JPS5823253A - Automatically starting and stopping method of automobile engine - Google Patents

Abstract

PURPOSE:To easily diagnose suitability of detecting action of each detector switch, by switching to a self diagnostic condition, deciding the action at each operation of various detector switch and displaying a diagnostic result through turning on-off of a lamp. CONSTITUTION:Self diagnosis of an automatic start stop system is performed such that a diagnosis switch 25 is pressed at stopping of a car to execute a self diagnostic routine by a microcomputer 20. Firstly a starter 11 is turned off and set, then a signal of each switch 17, 18a, 18b, 19, 23, 24 of the first, second clutch, door, heat light, right turn, etc. is stored to an RAM in six bits with action of each switch as 1 bit, when a number of bits different from a reference signal is O or even, a lamp 26 is turned off. Under this condition, in case of operating only a certain switch, if in odd number and turned on, the switch is decided normal, while if as left to be turned off, the switch is decided in failure. This operation is successively performed, and each switch can be easily diagnosed.

Description

[Detailed Description of the Invention] The law relates to a method that automatically starts the engine when starting a car, maintains the rotation of the engine after the car starts based on the fact that the car is in a running state, and The present invention relates to a method for automatically starting and stopping an automobile engine, which stops the engine when the automobile stops.

Conventionally, as this type of automatic start/stop method, for example, a set switch is used as a detection switch for detecting various driving states of a car for control.

Many things are used, such as clutch switches, door switches, headlight switches, right-turn switches, etc.

Therefore, if the signal line (wire) to each detection switch is not able to perform its normal operation due to a failure such as wire breakage, switch failure, etc., the signal There were so many wires that it was difficult to find the faulty part.

The present invention is intended to solve this problem, and its purpose is to automatically start and stop the engine by switching to a self-diagnosis state to determine the operation of each detection switch each time the various detection switches are operated, and to turn on a diagnostic display. Alternatively, the purpose is to easily diagnose whether the detection operation of each detection switch is appropriate by turning off the light.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 11 and 12 respectively indicate a starter and an ignition circuit of an automobile engine (fueled by gasoline), and the starter 11 is an ignition switch. It is connected to the DC power supply 10 of the vehicle battery via 13.

When the ignition switch 13 is operated to temporarily connect the movable contact 13a to the fixed terminal 13o, the starter 11 is supplied with power from the DC power source 10 and starts, putting the engine in a cranking state. The ignition circuit 12 includes a control circuit 12a connected to a signal generator provided in a distributor of the engine, and an ignition coil 12c connected to the control circuit 12a via a transistor 12b. The transistor 12t) becomes conductive under the control of the control circuit 12a in response to the generation of a signal from the signal generator and becomes non-conductive in response to the disappearance of the signal from the signal generator. The ignition coil 12 is energized in response to the conduction of the transistor 12b in a state where it can receive power from the DC power supply lO, and is cut off from the energized state in response to the non-conduction of the transistor 12b to generate a high voltage and apply it to the distributor. .

The alternator 14 is connected between the DC power supply 10 and the regulator relay 15. When driven by the engine, the alternator 14 generates a full AC voltage at the neutral point N of its stator coil and converts it into DC voltage. power supply 10
supply to. The regulator relay 15 includes an electromagnetic coil 15a connected between the neutral point N of the stator coil of the alternator 14 and a ground terminal 15c, and a double-headed contact connected to the ground terminal 15c or a left-end terminal 15a connected to the DC power supply 10. 15b and fully equipped. However, electromagnetic coil 1
When 5a is in the demagnetized state, double-headed contact 15b is connected to ground terminal 15C to generate a low voltage LO from the output terminal. When the electromagnetic coil 15a is excited by the AC voltage generated at the neutral point H of the stator coil, the double-headed contact 15b is connected to the fixed terminal 15d and the high voltage H1 is applied from the output terminal.
occurs.

The microcomputer 20 has a regulator relay 15
．． Speed sensor 16. Set switch 17゜first clutch switch 18a, second clutch switch 18b and door switch 19. Headlight switch 23. Right turn switch 24. It is connected to the diagnosis switch 25. The speed sensor 16 is composed of a disc 16a made of a permanent magnet and a reed switch 16b arranged to form a magnetic relationship with each protrusion of the disc 16a. It is attached to a speedometer drive cable 16c connected to the output shaft of the power transmission device. Therefore, the disc 16a is connected to the drive cable 1.
6c, the reed switch 16b sequentially detects each protrusion on the disc 16a and generates a series of speed pulses corresponding to the actual running speed of the vehicle.

The set switch 17 is a normally open switch having a self-reset function, and is provided at a suitable location in the cabin of the vehicle. Thus, the set switch 17 generates a set signal by temporarily opening it. The first and second clutch switches 18a and 18b are both provided on the clutch pedal of the vehicle, and the first clutch switch 18a is of a normally open type, so that when the clutch pedal is fully depressed, the first clutch switch 18a is of a normally open type. Generate a signal. The second clutch switch 18b is of a normally closed type, and generates a second clutch signal when the clutch pedal is depressed, and disappears when the clutch pedal is released. The door switch 19 is provided on the door of the automobile, and when the door is opened, it is in a closed state to generate a door signal, and this door signal is extinguished when the door is closed.

The headlight switch 23 is turned on to turn on the headlights, and in this case, a signal is input to prohibit the engine from stopping, since power consumption is large as an electrical load on the vehicle battery. In addition, the right turn switch z4 is used to turn on a signal to prohibit engine stop t and enable a quick start when the vehicle temporarily stops to make a right turn at a road intersection or the like. Further, the diagnosis switch 25 is turned on at the time of self-diagnosis to switch the microcomputer 20 to arithmetic processing of the self-diagnosis program.

The lamp 26 displays the automatic start/stop state during normal control, and switches to display the diagnosis result during self-diagnosis.

The microcomputer 20 is formed of an LSI, and becomes activated in response to a constant voltage (5V) generated from a constant voltage circuit 21 by power supply from the DC power supply 10 when the ignition switch 13 is closed. The microcomputer 20 includes a central processing unit (hereinafter referred to as CPU).
, an input/output device (hereinafter referred to as work 10), a read-only memory (hereinafter referred to as ROM), a random access memory (hereinafter referred to as RAM), and a clock circuit, and these CPU, work 10゜ROM
, RA, M and the clock circuit are connected to each other via a pass line. 10 is the regulator relay 15
Low voltage Lo (or high voltage H1) from speed sensor 16
, the set signal from the set switch 17, the first and second clutch signals from the first and second clutch switches 18a and 18b, the door signal from the door switch 19, the headlight switch 23. A signal from the right turn switch 24 is received and applied to the RAM. The clock circuit is connected to a crystal oscillator 22 and cooperates with the crystal oscillator 22 to generate a series of clock signals.

The ROM stores in advance a main control program and an interrupt control program necessary for the CPU to execute the flowcharts shown in FIGS. 2 and 3, respectively.

The CPU has an interrupt timer, and this interrupt timer starts timing at the same time as the microcomputer is started, and the measured value is l m l! When e c is reached, it is reset and starts counting again. Thus, the CPU executes the main control program in response to a series of clock signals from the clock circuit, and the time value of the interrupt timer is l m
Every time s e c is reached, execution of the main control program is stopped and the interrupt control program is executed. By alternately executing both control programs, various calculation processes are performed as described below, and the starter 11 is Drive signal (or start/stop signal) necessary to drive (or stop)
and generation of an energization signal (or energization stop signal) necessary for energization (or energization stop) to the ignition coil 12a. In this case, the execution of the main control program by the CPU is repeatedly completed within 10 msec after its start.

A lamp 26° starter relay 32 and an ignition relay 34 are connected to the microcomputer 20 via transistors 31 and 33, respectively. The transistor 31 is connected at its base to the terminal 10 of the microcomputer 20 and at its emitter to a fixed terminal 131 of the ignition switch 13. When the ignition switch 13 is closed, the transistor 31
It becomes conductive upon receiving a drive signal from the PU, and becomes non-conductive upon receiving a drive stop signal from the CPU. The transistor 33 is
Its emitter is grounded and its base is connected to the circuit 10, and becomes non-conductive upon receiving an energizing signal from the CPU, and becomes conductive upon receiving an energizing stop signal from the CPU.

The starter relay 32 has an electromagnetic coil 32a and a normally open contact 32.
The electromagnetic coil 32a is grounded at one end and connected to the collector of the transistor 31 at the other end, and is excited by receiving power from the DC power supply 10 while the transistor 31 is conducting. Demagnetized in response to non-conduction.

The normally open contact 32b of the starter relay 32 is connected between the DC power supply 10 and the starter 11, and the electromagnetic coil 32
closed in response to the excitation of a from the DC power supply 10 to the starter 11
The starter 11 is started by allowing power to be supplied to the starter. Also,
The normally open contact 32kl opens in response to demagnetization of the electromagnetic coil 32a to cut off the power supply to the starter 11 and stop it. The ignition relay 34 consists of an electromagnetic coil 34a and a normally closed contact 34b, and the electromagnetic coil 34a is connected to a fixed terminal 131) of the ignition switch 13 and a transistor 33.
It is connected between the collectors of the transistor 33 and is demagnetized when the transistor 33 is non-conducting, and is energized by receiving power from the DC power supply 10 in response to the transistor 33 being conductive.

When the electromagnetic coil 34a is in a demagnetized state, the normally closed contact 34b closes and connects the DC power supply 10 to the ignition coil 12.
It opens in response to the excitation of the electromagnetic coil 34a to cut off the power supply to the ignition coil 12c.

In this embodiment configured as described above, when the ignition switch 13 is operated to connect the movable contact 13a to the fixed terminal 13b while the vehicle is stopped, the constant voltage circuit z1 is connected to the DC power source. 10 generates a constant voltage, and in response to this, the microcomputer 20 enters the operating state (1υ state).At the same time, the CPH interrupt timer starts measuring time, and the CPU executes the flowchart shown in Fig. 2. Accordingly, execution of the main control program is started in step 40. Next, when the ignition switch 13 is operated to temporarily connect the movable contact 13a to the fixed terminal 13c, the starter 11 starts supplying power from the DC power supply 10. In response, the engine is started in cooperation with the ignition circuit 12. At this time, the regulator relay 15 generates a high voltage Tu under the control of the alternator 14. Note that the reed switch 16b closes the disc 16 when the vehicle is stopped.
It is assumed that it is closed due to the magnetic relationship with a.

When the main control program proceeds to step 41 in this state, the CPU initializes the contents of the microcomputer 20, resets the flag FB, and sets the flag F2 to the actual level of the speed pulse from the speed sensor 16 (current level). Since the reed switch 16b is closed, the speed pulse to be generated from the reed switch 16b is assumed to be at a low level, that is, D(12). Step 42
Then, it is determined whether the flag Fs is in the reset state. In this case, the flag F day indicates that the set condition for setting the engine under automatic start/stop control is satisfied, and the set condition is that the regulator relay 15 is generating high voltage H1, This is established when the above three requirements are satisfied simultaneously: the door signal from the door switch 19 has disappeared, and the set switch 17 is generating a set signal.

As described above, when the main control program proceeds to step 42, the CPU determines "YES" based on the reset state of flag F8 in step 41, and proceeds to step 43 to determine whether the set condition is satisfied. Determine presence/absence. However, at this stage, at least the set switch 17 is not operated, so C! The PU determines "NO" in step 43, advances the main control program to step 50, and determines whether or not the stop condition for the starter 11 is met. In this case, the condition for stopping the starter 11 is established by satisfying the requirement that the regulator relay 15 generates the high voltage H1.

At this stage, the engine has started and the regulator relay 15 is generating high voltage H1, so the CP
, U is determined to be [ymsJ at step 50, and the main control program returns to step 42 through step 51. Note that during the execution of the main control program described above, C
Each time the measured value of the interrupt timer reaches 1 m 11 e c, the PU stops executing the main control program and executes the interrupt control program shown in the flowchart of FIG. 2.

During the execution of each of these control programs, the door switch 19 responds to the closing of the door of the vehicle by extinguishing the door signal, and the set switch 17 generates a reset signal even when the door is temporarily operated. When the main control program reaches step 43 in the meantime, the CPU generates the high voltage H1 from the regulator relay 15 and the set signal from the set switch 17, as well as the door switch 19.
Based on the disappearance of the door signal, the determination is ``YES'', and the main control program is further advanced to set the flag FB at step 44, and reset the flag F1 at the next step 45. In this case, the flag F1 is the speed sensor 16
represents that the velocity pulse originating from has changed in its level.

When the main control program proceeds to step 46 to determine whether or not the 7-lag F1 is in the reset state, cptr determines l'-yEsj based on the result obtained in step 45, and the main control program returns to step 42. Return to Then, C
Based on the result of setting the flag FB in step 44, the PU determines "NO" in step 42, and advances the main control program to step 52 in which it determines whether or not a condition for canceling the engine automatic start/stop control is met. .

In this case, the cancellation condition is satisfied by the generation of a door signal from the door switch 19 or the generation of a set signal from the set switch 17 while the flag Fs is set, and the requirement α5) is satisfied. Therefore, based on the fact that the door signal from the door switch 19 has disappeared and the set signal has not been generated from the set switch 17,
The CPU determines "NO" in step 52, and returns the main control program to step 42 through step 46.

In such a state, when the vehicle starts by operating its starting operation mechanism, the traveling speed of the vehicle is detected as a speed pulse by the speed sensor 16 and provided to the microcomputer 20 . At this stage, the CPU stops executing the main control program in response to the clock value from the interrupt timer and starts executing the interrupt control program in step 6.
0 (see FIG. 3), the speed pulse from the speed sensor 16 is stored in the RAM in the next step 61. Therefore, when the interrupt control program proceeds to step 62, "l::cPU" determines whether the speed pulse stored in step 61 is at a high level.

If the speed pulse stored in step 61 is at a high level (16), the cpty advances the interrupt control program to step 64 and determines whether flag F2 is at a high level, that is, 1. Then, the CPU determines "'MO" based on the level of the flag IFz in step 41 of the main control program, advances the interrupt control program to step 66, and sets the flag F2=1. When the interrupt control program proceeds to step 67, the CPU
The content C of the counter provided in AM is reset, and then the flag Fl is set in the next step 68, and the interrupt control program is completed in step 72. In this case, R
The AM counter counts the time during which the level of the speed pulse stored in the RAM does not change in response to a clock signal from the clock circuit. Note that if the determination result in step 62 is "No", the CPU advances the interrupt control program to step 63.

When the main control program advances to step 46 after the execution of the interrupt control program is completed, the CPU determines "NO" based on the set result in step 68 of the interrupt control program, and advances the main control program to step 47. , determine whether the engine is stopped. Then, C
The PU determines "NO" based on the high voltage H1 from the regulator relay 15, and then in step 53 determines whether the engine stop condition is satisfied.

In this case, the conditions for stopping the engine are that the headlight switch 23 and the right turn switch 24 are off, and the second
The second clutch signal from the clutch switch 18b has disappeared and the count value by the RAM counter is 2s.
ec (the time required for the vehicle to stop after the brake pedal is operated). However, at this stage, since the count value of the RAM counter is not 2 seconds, (1! PU determines "No" in step 53 and returns the main control program to step 42.

Thereafter, when the execution of the main control program shifts to the execution of the interrupt control program in the same way as in the case described above, the speed pulse from the speed sensor 16 is stored in the RAM in step 61.
is memorized. Thus, if the speed pulse stored in this RAM is at level 4, i.e. 0, the CPU executes step 6.
3, the interrupt control program advances to step 63, where it is determined whether flag F2=0. Then, (!PU determines "NO" based on the set result F2-1 in step 66, and
Set IF 2=O in step 5, and set RA in step 67.
Reset the counted value C by the counter of M, and step 6
At step 8, the flag F1 is set and the execution of the interrupt program is ended. When the main control program proceeds to step 46 after the execution of this interrupt section program is completed, the CPU determines "1NO" as in the case described above, and the interrupt control program e
Proceeding roughly, it is determined "NO" in steps 47 and 53 one after another. Note that if the determination result in step 62 of the interrupt control program described above is [yxsJ,
Based on the set result F2=1 in step 66, the CPU determines YESJ (19) in step 64 and advances the interrupt control program to step 69.

As can be understood from the above explanation, while the vehicle is running, based on the level change of the speed pulse generated from the speed sensor 16, that is, the change from a low level to a high level, or from a high level to a low level. The rotational state of the engine is maintained.

In such a driving state of the vehicle, if the brake pedal is operated to temporarily stop the vehicle at an intersection, etc., the interrupt control program that passes through steps 65 (also halo 6) and 68 and steps 42, 52, and 46
．． Each execution of the main control program passing through 47 and 53 is
The vehicle is decelerated while U is repeated, and stops with the second clutch signal being generated from the second clutch switch 18b by depressing the clutch pedal, and the speed sensor 16
The disc 16a stops its rotation and the reed switch 16
The generation of velocity pulses is extinguished from b. After that, the clutch pedal is released to extinguish the second clutch signal (20). In this case, the reed switch 161)
It is assumed that the capacitor 6a is closed due to the magnetic relationship with the capacitor 6a and generates a low level signal.

Thereafter, when the interrupt control program is executed in the same manner as described above, the low level signal from the speed sensor 16 is stored in the RAM in step 61. Then, in step 62, the CPU determines "NO" based on the storage level in step 61, and in step 63, based on the set result 'F2=0 in step 65, it determines [yx sJ. Next, when the interrupt control program proceeds to step 69, the counter of the RAM sets its count value to "1", and the CPU proceeds to the next step 70.
It is determined whether the count value by the AM counter is 2 seconds. At this stage, since the count value of the RAM counter has not reached 2 seconds or more, the CPU determines "NO" in step 70 and ends the execution of the interrupt control program. Note that the added value "1" by the RAM counter corresponds to the time (21) (1 msec) required to execute the interrupt control program.

When the execution of the main control program is started after the execution of this interrupt control program is finished, (!PU determines "NO" in step 53 based on the control result in step 70 of the interrupt control program and executes the main control program. Step 42
Return to Thereafter, the CPU performs the addition operation in step 69 of the WJ control program and the "N"
The determination as "O" and the determination as "NO" in step 53 of the main control program are repeated alternately. After that,
When the addition result in step 69 of the interrupt control program becomes 2 seconds or more, C! The PU determines YESJ in step 70, and sets the count value of the RAM counter to 2 seconds in step 71. Therefore, when the main control program proceeds to step 53, the CPU controls the headlight switch 23. Based on the off state of the right turn switch 24, the disappearance of the second clutch signal from the second clutch switch 18b, and the setting result in step 71
ygsj, the main control program is advanced to STELLA t99) step 54, a energization stop signal is generated, and the lamp 26 is turned on. Then, the transistor 33
In response to the energization stop signal, the conductive ignition relay 34 activates the electromagnetic coil 34a to open the normally closed contact 341).
the ignition coil 12c to stop supplying power to the ignition coil 12c. This causes the engine to stop and regulator relay 1
5 generates a low voltage TJ o.

When the main control program passes through step 50, returns to step 42, and reaches step 47, C! PU says “yy:sJ
Then, the main control program proceeds to step 48 where it is determined whether the driving conditions for the starter 11 are satisfied. In this case, the driving condition for the starter 11 is established by simultaneously satisfying two requirements: the regulator relay 15 is generating the low voltage Lo, and the first clutch switch 18a is generating the first clutch signal. .

Then, the CPU determines "NO" in step 48 based on the disappearance of the second clutch signal, and determines "NO" in step 50 based on the low voltage LO from regulator relay 15 (23). After making a determination, the main control program returns to step 42.

Further, if the IJ-do switch 161) is opened due to the magnetic relationship with the disk 16a and generates a high-level signal when the two consecutive vehicles are temporarily stopped, the interrupt control program proceeds to step 61. When moving forward, the speed sensor 16
The high level 'G 45 from is stored in RAM. Next, in step 62, the CPU determines [yxsJ] based on the memory level in step 61, and in step 64
At step 65, the determination is "NO" based on the set result F2=O, and at step 66, F2-] is selected, and the interrupt control program proceeds to step 72. Then, when the interrupt control program reaches step 64 again, (!PU is the set result F in step 66)
2-1, it is determined as [yEsl, and the interrupt control program proceeds to step 69. After the interrupt control program proceeds to step 69 in this way, the CPU performs the addition (24) calculation in step 69 of the interrupt control program and the determination as 1NO in step 70 in the same manner as described above. The determination as "NO" in step 53 of the main control program is repeated alternately, and when the addition result in step 69 becomes 28.theta.C, the interrupt control program advances to step 71. When the main control program proceeds to step 53 after this interrupt program ends, the CPU determines l'-yEsJ in the same way as in the case described above, generates a energization stop signal in step 54, and stops the ignition circuit. 12 is stopped, the engine is stopped, and low voltage I+o is generated from regulator relay 15.

When the vehicle and engine are temporarily stopped, the clutch pedal is operated to send the first clutch signal to the first clutch switch 18 in order to start the vehicle again.
When generated from a, the main control program executes step 48.
When the process proceeds to step 49, the CPU determines that it is l"'yxsJ, and in step 49 generates a drive signal and turns off the lamp 26.

Then, the transistor 31 receives the drive signal (25
) The starter relay 32 conducts in response to the electromagnetic coil 3.
2a closes the normally closed contact 32'b, and the starter 1
1 to start the engine. At this time, the regulator relay 15 is activated by the alternator 1 due to engine starting.
A high voltage H1 is generated under the control of 4. Therefore, when the main control program proceeds to step 5o, the CPU outputs l-ym based on the high voltage H1 from the regulator relay 15.
sJ, and a drive stop signal is generated in step 51.

As a result, the transistor 31 becomes non-conductive, and the normal H contact of the starter relay 32 is opened to stop the starter 11. Thereafter, the vehicle starts by operating its starting operation mechanism.

Additionally, when the door of the vehicle is opened while the vehicle and engine are temporarily stopped, the door switch 19
generates a door signal. When the main control program proceeds to step 52 in such a state, the CPU sometimes determines [yxsJ] based on the occurrence of the door signal, and the main control program proceeds to step 55 to reset the flag F2. After that (26), the CPU generates a drive stop signal in step 56,
Then, in step 57, an energization signal is generated.

As a result, the transistor 31 becomes non-conductive in response to the drive stop signal, maintains the normally open contact 32b of the starter relay 32 in an open state, and disables automatic drive of the starter 11, and the transistor 33 becomes non-conductive in response to the energization signal. The normally closed contact 34b of the ignition relay 34 is maintained in a closed state, and the ignition coil 12c is enabled to be energized. Note that in a state where the automatic engine start/stop control is canceled in this way, the engine will not start unless the ignition switch 13 is operated.

By the way, in the state in which the flag F8 is reset in step 55 when the vehicle and engine are temporarily stopped, the speed sensor 16 may fail due to breakage of the speedometer drive cable 16c, etc., and the traveling speed of the vehicle may decrease. It is assumed that it is no longer detectable. In this state, the ignition switch 13 closes the movable contact 13a.
When the fixed end (27) is operated to connect to the child 13c, the starter 11
receives power from the DC power supply 10 and starts the engine in cooperation with the ignition circuit 12, and in response, the regulator relay 15 generates a high voltage H1 under the control of the alternator 14. Then, when the main control program proceeds to step 42 with the door of the vehicle closed and the door signal from the door switch 19 extinguished and the set switch 17 generating a set signal by its operation, (! The PU determines l-ymsJ based on the reset result in step 55, determines l'-YESJ based on the establishment of the set condition in step 43, sets flag F2 in step 44, and determines l'-YESJ in step 43.
In step 5, the flag IFI is reset, and in step 46, "
YBF3J is determined and the main control program is executed in step 42.
Return to After that, the CPU determines "NO" in step 42 based on the set result in step 44, and determines "NO" in step 52 based on the extinction of the door signal and the set signal, and executes the main control program. The process passes through step 46 (28) and returns to step 42, and thereafter the rotation state of the engine is maintained by repeating this process.

When the vehicle starts in such a state by operating its starting operation mechanism, no speed pulse is generated from the speed sensor 16 even though the output shaft of the power transmission device of the vehicle is rotating. The reed switch 16b remains open or closed, and continues to generate a high level signal or a low level signal. Further, at this time, the flag F1 remains reset regardless of the execution of the interrupt control program. For this reason, even while the vehicle is running, (!PU is not activated in step 42.
By repeating the execution of the control program that sequentially passes through steps 52 and 46, the rotational state of the engine is forcibly maintained.

On the other hand, when the car is stopped and the ignition switch 13 is turned on, the diagnosis switch 25 is set to 0.
If the power is turned on for more than 5 seconds, the microcomputer 20 switches to the self-diagnosis state, stops the calculation process of automatic start/stop control, and the judgment in step 58 (29) of the self-diagnosis judgment becomes YES, and the calculation of the self-diagnosis routine 100 starts. Repeat the process.

In this self-diagnosis routine 100, as shown in FIG. 4, the starter 11 is turned off in step 102, and the set switch 17, first clutch switch 18a, second clutch switch 18b, door switch 19, etc. are input in step 103. Headlight switch 23. right turn switch 2
Each switch signal from 4 is input and temporarily stored in RA and M. After that, the process proceeds to judgment step 104, in which the predetermined standard state of non-operation, that is, the state of each switch, is compared and verified with a 6-bit standard signal corresponding to 1 bit of 0 or 1, and the switches that differ from the standard state are compared. When the number of signals is 0 or an even number, the process proceeds to step 105 to turn off the lamp 26, and thereafter the same calculation is repeated to keep the lamp 26 in the off state.

Subsequently, when only one switch, for example the right turn switch 24, is turned on, the above determination step 1 is performed.
The judgment of 04 is an odd number, so STELLA/30) Proceeds to step 106 and lights up the lamp 26. By this lighting, it is possible to diagnose and confirm that the signal input line of the right turn switch 24 is normal.

Similar to this diagnosis, headlight switch 23 door switch one, first. Second clutch switch 18a, 18b
Regarding the diagnosis of each signal input line of the set switch 17, it is possible to check whether the lamp 26 is lit or not and whether it is normal or not by operating the individual switches in sequence.

Now, for example, if the signal input line of the door switch 19 is out of order, by operating each switch in sequence, the lamp 26 will remain off only when the door switch 19 is operating, and the faulty part will be connected to the door switch. 19 can be diagnostically confirmed.

Also, 1st. When diagnosing the second clutch switch 18a18b, when the clutch pedal starts to be depressed, the second clutch switch 18'b is activated and the lamp 26 lights up.
Subsequently, when the clutch pedal is fully depressed, both the second clutch switch 18'b and (31) first clutch switch 18a are activated, so that the lamp 26, which was previously on, turns off, causing the first clutch switch to turn off. 1 clutch switch 18a can be diagnosed.

Note that in the above embodiment, the diagnosis switch 25
Although the self-diagnosis is performed by manual operation of the
The diagnosis switch 25 may be omitted so as to switch to self-diagnosis by determining multiple operations within a short period of time (2 to 3 seconds).

Further, in the above practical gli example, an example in which the present invention is applied to an automobile gasoline engine has been described, but the present invention is not limited to this, and the present invention can also be applied to an automobile diesel engine. Therefore, in this case, instead of the ignition speed M:512, a fuel injection amount control means for controlling the injection of fuel into the diesel engine is adopted, and this fuel injection amount control means is connected to the closing/closing contact of the ignition relay 34. What is necessary is to stop fuel injection when 34b opens (32).

Further, in the above embodiment, an example was explained in which the vehicle speed sensor 16 was constituted by the disc 16a provided on the speedometer drive cable 16a and the reed switch 16c, but the present invention is not limited to this, and instead of the reed switch 16b. It may be carried out by adopting an appropriate ω flux detection means, or it may be carried out by adopting a disk having a slit and a photocoupler instead of the disk 16a and the reed switch 16b, and in these cases , the disk may be connected not only to the drive cable 16c but also to a rotating member that rotates in accordance with the traveling speed of the automobile.

As described above, according to the present invention, it is possible to determine the suitability of failures of various detection switches and their signal lines for detecting driving operations necessary for automatic start/stop control with a simple configuration. This has an excellent effect in that when a failure occurs, the failure part can be easily confirmed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, (33
) FIGS. 2, 3, and 4 are flowcharts showing the operation of the microcomputer shown in FIG. 1, respectively. 11... Starter, 12... Ignition circuit. 13... Ignition switch, 16... Speed sensor, 17... Set switch, 18a... First clutch switch, 18b... Second clutch switch. 20...Microcomputer, 23...Headlight switch, 24...Right turn switch, 25...Diagnosis switch, 26...Lamp. Representative patent attorney Takashi Okabe (34)

Claims (1)

[Scope of Claims] Automatic start of an engine for an automatic bicycle, which stops the engine when the car stops, and automatically starts the engine in conjunction with the operation of various detection switches that detect the start operation when the car starts. In the stopping method, when the conditions for switching from the normal control state to the self-diagnosis state are determined, the process switches to the calculation process of the self-diagnosis program, inputs the switch signals of the various detection switches described above, and returns to the predetermined standard state of non-operation. A method for automatically starting and stopping an automobile engine, characterized in that it determines whether the number of different switch signals has changed compared to