in this way, and when the charging voltage reaches a predetermined maximum value Vpmax, the determination circuit 15 detects this and detects the excitation switching element. 11 is stopped, and charging to the high voltage capacitor 10 is stopped.

  The valve opening signal PL1 and the valve opening drive signal PL2 output from the CPU 4a are supplied to a logic circuit 17 that controls power feeding. The logic circuit 17 generates a control signal A, a control signal B, and a control signal C based on these signals. Three control signals are output. The control signal A is supplied to the first switching element 21 through the base resistor 18, the drive transistor 19, and the drive resistor 20, and the control signal B is supplied to the second switch through the base resistor 22, the drive transistor 23, and the drive resistor 24. The control signal C is applied to the third switching element 27 via the drive resistor 26.

  The first switching element 21, the second switching element 25, and the third switching element 27 are configured by bipolar or field effect type power transistors, and the third switching element 27 is the auxiliary power source 7. It has a cutoff voltage limiting function having a value higher than the boosted maximum output voltage. Further, the logic circuit 17 is given a function as energization control means for controlling the current of each switching element.

  The first switching element 21 supplies the charging voltage of the high voltage capacitor 10 to the electromagnetic solenoid 6 of the fuel injection valve. Since the voltage of the high voltage capacitor 10 is high, the control signal A becomes H level and the electromagnetic solenoid. 6 is rapidly fed. The second opening / closing element 25 is connected to the electromagnetic solenoid 6 via the backflow prevention diode 28, and the control signal A changes to L level, and the control signal B continues to the electromagnetic solenoid 6 from the main power source 1 during the period of H level. Power is supplied. The third opening / closing element 27 controls to cut off the current of the electromagnetic solenoid 6 and enables the electromagnetic solenoid 6 to be energized only when the control signal C is at the H level. The energizing current of the electromagnetic solenoid 6 is energized through the third switching element 27 and the current detection resistor 29, and a commutation diode 30 is connected in parallel with the electromagnetic solenoid 6, the third switching element 27 and the current detection resistor 29. It is connected.

  The voltage between the terminals of the current detection resistor 29 is given to the logic circuit 17 via the amplifier circuit 31 and the A / D converter 32, and these constitute a current detection means. The logic circuit 17 outputs the above control signals A, B, and C, and outputs an error signal ER described later to the CPU 4a. The reset signal generation circuit 35 outputs a reset signal RST when the key switch 2 is closed and applies it to the CPU 4a and the abnormality storage circuit 33 to reset them. The AND element 36 serves as a rotational speed control means as will be described later.

  The amplifier circuit 31 includes an amplifier 37, a resistor 38 connected between the positive input terminal of the amplifier 37 and the current detection resistor 29, a voltage dividing resistor 39 connected to the output terminal of the amplifier 37 and connected in series to each other. 40, 41, a side voltage dividing resistor 42 connected to a connection point between the voltage dividing resistors 39 and 40, a transistor 43 connected in series to the side voltage dividing resistor 42, and an abnormality display signal output DER of the CPU 4a. The driving resistor 44 is applied to the transistor 43, and an open circuit stable resistor 44a connected between the base and emitter of the transistor 43.

  The voltage across the voltage dividing resistor 41 is connected to the negative input terminal of the amplifier 37 so that a feedback voltage is input. When the abnormal display signal output DER becomes a logic level H, the transistor 43 is driven to conduct. The path voltage dividing resistor 42 is grounded, the feedback voltage to the amplifier 37 by the voltage dividing resistor 41 is configured to decrease, and the determination threshold value of the current detection value by the current detection resistor 29 is configured to be changed. .

  The CPU 4a outputs an abnormality display signal DER when the fuel pressure detected by the fuel pressure sensor of the sensor group 5a exceeds a predetermined value, and the abnormality storage circuit 33 is set by the abnormality display signal DER and the error signal ER. Is done. The CPU 4a outputs a limited rotation signal RPM when the rotation speed of the internal combustion engine exceeds a predetermined value, and the AND element 36 is a fuel that is an AND output of the limited rotation signal RPM and the set output of the abnormality storage circuit 33. A cut signal STP is output and applied to the logic circuit 17. The control signals A, B, and C output from the logic circuit 17 are those shown in the characteristics (e) to (g) of FIG.

  The state of various signals and energization is as shown in FIG. 2, and the valve opening signal PL1 becomes H level during the valve opening driving period (rapid power supply + sustained power supply) and the valve opening holding period, and the valve opening driving signal PL2 is It becomes H level during the valve opening drive period. The control signal A has a logic level H in the first half period of the valve opening drive signal PL2, and the first opening / closing element 21 is turned on during this period, and rapid power feeding is performed. As a result, as shown in FIG. 2C, the exciting current of the electromagnetic solenoid 6 rises and reaches the peak value Ia, and is controlled by the peak current detecting means comprising the current detection resistor 29, the amplifier circuit 31, and the logic circuit 17. The logic level of the signal A returns to L and the rapid power feeding is stopped. The peak current detection means can be constituted by, for example, comparison means for comparing the exciting current of the electromagnetic solenoid 6 with a first threshold value (that is, a predetermined peak current value Ia).

  Further, as shown in FIG. 2 (f), the control signal B is continuously supplied with power at a logic level H during the entire period of the valve opening drive signal PL2 in the H level, and the valve opening signal PL1 is held open. During the period, the logic level changes repeatedly, and the valve opening holding current is controlled. When the control signal A becomes the logic level L during the continuous power supply period of the valve opening drive signal PL2, the first opening / closing element 21 is turned off, but the second opening / closing element 25 is kept conductive by the control signal B. Therefore, as shown in FIG. 2C, the exciting current of the electromagnetic solenoid 6 starts to attenuate from the peak value Ia, and the current attenuates to Ib in the final period of the continuous power feeding.

  The change of the control signal B in the second half period of the valve opening signal PL1, that is, the valve opening holding period is as shown in FIG. That is, as shown in FIG. 2C, when the exciting current of the electromagnetic solenoid 6 exceeds the target upper limit value (holding current upper limit value) Id of feedback control, the logic level becomes L, and the exciting current of the electromagnetic solenoid 6 is fed back. When the target lower limit value (holding current lower limit value) Ie is less than the control lower limit value Ie, the logic level is H. Further, the control signal C is set to the logic level L when the valve opening drive signal PL2 changes from the logic level H to L as shown in FIG. Become.

  Immediately after the valve-opening drive signal PL2 changes from the logic level H to L, the exciting current of the electromagnetic solenoid 6 is reduced from the last value Ib of the continuous power supply shown in FIG. 2C to the attenuation determination current Ic. Meanwhile, the second opening / closing element 25 and the third opening / closing element 27 are non-conductive, and in particular, the exciting current of the electromagnetic solenoid 6 is rapidly increased by the non-conduction of the third opening / closing element 27 capable of high-speed interruption. It attenuates and suppresses the temperature rise of the electromagnetic solenoid 6. When the current of the electromagnetic solenoid 6 is attenuated to Ic, the third switching element 27 is turned on, and the excitation current is gradually attenuated by the effect of the circulating current flowing through the commutation diode 30. In FIG. 2C, the respective current values have a relationship of excitation current peak value Ia> continuous power supply final current value Ib> damping determination current value Ic> target lower limit value Ie of the feedback control current.

  After the valve opening signal PL1 changes from the logic level H to L, the second opening / closing element 25 and the third opening / closing element 27 are cut off. In particular, when the third opening / closing element 27 is cut off, the electromagnetic solenoid 6 Since the commutation by the commutation diode 30 is eliminated, the exciting current is rapidly attenuated, and the fuel injection valve is quickly closed. Depending on the operating state of the internal combustion engine, the valve opening holding period shown in FIG. 2A may be very short. Even in such a case, the valve opening drive signal PL2 is changed from the logic level H to L. The high speed shut-off of the third switching element 27 immediately after the change contributes to the quick valve closing operation. FIG. 2H shows the waveform of the surge voltage generated at both ends when the third switching element 27 is cut off. The maximum value of the surge voltage is the cutoff of the third switching element 27. It is determined by the voltage limiting characteristic.

  FIG. 2 (d) shows the voltage characteristics of the auxiliary power supply 7. During the rapid power supply period when the control signal A is H level and the first switching element 21 is in the ON state, the gate circuit 13 causes the high-voltage capacitor. 10 is prohibited, while the electric charge of the high-voltage capacitor 10 is discharged to the electromagnetic solenoid 6 through the first switching element 21, so that the output voltage of the auxiliary power supply 7 is from the maximum voltage Vpmax at the end of charging. It attenuates to the minimum voltage Vpmin at the end of discharge. When the control signal A becomes L level and the first switching element 21 is turned off, the discharging of the high voltage capacitor 10 stops, but the charging is not yet started and the voltage Vpmin is maintained. When the valve opening drive signal PL2 becomes L level and the continuous power supply period ends, the opening / closing operation of the excitation switching element 11 of the auxiliary power source 7 is started, the high-voltage capacitor 10 is gradually charged and the voltage rises, and eventually reaches the maximum. When the voltage Vpmax is reached, the operation of the excitation switching element 11 stops and prepares for the next discharge.

  Note that the minimum voltage Vpmin of the auxiliary power source 7 is set to be larger than the maximum voltage value Vbmax of the main power source 1, and all of the power supply energy for opening the electromagnetic solenoid 6 is opened. 10 is covered by a part of the electric charge accumulated in the electric power 10, so that no energy is supplied from the main power source 1 to the electromagnetic solenoid 6 during this period, and the sharing of energy is determined. Further, the boosting operation of the auxiliary power supply 7 is stopped during the valve opening drive period that combines the rapid power supply period and the continuous power supply period, and immediately after the valve opening drive period, charging of the high-voltage capacitor 10 is started. Thus, the predetermined voltage Vpmax is surely ensured until the rapid power feeding, so that an overload of the booster circuit during the rapid power feeding can be prevented and a high voltage can be stably obtained.

  As described above, the output voltage of the main power supply 1 varies from the lowest value of about 10 V (Vbmin) to the maximum value of about 16 V (Vbmax) due to changes in the driving state of the vehicle, but the voltage is the minimum value of Vbmin. The specification of the electromagnetic solenoid 6 is set so that the fuel injection valve can be driven to open, and the valve opening holding voltage Vh corresponding to the valve opening holding current Ih = (Id + Ie) / 2 in FIG. = Ih × R (where R is the winding resistance of the electromagnetic solenoid 6) is a small value, and when the voltage of the main power supply 1 is the maximum value Vbmax, the ratio of Vbmax to Vh becomes very large, and the valve opening and holding described later is maintained. It has a margin for a change in the threshold value of the current.

  As described above, in order to stably obtain a small valve opening holding voltage Vh in a high power supply voltage state (Vbmax), the excitation current of the electromagnetic solenoid 6 is slowly attenuated when the second opening / closing element 25 is turned off. The provided commutation diode 30 has an important role, and the ON / OFF cycle of the second switching element 25 is sufficiently shorter than the induction time constant (ratio of inductance to winding resistance) of the electromagnetic solenoid 6. It is set to be. That is, due to the presence of the commutation diode 30, the decay of the exciting current when the second switching element 25 is turned off becomes gentle, and the valve is opened even if the upper limit value Id of the holding current is selected to be a relatively small value. The holding force can be maintained, and the temperature of the electromagnetic solenoid 6 can be suppressed.

  The operation of the fuel injection valve control apparatus according to Embodiment 1 of the present invention configured as described above will be described as follows with reference to FIGS. In the figure, when the key switch 2 is turned on, the CPU 4a starts operating, and outputs a valve opening signal PL1 and a valve opening drive signal PL2 shown in FIGS. 2 (a) and 2 (b). In response to this signal, the logic circuit 17 operates to output the control signals A to C shown in FIGS. 2E to 2G, and the first switching element 21, the second switching element 25, and the third switching signal in FIG. In the period when the valve opening drive signal PL2 is at the logic level L, the high voltage capacitor 10 of the auxiliary power supply 7 is charged to a predetermined voltage. Charging to the high-voltage capacitor 10 is stopped together with the start of the rapid power supply, but the start of the rapid power supply is detected by applying the valve opening drive signal PL2 to the inverting logic element 16, and therefore the inverting logic element 16 detects the rapid power supply. Functions as a means.

  The first opening / closing element 21 performs rapid power feeding to the electromagnetic solenoid 6, and the valve opening drive signal PL2 becomes the logic level H, the control signal A becomes the logic level H, and the first opening / closing element 21 is turned on. The rapid power supply to the electromagnetic solenoid 6 is started, and when the control signal A becomes the logic level H, the opening operation of the fuel injection valve is started. During the period when the logic level of the control signal B is continuously “H”, the second opening / closing element 25 is turned on even after the first opening / closing element 21 is turned off. During this period, the electromagnetic solenoid is turned on. 6 is supplied, and the fuel injection valve is kept open during the continuous power supply period.

  In the valve opening holding period after the valve opening operation is completed, the logic level of the control signal B alternately changes between H and L, and the second opening / closing element 24 performs the ON / OFF operation, and the electromagnetic solenoid 6 is opened. A valve holding current is supplied, and this valve opening holding current is set to a current value as small as possible that is equal to or greater than the minimum current value that the electromagnetic solenoid 6 can keep open. The third opening / closing element 27 is conduction-controlled by the control signal C, and quickly attenuates an excessive attenuation current after the valve opening holding period, or performs a rapid valve closing operation by reducing a delay in valve closing operation due to a gradually decreasing attenuation current. It is configured as follows.

  When the fuel pressure detected by the fuel pressure sensor included in the sensor group 5a exceeds a predetermined value, the CPU 4a outputs an abnormality display signal DER and operates the alarm indicator 34 via the abnormality storage circuit 33. When the transistor 43 of the amplifier circuit 31 is turned on by the signal DER, the voltage at the negative input terminal of the amplifier 37 decreases, and the feedback gain of the amplifier circuit 31 increases. As a result, the peak current Ia, the attenuation determination current Ic, the upper limit current Id for valve opening retention, the lower limit current Ie, and the like, which are the determination threshold values in FIG. Therefore, even if the fuel pressure increases, the valve opening force and the valve opening holding force by the electromagnetic solenoid 6 are compensated. Further, since the abnormality display signal DER is reset when the key switch is turned off, it can be restored to normal even if there is a noise malfunction.

  Further, when the rotational speed of the internal combustion engine becomes, for example, 2000 rpm or more, the CPU 4a outputs a limited rotation signal RPM, which is given to the logic circuit 17 via the AND element 36, so that the control signals A, B, C The logic level becomes L and fuel injection by the electromagnetic solenoid 6 is stopped. Therefore, when the fuel pressure exceeds a predetermined value, the internal combustion period is controlled to rotate below a predetermined rotational speed (for example, 2000 rpm or lower), so that the internal combustion engine can be reliably operated even at light loads such as downhill. It is possible to prevent the electromagnetic solenoid and the control opening / closing element from being burned out by suppressing the rotation.

  The operation equivalent to the logic operation of the logic circuit 17 will be described based on the flowchart of FIG. 3. The operation that is periodically activated is started in step 300, and whether or not the fuel cut signal STP is input in the subsequent step 301. To determine whether to stop the fuel injection. If it is determined that the fuel injection is not stopped, the routine proceeds to step 302, where it is determined whether both the valve opening signal PL1 and the valve opening drive signal PL2 have changed from the logic level L to H, and the logic level H has been changed. In step 303, it is determined whether or not the valve opening drive signal PL2 has changed from the logic level H to L. If it has not changed to L level, the routine proceeds to step 304, where the control signal A is set to H level, the control signal B is set to H level, and the control signal C is set to H level.

  With the setting in step 304, the first opening / closing element 21 and the third opening / closing element 27 are turned ON, and rapid power feeding is performed to the electromagnetic solenoid 6. Note that the second switching element 25 is also turned on by the control signal B at this time, but power is not supplied from the second switching element 25 because the first switching element 21 side is at a high potential. In the next step 305, it is determined whether the energization current of the electromagnetic solenoid 6 has reached a predetermined peak current Ia. If it has reached Ia, the process proceeds to step 306, where the control signal A is changed from the logic level H to L, and the control is performed. Signals B and C are maintained at the H level. Accordingly, in this step 306, the first opening / closing element 21 becomes 0FF, the second opening / closing element 25 and the third opening / closing element 27 continue to be ON, and the electromagnetic solenoid 6 continues from the second opening / closing element 25. Power feeding will be performed.

  If the energizing current of the electromagnetic solenoid 6 does not reach the predetermined peak current Ia in step 305, the process returns to step 303 and steps 303 to 305 are repeated, and the energizing current of the electromagnetic solenoid 6 reaches the predetermined peak current Ia. However, the determination in step 303 becomes YES before the determination in step 305 becomes YES due to an abnormality such as an insufficient output voltage of the auxiliary power supply 7 or the inability to conduct the first switching element 21, and the valve is opened. When the drive signal PL2 becomes the logic level L, the routine proceeds to step 307, where the error signal output ER is set. Accordingly, step 303 serves as a rapid power supply abnormality determining means for determining a rapid power supply abnormality, and step 307 serves as a rapid power supply abnormality processing means for performing the processing as described later.

  After the control signal A is changed at step 306, the routine proceeds to step 308, where it is determined whether or not the valve opening drive signal PL2 has changed from the logic level H to L, and if not, the routine returns to step 306. If changed, the process proceeds to step 309, where the control signal A is maintained at the L level and the control signals B and C are changed to the logic level L. After step 307 is completed, the process proceeds to step 309. In step 309, the first opening / closing element 21 continues to be turned off, and the second opening / closing element 25 and the third opening / closing element 27 are also turned off. The exciting current for the electromagnetic solenoid 6 is cut off at high speed. In subsequent step 310, it is determined whether or not the excitation current of the electromagnetic solenoid 6 has become equal to or less than the attenuation determination current Ic. If the excitation current has not decreased to the attenuation determination current Ic, the process returns to step 309 and steps 309 and 310 are repeated. This step 310 serves as attenuation current determination means.

  If the excitation current is equal to or less than the attenuation determination current Ic in step 310 (that is, the attenuation is completed), the process proceeds to step 311 to determine whether or not the valve opening signal PL1 has returned from the logic level H to L. If the valve opening signal PL1 has returned to the logic level L, the routine jumps to step 317, which will be described later. If the valve opening signal PL1 remains at the logic level H, the routine proceeds to step 312 where the excitation current of the electromagnetic solenoid 6 is feedback controlled. The control signal A is maintained at the logic level L, and the control signals B and C are changed to the logic level H. The Note that the control signal C is at the H level when the valve opening signal PL1 is at the logic level H and when the determination at step 310 is YES, but is collectively displayed for convenience.

  As a result, the first opening / closing element 21 continues to open, the second opening / closing element 25 and the third opening / closing element 27 are turned on, and the solenoid solenoid 6 is supplied with valve-opening holding power to generate an exciting current. The lower limit value Ie is set. When the excitation current has not decreased to Ie or less in step 312, and after the processing of step 313 is completed, the process proceeds to step 314, and whether the excitation current of the electromagnetic solenoid 6 has become equal to or greater than Id, which is the upper limit value of feedback control. In step 315, the control signal A maintains the logic level L, the control signal B is set to the logic level L, and the control signal C is set to the logic level H. By this step, the first switching element 21 continues to be opened, the second switching element 25 is opened, the third switching element 27 remains closed, and the excitation current of the electromagnetic solenoid 6 is the effect of the commutation diode 30. It will decrease gently.

  When the exciting current is not equal to or higher than the upper limit Id of feedback control in step 314, and after the processing of step 315 is completed, the process returns to step 311. While the valve opening signal PL1 is at the logic level H in step 311 Steps 312 to 315 surrounded by a dotted line in FIG. 3 are repeatedly executed, and if the valve opening signal PL1 becomes the logic level L in Step 311, the process proceeds to Step 317. 3, that is, step 316 (step 312 to step 315) serves as feedback control means for controlling the valve opening holding current, and the exciting current of the electromagnetic solenoid 6 is held between Ie and Id in FIG. To be controlled.

  Step 317 is performed when it is determined that fuel injection is stopped in Step 301, or when both the valve opening signal PL1 and the valve opening drive signal PL2 remain at the logic level L in Step 302, or in Step 311. When the valve opening signal PL1 changes to the logic level L, all of the control signals A, B, C are set to the logic level L. Accordingly, in this step, all of the first opening / closing element 21, the second opening / closing element 25, and the third opening / closing element 27 are turned off, and the power supply to the electromagnetic solenoid 6 is stopped.

  After step 317 is completed, the process proceeds to step 318, where a power timer (not shown) that outputs a time-up signal at a predetermined time after the key switch 2 is turned on is monitored to determine whether or not a predetermined time has elapsed. This predetermined time is set to a time required for charging the high voltage capacitor 10 of the auxiliary power supply 7 from the initial value 0 V to the maximum voltage when the voltage of the main power supply 1 is Vbmin which is the minimum value, for example. The If the predetermined time has elapsed, the routine proceeds to step 319, where it is determined whether or not the charging voltage of the high voltage capacitor 10 is equal to or higher than the predetermined minimum voltage Vpmin. If the predetermined voltage has been reached, the routine proceeds to step 321. And return to step 300.

  If the predetermined voltage is not reached in step 319, an error signal ER is output in step 320, and the routine is completed. Even when the predetermined time has not elapsed in step 318, the routine is completed in step 321 and the process returns to step 300. In step 321, the logic circuit 17 waits for performing other controls. It returns to step 300 later. The function of this step 319 is an abnormality detecting means for the auxiliary power supply 7, and the step 320 described below functions as an auxiliary power supply abnormality processing means.

  That is, when the error signal ER is set at step 307 or step 320, the CPU 4a advances the output timing of the valve opening signal PL1 or delays the end timing of the valve opening driving signal PL2 to increase the output period of the valve opening driving signal PL2. While operating to extend, the alarm indicator 34 is activated. As a result, even if there is an abnormality in rapid power feeding (such as a short circuit of the first switching element 21) or an abnormality in the auxiliary power supply 7, a sufficient output voltage cannot be obtained, so that the main power supply 1 and the second switching element 25 are prevented from backflowing. Although power is supplied to the electromagnetic solenoid 6 via the diode 28 and a response delay occurs, the fuel injection valve can be operated to perform a retreat operation. When the error signal ER is generated, not only the valve opening drive signal is extended but also the fuel cut signal STP becomes effective by the output of the abnormality storage circuit 33, and the rotation of the internal combustion engine is suppressed, so that the valve opening is sufficient. A driving period can be secured, and the main power source 1 can sufficiently perform the valve opening operation.

  In the first embodiment, the first opening / closing element 21 (rapid power supply circuit using the auxiliary power supply 7) and the second opening / closing element 25 (sustained power supply circuit) are connected in parallel to the electromagnetic solenoid 6. Although the switching element 27 is connected in series with the switching element 27, the third switching element 27 is for high-speed shut-off, and the first switching element 21 and the second switching element 25 are short-circuited and cannot be opened. Even when the third switching element 27 is interrupted, the electromagnetic solenoid 6 can be prevented from being burned out, and since the second switching element 25 does not energize the rapid power feeding, the temperature rise can be suppressed. Since the first switching element 21 cuts off the rapid power feeding period by the current value of the current detection resistor 29, the energization is stopped immediately when the valve opening drive energy is accumulated in the electromagnetic solenoid 6, and the electromagnetic solenoid 6 Suppresses the temperature rise. Further, since both the first opening / closing element 21 and the second opening / closing element 25 are turned on by the valve opening drive signal PL2, energization from the second opening / closing element 25 starts immediately when the first opening / closing element 21 is abnormal. Thus, the valve opening operation can be performed.

Embodiment 2. FIG.
4 to 8 illustrate a fuel injection valve control apparatus according to Embodiment 2 of the present invention. FIG. 4 is a circuit diagram for explaining the overall configuration, and FIGS. 5 and 6 are characteristic diagrams for explaining the operation. FIG. 7 is a block diagram illustrating the configuration of the control operation, FIG. 8 is a flowchart illustrating the operation, and the description of the fuel injection valve control device according to the second embodiment is the same as that of the fuel injection valve control device according to the first embodiment. The difference will be mainly described.

  The CPU 4b in FIG. 4 includes a nonvolatile program memory F-MEM such as a flash memory, an arithmetic processing RAM, and the like, receives information input from the sensor group 5a for detecting the operating state of the internal combustion engine, and stores this input information. The control condition is calculated by the program and the valve opening signal PL1 is output. The nonvolatile program memory F-MEM incorporates a program that serves as a rotational speed control means and a threshold correction means, which will be described later, and the RAM is also used as a fuel pressure abnormality storage means.

  The reset pulse generation open circuit 35 outputs a reset signal RST when the key switch 2 is closed to reset abnormal memory in the CPU 4b and RAM, and the alarm display 45 outputs a fuel signal when an error signal ER described later is output, or fuel The pressure abnormality storage means operates when a fuel pressure abnormality is stored, and the alarm indicator 45 is configured to be driven from the CPU 4b in this embodiment. The amplifier circuit 46 includes a pair of comparison amplifiers 47a and 47b, input resistors 48a and 48b, threshold signal generating means 49a and upper limit threshold generating means 49b, and positive feedback resistors 50a and 50b. The input resistors 48a and 48b are The voltage across the current detection resistor 29 connected in series to the electromagnetic solenoid 6 is input to the positive input terminals of the comparison amplifiers 47 a and 47 b, and the output terminals of the comparison amplifiers 47 a and 47 b are input to the logic circuit 51.

  The threshold signal generator 49a generates a threshold voltage corresponding to the voltage across the current detection resistor 29 when the peak current Ia in FIG. It is set so that the output of the comparison amplifier 47a becomes a logic level H when Ia or higher. Further, once the output of the comparison amplifier 47a becomes the logic level H, the logic level H is maintained until the exciting current of the electromagnetic solenoid 6 becomes equal to or less than the attenuation determination current Ic of FIG. 5C by the action of the positive feedback resistor 50a. Is set to These values are set and changed by the fuel pressure as will be described later.

  Further, the output voltage of the upper limit threshold generation means 49b is the voltage across the voltage generated in the current detection resistor 29 when the upper limit current Id of the valve opening holding current (feedback current) in the valve opening holding period of FIG. When the exciting current of the electromagnetic solenoid 6 becomes equal to or higher than the upper limit current Id, the output of the comparison amplifier 47b is set to the logic level H, and once the output of the comparison amplifier 47b becomes the logic level H. The logic level H is set to be maintained until the exciting current of the electromagnetic solenoid 6 becomes equal to or lower than the lower limit current Ie in FIG. 5C by the action of the positive feedback resistor 50b. Therefore, the comparison amplifier 47b serves as means for detecting the excitation currents Id and Ie. These values are also changed depending on the fuel pressure as will be described later.

  FIG. 6 (a) shows the relationship between the threshold voltage output from the threshold signal generating means 49a and the fuel pressure, and the threshold voltage gradually increases from Ip1 to Ip2 while the fuel pressure increases from MP1 to MP2. In the fuel pressure MP2, the threshold voltage is set so as to increase rapidly to Ip3. The fuel pressure MP3 is an upper limit value of the fuel pressure regulated by the constant pressure relief valve. FIG. 6B shows the relationship between the voltage value of the upper threshold generation means 49b and the fuel pressure. While the fuel pressure increases from MP1 to MP2, the threshold voltage gradually increases from Ih1 to Ih2. In the fuel pressure MP2, the threshold voltage is set so as to increase rapidly to Ih3.

  The approximate calculation formulas of the fuel pressure versus threshold voltage characteristics shown in FIGS. 6A and 6B are built in the nonvolatile program memory F-MEM, and the threshold corresponding to the fuel pressure detected by the fuel pressure sensor. Is calculated by the CPU 4b and output as a comparison input to the comparison amplifiers 47a and 47b from the setting signal outputs SE1 and SE2. Note that the gradual increase from MP1 to MP2 in (a) and (b) of FIG. 6 is replaced by the characteristic of increasing in a multi-stage polygonal line, and the data table is stored in the nonvolatile program memory instead of the approximation calculation. You can also keep it. The gradually increasing portion from MP1 to MP2 corresponds to threshold correction means, and the sudden increase portion in MP2 corresponds to setting changing means.

  The logic circuit 51 generates a valve opening drive signal PL2 shown in FIG. 5 (b) in response to the valve opening signal PL1 from the CPU 4b shown in FIG. 5 (a), and the control signals A, B, C. And an error signal ER is generated. The comparator 16b serves as a rapid power feeding detection means, the input resistor 52 of the comparator 16b applies the output voltage of the first switching element 21 to the negative input terminal, and the input resistor 53 connects the key switch 2. The voltage of the main power supply 1 is applied to the positive input terminal of the comparator 16b. The output of the comparator 16b is given to the gate circuit 13, and the excitation switching element 11 is rendered non-conductive through the gate circuit 13 when the first switching element 21 is ON.

  The second switching element 25b is a bipolar or field effect type power transistor, and the connection of the first switching element 21, the second switching element 25b, and the backflow blocking diode 28b is changed from that in the first embodiment. The first opening / closing element 21 and the second opening / closing element 25b are connected to the electromagnetic solenoid 6 in series. For this reason, when power is quickly supplied from the auxiliary power source 7 to the electromagnetic solenoid 6, the first switching element 21, the second switching element 25b, and the third switching element 27 must all be conducted. When only the switching element 21 is opened, a continuous power supply state is established.

  The time chart shown in FIG. 5 is almost the same as FIG. 2 of the first embodiment, but the valve opening drive signal PL2 shown in FIG. 5B is generated by the logic circuit 51 instead of the CPU 4b. The charge / discharge characteristics of the auxiliary power source 7 shown in (d) are different. That is, the charge / discharge characteristics of the auxiliary power source 7 are such that the boost operation of the auxiliary power source 7 stops and the electromagnetic solenoid 6 is discharged during the rapid power feeding period in which the first switching element 21 is closed, and the rapid power feeding period ends. When the output voltage of the first switching element 21 becomes lower than the voltage of the main power supply 1, the boosting operation of the auxiliary power supply 7 is started immediately. For this reason, the rapid power supply voltage rises quickly, sufficient rapid power supply can be achieved even at high speed, and the boosting operation is stopped for the short circuit abnormality of the first switching element 21 to prevent the electromagnetic solenoid 6 from being burned out. it can.

  As described above, in this embodiment, the first opening / closing element 21, the second opening / closing element 25b, the electromagnetic solenoid 6, and the third opening / closing element 27 are connected in series. Therefore, in the first embodiment, when a short circuit accident occurs in the first switching element 21, the third switching element 27 is opened to prevent the electromagnetic solenoid 6 from being burned. Even if either the element 25b or the third switching element 27 is opened, the electromagnetic solenoid 6 can be prevented from being burned out. In this embodiment, when the first switching element 21 is short-circuited abnormally, the boosting operation of the auxiliary power supply 7 is stopped by the detection of the comparator 16b as described above. The opening operation by the opening / closing element 25b becomes possible simultaneously with the rise of the valve opening signal.

  Next, the control configuration will be described with reference to FIG. In FIG. 7, one of the portions surrounded by a dotted line frame indicates the fuel injection valve control device 100, and the control device 100 includes the accelerator pedal depression degree by the accelerator position sensor 101 and the water temperature sensor 102 as operation information. The cooling water temperature of the internal combustion engine, the intake air amount of the internal combustion engine by the air flow sensor 103, the air / fuel ratio obtained as a result of measuring the exhaust gas component of the air / fuel ratio sensor 104, and the signal that is turned ON / OFF by the rotation of the internal combustion engine by the rotation sensor 105 A signal of a crank angle sensor 106 that detects a rotation angle of the crankshaft is input.

  The signal from the accelerator position sensor 101 and the signal from the water temperature sensor 102 are input to the correction signal generation block 107 to generate a correction signal. The target throttle position generation block 108 detects the detection signal of the accelerator position sensor 101 and the correction signal generation block 107. Is added to the target throttle opening signal. The target throttle opening signal is given to the motor control circuit block 109. The motor control circuit block 109 performs ON / OFF ratio control by, for example, a power transistor, and its output drives opening and closing of the throttle valve of the internal combustion engine. To the motor 110.

  The throttle valve is provided with a throttle position sensor 111 for detecting the throttle valve opening, and the motor control circuit block 109 controls the motor 110 so that the target throttle position generation block 108 and the detected value of the throttle position sensor 111 coincide with each other. Reversible drive. Although the throttle valve is not shown, the throttle valve whose opening degree is controlled by the motor control circuit block 109 is the intake air amount control means.

  A correction signal is generated in a correction signal generation block 112 that inputs a signal from the air-fuel ratio sensor 104, and the correction signal and the signal from the airflow sensor 103 are added to the target injection amount generation block 113 and input to obtain a target fuel injection amount. Is set. The valve opening signal generation block 114 for setting the valve opening timing and the valve opening period generates the valve opening signal PL1 in response to the target injection amount output of the target injection amount generation block 113 and the signal of the crank angle sensor 106, and feed control. The circuit block 115 supplies power to the electromagnetic solenoid 6 in response to the valve opening signal PL1, and drives the fuel injection valve 116. Accordingly, the power supply control circuit block 115 includes the logic circuit 51, the first switching element 21, the second switching element 25b, the third switching element 27, and the like in FIG. The valve opening signal generation block 114 corrects the fuel injection period based on the fuel pressure detected by a fuel pressure sensor 132, which will be described later, and stops the valve opening signal PL1 based on the fuel cut signal STP.

  The rotation speed calculation block 117 calculates the rotation speed of the internal combustion engine from the pulse density of the rotation sensor 105, and the rotation speed limit threshold setting block 118 sets the upper limit rotation speed of the internal combustion engine in the save operation when an abnormality occurs. The outputs of the rotation speed calculation block 117 and the rotation speed limit threshold setting block 118 are given to the comparison amplifier 119. The comparison amplifier 119 inputs and compares the current rotation speed and the rotation speed limit threshold, and for example, the current rotation speed is When the speed exceeds 2000 rpm, a limited rotation signal RPM is output. The abnormality storage unit 120 stores an operation of an abnormality display signal output DER described later. When the abnormality storage unit 120 stores an abnormal state, the intake correction switch 121 and the fuel cut switch 122 are closed and an alarm display is displayed. The device 45 is operated. The abnormality storage means 120 is a part of the arithmetic processing RAM provided in the CPU 4b and also stores the operation of the error signal ER.

  When the intake correction switch 121 is closed, the target throttle opening by the target throttle position generation block 108 is corrected as the current rotation speed calculated by the rotation speed calculation block 117 increases, and the target for the increase in the rotation speed of the internal combustion engine is corrected. The throttle opening is suppressed. That is, as the rotational speed increases, the throttle opening relative to the amount of depression of the accelerator pedal is suppressed, and the intake correction switch 121 functions as an intake amount suppression means. When the fuel cut switch 122 is closed, the limited rotation signal RPM is supplied to the valve opening signal generation block 114 as the fuel cut signal STP, and the generation of the valve opening signal PL1 is stopped. The comparison amplifier 123 compares a current fuel pressure detected by a fuel pressure sensor 132 described later with an upper limit fuel pressure set in the upper limit threshold setting block 124, and generates an abnormality display signal DER.

  The fuel injection valve 116 is supplied with fuel from a fuel supply mechanism 134 shown in the other frame surrounded by a dotted line in FIG. The fuel supply mechanism 134 includes a fuel pump 130 having a piston mechanism driven by an internal combustion engine, an electromagnetic spill valve 131 that adjusts the discharge fuel pressure by correcting the compression timing of the fuel sucked into the fuel pump 130, and a delivery (not shown). The fuel pressure sensor 132 measures the fuel pressure in the pipe, the constant pressure relief valve 133 provided in the delivery pipe (not shown), the delivery pipe (not shown), and the like.

  Further, the control device 100 includes the rotation speed of the internal combustion engine calculated by the rotation speed calculation block 117, the throttle valve opening detected by the throttle position sensor 111, or the accelerator pedal detected by the accelerator position sensor 101. It has a target fuel pressure generation block 125 that sets a target fuel pressure in response to the degree of depression, and a spill valve control circuit block 126. The spill valve control circuit block 126 is set by the target fuel pressure generation block 125. The valve opening period of the electromagnetic spill valve 131 is controlled so that the target fuel pressure and the fuel pressure detected by the fuel pressure sensor 132 are equal. Accordingly, the fuel pressure changes as the rotational speed and the like increase, and sufficient fuel can be supplied even in a short valve opening period.

  The operation of the fuel injection valve control apparatus according to Embodiment 2 of the present invention configured as described above will be described as follows based on FIG. 5 and FIG. In the figure, when the key switch 2 is turned on, the CPU 4b starts to operate and outputs a valve opening signal PL1 shown in FIG. In response to this signal, the logic circuit 51 operates to output a valve opening drive signal PL2 and control signals A to C as shown in FIGS. 5B and 5E. By these signals, the first opening / closing element 21, the second opening / closing element 25b, and the third opening / closing element 27 are ON / OFF controlled, and during the period when the first opening / closing element 21 is OFF, the auxiliary power source 7 The high-voltage capacitor 10 is charged to a predetermined voltage.

  During the rapid power supply period, all of the valve opening signal PL1, the valve opening driving signal PL2, and the control signals A to C are at the logic level H, and the first opening / closing element 21, the second opening / closing element 25b, and the third opening / closing element 27. Are turned on, and the electromagnetic solenoid 6 is rapidly fed from the high voltage capacitor 10 via the first switching element 21, the second switching element 25b, and the third switching element 27, and the fuel injection valve is opened. Valve operation is performed. When the current of the electromagnetic solenoid 6 reaches Ia, the comparison amplifier 47a detects that the logic circuit 51 sets only the control signal A to the logic level L. As a result, the first switching element 21 is turned OFF and the backflow prevention from the main power supply 1 is performed. The electromagnetic solenoid 6 is continuously supplied with power through the diode 28b. In this embodiment, the comparison amplifier 47a is used for detecting the rapid feeding current in order to facilitate control by the fuel pressure.

  In the subsequent valve-opening holding period, the valve-opening drive signal PL2 changes to L level, the control signal B is alternately changed to logic levels H and L by the operation of the comparison amplifier 47b, and the second opening / closing element 25b operates intermittently. As a result, the electromagnetic solenoid 6 is supplied with a valve-opening holding current. The valve opening holding current is set to a current value as small as possible that can be held by the electromagnetic solenoid 6. The fuel supply is ended by the control signal C changing to the logic level L. The predetermined time at the end of the valve opening drive period and the control signal C changing to the logic level L at the end of the valve opening holding period are changed. The three opening / closing elements 27 are turned off to quickly attenuate the excessive attenuation current, or to reduce the delay in the valve closing operation due to the gradually decreasing attenuation current, thereby performing the rapid valve closing operation.

  When the excitation current of the electromagnetic solenoid 6 exceeds Ia shown in FIG. 5C, the output logic level of the comparison amplifier 47a becomes H, and when it becomes Ic or less, it returns to L, but the threshold of the peak current Ia is as shown in FIG. Based on the characteristics shown in (a), the setting signal SE1 of the CPU 4b is written and set in the threshold signal generating means 49a according to the fuel pressure. Further, when the exciting current of the electromagnetic solenoid 6 exceeds the upper limit current Id in FIG. 5C, the output logic level of the comparison amplifier 47b becomes H. When the excitation current becomes lower than the lower limit current Ie, the logic level returns to L. The threshold value of the upper limit current Id is written and set in the upper limit threshold value generating means 49b according to the fuel pressure by the setting signal SE2 of the CPU 4b based on the characteristics shown in FIG. Therefore, the setting signal SE1, the threshold signal generating means 49a, the SE2, and the upper limit threshold generating means 49b serve as setting changing means for changing the setting of the rapid power feeding and the valve opening holding current in accordance with the fuel pressure.

  In this way, the current value peak value Ia of the rapid power feeding and the upper limit value Id of the valve-opening holding current are changed by the signals SE1 and SE2 in accordance with the fuel pressure. While the valve force and the valve opening holding force can be obtained, the rapid feeding current and the valve opening holding current can be reduced while the fuel pressure is low. This is effective for temperature suppression with the element 21.

The fuel injection valve, and hence the electromagnetic solenoid 6 is provided in each cylinder of the plurality of cylinders, and the third opening / closing element 27 is provided individually for each electromagnetic solenoid 6. The second open / close element 25b is shared by a pair of electromagnetic solenoids 6 in which fuel is not continuously injected, and the auxiliary power supply 7 is shared by all the electromagnetic solenoids 6. Accordingly, in the case of a four-cylinder internal combustion engine, four electromagnetic solenoids 6 and three third switching elements 27 are used, and two first switching elements 21 and second switching elements 25b are used. One auxiliary power supply 7 is used.

  The logic circuit 51 individually outputs control signals A, B, and C to each electromagnetic solenoid 6 of the four-cylinder internal combustion engine (for example, A1 to A4, B1 to B4, and C1 to C4). The control signals A1 and A3 are logically summed to A13, and the control signals A2 and A4 are logically summed to A24 to control the pair of first switching elements 21. Similarly, the control signals B1 and B3 are logically summed to B13, and the control signals B2 and B4 are logically summed to B24 to control the pair of second switching elements 25b.

  In the control block diagram of FIG. 7, the motor 110 that drives the throttle valve includes the target throttle opening signal of the target throttle position generation block 108 that responds to the accelerator position sensor 101 and the water temperature sensor 102, and the throttle valve opening by the throttle position sensor 111. Is driven from the motor control circuit block 109 so as to match. The valve opening signal generation block 114 is operated in response to the air flow sensor 103 or the air / fuel ratio sensor 104 to set the target fuel injection amount. The target fuel injection amount commanded from the target injection amount generation block 113 and the crank angle from the crank angle sensor 106 are set. The valve opening signal PL1 is generated based on the signal.

  The pressure of the injected fuel is set by the target fuel pressure generation block 125 and is feedback controlled by the electromagnetic spill valve 131 and the fuel pressure sensor 132, but the fuel injection when the opening timing of the fuel injection valve 116 is constant. The amount is approximately proportional to the square root of the fuel pressure, and if the internal combustion engine has a low rotation speed and a light load, that is, when the throttle valve opening is small, the fuel pressure is lowered to increase the fuel injection valve opening period. In high-speed and high-load operation, control is performed to increase the fuel pressure in order to inject a required amount of fuel within a limited valve opening period. The operation of the power supply control circuit block 115 that responds to the valve opening signal PL1 will be described later with reference to FIG.

  When the fuel pressure by the fuel pressure sensor 132 exceeds MP2 shown in FIG. 6, the comparison amplifier 123 outputs an abnormality display signal DER, the abnormality storage means 120 stores this, and the alarm indicator 45 operates. The abnormality storage unit 120 also stores the operation of the error signal ER. When the abnormality storage unit 120 stores an abnormality as described above, the intake correction switch 121 and the fuel cut switch 122 are closed. When the intake correction switch 121 is closed, the target throttle opening with respect to the rotational speed by the target throttle position generation block 108 is decreased with the increase in the rotational speed of the internal combustion engine calculated by the rotational speed calculation block 117, and the rotational speed of the internal combustion engine is suppressed. To work.

  Since this operation is not a fuel cut, vibration of the internal combustion engine can be prevented, and since it is a low rotation operation as will be described later, the vehicle can travel reliably even when the first switching element 21 is abnormal. However, since the rotational speed of the internal combustion engine cannot be suppressed at a light load such as downhill driving, the comparison amplifier 119 outputs a limited rotational signal RPM when the rotational speed set by the rotational speed limit threshold setting block 118 is exceeded. The fuel cut signal STP is given to the valve opening signal generation block 114 via the fuel cut switch 122 to stop the valve opening signal PL1.

  Next, an operation equivalent to the logic operation of the logic circuit 51 will be described with reference to the flowchart of FIG. 8. Step 800 in FIG. 8 is a step that is periodically activated to start the operation. In step 801, the valve opening signal PL1 is started. Is changed from the logic level L to H. If PL1 is at H level, the routine proceeds to step 802, where the timer Tk for setting the valve opening drive period is started (the valve opening drive signal PL2 is set to H level). At the subsequent step 803, the started timer Tk is set. Determine if time is up. If the timer Tk has not expired, the process proceeds to step 804 where the control signal A, control signal B, and control signal C are set to the logic level H. As a result, the first opening / closing element 21, the second opening / closing element 25 b, and the third opening / closing element 27 are all turned on, and rapid power feeding to the electromagnetic solenoid 6 is started.

  In the next step 805, it is determined whether the excitation current of the electromagnetic solenoid 6 has reached the peak current Ia by monitoring that the output of the comparison amplifier 47a is at the logic level H. If the peak current Ia has not been reached, the process returns to step 803 and repeats up to step 805, waits for the excitation current to reach the peak current Ia, and if the peak current Ia is reached, proceeds to step 806 to set the control signal A to the logic level L. , Control signal B and control signal C continue to be at logic level H. Accordingly, in this step, the first opening / closing element 21 is opened, and the second opening / closing element 25b and the third opening / closing element 27 continue to be ON, and the continuous power supply to the electromagnetic solenoid 6 is performed. In step 805, if the time is up in step 803 before reaching the peak current Ia due to insufficient voltage of the auxiliary power supply 7 or trouble in the first switching element 21, the process proceeds to step 807 and the error signal ER is output. Is done.

  When the process of step 806 is completed, the process proceeds to step 808. In this step, it is determined whether or not the timer Tk started in step 803 has timed up. If the time has not expired, steps 806 and 808 are repeated, If it is up, the process proceeds to step 809 to reset the timer Tk. Even after the error signal ER is output in step 807, the timer Tk is reset in step 809. After resetting the timer Tk, the process proceeds to step 810, the control signal A maintains the logic level L, and the control signal B and the control signal C are changed from the logic level H to L. Therefore, in this step, the first opening / closing element 21 continues to open, the second opening / closing element 25b and the third opening / closing element 27 are also opened, and the exciting current of the electromagnetic solenoid 6 is cut off at high speed.

  In the following step 811, it is determined whether or not the excitation current of the electromagnetic solenoid 6 has become equal to or less than the attenuation determination current value Ic while monitoring whether the output of the comparison amplifier 47a is at the logic level L. Step 811 is repeated, and if it becomes Ic or less, the routine proceeds to Step 812, where it is determined whether or not the logic level of the valve opening signal PL1 has returned from H to L. If the logic level has not returned to L, the process proceeds to the next step 813. Therefore, this step 811 serves as an attenuation current determination means, and the control signal C rises again by the output of the attenuation current determination means, and the third switching element 27 is closed.

  In step 813, it is determined whether or not the output of the comparison amplifier 47b is at the logic level L, and it is determined whether or not the exciting current of the electromagnetic solenoid 6 has become lower than the lower limit value Ie of the feedback control. Then, the control signal A maintains the logic level L, and the control signal B and the control signal C are changed from the L level to the H level. Accordingly, in this step, the first opening / closing element 21 continues to open, the second opening / closing element 25b and the third opening / closing element 27 turn from OFF to ON, and valve-opening holding power supply to the electromagnetic solenoid 6 is started. The current is set to the lower limit value Ie or more. Therefore, the second switching element 25b is reliably turned on and off by one output signal of the comparison amplifier 47b, and the circuit configuration can be simplified. The control signal C is at the H level when the valve opening signal PL1 is at the logic level H and when the determination at step 811 is YES, but is collectively displayed for convenience.

  The following step 815 proceeds after the completion of step 814 and when the excitation current of the electromagnetic solenoid 6 is not less than or equal to the lower limit value Ie of the feedback control in step 813. Here, the output of the comparison amplifier 47b is at the logic level H. Whether or not the excitation current of the electromagnetic solenoid 6 has exceeded the upper limit value Id of the feedback control. If the excitation current is equal to or greater than Id, the process proceeds to step 816, where the control signal A is maintained at L, the control signal B is changed from H to L, and the control signal C is maintained at H, or step 813 is performed. When the excitation current is Ie or more at, the voltage is changed from L to H. By this step, the first opening / closing element 21 continues to be opened, the second opening / closing element 25b is opened, the third opening / closing element 27 is turned on, and the exciting current of the electromagnetic solenoid 6 is gradually attenuated.

  When the excitation current is not equal to or greater than Id in step 815, and after completion of step 816, the process returns to step 812 and the valve opening signal PL1 is at the logic level H, and is surrounded by the dotted line from step 813 to step 816. Step 817 is repeatedly executed to control the exciting current of the electromagnetic solenoid 6 to be maintained in the range from Ie to Id. This step 817 corresponds to the valve opening holding period shown in FIG. 5, and serves as feedback control means related to holding current control.

  The process proceeds to step 818 when the valve opening signal PL1 is at the logic level L at step 801 or when the valve opening signal PL1 changes from the H level to the L level at step 812. All of C become the logic level L, and all of the first opening / closing element 21, the second opening / closing element 25b, and the third opening / closing element 27 are turned OFF, and the power supply to the electromagnetic solenoid 6 is stopped. In the following step 819, the operation of a power supply timer (not shown) that outputs a time-up signal after a predetermined time after the key switch 2 is turned on is monitored to determine whether or not the predetermined time has elapsed. For example, when the voltage of the main power supply 1 is the minimum value Vbmin, the predetermined time is set to a time necessary for charging the high voltage capacitor 10 of the auxiliary power supply 7 from 0 V to the maximum value Vpmax.

  If the predetermined time has elapsed in step 819, the process proceeds to step 820, and it is determined whether, for example, the output voltage of the auxiliary power supply 7 is equal to or higher than a predetermined minimum voltage Vpmin. This determination is performed by monitoring a comparison circuit (not shown) connected to the logic circuit 51. Here, if the determination is NO and the predetermined voltage has not been reached, the process proceeds to step 821 to output the error signal ER and then proceeds to step 822. When the determination at step 819 is NO and when the determination at step 820 is YES, the process proceeds to step 822. This step 822 is an operation end step, and the logic circuit 51 performs other control. After performing the standby for performing, the process returns to the operation start step of Step 800.

  When the error signal ER is set in step 807 or step 821, the CPU 4b advances the output timing of the valve opening signal PL1, or the logic circuit 51 delays the end timing of the valve opening drive signal PL2, thereby opening the valve. The generation period of the signal PL2 is extended and the alarm indicator 45 is operated. The operation in step 803 is a function as a rapid power supply abnormality detection means, the operation in step 820 is a function as an auxiliary power supply abnormality detection means, step 807 is a rapid power supply processing means, and step 821 is an auxiliary power supply abnormality processing means. It has the function as.

  Accordingly, even when the auxiliary power supply 7 becomes abnormal and the voltage does not rise sufficiently, or even when the first switching element 21 is short-circuited and rapid power feeding cannot be performed, the reverse switching diode 28b connects the second switching element 25b. The current from the main power source 1 can be supplied to the electromagnetic solenoid 6 via the power supply, and although the response delay occurs, the fuel injection valve is operated to perform the retreat operation. When an error signal ER is generated in steps 807 and 821, not only the valve opening drive period is extended, but also the fuel cut signal STP at high speed rotation is effective by the output of the abnormality storage means 120 shown in FIG. Since the rotational speed during the internal combustion period is suppressed, a sufficient valve opening time can be ensured.

  As described above, the fuel injection valve control device according to the present invention is a fuel injection valve control device for an internal combustion engine for vehicles, in particular, for driving a fuel injection solenoid valve at high speed in response to fuel pressure discharged from a high-pressure fuel pump. In addition, even if the fuel pressure control means becomes abnormal, fuel injection is possible, and a retreat operation is possible without causing a burning accident. In the case of an internal combustion engine having a throttle valve opening control means by a motor as a save operation means, the throttle valve opening is first suppressed, but at the time of light load operation where the rotation speed cannot be suppressed yet, or the throttle valve by the motor In the case of an internal combustion engine having no opening control means, a fuel cut operation is performed. As the fuel cut operation, it is possible to add control to perform fuel cut only on some cylinders among a plurality of cylinders and perform fuel cut on more cylinders even when rotation cannot be suppressed.

  Further, when the fuel pressure is excessive, the current detection feedback value is changed by the transistor 43 of the amplifier circuit 31 shown in FIG. 1 to increase the peak current Ia and the valve opening holding current Ic, or the threshold value and the upper limit of FIG. The contents of the setting signals SE1 and SE2 for setting the threshold value are rapidly increased like the peak current threshold value IP3 and the holding current threshold value Ih3 in FIG. 6, and the rotational speed of the internal combustion engine is suppressed. Although the average current to the switching element is suppressed and burning is prevented, for example, even when the fuel pressure is normal, the holding current threshold value can be fixed to a large value Ih3. When the value is excessive, the setting of either the peak current threshold value or the holding current upper limit threshold value in the rapid power feeding may be changed. In this case, an unnecessarily large excitation current flows during normal operation at normal fuel pressure, but during normal operation if either the rapid feed current or the valve-opening holding current is reduced, especially when the rapid feed current is reduced. The temperature rise of the electromagnetic solenoid 6 and each opening / closing element can be significantly suppressed.

  In each of the embodiments described above, the description has been given of the save operation when the fuel pressure becomes excessive. However, when the fuel pressure becomes excessive, the fuel injection amount is insufficient and the abnormal rotation of the internal combustion engine does not increase. Therefore, fuel cut control is unnecessary. However, when the throttle valve opening is large and the fuel pressure is too small, it is desirable to operate the alarm storage unit by operating the abnormality storage means. In addition, a watchdog timer can be provided to monitor the CPU runaway, and when a runaway abnormality occurs, the abnormality storage means can be operated to operate the alarm indicator, and intake control and fuel cut operation can be performed.

  The fuel injection valve control device according to the present invention can be applied to a fuel injection device of a diesel engine in addition to an internal combustion engine having a high-pressure fuel pump and a direct injection type gasoline engine.

1 is an overall circuit diagram illustrating a configuration of a fuel injection valve control device according to Embodiment 1 of the present invention. It is a time chart explaining operation | movement of the fuel injection valve control apparatus by Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the fuel injection valve control apparatus by Embodiment 1 of this invention. It is a whole circuit diagram explaining the structure of the fuel injection valve control apparatus by Embodiment 2 of this invention. It is a time chart explaining operation | movement of the fuel injection valve control apparatus by Embodiment 2 of this invention. It is a characteristic view explaining operation | movement of the fuel injection valve control apparatus by Embodiment 2 of this invention. It is a block diagram explaining the control action of the fuel injection valve control apparatus by Embodiment 2 of this invention. It is a flowchart explaining operation | movement of the fuel injection valve control apparatus by Embodiment 2 of this invention.

Explanation of symbols

1 main power supply, 2 key switch, 3 constant voltage power supply,
4a, 4b CPU, 5a sensor group, 5b electric load group,
6 electromagnetic solenoid, 7 auxiliary power supply, 8 induction element,
9 diode, 10 high voltage capacitor, 11 excitation switching element,
12 current detection resistor, 13 gate circuit,
14, 20, 24, 26 Drive resistance, 15 judgment circuit,
16 Inverting logic element, 16a comparator, 17, 51 logic circuit,
18, 22 Base resistance, 19, 23, 43 Drive transistor 21 First switch element, 25, 25b Second switch element,
27 3rd switching element, 28, 28b Backflow prevention diode,
29 current detection resistor, 30 commutation diode, 31 amplifier circuit,
32 A / D converter, 33 Abnormal memory circuit, 34, 45 Alarm indicator,
35 reset signal generation circuit, 36 AND element (rotational speed control means),
37 amplifier, 38 resistance, 39, 40, 41 voltage dividing resistance,
42 side path voltage dividing resistance, 44 driving resistance, 44a open circuit stability resistance,
46 amplifier circuit, 47a, 47b comparison amplifier,
48a, 48b input resistance, 49a threshold signal generating means,
49b Upper threshold generation means, 50a, 50b positive feedback resistance,
100 control device, 101 accelerator position sensor,
102 water temperature sensor, 103 air flow sensor,
104 air-fuel ratio sensor, 105 rotation sensor,
106 crank angle sensor, 107 correction signal generation block,
108 Target throttle position generation block,
109 Motor control circuit block, 110 Motor,
111 throttle position sensor (intake air amount control means),
112 correction signal generation block, 113 target injection amount generation block,
114 valve opening signal generation block, 115 power supply control circuit block,
116 fuel injection valve, 117 rotation speed calculation block,
118 Rotational speed limit threshold setting block,
119, 123 Comparative amplifier, 120 Abnormal storage means,
121 Intake correction switch, 122 Fuel cut switch,
124 upper threshold setting block, 125 target fuel pressure generation block,
126 Spill valve control circuit block, 130 Fuel pump,
131 Electromagnetic spill valve, 132 Fuel pressure sensor,
133 Constant pressure relief valve, 134 Fuel supply mechanism.

Claims (17)

A valve opening signal generating means for calculating a fuel supply amount to the fuel injection valve based on an operating state of the internal combustion engine and outputting a valve opening signal for setting a valve opening period, and boosting a voltage from a main power supply mounted on the vehicle An auxiliary power source that outputs a high voltage, a first opening / closing element that rapidly supplies power from the auxiliary power source to the electromagnetic solenoid of the fuel injection valve at the valve opening timing by a signal of the valve opening signal generating means, and following the rapid power supply, A second opening / closing operation that continuously supplies power to the electromagnetic solenoid with a voltage from a main power source and supplies the electromagnetic solenoid with a feedback-controlled valve opening holding current necessary for holding the valve open during the valve opening period after the continuous power supply. Elements, intake air amount control means for controlling the intake air amount of the internal combustion engine, fuel pressure detection means for detecting the pressure of the fuel supplied to the fuel injection valve, and the output voltage of the auxiliary power source reaches a predetermined value within a predetermined time. Not Auxiliary power source abnormality detecting means for detecting comprises an auxiliary power supply abnormality processing unit that operates when the auxiliary power source abnormality detection means detects an abnormality, the rapid power feed to a change in detected by the fuel pressure in the fuel pressure detecting means by current value of the change at least one of the current value of the current value of the valve opening holding, by changing at least one of the valve opening force and the valve opening holding force, detected by the fuel pressure before the SL fuel pressure detecting means Is greater than or equal to a predetermined value and the rotational speed of the internal combustion engine is greater than or equal to a predetermined value, at least one of the fuel supply amount and the intake air amount is suppressed and the auxiliary power source abnormality processing means detects the auxiliary power source abnormality. the signal means, or delays the end timing of the valve-opening drive signal, or to, characterized in that delaying the completion timing of the valve-opening drive signal by advancing the output timing of the valve open signal The fuel injection valve control device. A valve opening signal generating means for calculating a fuel supply amount to the fuel injection valve based on an operating state of the internal combustion engine and outputting a valve opening signal for setting a valve opening period, and boosting a voltage from a main power supply mounted on the vehicle An auxiliary power source that outputs a high voltage, a first opening / closing element that rapidly supplies power from the auxiliary power source to the electromagnetic solenoid of the fuel injection valve at the valve opening timing by a signal of the valve opening signal generating means, and following the rapid power supply, A second opening / closing operation that continuously supplies power to the electromagnetic solenoid with a voltage from a main power source and supplies the electromagnetic solenoid with a feedback-controlled valve opening holding current necessary for holding the valve open during the valve opening period after the continuous power supply. A predetermined amount of time after the first switching element is turned on, an element, an intake air amount controlling means for controlling the intake air amount of the internal combustion engine, a fuel pressure detecting means for detecting the pressure of fuel supplied to the fuel injection valve, Even the sudden Rapid power supply abnormality detection means for detecting that the current value of the power supply does not reach a predetermined value, and rapid power supply abnormality processing means that operates when the rapid power supply abnormality detection means detects abnormality, the detection of the fuel pressure detection means By changing at least one of the current value of the rapid power feeding and the current value of the valve opening holding in response to a change in the fuel pressure, at least one of the valve opening force and the valve opening holding force is changed, When the fuel pressure detected by the fuel pressure detecting means is equal to or higher than a predetermined value and the rotational speed of the internal combustion engine is equal to or higher than a predetermined value, at least one of the fuel supply amount and the intake air amount is controlled to be suppressed and the rapid power feeding is performed. The abnormality processing means delays the end timing of the valve opening drive signal by the signal of the rapid power supply abnormality detection means, or outputs the valve opening signal output timing by the valve opening signal generating means. The fuel injection valve control apparatus characterized by delaying the end time of Umate the valve-opening drive signal. Fuel pressure abnormality storage means for storing that the fuel pressure has deviated from a predetermined control range is provided. While the fuel pressure abnormality storage means stores an abnormality, an alarm is displayed and the fuel pressure abnormality storage is performed. The fuel injection valve control device according to claim 1 or 2 , wherein the means is capable of resetting the memory by a driver's operation such as re-insertion of a key switch. The fuel圧異normal storage means stores the abnormality, when the rotational speed of the internal combustion engine exceeds a predetermined value, according to claim 3, wherein the power supply to the electromagnetic solenoid of the fuel injection valve, characterized in that it is stopped Fuel injection valve control device. An intake air amount control unit that controls the intake air amount in accordance with an operation amount of the accelerator; and an intake air amount suppression unit that suppresses the intake air amount. The intake air amount suppression unit has an abnormality in the fuel pressure abnormality storage unit. operates when storing the any one of claims 3 or claim 4, characterized in that to suppress the increase of the intake with respect to the increase in the accelerator operation amount with increasing rotational speed of the internal combustion engine The fuel injection valve control device according to the item. The auxiliary power source includes a booster circuit composed of an inductive element and an excitation switching element, and a capacitor charged by the booster circuit. The booster circuit is in the period of the rapid power feeding or the period of the rapid power feeding and the continuous power feeding. The fuel injection valve control device according to any one of claims 3 to 5 , wherein the boosting operation is stopped. The auxiliary power source includes a booster circuit composed of an inductive element and an excitation switching element and a capacitor charged by the booster circuit, and stops the boosting operation of the booster circuit when the charging voltage of the capacitor reaches a predetermined value. In addition, the output voltage of the first switching element is compared with the voltage of the main power supply, and when the output voltage of the first switching element is higher than the voltage of the main power supply, the boosting operation of the booster circuit is stopped. The fuel injection valve control device according to any one of claims 3 to 5 , wherein: The first opening / closing element and the second opening / closing element are connected in parallel to the electromagnetic solenoid, and a third opening / closing element having a high-speed cutoff function is connected in series with these, A diode for preventing backflow is connected in series to the second switching element, and the first switching element and the second switching element are both conducted during the rapid power feeding, and the first switching element during the continuous feeding. The fuel injection valve control device according to any one of claims 3 to 7 , wherein only the fuel cell is configured to be non-conductive. The first switching element, the second switching element, and the third switching element are connected in series to the electromagnetic solenoid, and a connection point between the first switching element and the second switching element. Is connected to the main power source, and the first switching element and the second switching element are both electrically connected during the rapid power feeding and the first switching element during the continuous power feeding. The fuel injection valve control device according to any one of claims 3 to 7 , wherein only the open / close element is configured to be non-conductive. A commutation diode that forms a return circuit is connected to the series circuit of the electromagnetic solenoid and the third switching element, and the third switching element has a withstand voltage limiting characteristic higher than the maximum output voltage of the auxiliary power supply. The fuel injection valve control device according to any one of claims 3 to 9 , further comprising: Current detecting means for detecting that the energization current during the rapid power supply exceeds a predetermined threshold and outputting a determination signal is provided, and the first opening / closing element is turned on by the valve opening signal and the rapid power supply The fuel injection valve control device according to any one of claims 3 to 10 , wherein the quick power feeding is stopped by a signal from the current detection means. And a threshold value correcting means for correcting the threshold value of the energization current at the time of rapid power feeding corresponding to the fuel pressure when the fuel pressure detected by the fuel pressure detecting means is within a predetermined control range. 12. The fuel injection valve control device according to claim 11 , wherein a threshold voltage for stopping the rapid power feeding is lowered with a drop in fuel pressure. It has valve opening drive signal output means that rises simultaneously with the valve opening signal and outputs a valve opening drive signal during a period until the fuel injection valve completes the valve opening operation, and the second opening / closing element is opened. was closed with said first switching element during the valve drive signal output period, the first switching element after the closing, characterized in that said second switching element performs the continuous power feed to the electromagnetic solenoid according The fuel injection valve control device according to any one of claims 3 to 12 . Attenuating current determination means for detecting that the energization current of the electromagnetic solenoid is attenuated to a predetermined value after the second opening / closing element is opened upon completion of the valve opening drive signal and outputting a determination signal. 14. The fuel injection valve control device according to claim 13 , wherein the third opening / closing element is temporarily opened upon completion of the valve opening drive signal and is closed again by the determination signal. . After the second opening / closing element is opened along with the end of the valve opening drive signal, the energization current of the electromagnetic solenoid is attenuated to the holding current lower limit value which is the lowest current value at which the fuel injection valve can be opened. Current value detecting means for detecting the current value detecting means for detecting a holding current upper limit value larger than the minimum current value by a predetermined value, and the second opening and closing element, during the continuation of the valve opening signal, was closed by the detection signal of the holding current lower limit, open to the fuel injection according to claim 13 or claim 14, characterized by being configured to repeat the opening and closing operation by the detection signal of the holding current upper limit value Valve control device. The current value detecting means for detecting the holding current lower limit value and the current value detecting means for detecting the holding current upper limit value are composed of one comparison amplifier, and this comparison amplifier has an energization current of the electromagnetic solenoid. The fuel injection valve control device according to claim 15 , wherein an operation signal is output when the holding current upper limit value is exceeded, and the operation is restored at the holding current lower limit value. Threshold correction means for correcting the holding current upper limit value or the holding current lower limit value corresponding to the fuel pressure when the fuel pressure detected by the fuel pressure detection means is within a predetermined control range is provided. The fuel injection valve according to claim 16 , wherein the output of the correcting means is supplied to a comparison amplifier, and the threshold correcting means decreases the holding current upper limit value or the holding current lower limit value as the fuel pressure decreases. Control device.

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