JPS5818539A - Automatically starting and stopping method of automobile engine - Google Patents

Abstract

PURPOSE:To effectively perform automatic operation, by automatically flowing an electric current in a starter circuit responsively to operation of a start control mechanism and restarting an engine in case of a sudden stop of the engine in a travelling condition of an automobile when its running speed is not higher than a prescribed value. CONSTITUTION:If a movable contact 13a of an ignition switch 13 is successively connected to fixed terminals 13b, 13c, an engine is started by a starter 11, and high voltage is generated in a regulator relay 15 under control of an alternator 14. If a start of the engine is detected, a starter relay 32 is deenergized to stop the starter 11. Then an automobile is driven, when its running speed is at least a prescribed value, in case of a sudden stop of the engine, though an electric conduction current is cut off flowing in a starter circuit by a microcomputer 20, when said running speed is not higher than the prescribed value, in case of a stop of the engine, the starter circuit is automatically conducted with an electric current, and the engine is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically starting and stopping an automobile engine, and in particular, for automatically starting the engine when the automobile starts, and after starting the automobile, the automobile is in a running state. The present invention relates to a method for automatically starting and stopping an automobile engine, which maintains the rotation of the engine based on certain conditions and stops the engine when the automobile stops.

Conventionally, in this type of automatic start/stop method, when starting a car engine, the starter of the engine is automatically energized and driven in response to depression of the car's clutch pedal. When the starter starts, it is detected and the power to the starter is cut off to stop the starter.

In such an automatic start/stop method, the engine
If the vehicle stops for some reason while the vehicle is running, the starter may be automatically energized by pressing the clutch pedal to drive the starter and restart the engine. By the way, in such a case, by releasing the clutch pedal while maintaining the transmission of the vehicle at a shift position other than the neutral position (for example, the first gear position), the engine is switched to the vehicle through the transmission. If connected to the drive wheels, the engine will be rotated by both the drive wheels and the starter. Therefore, if the clutch pedal is quickly released as described above when the vehicle is running at a relatively high speed, the engine rotational speed will rise rapidly along with the rotational speed of the drive wheels, unlike that of the starter. As a result, the pinion installed on the output shaft of the starter may mesh smoothly with the ring gear installed on the engine flywheel, which may cause noise such as gear noise to occur at the connection between the starter and the engine, such as the pinion or ring gear. The problem arose that overgrowth caused damage. This is particularly noticeable when the engagement timing of the □ pinion with the ring gear almost coincides with the rapid release timing of the clutch pedal.

In addition, in such an automatic start/stop method, when detecting depression of the clutch pedal as described above,
:The clutch switch is installed at the fully depressed position of the clutch pedal, but if the clutch switch is not installed accurately, the clutch switch may be activated before the clutch pedal is fully depressed. There was a tendency for the detection to occur as if the clutch pedal had been depressed. For this reason, if the second engine is connected to the starter while being connected to the drive wheels, and if the clutch pedal is quickly released when the vehicle is running at a relatively high speed, the above-mentioned case can be avoided. Substantially similar problems arose.

The present invention has been made with attention to this problem, and its purpose is to prevent the vehicle from starting if the engine stops when the vehicle is running at a speed greater than a predetermined value. Regardless of the operation of the operating mechanism, the power to the starter circuit remains cut off, and if the engine stops while the traveling speed is below the predetermined value, the starter circuit is automatically switched on in response to the operation of the starting operating mechanism. An object of the present invention is to provide a method for automatically starting and stopping an automobile engine in which electricity is supplied automatically.

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 via 16. When the ignition switch 16 is operated to temporarily connect the movable contact 13a to the fixed terminal 13c, the RuriTori 11 is supplied with power from the DC power supply 10 and starts, putting the engine in a cranking state. . The ignition circuit 12 is a control circuit 12 connected to a signal generator provided in the Encinno distributor.
a, and an ignition coil 12C connected to a control circuit 1217 via a transistor 12b. Transistor 12b becomes conductive under the control of control circuit 12a in response to generation of a signal from the signal generator and becomes non-conductive in response to disappearance of the signal from the signal generator. Ignition coil 12C is W source 1”0
In response to the conduction of the transistor 121), it is energized in a state where it can receive power from the transistor 12b, and is cut off from the energized state in response to the non-conduction of the transistor 12b, thereby generating a spark voltage and applying it to the distributor.

The alternator 14 is connected between the DC power supply 10 and the regulator V-tary relay 15, and when driven by the engine generates an AC voltage at the neutral point N of its stator coil and converts it into a DC voltage. DC power supply 1
Supply to 0. The regulator relay 15 includes an electromagnetic coil 1512 connected between the neutral point N of the stator coil of the alternator 14 and a ground terminal 15c, and a ground terminal 15C.
Alternatively, a double-headed contact 151) connected to a fixed terminal 15d connected to the DC power supply 10 is provided. Therefore, when the electromagnetic coil 15a is in a demagnetized state, the double-headed contact 15b is connected to the ground terminal 15C, and a low voltage is applied from the output terminal. occurs. When the electromagnetic coil 15a is excited by the alternating current voltage generated at the neutral point N of the stator coil, the double-headed contact 1
5b is connected to the fixed terminal 15a and generates a high voltage H1 from the output terminal.

The microcomputer 20 has a regulator relay 15
, speed sensor 16, set switch 17, first clutch switch 18a1, second clutch switch 18b and door switch 19. The speed sensor 16 is composed of a disk 16a made of a permanent magnet and a reed switch 161:l arranged to form a magnetic relationship with each protrusion of this disk 16112. It is attached to a speedometer drive cable 16c connected to the output shaft of the automobile's power transmission device. When the disc 1612 rotates in conjunction with the drive cape/l/16C, the reed switch 16b sequentially detects each protrusion on the disc 16a and determines the actual running speed of the vehicle. In the present embodiment, the number of speed pulses generated from the speed sensor 16 is 1274 cm at a running speed of 60 A'l/h of the vehicle, and at a running speed of 60 A'l/h. 2548 progress (approx. 1
(corresponding to a 25m crown).

The set switch 17 is a normally open switch with a self-reset function, and is provided at a suitable location in the vehicle interior of the vehicle. Thus, the set switch 17 generates a set signal by temporarily closing it. The first and second clutch switches 18a and 181) are both provided on the clutch pedal of the vehicle, and the first clutch switch 18a is of a normally open type, and when the clutch pedal is fully depressed, the first Generates clutch signal. The second clutch switch 18b is of a normally closed type, and generates a second clutch signal when the clutch pedal is depressed.
The clutch signal is extinguished by releasing the clutch pedal. The door switch 19 is a normally closed type switch, which is installed on the door of the vehicle, generates a door signal when the door is opened, and extinguishes this door signal when the door is closed.

The microcomputer 20 is formed of an LSI, and becomes operational in response to a constant voltage (5) 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 "engine 10"), a read-only memory (hereinafter referred to as "ROM"), and a random access memory (hereinafter referred to as "RAM"). and a clock circuit are provided, and these C! PU,/. , ROM.

The RAM and clock circuits are connected to each other via pass lines. I/. are the low voltage Lo (or high voltage H1) from the regulator relay 15, each speed pulse from the speed sensor 16, the set signal from the set switch 17, and the first and second clutch switches 1817.181)
the first and second clutch signals from and the door switch 19
It receives the door signal from and adds it 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 necessary for the CPU to execute the flowcharts shown in FIGS. 2 and 3, and an interrupt control program necessary for the CPU to execute the flowchart shown in FIG. 4. has been done.

The CPU has an interrupt timer, which starts counting at the same time as the microcomputer is started, and when the measured value reaches 1m5e'c, 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 each time the measured value of the interrupt timer reaches 1 m5ec, the CPU stops executing the main control program and controls the interrupt. By executing the program and alternately executing the surface control program, various calculation processes are performed as described below, and the drive signal (or drive stop signal) and ignition necessary to drive (or stop) the starter 11 are executed. This generates the energization signal (or energization stop signal) necessary for energizing (or c) energizing the coil 120. In this case, the execution of the main control program by OP'H is repeatedly completed within 1Qmsec after its start.

In the microcomputer 20, a starter relay 32 and an ignition relay 34 each have a transistor 3.
1 and 36. transistor 31
is based on the microcomputer 20's engineering 10
It is connected to the fixed terminal 13b of the ignition switch 13 at its emitter, and conducts when it receives a drive signal from the CPU when the ignition switch 13 is closed, and when it receives a drive stop signal from the CPU. It becomes non-conductive. The transistor 6.3 is grounded at its emitter and connected to the circuit 10 at its base,
It becomes non-conductive after receiving a energizing signal from the CPU, and the CPU
It becomes conductive upon receiving a power stop signal from the terminal.

The starter relay 32 has an electromagnetic coil 1v5212 and a normally open contact 321), and the electromagnetic coil 3212 is grounded at one end, connected to the collector of the transistor 31 at the other end, and connected to the collector of the transistor 31 (DC power supply under the It is excited by receiving power from the transistor 10 and demagnetized in response to the non-conduction of the transistor 31.

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 excitation of i7 DC power supply 10 Color starter 1
1 and starts this starter 11. Further, the normally open contact 32b cuts off the power supply to the open starter 11 in response to the demagnetization of the electromagnetic coil A152a, thereby stopping it. Ignition L;-34 is electromagnetic coil/l/5
4a and a normally closed contact 34b, and an electromagnetic coil 3411
1 is connected between the fixed terminal 13b of the ignition switch 13 and the collector of the transistor 33, is demagnetized when the transistor 33 is non-conductive, and receives power from the DC power supply 10 in response to the conduction of the transistor 33. It is excited by The normally closed contact 341) is an electromagnetic coil.

When the coil 34a is in the demagnetized state, it closes to allow the DC power supply 10 to supply power to the ignition coil/L/12C, and opens in response to the excitation of the electromagnetic coil/L/34 (l) to allow the ignition coil/L/12C to Cut off the power supply.

In this embodiment configured as described above, when the ignition switch 16 is operated to connect the movable contact 1'5a to the fixed terminal 15b while the vehicle is stopped, the constant voltage circuit 21; It is supplied with power from the DC power supply 10 to generate a constant voltage, and in response to this, the microcomputer 20 becomes operational. At the same time, the CPH interrupt timer starts measuring time, and the CPU starts executing the main control program in step 40 according to the flowchart of FIG. Next, when the ignition switch 13 is operated to temporarily connect the movable contact 132 to the fixed terminal 130, the starter 11 receives power from the DC power supply 10 and starts the engine in cooperation with the ignition circuit 12. do. This time, regulator relay 15
generates high voltage H1 under the control of alternator 14. It is assumed that the reed switch 16t) is closed due to the magnetic relationship with the disc 16a when the vehicle is stopped.

In such a state, the main control block power! Step 4
1, the CPU initializes the contents of the microcomputer 20, marks the flag F8 by 1, and sets the flag F8 to 1.
1, the current + level of the speed nozzle of the speed sensor 16 ≧)V (At this stage, since the reed switch 16b is closed, It is assumed that the speed control is at a low level, and is at zero. ), the main part control program advances to step 42, and a determination is made 11 as to whether or not the flag pei: is in the reset state. In this case, the flag F8 indicates that a saint condition for setting the engine under automatic start/stop control has been met, and the saint condition is that the regulator relay 15 is generating high voltage H1. , the door signal power from the door switch 19 has disappeared, and the set switch 17
;The set signal is generated, and the above three requirements are satisfied at the same time.

As mentioned above, when the main control program proceeds to step 42 and the time value of the interrupt timer reaches 1msθC,
The CPU stops executing the main control program and starts executing the interrupt control program shown in the flowchart of FIG. 4 in step 60.

Next, the speed pulse from the speed sensor 16 (as described above, it is a low level signal) is stored in the RAM in step 61, and in the next step 62, the CPU determines whether this stored level is at high level. It is determined by However, in step 62, the CPU
NO", the interrupt control program advances to step 64, and it is determined whether flag F1=1.

Then, the CPU determines "No" in relation to the set level of the flag F1 in step 41 of the main control program, and in the next step 69, the count value C by the RAM 0 counter is 2 seconds (when the vehicle in question presses its brake pedal). It is determined whether the time required for the device to temporarily stop after operation has been reached. At the current stage, the count value C by the RAM counter is not 2θθC, so
The CPU determines "NO" and the count value C is determined in step 70.
By adding "1" to C, a new count value C is created, and the execution of the interrupt control program is ended. Note that the RAM0 counter is
The time during which the level of the speed pulse stored in the RAM does not change is counted in response to a clock signal from a clock circuit.

Further, the added value "1" by the RAM0 counter corresponds to the time (1m8θC) required to execute the interrupt control program.

As described above, when the execution of the interrupt control program is finished, OP and U determine "YES" in step 42 of the main control program based on the reset state of the flag Fs in step 41, and step the main control program. Proceeding to step 46, it is determined whether or not the set condition is met. Only 1
Therefore, at this stage, at least set switch 1
7 has not been operated, the CPU determines "NO" in step 43, and advances the main control program to step 47, where it determines whether or not a condition for stopping the starter 11 is satisfied. 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 CPU returns l"YESj in step 47.
The main control program returns to step 42 through step 48. It should be noted that during the execution of the main control block described above, the CPU detects that the time value of the interrupt timer is 1.
Each time m5ec is reached, execution of the main control program is stopped and steps 60, 61, 62, 6, and 62 are executed as described above.
4.69 Interrupt control flow passing through 70 and 71 sequentially.

The program is being executed repeatedly.

While each of these control programs is being executed, 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 set signal by its temporary operation. When the main control program reaches step 43, the CPU generates the high voltage H1 from the regulator relay 15, the set signals from the set switch 17, and the door switch 1.
Based on the disappearance of the door signals 9) and 9), the determination is ``YES'', and the main control program is further advanced to set the flag Fll in step 44. Main control program power: Proceeding to step 45, the CPU determines whether the engine is stopped. The CPU then determines that the high voltage H1 from the regulator relay 15 is rN'oj, and in the next step 50, determines whether the engine stop condition is satisfied. In this case, the engine stop condition is based on the simultaneous fulfillment of two requirements: the second clutch + (= sign from the second clutch switch 181) disappears, and the count value C by the RAM counter is 2eθC. Holds true.At this stage, assuming that the count value C is not 2 seconds, the CPU
The determination in step 50 is "NO", and the main control program returns to step 42.

As mentioned above, the main control program steps.

Returning to step 42, the CPU determines "NO" based on the result of setting the flag I+'6 in step 44, and determines whether or not the cancellation condition for canceling the engine from under automatic start/stop control is met in step 49. Proceed with the main control program. In this case, the cancellation conditions are
Generation of door signal from door switch 19 or flag FB
This is established by satisfying the requirement that a set signal is generated from the set switch 17 under the setting of . However,
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 l'-Nol in step 49 and executes the main control program in step 45.50. through the process and return to step 42.

In such a state, when the vehicle starts by operating its starting operation mechanism, the traveling speed of the vehicle V (3
0''/) is detected as a speed pulse by the speed sensor 16 and applied to the microcomputer 20. At this stage, the CPU executes the main control program in response to the clock value from the interrupt timer. When the execution of the interrupt control program is started at step 60, the speed pulse from the speed sensor 16 is R at the next step 61.
Stored in AM. When the interrupt control program proceeds to step 62, the 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, the CPU selects “YK
sJ, the interrupt control program advances to step 63, and it is determined whether the flag Fl is at a high level, that is, 1. Therefore, the CPU executes "
NO", the interrupt control program advances to step 65, and the flag Fl-1 is set. When the interrupt control program passes step 67 and proceeds to step 68, the CPU
, resets the content C of the counter provided in the RAM, and ends the execution of the interrupt control program in step 71.

After that, if the interrupt control program is executed again in the same way as in the case described above, the speed pulse from the speed sensor 16' (traveling speed v (50 kl/, therefore, it is a high-level groove) ) is stored in the RAM at step 61.Then, the CPU stores "YESJ" at step 62.
After determining ``YESJ'' in step 63 based on the set result that is OK in step 65, in relation to the reset result in step 68, in step 69, ``YESJ'' is determined.
If the answer is NO, the count value C of the RAM0 counter is updated to 1 in step 70, and the execution of the interrupt control program is ended.

Thereafter, while repeating the execution of the main control program which sequentially passes through steps 42, 49, 45 and 50, and the execution of the interrupt control program which passes sequentially through steps 62, 63, 69 and 70, the When the speed pulse falls to a low level, the CPU determines "NOJ" at step 62 of the interrupt control program, and determines whether the flag Fl is set to "1" at the next step 64. . However, the CPU
In relation to the set result (1”1=1) in 5, “y
msJ, the interrupt control program advances to step 66, and the flag F1 is set to "0".

Thereafter, when the interrupt control program proceeds to step 67,
The CPU calculates the traveling speed (■) of the vehicle based on the addition count value C in the immediately preceding step 70 for which the CPU determined "NO" in the step 62. In other words, the CPU calculates the traveling speed v ( v (3
0''VB). When the interrupt control program proceeds to step 68, the C!PU resets the count value C of the counter in the RAM.

If the engine suddenly stops for some reason while the vehicle is running, the regulator relay 15 generates a low voltage, Lo, under the control of the alternator 14, while the driver presses the clutch pedal. When the first clutch switch 18a is depressed, a first clutch signal is generated from the first clutch switch 18a. Therefore, when the main control program reaches step 45, the CPU
Low voltage from 5. It is determined "YES" in relation to
Starter drive condition determination routine 4 for main control program
6 (see FIG. 6), and in step 46a, it is determined whether or not the traveling speed of the vehicle is 30 kHz or more. Then, the CPU determines "NO" based on the calculation result V in step 67 of the interrupt control program, advances the main control program to step 461), and determines whether the starter drive condition is 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 L0, and the first clutch switch 18a is generating the first clutch signal 41. .

As mentioned above, when the main control program reaches step 46b, the CPU detects the low voltage from the regulator relay 15. Based on the first clutch signal from the first clutch switch 18tl, it is determined that yEsJ, and the main control program proceeds to step 46c to generate a drive signal.Then, the transistor 31 responds to the drive signal from the CPU. The conductive starter relay 32 closes the normally open contact 32b by excitation of the electromagnetic coil 5217, drives the starter 11, starts the engine, and maintains the vehicle running smoothly.At this time, the regulator relay 15 starts the engine. High voltage H1 under the control of alternator 14 by
occurs.

As can be understood from the above explanation, if the engine suddenly stops while the vehicle is running at less than 1 krt7., the first clutch switch 18 (from l to When the first clutch signal is generated, the starter drive condition is satisfied, and the starter 11 automatically starts the engine by driving the first clutch signal to maintain the smooth running condition of the vehicle.In this case, the transmission of the vehicle If the engine is connected to the drive wheels of the vehicle via the transmission by releasing the clutch pedal with the engine in a shift position other than the neutral position (for example, the first gear position), the drive wheels and the starter 1
The engine will be rotated by both of 1,
The rotational speed of the driving wheels defined by the traveling speed of the vehicle (less than 50%) is low, and therefore even if the multi-latch pedal is released rapidly, the resulting rotational speed of the engine is low. The rate of increase is low. As a result, the meshing timing of the pinion installed on the output shaft of the starter 11 with the ring gear installed on the engine flywheel is
Even if the depression of the clutch pedal almost coincides with the rapid release, the pinion can smoothly mesh with the ring gear regardless of the rate of increase in engine rotational speed, so that the starter 11 such as the pinion or ring gear and the engine It will not generate noise such as gear noise or cause damage to the connecting parts. Furthermore, in this case, if the mounting position of the first clutch switch 18a is not accurate and the first clutch signal is generated from the first clutch switch 18a before the clutch pedal is fully depressed, the engine will not rotate due to the connection with the drive wheels. In this state, the starter 11 is connected to the engine due to its driving. However, due to the reason mentioned above, the increase rate of the engine rotational speed is low, so the connection between the starter 11 and the engine is made smoothly, and the above-mentioned noise is generated. It will not cause any damage or damage.

Therefore, when the main control program proceeds from step 46C to step 47 of the starter drive condition determination routine 46, the CPU detects the high voltage H1 from the regulator relay 15.
Based on this, it is determined as ``YESJ'' and a drive stop signal is generated in step 48. As a result, the transistor 61 becomes non-conductive, opening the normally open contact 52b of the starter relay 62, and stopping the starter 11 while maintaining the rotation of the engine. .

In addition, in the above explanation, if the calculation result ■ obtained in step 67 of the interrupt control program is 30 to 51 or more, when the main control program reaches step 46 (2), the CPU The main control program proceeds to step 46 (l) to generate a drive stop signal. As a result, the transistor 31 maintains a non-conducting state in response to the drive stop signal from the CPU, and the starter relay 32 is normally open. The contact 62'b maintains the open state to maintain the starter 11 in the stopped state.In other words, while the vehicle is running at a speed of 50'/i or more, the engine stops for some reason. If the engine suddenly stops, the starter 11 is maintained in the stopped state under the control of the transistor 31 and the starter relay 32 even if the first clutch signal is generated from the first clutch switch 18a by depressing the clutch pedal. Therefore, in such a situation, by releasing the clutch pedal while the transmission of the vehicle is in a shift position other than the neutral position (for example, the first gear position), the engine is shifted through the transmission. When connected to the driving wheels of an automobile, the engine receives the rotational force of the driving wheels without being connected to the starter 11 and starts under the control of the ignition circuit 12, thereby maintaining the smooth running state of the automobile. ,At this time,
Even if the rate of increase in engine speed increases rapidly by rapidly releasing the clutch pedal, the engine and starter 11 are not connected, which prevents noise such as gear noise or damage at the connection between the two. can be prevented.

In such a driving state of the vehicle, if the brake pedal is operated to temporarily stop the vehicle at an intersection etc., the vehicle will decelerate while repeating the execution of the main control program and interrupt control program as described above. The engine stops with the clutch pedal depressed, and then the clutch pedal is released. At this time, the speed sensor 16
The velocity pulses originating from this disappear. Therefore, when the addition result C in step 70 reaches 2eec, C
The PU determines "YES" in step 69, and ends the execution of the interrupt control program in step 71. Therefore, when the main control program proceeds to step 50, C
The PU determines "YES" based on the release of the clutch pedal and the determination result in step 69, and proceeds to the next step 5.
1 generates an energization stop signal. Then transistor 6
6 becomes conductive in response to the energization stop signal from gPU, and the ignition relay 34 is energized by the electromagnetic coil) v 34 a, normally closed point i 34 bt-open,! Ignition carp/
Stop power to I/12c. As a result, the engine stops and the regulator relay 15 generates a low voltage LO.

When the main control program proceeds to step 47, the CPU
It is determined as YESJ, a drive stop signal is generated in the Stella 6148, and the main control program returns to step 42. After that, the CPU determines "YES" in step 45, and determines "NO" in step 462 based on the traveling speed obtained in step 67 immediately before the vehicle is temporarily stopped.
In step 46t), it is determined "NO" in relation to the release of the clutch pedal, and the main control program is changed to step 46t).
Proceed to step 48 through d.

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 46.
When the process proceeds to step 1), the CPU determines l''YKSJ and generates a drive signal in step 46C.Then, the transistor 31 becomes conductive in response to the drive signal from the CPU, and the starter relay 62 turns on the electromagnetic coil /L/ 32a closes the normally open contact 521) and drives the starter 11 to start the engine.At this time, the regulator relay 15
generates high voltage H1 under the control of alternator 14 by starting the engine. When the main control program proceeds to step 47, the CPU determines that the high voltage H1 from the regulator relay 15 is "YKSJ" and generates a drive stop signal in step 48. As a result, the transistor 31 Starter relay 3 becomes non-conductive.
The normally open contact No. 2 is opened to stop the starter 11. Thereafter, the vehicle starts by operating its starting operation mechanism.

Additionally, if you open the door of the vehicle while the vehicle and engine are temporarily stopped, as described above.

A switch 19755 generates a door signal. However,
When the main control program proceeds to step 49 in such a state, the CPU proceeds to step 52 and sets the flag F based on the generation of the door signal.
Reset s. Thereafter, the CPU generates a drive stop signal in step 53, and generates an energization signal in step 54. 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 341 of the ignition relay 34 is kept closed, and the ignition coil 12
Enables energization to 0. Therefore, 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.

In the above embodiment, 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. In this case, instead of the ignition circuit 12, a fuel injection amount control circuit for controlling the amount of fuel injected into the diesel engine is adopted, and this fuel injection amount control circuit is connected to the normally closed contact 5 of the ignition relay 64.
41) is opened, fuel injection may be stopped.

Further, in the above embodiment, the first clutch switch 1
Although the example in which the first clutch switch 18a is disposed on the clutch pedal of the vehicle has been described, when implementing the present invention in a vehicle equipped with an automatic transmission, the first clutch switch 18a may be disposed in the neutral position of the automatic transmission. good.

Further, in the above embodiment, the criterion for determining the traveling speed in step 46a is set to 30 to 2, but the criterion is not limited to this and may be changed as appropriate.

Further, in the above embodiment, an example was explained in which the engine is automatically stopped when the vehicle is stopped, but instead of this, for example, a one-touch manual operation switch may be adopted to detect this when the vehicle is stopped. At the same time, the engine may be stopped by manually operating the one-touch manual operation switch.

As explained above, in the method for automatically starting and stopping an automobile engine according to the present invention, as exemplified in the above embodiment, the engine is stopped when the running speed of the automobile is equal to or higher than a predetermined value. In this case, the power supply to the starter circuit is kept cut off regardless of the operation of the start operation mechanism of the vehicle, and if the engine stops when the traveling speed is below the predetermined value, the start operation mechanism is not operated. Its structural feature is that it automatically energizes the starter circuit in response.
Thereby, the problem mentioned at the beginning of this specification can be effectively solved.

[Brief explanation of drawings]

FIG. 1 is a professional diagram showing an embodiment of the present invention, and FIG.
4 to 4 are flowcharts showing the operation of the microcomputer shown in FIG. 1, respectively. Explanation of symbols 11... Starter, 12... Ignition circuit,
16... Ignition switch, 16... Speed sensor, 17... Set switch, 18a... First clutch switch, 18°b... Second clutch switch, 20... Microcomputer, 31° S6...
Transistor, 32...Starter relay, 34...
ignition relay. Applicant: Nippondenso Co., Ltd. (and 1 other person) Agent: Chief Patent Attorney Yong -

Claims (1)

[Claims] Automatically energizes a starter circuit provided in the engine of the vehicle in response to an operation of a starting operation mechanism when starting the vehicle, and automatically energizes an ignition circuit or a fuel injection amount control circuit provided in the engine. The engine is started, and when the engine starts, it is detected and power to the starter circuit is cut off, and after the car starts, it is detected that the car is in a running state, and based on this detection result. Based on this, when the engine is stopped while the ignition circuit or the fuel injection amount control circuit is kept energized and the speed of the vehicle is above a predetermined value while the vehicle is running, the start operation mechanism is operated. Regardless, if the engine is stopped while the running speed is below the predetermined value, the starter circuit is automatically switched off in response to the operation of the start operation mechanism. 1. A method for automatically starting and stopping an automobile engine, the method comprising applying electricity, and stopping the engine by cutting off electricity to the ignition circuit or the fuel injection amount control circuit when the automobile stops.