JPS6330492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric governor for an internal combustion engine, which controls the fuel regulating member of a fuel injection pump of an internal combustion engine, particularly a diesel engine, using electric servo means. The present invention relates to an electric governor for an internal combustion engine that can automatically warm up the engine by controlling the fuel injection amount according to the engine cooling water temperature when the engine is warmed up when the engine is cold.

For fuel injection pumps equipped with conventional engine-type governors, as a means of warm-up operation when the engine is cold,
For example, there are those that manually increase the amount of warm-up by pulling the accelerator lever with a wire, and those that lead cooling water to an injection pump and have it act on the thermowax, and use the expansion of this thermowax to operate the accelerator lever to increase the amount of warm-up. It was hot.

However, among the conventional methods that manually operate the accelerator lever, the degree of increase depends entirely on the driver's feeling, and furthermore, the driver must manually operate the accelerator lever each time the driver warms up the vehicle. The point was hot. In addition, in those that use thermowaxes, the cooling water piping must be routed to the injection pump, which complicates engine installation, and furthermore, it is very labor-intensive to adjust to the necessary minimum warm-up increase characteristics. It was hot.

In view of these circumstances, the present invention calculates the error between the actual injection amount and the target injection amount of the injection pump using an electric control circuit using operating conditions from an operating condition detector such as engine speed and accelerator operation amount as input signals. and operating the fuel adjustment member of the fuel injection pump via electric servo means based on the result, and detecting the engine cooling water temperature as an electric signal;
By correcting the accelerator operation amount itself in accordance with this temperature signal and calculating the target injection amount, the cooling water temperature correction of the injection amount is always indirectly performed along the governor pattern as shown in Fig. 21. It is an object of the present invention to provide an electric governor for an internal combustion engine that can prevent the target injection amount from exceeding the maximum injection amount set in the governor pattern through this correction, and can perform good warm-up operation control.

First, FIG. 27 is a diagram showing the overall configuration of the present invention, in which A is an electric servo means for operating the fuel adjustment member of the fuel injection pump B for an internal combustion engine, D and E are the rotational speed of the internal combustion engine C, and an accelerator pedal. A rotation speed detection means and an accelerator operation amount detection means that detect the operation amount as an electric signal, F is an actual injection amount detector that generates an actual injection amount signal according to the fuel injection amount of the fuel injection pump B, and G is an internal combustion engine. H is an accelerator operation amount correction that corrects the accelerator operation amount to a predetermined accelerator operation amount larger than the actual accelerator operation amount based on the temperature signal from the cooling water temperature detection means G. means, I is a target injection amount calculation means for calculating a target injection amount of the injection pump according to the corrected accelerator operation amount and rotation speed;
K is an error correction means for comparing the actual injection amount and the target injection amount and operating the electric servo means A in a direction to correct the error between the two injection amounts.

The case where the present invention is applied to an internal combustion engine equipped with a distributed fuel injection pump will be described below. FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 denotes an operating condition detector that detects operating conditions of the engine 6 (diesel engine in this embodiment) as an electric signal, and is composed of an accelerator operation amount detector 1a, an engine rotation speed detector 1b, and a cooling water temperature detector 1c. There is. 2
is an electric control circuit that inputs the accelerator operation amount signal, rotation speed signal, and cooling water temperature signal from the operating condition detector 1 and calculates a target injection amount signal corresponding to the target internal combustion engine injection amount to be injected into the engine 6. At the same time, the actual injection amount signal corresponding to the actually injected fuel amount detected by the actual injection amount detector 7 is input, and the actual fuel injection amount and target are determined from the target injection amount signal and the actual injection amount signal. The electromagnetic actuator 3 serving as an electric servo means is driven so as to correct the error between the fuel injection amount and the fuel injection amount. Electromagnetic actuator 3 moves fuel adjustment member 4 in response to signals from electric control circuit 2 . The fuel amount adjusting member 4 is a spill ring, and the fuel injection pump 5 is a bottle type distribution fuel injection pump. The actual injection amount detector 7 detects the position of the fuel adjustment member 4 that adjusts the amount of fuel actually injected into the engine 6 from the fuel injection pump 5, and in this embodiment, a variable inductance type position sensor is used. There is.

FIG. 2 shows the structure of a variable inductance type position sensor, in which a primary coil 12 and a secondary coil 11 are wound around a hollow bobbin 13. A core 14 is inserted into the hollow part. Primary coil 1
When an excitation signal with a constant amplitude and a constant frequency is applied to the sensor 2, if the secondary coil 11 of the sensor is terminated with a resistor, a voltage will be generated across the resistor. Now, assuming that the length of the portion where the core 14 inserted into the hollow part overlaps with the secondary coil 11 is l, the relationship between the voltage Vpp generated at both ends of the secondary coil and l is shown in Figure 3. becomes. In this embodiment, the straight line portion of this characteristic is used as the position signal.

FIG. 4 shows the structure of the electromagnetic actuator 3 as an electric servo means. The electromagnetic actuator 3 includes a coil 31, a core 32 that holds the coil and forms a magnetic circuit, a moving core 33 that is a movable part, a connecting rod 34 that is directly connected to the moving core 33, and a spring 35. The moving core 33 and the connecting rod 34 are movable in both directions a and b. The moving core 33 is the coil 3
The electromagnetic actuator stops when the force in the direction of the arrow a generated by the current flowing through the electromagnetic actuator is balanced with the restoring force in the direction of the arrow b generated by the spring 35 attached inside the electromagnetic actuator. FIG. 5 shows the relationship between the current flowing through the coil 31, the length m of the gap between the core 32 and the moving core 33, and the force generated by the current in the direction of arrow a. In FIG. 5, the dashed line indicates the force generated by the spring 35 in the direction of arrow b. As can be seen from this figure, in order to control the position of the electromagnetic actuator in this embodiment, it is sufficient to control the current flowing through the coil 31.

FIG. 6 is a sectional view of the essential parts of a bottle-type distribution fuel injection pump to which the device of the present invention is applied. 6 is a 4-cycle diesel engine, 5 is a fuel injection pump, and 41 is a pump drive shaft. In a 4-stroke engine, a vane type pump driven at 1/2 of the crankshaft rotation speed is used, and the fuel filter is connected to the fuel tank 62. 63 is sucked in from the inlet 43 and discharged to the outlet 44. The fuel that has exited the outlet 44 fills a fuel reservoir 45 within the pump housing, the pressure of which is regulated by a fuel pressure regulator 46, and excess fuel is returned to the fuel tank 62. The face cam 47 and the pump plunger 48 are integrated, and are connected to the pump drive shaft 41 by a coupling ring 49 to transmit rotational force. This Facecam 47
The roller 5 is moved by the plunger spring 50.
1, the pump drive shaft 41
As the plunger 48 rotates, the plunger 48 performs reciprocating motion and rotational motion, sucks in fuel from the suction port 52, and then distributes and pressure-feeds the fuel. Fuel is pumped by plunger 4
8 moves in the direction of arrow b and closes the suction port 52, and exits the distribution passage 53 and delivery valve 54 and is injected from the injection nozzle into each cylinder of the engine via a high-pressure pipe (not shown). When the plunger 48 further moves in the direction of the arrow b and the spill port 55 is opened to the fuel reservoir 45 from the right (b direction side) end surface of the spill ring 4 forming the fuel adjustment member, the pumping of fuel ends. Therefore, by moving the spill ring 4 in the axial direction of the plunger 48, the fuel injection amount can be adjusted.

The electromagnetic actuator 3 is operated by a force in the direction of arrow a generated by a current flowing through a coil 31 and a spring 35.
The position of the moving core 33 is determined by balancing the force in the direction of the arrow b generated by the force. This moving core 33 moves the spill ring 4 via a connecting rod 34 and a link mechanism 38 to adjust the fuel injection amount. 1b is a rotation speed detector that detects the rotation speed of the engine, and an electromagnetic pickup 1b2 detects the rotation speed of a gear 1b1 directly connected to the pump drive shaft 41.
This electric signal is input to the electric control circuit 2 as an engine rotation speed signal. Reference numeral 1a denotes an accelerator operation amount detector using, for example, a potentiometer, and inputs an electric signal corresponding to the accelerator operation amount to the electric control circuit 2. Reference numeral 1c denotes a cooling water temperature detector, which uses a thermistor type thermometer, and inputs changes in resistance as a voltage signal to the electric control circuit 2. 7
1 is a key switch that detects battery voltage and whether the starter is ON or OFF.

The electric control circuit 2 receives detection signals from the engine rotational speed detector 1b, accelerator operation amount detector 1a, and cooling water temperature detector 1c, and calculates a target injection amount signal corresponding to the target injection amount of the fuel injection pump. This signal is compared with the actual injection amount signal from the actual injection amount detector 7, and based on these errors, a signal is given to the electromagnetic actuator 3 to drive the electromagnetic actuator 3 so as to correct the error. In this embodiment, calculation of this target injection amount is performed by a microcomputer.

FIG. 7 shows the configuration of the electric control circuit 2.
The electric control circuit 2 includes a microcomputer section 2a that calculates a target injection amount signal based on the signal from the operating condition detector 1, and a microcomputer section 2a that calculates the target injection amount signal based on the signal from the operating condition detector 1, and a signal from the actual injection amount detector 7 and the target injection amount signal calculated thereby. and an electromagnetic actuator servo circuit 2b that drives the electromagnetic actuator 3 to correct this error using the error between these two signals, a waveform shaping circuit 2c, amplifier circuits 2d and 2e, and a detection circuit. It consists of a circuit 2f and an oscillation drive circuit 2g.

FIG. 8 is a detailed configuration diagram of the microcomputer section 2a. 80 is a central processing unit (CPU) that calculates the target injection amount, and uses an 8-bit configuration. 81 is a read-only memory unit (ROM) that stores control programs and control constants, 82 is an arithmetic operation unit (APU) that executes multiplication and division using hardware, and 83 is a read-only memory unit (ROM) that stores control programs and control constants.
A temporary storage unit (RAM) is shown which is used for temporary storage of control data while the CPU 80 is operating according to a control program. 84 is an interrupt control unit that controls interrupts to the CPU 80;
Notifies the CPU of the occurrence of an interrupt. The interrupt factor in this embodiment is an interrupt caused by a rotational speed pulse generated from the output of the engine rotational speed detector 1b. 85 is a rotation speed signal detection section;
A function is provided to input a numerical value inversely proportional to the engine speed into the CPU 80 by counting the pulse width of the pulse signal generated by the engine speed detector 1b and shaped into a waveform using a clock signal generated by the CPU. It is something that we have. Digital input port 86 is a port used for inputting logic signals, and when the starter switch is turned on when starting the engine.
The signal from the starter switch is waveform-shaped by the waveform shaping circuit 2c and then input. The analog input port 87 is a port used to input analog signals, and performs analog-to-digital (A/D) conversion of the accelerator operation amount signal and the cooling water temperature signal. 88 is an analog output port that converts the target injection amount calculated by the CPU 80 into an analog voltage, and this circuit converts the target injection amount Qf into a target injection amount command voltage Vs. 8
A digital output port 9 outputs a switch signal from the CPU 80 to the outside, and the CPU 80 resets the flip-flop and counter in the rotational speed signal detector 85 through this circuit.

FIG. 9 shows the detailed contents of the rotation speed signal detection section 85 and the interrupt control section 84, and the 10th
The figure shows the signal waveform at each point in FIG. 1b1 is a gear directly connected to the pump drive shaft 41 of the distribution type fuel injection pump, 1b2 is an electromagnetic pickup that detects the unevenness of the teeth of gear 1b1, and the output waveform of the a terminal is shown in FIG. 10a. 851 is a circuit for waveform shaping the signal generated by the electromagnetic pickup, and this circuit converts the signal into a pulse signal that can be easily handled by a digital circuit as shown in FIG. 10b, and outputs it from the b terminal. 852 is a frequency dividing circuit which divides the output signal of 851 into two and outputs it from the c terminal as shown in FIG. 10c. 853 is an inverter and a frequency dividing circuit that inverts the polarity of the pulse signal input to the h terminal. 854 is a counter section for calculating the number of pulses of the pulse signal inputted from the d terminal and shown in FIG. 10d, and has 16-bit outputs e1 to e16. The interrupt control unit 84 connects the signal of the c terminal and the frequency dividing circuit 85.
An interrupt signal to the CPU 80 is generated from the pulse signal No. 3 to the terminal f. A flip-flop preset signal is input to terminal g.

FIG. 11 shows an amplifier circuit 2d that amplifies the signal from the accelerator operation amount detector 1a and converts it into a signal voltage that is easy to handle by the microcomputer section. 1
11 is a circuit that moves the level of the signal from the detector 1a up and down, and 112 is an amplifier section that can freely set the gain of the circuit. This amplifier circuit allows the signal voltage corresponding to the accelerator operation amount to be arbitrarily determined. The output signal of the l terminal is input to the analog input port 87.

Figure 12 shows ST (starter) from the key switch.
This is a waveform shaping circuit 2c that processes the signal and inputs it to the digital input port 86. 121 is a transistor for converting the level of the signal from the key switch, and 122 is a Schmitt trigger for shaping the pulse waveform.

FIG. 13 shows an amplifier circuit 2e that amplifies the water temperature signal from the cooling water temperature detector 1c and converts it into a signal voltage that can be easily processed by the microcomputer 2a. A thermistor is used as the cooling water temperature detector 1c, and its resistance value increases as the cooling water temperature decreases. 126 is a circuit for adjusting the level of the signal from the cooling water temperature detector 1c, and 127 is a circuit for adjusting the level of the signal from the cooling water temperature detector 1c.
This is an amplification section that converts the voltage signal into a voltage signal range that can be processed by a, and these circuits 126 and 127 obtain the cooling water temperature signal Tw and output it to the analog input port 87.

FIG. 14 shows circuits related to the actual injection amount detector 7, that is, the detection circuit 2f and the oscillation drive circuit 2g.
In this figure, 131 to 135 constitute oscillation drive circuits, and 136 to 139 constitute detection circuits. A constant voltage section 131 is a circuit for supplying a constant offset voltage to each amplification stage, and is composed of a resistive voltage divider circuit and a buffer amplifier. 132,133
1 is a quadrature oscillation circuit, 134 is a buffer amplifier, and 135 is a current amplifier. Note that 132 is an oscillation section of a quadrature oscillation circuit, and 133 is an amplitude limiting circuit that limits the amplitude of the oscillation waveform of the oscillator. The detection circuit includes a capacitor 136 that cuts DC, a full-wave rectifier circuit 137, and an integrating circuit 138.
and a differential amplifier circuit 139. The output signal Vp of the differential amplifier circuit 139 is input to the electromagnetic actuator servo circuit 2b. The electromagnetic actuator servo circuit 2b drives the electromagnetic actuator 3 so as to correct an error between the target injection amount command voltage Vs calculated by the microcomputer section 2a and the signal Vp from the detection circuit 2f. It is.

FIG. 15 is a circuit diagram of the electromagnetic actuator servo circuit. The target injection amount command voltage Vs, which is the output of the microcomputer section 2a, is applied to the terminal 23a,
23b. The output voltage of the buffer amplifier stage 231 becomes -Vs. 232 is an amplification stage;
The gain K ₂ can be adjusted by the variable resistor 241, and the offset voltage Vb ₂ can be adjusted by the variable resistor 241.
Adjustment is possible by 2. The output voltage of the amplification stage 232 is K ₂ ×Vs+Vb ₂ . Block 233
is a voltage follower block to which the position signal Vp is input from terminals 23c and 23d. The output voltage of block 233 is the same as the input voltage, Vp. Amplification stage 234 provides an offset voltage of Vb ₃ to the input signal. Therefore, the output voltage is −Vp
+Vb ₃ . The amplification stage 235 amplifies the difference voltage between the output voltage of the amplification stage 232 and the output voltage of the amplification stage 234, and the gain is variable by the variable resistor 243. The output voltage V ₂₃₅ of the amplification stage 235 has a gain of K ₄ ,
If the offset voltage is Vb ₄ , then V ₂₃₅ = K ₄ ×
( _K2Vs +Vp+ _Vb2 - _Vb3 )+ _Vb4 . 245
is a resistor for detecting the value of the current flowing through the coil 31 of the electromagnetic actuator 3, and a voltage proportional to the current is generated across the resistor. Amplification stage 236
is a portion that amplifies the voltage generated across this resistor, and its gain is determined by the variable resistor 246.
Comparison stage 237 compares the output voltages of amplification stage 235 and amplification stage 236, and controls transistor 247. With this circuit, the current flowing through the coil 31 of the electromagnetic actuator is on average proportional to V ₂₃₅ .

Figure 16 shows the injection amount Q and target injection amount command voltage Vs.
FIG. 17 shows the relationship between the injection amount Q and the actual injection amount signal (position signal) Vp. Because of the relationships shown in these figures, a negative feedback is formed for the injection amount by summing Vs and Vp. The reason why the relationship between the actual injection amount signal Vp and the injection amount Q is set as shown in FIG. 17 is to prevent the engine from overspeeding if the sensor ceases to output an output signal due to disconnection or the like. Current detection resistor 245, amplification stage 236
The reason why the current flowing through the coil 31 of the electromagnetic actuator 3 is converted into voltage and fed back is because the battery voltage is directly supplied to the coil 31 of the actuator 3, and the purpose is to correct this voltage fluctuation. This is for the two purposes of correcting changes in the resistance of the coil 31 due to self-heating and changes in the thermal environment.

Next, the operation of the above structure will be explained with reference to flowcharts and characteristic diagrams shown in FIGS. 18 to 26. FIG. 18 is a flowchart showing arithmetic processing procedures for performing governor control of the fuel injection pump 5. Fig. 19 schematically shows a map for determining the target injection amount from the rotational speed and accelerator operation amount used in the basic injection amount calculation step in Fig. 18, and Fig. 20 shows a flowchart for searching the map data in Fig. 19. show. Fig. 21 is a characteristic diagram (governor pattern) showing the relationship between rotation speed, injection amount, and accelerator operation amount, and Fig. 22 is a map for converting the cooling water temperature signal used in the warm-up increase calculation step in Fig. 18 to temperature. The schematic diagram, Figure 23, is a detailed flowchart of the warm-up increase calculation step in Figure 18, and Figure 24.
The figure is a characteristic diagram showing the relationship between engine speed, injection amount, and spill ring position, and Figure 25 is a schematic diagram of the map used to calculate the command value from the engine speed and target injection amount used in the target injection command value calculation step in Figure 18. 26 is a flowchart for searching the map data shown in FIG. 25.

Now, in an internal combustion engine equipped with this electric governor,
When the key switch is turned on at the start of operation, a stabilized voltage is supplied from a stabilized power supply circuit (not shown) to the components of this device, and each component becomes operational. Then, in the microcomputer section 2a, an initialization step is performed upon the start of its operation.
At step 150, registers, counters, latches, etc. in the microcomputer section 2a are set to initial states necessary for starting arithmetic processing. This initial state setting operation includes releasing the starter signal flag, which will be described later, and sending a reset signal to the counter of the rotational speed signal detection section 85 and the latch. After this initial setting, the next starter signal judgment step 151
Proceed to. In starter signal determination step 151, when the key switch is turned on to the starter side,
A starter signal is generated at terminal ST in FIG.
Then, the signal whose waveform has been shaped by the waveform shaping circuit 2c is taken in through the digital input port 86 of the microcomputer section 2a, and when the starter signal flag is set, the determination becomes YES and the process proceeds to the next operating condition input step 152. Also, if the key switch is in the ON state and is not turned to the starter position, the starter signal will not be generated, so the starter signal flag will remain in the reset state and the determination will be NO, and the program will not proceed to the step and will wait in that state. state. Exercise condition input step
152, a signal from the electromagnetic pickup 1b2 as a rotational speed sensor is converted into a pulse number inversely proportional to the rotational speed by an engine rotational speed signal detector 85, and an interrupt signal synchronized with the rotation is used to control the microcomputer section 2a. It is stored at a predetermined address in RAM 83. Further, the accelerator operation amount signal θ is detected by a potentiometer serving as an accelerator operation amount signal detector 1a, and this voltage signal proportional to the accelerator operation amount is amplified by an amplifier 73, and the output signal is input to the analog input. It is converted into the number of pulses by the A/D converter of port 87, and is stored in RAM8.
It is stored at a different address from the rotation speed signal No. 3.

Further, the engine cooling water temperature signal Tw is detected by a thermistor type temperature sensor serving as the cooling water temperature detector 1c, and a voltage signal inversely proportional to this cooling water temperature is amplified by the amplifier 76, and its output is output from the analog input port 87. /Converted to number of pulses by D converter
The rotation speed signal and the accelerator operation amount signal are stored in the RAM 83 at a different address. When data input is completed in step 152, the process proceeds to step 153. This step 153 is a cooling water temperature linearization step, and since the resistance value of the thermistor serving as the cooling water temperature detector 1c increases exponentially as the temperature decreases, the temperature signal Tw also exhibits the same characteristics. Therefore, in step 154, the temperature data is converted to be proportional to the cooling water temperature, and the method is described in the 22nd section.
As shown in the figure, a map of the temperature data to be converted is created and the map is searched. Now, let the temperature signal be Twx, and Twa>Twx>Twb
Suppose that there is a relationship between However, since the voltage value of Twx decreases as the cooling water temperature rises, there is an inequality relationship as described above. Further, when the temperature at point Twa is Ta and the temperature at Twb is Tb, it is determined by Tx=Twa-Twx/Twa-Twb×(Tb-Ta)+Ta. However, the map data is stored in the relationship Tb>Ta, and Tn is the highest temperature. In the above manner, temperature data Tx proportional to the cooling water temperature is obtained.

Next, step 154 is a cooling water temperature determination step, in which the cooling water temperature data Tx obtained in step 153 is determined to be larger than the set temperature Ts, and if Tx>Ts, it is determined that the warm-up operation has been completed. step 156
Jumps to the basic injection amount calculation step, and also Ts
>Tx, that is, when the engine is cold, the process proceeds to the next warm-up increase calculation step 155.

In the warm-up increase calculation step 155, the accelerator operation amount θ is increased or decreased in accordance with the difference between the step set temperature Ts and the actually measured temperature Tx for correcting the cooling water temperature. FIG. 23 shows a flowchart of the warm-up increase calculation step. The accelerator operation amount θ is corrected with respect to the idle position θ ₁ using the following formula.

θx = θ ₁ + K _A (Ts - Tx) Here, K _A is a constant that determines the accelerator operation amount correction ratio, and the correction amount is the set temperature Ts and the actual measured temperature.
The larger the difference from Tx, the larger it becomes. The above processing is performed in step 250. Next, in step 251, the actual θ is compared with the correction value θx, and if θ>θx, the actual accelerator operation amount θ is stored as data in a fixed manner in step 252, and the process proceeds to the next step 156. Also θ<
If θx, replace θ=θx in step 253, temporarily store the value of θx, and proceed to the next step 156.
Proceed to.

Next, in the basic injection amount calculation step 156,
The target injection amount Qf for the engine speed N and the accelerator operation amount θ is determined from the map. FIG. 19 shows a map of the target injection amount Qf. In FIG. 19, (N ₁ ,
Qf ₁₁ , the target injection amount at point θ 1 ) is set at point Qf ₁₁ , (N ₁ , θm).
Qfm ₁ , at (Nn, θ ₁ ) point Qf _1o , at (Nn, θm)
If Qfmn, the ROM 81 in the microcomputer section 2a contains Qf ₁₁ ,...Qf _n1 ,...
It is written as Qf _1o ,...Qf _no . Second
Figure 0 shows a flowchart for determining Qf. 1st
The calculation procedure for determining the target injection amount Qf=Qfxx at a certain operating point (Nx, θx) will be explained with reference to FIGS. 9 and 20. The engine is currently being operated with the engine speed Nx being Na<Nx<Nb and the accelerator operation amount θx being θa<θx<θb.
The target injection amount Qf corresponding to each mesh point is Qfaa at the (Na, θa) point, Qfba at the (Na, θb) point, and
The point (Nbpθa) is Qfab, and the point (Nb, θb) is Qfbb. Also, the point obtained by interpolation calculation is the (Nx, θb) point.
Let Qfbx be Qfax at the point (Nx, θa). First (Nx,
Qfax at point θa) is determined in step 160 using the following formula.

Qfax=Nx−Na/Nb−Na×(Qfab−Qfaa)+Qfaa Next, Qfbx is determined in step 161 using the following formula.

Qfax=Nx−Na/Nb−Na×(Qfbb−Qfba)+Qfba Next, Qfxx is determined in step 162 using the following formula.

Qfxx=θx-θa/θb-θa×(Qfbx-Qfax)+Qfax Next, in step 163, Qf=Qfxx and the process ends. The procedure described above is a method of searching for data using four-point interpolation from two-dimensional map data.

Next, FIG. 21 is a characteristic diagram showing the relationship between the engine speed N and the target injection amount Qf using the accelerator operation amount θ as a parameter, where θ ₁ is the idle operation line and θm is the maximum injection amount line. Therefore, as you step on the accelerator, the injection amount will be θ ₁ , θ ₂ , etc.
..., θ _n-1 , θ _n , and the desired injection amount can be obtained.

Next, step 157 is a step for calculating the target injection amount command value _VSN from the target injection amount Qf. The injection amount of the distribution type fuel injection pump has a characteristic that it changes depending on the rotational speed of the injection pump even if the position of the spill ring 4 as a fuel amount adjusting member is constant. FIG. 24 shows the characteristics of the injection amount Q depending on the rotation speed N with respect to the position of the spill ring 4. In Figure 24
Vp is the output voltage of the actual injection amount detector 7, and Vp=
Vp ₁ is the idle operating state, and Vp=Vpl is the position of the spill ring 4 at the maximum injection amount. Therefore, in the target injection amount command value calculation step 157, a correction calculation is performed so that the injection amount Q will be constant regardless of the rotational speed N if the position of the spill ring 4 is constant. Second
FIG. 5 shows a map for determining the target injection amount command value V _SN from the rotational speed N and the target injection amount Qf, and FIG. 26 shows the calculation procedure. In step 157, the target injection amount command value V _SN is obtained from the map by four-point interpolation. When the engine speed N=Nx is Na<Nx<Nb and the target injection amount Qf=Qfx is Qfa<Qfx<Qfb, the command value V _SN corresponding to each mesh point is (Na, Qfa) at the point Vsaa, (Na,
Vsba at the point (Qfb), Vsab at the point (Nb, Qfa), (Nb,
Qfb) point is Vsbb. Also, the points obtained by interpolation calculation are (Nx, Qfa) point Vsax, (Nx, Qfb) point
Vsbx. First, Vsax at the point (Nx, Qfa) is determined in step 165 using the following formula.

Vsax=Nx−Na/Nb−Na×(Vsab−Vsaa)+Vsaa Next, in step 166, Vsbx is determined using the following formula.

Vsbx=Nx−Na/Nb−Na×(Vsbb−Vsba)+Vsba Next, Vsxx is determined in step 167 using the following formula.

Vsxx=Qfx-Qfa/Qfb-Qfa×(Vsbx-Vsax)+Vsax Next, in step 168, V _SN =Vsxx is set and output.

In step 158, the target injection amount command amount _VSN from step 157 is input and output to the D/A converter. The D/A converter generates a command voltage Vs proportional to the command value _VSN and applies it to the electromagnetic actuator servo circuit 2b. In the electromagnetic actuator servo circuit 2b, the current to the coil 31 of the electromagnetic actuator 3 is increased or decreased by increasing or decreasing the command voltage Vs. Assuming that the target injection amount command value V _SN increases as the engine speed N decreases, the amplification stage 2
32 increases, and the output voltage of amplification stage 235 increases. Therefore, the output voltage of the comparison stage 237 increases, which increases the collector current of the transistor 247, increases the current flowing through the coil 31 of the electromagnetic actuator 3, and increases the attractive force. As a result, the spill ring 4 is moved to the increasing side. At the same time, the voltage generated across the resistor 245 is amplified by the amplification stage 236 and applied to the negative input terminal of the operational amplifier of the comparison stage 237, and is balanced by the value of the required attractive force generation current. Therefore, when the moving core 33 of the electromagnetic actuator 3 moves in the direction of arrow a, the core 14 of the actual injection amount detector 7 moves and the detection circuit 2
The output Vp of f becomes as shown in Fig. 17, and the amplification stage 2
35, V ₂₃₅ = K ₄ × (K ₂ V _S + V _P + Vb ₁ − Vb ₃ ) +
The voltage determined by V ₄ becomes an equilibrium state, and the engine is operated at that operating point. Conversely, when the engine speed increases, each numerical value moves in the opposite direction to the above operation, the injection amount decreases, the engine speed falls, and the engine is operated at a point where the injection amount and engine load are balanced. Furthermore, when stopping the engine, turning off the key switch 71 cuts off the power supply to the electric control circuit 2 and the electromagnetic actuator 3, so that no suction force acts on the moving core 33 and it returns to the return spring 35. Therefore, the spill ring 4 moves to the fuel cutoff position, and the engine is no longer supplied with fuel and stops.

In the above embodiment, the present invention is applied to a distribution type fuel injection pump, but it can also be applied to a row type injection pump, in which case the fuel adjustment member 4 corresponds to a rack.

Furthermore, although an example has been described in which an electromagnetic linear solenoid actuator is used as the actuator 3, the actuator 3 is not limited to this, and any type that can electrically control the position may be used. The link mechanism 38 may be operated by controlling the pressure in the chamber and moving the diaphragm. Alternatively, a so-called rotary solenoid that rotates by electromagnetic force may be used, and the fuel adjustment member 4 may be operated by converting the rotational motion into a substantially linear motion using a lever.

As described above, in the present invention, the target injection amount of the fuel injection pump is calculated by inputting various operating conditions, and the fuel adjustment member is operated to correct the error of the actual injection amount with respect to the target injection amount. ,
Since the engine cooling water temperature is detected as an electrical signal and the target injection amount is calculated by correcting the accelerator operation amount itself according to this signal, the injection amount correction based on the cooling water temperature always follows the governor pattern. As a result, this correction prevents the target injection amount from exceeding the maximum injection amount set in the governor pattern, resulting in good warm-up control such as suppressing the emission of black smoke etc. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the first embodiment of the present invention, Fig. 2 is a sectional view of the main part of the actual injection amount detector in Fig. 1, and Fig. 3 is the actual injection amount detection shown in Fig. 2. Figure 4 is a cross-sectional diagram of the main parts of the electromagnetic actuator in Figure 1, Figure 5 is a characteristic diagram of the electromagnetic actuator in Figure 4, and Figure 6 is a diagram showing the characteristics of the electromagnetic actuator in Figure 4. A cross-sectional configuration diagram of main parts when the invention is applied,
Figure 7 is a block diagram of the electrical control circuit in Figure 1.
Figure 8 is a block diagram of the microcomputer section in Figure 7, Figure 9 is an electrical circuit diagram of the rotational speed signal detection unit and interrupt control unit in Figure 8, and Figure 10 is the signal waveform of each part in Figure 9. Figure 11 is an electric circuit diagram of the amplifier circuit connected to the accelerator operation amount detector in Figure 7, Figure 12 is an electric circuit diagram of the waveform shaping circuit in Figure 7, and Figure 13 is an electric circuit diagram of the waveform shaping circuit in Figure 7. Figure 14 is an electric circuit diagram of the amplifier circuit connected to the cooling water temperature detector in the figure, Figure 14 is an electric circuit diagram of the detection circuit and oscillation drive circuit in Figure 7, and Figure 15 is the electric circuit diagram of the electromagnetic actuator in Figure 7. Electric circuit diagram of Yueta servo circuit, Figures 16 and 17
21 and 24 are characteristic diagrams for explaining the operation of the present invention, and FIGS. 18, 20, 23, and 26 show the arithmetic processing procedure in the microcomputer shown in FIG. Flowchart, 1st
9, FIG. 22, and FIG. 25 are schematic maps for explaining the operation of the present invention, and FIG. 27 is an overall configuration diagram for clearly explaining the configuration of the present invention. 1...Operating condition detector, 1a, 1b, 1c...
An accelerator operation amount detector, a rotation speed detector, and a cooling water temperature detector forming an operating condition detector, 2... an electric control circuit, 3... an electromagnetic actuator forming an electric servo means, 4... a fuel adjustment member, 5 ...Fuel injection pump, 6...Diesel engine forming an internal combustion engine,
7...Actual injection amount detector.

Claims (1)

[Claims] 1. An electric servo means for operating a fuel adjustment member of a fuel injection pump for an internal combustion engine, a rotation speed detection means and an accelerator operation amount detection means for detecting the rotation speed and accelerator operation amount of the internal combustion engine, and a fuel adjustment member for the fuel injection pump. an actual injection amount detector that generates an actual injection amount signal according to the injection amount; a cooling water temperature detection means that detects the cooling water temperature of the internal combustion engine; accelerator operation amount correction means for correcting the accelerator operation amount to a predetermined accelerator operation amount; target injection amount calculation means for calculating a target injection amount of the injection pump according to the corrected accelerator operation amount and the rotational speed; and the actual injection amount. 1. An electric governor for an internal combustion engine, comprising: error correction means for comparing the injection amount with the target injection amount and operating the electric servo means in a direction to correct an error between the two injection amounts.