JP2970544B2 - Rotation signal detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation signal detecting device for judging a failure of a rotating body synchronously rotating with a crankshaft using a reference signal from a signal generating means for outputting a signal corresponding to an engine speed.

[0002]

2. Description of the Related Art In general, in a pressure accumulating fuel injection system, fuel is raised to a predetermined pressure in a pressure accumulating chamber, and an operating condition for each time axis of an engine is determined by a reference output from a rotation sensor comprising a rotating body and signal generating means. The decision is made using the signal. Then, at a predetermined injection timing, a control valve interposed between the fuel injection nozzle and the accumulator is controlled to open and close to perform fuel injection. In such an accumulator type fuel injection device, the signal output from the rotation sensor is the most important signal.

On the rotating body, a plurality of detected parts are provided, and the detected parts are detected by a signal generating means to output an engine rotation pulse and a cylinder discrimination pulse, and to judge the failure. A rotation signal detection device is connected. The rotation signal detection device has abnormality detection means for determining that the rotation sensor has failed if one of the two signals of the engine rotation pulse and the cylinder determination pulse output from the rotation sensor is not input to the controller. And display the malfunction to the driver. Here, the failure of the rotation sensor assumes that the reference signal output from the rotation sensor is not output at a predetermined interval.

[0004]

With such a rotation signal detecting device, it is conceivable that a failure judgment of the sensor will be displayed even when the wheels are locked due to the road surface condition or the way of applying the brake. Can be For example, in the case of a manual vehicle, if the wheels are locked while the vehicle is running, the engine is stopped unless the clutch is disengaged, so the signal from the rotation sensor is not input to the controller at fixed time intervals, and the failure determination display is displayed. Will be done. In such a state, the driver may determine that the component has failed even though the rotation sensor functions normally, or may be forced to perform unnecessary work such as component replacement. Also,
In the pressure accumulating fuel injection device, when such a failure diagnosis is made, there is also a problem that the fuel injection is not performed correctly and the vehicle cannot travel.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotation signal detecting device capable of preventing erroneous failure determination, and for realizing this device, the device rotates in synchronization with a crankshaft of an engine. A plurality of detected parts for signal generation formed on the rotating body are detected by the signal generation means and a reference signal is output, and the speed of the vehicle is connected to the engine via the clutch by means of the vehicle speed detection means and the clutch. The gear position detecting means and the clutch connection / disconnection are detected by the clutch detecting means, respectively, and each signal outputted from each of these detecting means is inputted to the abnormality detecting means, and a failure judgment is made according to the input form of the signal. Perform

Specifically, the interval between one reference signal and the next reference signal output from the signal generating means is set to a predetermined time or more.
Basically determines malfunction when became, zero vehicle speed signal is output from the vehicle speed detecting means, the clutch contact signals from the clutch detecting means is outputted, and when the neutral signal from the gear position detecting means is not output Built-in program that does not execute failure judgment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotation signal detecting device according to the present invention is provided with a plurality of detected parts for signal generation and a rotating body which rotates synchronously with a crankshaft, and detects a detected part to generate a reference signal. Signal generating means, a vehicle speed detecting means for detecting the speed of the vehicle, a gear position detecting means for detecting the gear position of the transmission, a clutch detecting means for detecting the connection / disengagement of the clutch, and output from the signal generating means. The interval between one reference signal and the next is longer than a specified time
A vehicle speed zero signal from the vehicle speed detecting unit, a clutch engagement signal from the clutch detecting unit, and no neutral signal from the gear position detecting unit. Has a program function that does not judge it to be faulty. This allows
Even if the signal information from the signal generating means is in the form of a signal indicating a failure, if the speed is zero, the clutch is in the engaged state, and the transmission is not in neutral, the wheel is in a locked state during traveling and the failure determination is made. It is not executed and erroneous failure determination is avoided.

This rotation signal detecting device may be used in combination with a pressure accumulating type fuel injection device which performs fuel injection control using a reference signal output from a signal generating means. Also in this case, the failure determination is not performed unless the vehicle speed detecting means and the clutch detecting means output the vehicle speed zero signal and the clutch engagement signal, and the gear position detecting means does not output the neutral signal. In other words, when the wheels are in the locked state during traveling, no failure determination is made, so that normal traveling is possible if the locked state is released.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. The rotation signal detection device shown in FIG. 1 is adapted to a four-cycle six-cylinder engine E. This rotation signal detecting device includes a disk 2 serving as a rotating body on a crankshaft 1.
Are fixed, and a plurality of projections 3 to be detected are formed on the outer periphery of the disk 2 at every 15 ° crank angle. The toothless portion 4 is formed in a portion corresponding to, for example, the top dead center TDC of the first cylinder or the reference position indicating the top dead center of the six cylinders among the protrusions 3 located on the same center.

The camshaft 5 synchronized with the crankshaft 1 via a gear mechanism (not shown) rotates at half the rotation of the crankshaft 1. The camshaft 5 is fixed with a disk 6 having projections 7 formed on the outer periphery thereof at every 120 ° crank angle. That is, the projections 7 are arranged on the outer periphery of the disk 6 at every 60 °. Then, the projection 7 corresponding to the reference position indicating the top dead center of the first cylinder
Immediately before, an extra end 8 is formed.

Electromagnetic pickups 10 and 11 as signal generating means for generating a signal each time the projections 3 and 7 and the extra teeth 8 pass are arranged near these two disks 2 and 6, respectively. Here, an output signal from the electromagnetic pickup 10 is an engine rotation signal (Ne signal), and an output signal from the electromagnetic pickup 11 is a cylinder discrimination pulse (G
Signal). These two signals constitute a basic signal, and after a waveform shaping circuit 12 shapes the waveform, the circuit 1
The signal is input to the abnormality detecting means 13 connected to the electromagnetic pickups 10 and 11 via the control unit 2.

The abnormality detecting means 13 comprises a main part of a well-known microcomputer.
_The cylinder discrimination and the crank angle are calculated based on the _Ni signal and the t _Gi signal, and the fuel injection control, the ignition timing control, and the like are partially executed based on the calculation result. The abnormality detecting means 13 is connected to the engine E via a vehicle speed sensor 14 and a clutch 15 serving as a vehicle speed detecting means for detecting the speed of the vehicle.
A neutral switch 17 serving as a gear position detecting means for detecting a neutral position of the transmission 16 separated from and connected to the transmission 16, a switch 18 serving as a clutch detecting means for detecting connection and disconnection of the clutch 15, and a failure display section for the disks 2 and 6. Warning lamps 22 are respectively connected.

The vehicle speed sensor 14 detects the rotation of the wheels 21 and outputs a vehicle speed signal Vn corresponding to the detected vehicle speed. The vehicle speed sensor 14 may output the vehicle speed signal Vn by detecting the rotation of the disks 2 and 6 serving as the rotating body of the drive system instead of the rotation of the wheels 21. Here, the neutral switch 17 that outputs the vehicle speed zero signal V ₀ particularly when the vehicle speed is zero is disposed in the shift unit 19 that operates the transmission 16, and turns on when the shift lever (not shown) is in the neutral position, and the neutral switch is turned on. Signal N
Is output. When the clutch pedal 20 for operating the clutch 15 is depressed in the direction of the arrow, the clutch switch 18 is turned off. When the clutch is in the normal state shown in the drawing, the clutch switch 18 is turned on to output the clutch engagement signal C. Here, the neutral position is detected and its signal is used. However, it is detected that the transmission is located at any one of the first to seventh speeds, and this detection signal is used instead of the neutral signal N. May be.

In the abnormality detecting means 13, Ne signal and G
The failure of the disks 2 and 6 is determined based on the signals, and certain signals t _Ni and T _{Gi of the} Ne signal and the G signal are used.
Next signal t _Ni-1 and, t _Gi-1 interval and TNE _i, TG _i becomes a predetermined time or more, and the vehicle speed signal Vn is zero vehicle speed signal V
_{At 0} , there is a built-in control logic unit 23 that does not judge a failure when the clutch engagement signal C is inputted without the neutral signal N.

Here, the cylinder discrimination and the rotation angle position discrimination will be described. As shown in FIG.
It is determined whether or not the electromagnetic pickup 11 generates a pulse signal corresponding to the extra teeth 8 of the camshaft 5 during the period t of the four pulse signals before the generation of the pulse signal generated by the electromagnetic pickup 10 at the position corresponding to The detection determines whether the cylinder is the first cylinder or the sixth cylinder. In this case, there is a pulse signal corresponding to the extra tooth 8 during the period t, and the position corresponding to the pulse signal immediately before the detection of the missing tooth portion 4 indicates the top dead center of the first cylinder. That is, if the pulse signal corresponding to the extra teeth 8 on the camshaft 5 is not detected during the period t in which four pulse signals before the pulse signal are detected after the detection of the toothless portion 4 that rotates integrally with the crankshaft 1, The position where the pulse signal is generated immediately after the detection of the missing tooth portion 4 is determined as the top dead center of the sixth cylinder, and if the pulse signal indicating the extra tooth 8 is detected, it is determined as the top dead center of the first cylinder. . As described above, in the normal operation state, it is determined whether the cylinder is the first cylinder or the sixth cylinder within one rotation of the crankshaft 1.
Each rotational angle position of the top dead center of the cylinder or the top dead center of the sixth cylinder is detected.

As shown in FIGS. 3 and 4, the control logic unit 23 performs a failure determination routine based on a signal generated by the first electromagnetic pickup 10 on the crankshaft 1 side and a failure determination routine on the camshaft 5 side. 2 electromagnetic pickup 1
And a failure determination routine based on the signal generated by the control unit 1.

First, the failure determination using the failure determination routine shown in FIG. 3 will be described. In step A1, the pulse rise time (t _Ni ) generated by the first electromagnetic pickup 10 according to the rotation of the crankshaft 1 and the vehicle speed signal (Vn)
At step A2, the pulse rising time (t
_Ni ) and the time T elapsed since the last pulse rise (t _Ni-1 )
_{NE i = (t Ni) -} (t Ni-1) is calculated, step A3
The predetermined time set by the elapsed time TNE _i (here, 0.
5 seconds) or more. If the elapsed time TNE _i ≧ 0.5 seconds, the process proceeds to step A4, where the failure determination avoidance mode, which is a main part of the present application, is entered, and the elapsed time Tn
If ei <0.5 seconds, the normal failure determination mode is executed, and in step A8, it is determined whether or not the number of pulse inputs during the period of one rotation of the crankshaft 1 before the time Tni is a predetermined number. This predetermined number is equal to the number of the projections 3 formed on the disk 2, and is 23 in this case. In step A8, if the number of pulse inputs is not 23, the process proceeds to step A7, where the elapsed time TNE of the pulse is inputted.
_It is determined that _i has exceeded the predetermined time, and it is determined that the pulse of the disk 2 is abnormal. In step A11, the warning lamp 22 is turned on. If there are 23 pulse inputs, the process proceeds to step A9 where the pulse of the disk 2 is output. It is determined that it is normal. If this pulse is normal, the rotation speed NE is determined in step A10.
Is calculated.

In the failure determination avoiding mode in step A4, the input state of each signal from the vehicle speed sensor 14, the crack switch 18, and the neutral switch 17 is determined.
First the vehicle speed signal Vn at A4 step is zero vehicle speed signal V _0, the clutch contact signal C is inputted in step A5, the neutral signal N is not input in step A6, i.e., the three from the step A4 to step A6 If the conditions are met, it is assumed that the wheel 21 is in the locked state, and the process once proceeds to step A8 without performing the sudden abnormality determination. Then, in step A8, the number of pulse inputs is determined in the same manner as described above.
Then, it is determined that the pulse of the disk 2 is normal, and no abnormality determination is performed.

On the other hand, in steps A4 and A5, each signal V ₀ ,
If C is not input, the process proceeds to step A8 to execute the normal failure determination mode, and in step A6, N
When a signal is input, already because the elapsed time TNE _i of the pulse has passed the predetermined time, the routine proceeds to step A7,
It is determined that the disk 2 is abnormal, and the warning lamp 22 is turned on in step A11.

The failure determination using the failure determination routine shown in FIG. 4 will be described. First, a pulse rising time t _Gi generated by the second electromagnetic pickup 11 according to the rotation of the camshaft 5 is input in step B1. Then the pulse rise time t _Gi and the previous pulse rise in step B2 (t _Gi-1) because the elapsed time _{TG i = (t Gi) -} (t Gi-1) to calculate the elapsed time in step B3 TG _i Is longer than 4 seconds. If the elapsed time Tgi ≧ 4 seconds, the process proceeds to step B4 to enter the failure determination avoidance mode, which is the gist of the present application, and if the elapsed time Tgi <4 seconds, the normal failure determination mode is executed. t _Gi
It is determined whether or not the number of pulse inputs during a period in which the front camshaft 5 makes one rotation is a predetermined number. This predetermined number is equal to the sum of the number of protrusions 7 formed on the disk 6 and the sum of the extra teeth 8, and here is seven. Then, Step B8
In step B, if this pulse input number is not 7,
The elapsed time TG _i pulse proceeds to 7 it is determined that the pulse abnormality of the disk 6 to conclude that exceeds the predetermined time, step B1
In step 1, the warning lamp 22 is turned on, and if there are seven pulses input, the process proceeds to step B9 where it is determined that the pulse of the disk 6 is normal. If the pulse is normal, the rotational speed NE is calculated in step 10.

When the failure determination avoidance mode is set in step B4, the input state of each signal from the vehicle speed sensor 14, the crack switch 18, and the neutral switch 17 is determined.
First the vehicle speed signal Vn in B4 step is zero vehicle speed signal V _0, the clutch contact signal C is input in step B5, the neutral signal N is not input in step B6, i.e., the three from the step B4 to step B6 If the conditions are met, it is assumed that the wheels 21 are in the locked state, and the process once proceeds to step B8 without performing abnormality determination. Then, in step B8, the number of pulse inputs is determined in the same manner as described above, and if there is a predetermined number, the process proceeds to step B9, where it is determined that the pulse of the disk 6 is normal, and no abnormality determination is performed.

On the other hand, in steps B4 and B5, each signal V ₀ ,
If C is not input, the process proceeds to step B8 to execute the normal failure determination mode, and in step B6, N
When a signal is input, since the elapsed time TG _i already pulse has passed the predetermined time, the routine proceeds to step B7, determines that abnormality of the disk 6, thereby lit the warning lamp 22 in step B11.

As described above, when the clutch signal C and the vehicle speed zero signal V ₀ are input to each of the failure determination routines and the neutral signal N is not input, control is performed so that the failure determination is not performed immediately. Engine E while driving
Is stopped, it is determined that it is not a failure of the rotating bodies 2 and 6. Therefore, since the warning lamp 22 for notifying the abnormalities of the rotating bodies 2 and 6 is not turned on, it is not necessary to give erroneous information to the driver, and it is not necessary to perform unnecessary work such as replacing parts.

When the above-described rotation signal detecting device is applied to a pressure accumulating type fuel injection device, an output signal from the electromagnetic pickup 11 is determined by a cylinder discrimination pulse (G signal), step A10,
The rotation speed NE calculated in B10 may be used as an engine rotation signal as a reference signal for well-known fuel injection control, ignition timing control, or the like of the accumulator type fuel injection device, or common pressure control. In this way, even if the wheel 21 is locked, the rotating bodies 2 and 6 are not determined to be abnormal,
Various controls are correctly performed, and a state in which the vehicle can travel is maintained.

In the above-described example, the projections 3 and
Although the 7 and the extra end 8 are used, the present invention is not limited to this, and a plurality of slits provided in the disks 2 and 6 may be used as another example.

[0026]

According to the first aspect of the present invention, even when the wheels are locked due to the road surface condition or the way of applying the brake, the failure determination of the sensor is not performed and the display is not performed. While preventing failure judgment,
There is no need to perform unnecessary work such as replacing parts.

According to the second aspect of the present invention, even in the case where the pressure-accumulation type fuel injection device is provided, such erroneous failure determination is not performed. It becomes possible to run.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a rotation signal detection device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram illustrating a signal generated by a signal generation unit.

FIG. 3 is a flowchart illustrating an example of a failure determination routine that is a main part of the present invention.

FIG. 4 is a flowchart illustrating another example of a failure determination routine that is a main part of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crankshaft 2,6 Rotating body 3,7,8 Detected part 10,11 Signal generating means 13 Abnormality detecting means 14 Vehicle speed detecting means 15 Clutch 16 Transmission 17 Shift stage detecting means 18 Clutch detecting means C Clutch engagement signal E Engine N Neutral signal V ₀ Vehicle speed zero signal Ne, G Reference signal

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-245061 (JP, A) JP-A-61-4964 (JP, A) JP-A-61-21454 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F02D 45/00 362

Claims (2)

(57) [Claims] 1. A rotating body that rotates in synchronization with a crankshaft of an engine and has a plurality of detected parts for signal generation, and signal generating means for detecting the detected parts and generating a reference signal. Vehicle speed detection means for detecting the speed of a vehicle equipped with the engine; gear position detection means for detecting a gear position of a transmission connected to the engine via a clutch; and clutch detection for detecting connection and disconnection of the clutch. Means, when the interval between a certain reference signal output from the signal generation means and the next reference signal is equal to or longer than a predetermined time, a vehicle speed zero signal from the vehicle speed detection means is input, and a clutch is detected from the clutch detection means. Abnormality detection means for determining that a failure has not occurred when a contact signal is input and a neutral signal is not input from the gear position detection means. Translocation signal detection apparatus. 2. The rotation signal detecting device according to claim 1, wherein said rotation signal detecting device is applied to a pressure accumulating type fuel injection device which performs fuel injection control using a reference signal output from said signal generating means.