JPS5820946A - Method of automatic starting and stopping for automobile engine - Google Patents

Abstract

PURPOSE:To smooth the automatic starting and stopping by a method wherein the engine is stopped and a part of fuel supply circuit is closed upon stopping the automobile engine while the closing of the circuit is released when a predetermined time elapsed after the fuel is interrupted to fill the circuit with the fuel before starting the engine. CONSTITUTION:Stopping of an electric power supply for a solenoid valve 36 is maintained to keep the closed condition thereof untill an interrupting time C has elapsed 0.4sec or more after the stopping of the power supply for the solenoid valve 36 upon stopping the engine and whereby unnecessary consumption of the fuel during stopping of the engine 10 is restrained to the minimum. When the interrupting time C has become more than 0.4sec, the solenoid valve 36 is opened by receiving the power supply therefor and the fuel from a fuel supply source 10b is flowed into a pipeline P2, a carburettor 10a and the suction pipe of the engine 10 whereby the fuel is supplied smoothly into the combustion chamber of the engine 10 simultaneously with the beginning of the starting revolution thereof and the engine 10 may accomplish the starting thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for automatically starting and stopping an automobile engine, in particular, the engine is automatically started when the automobile starts, and after the automobile is started, 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 and stops the engine when the automobile stops.

Conventionally, in this type of automatic start/stop method, a solenoid valve is inserted in a part of the connecting pipe that connects the capretor installed in the car engine to the fuel supply source, and the car starts automatically or manually. When the engine is stopped by operation, when a predetermined engine stop condition is met, the engine is stopped, and at the same time as the engine stop condition is met, a part of the connecting pipe is closed by the solenoid valve, and the carburetor is stopped. is cut off from the fuel supply source, and when the engine stop condition is not satisfied when the vehicle is started, the closed state of a part of the connecting pipe is released by the solenoid valve and the engine is started at the same time. There is.

By the way, in such an automatic start/stop method, the engine does not stop instantaneously at the same time as a part of the connection pipe is closed as described above, and even after such closure, the engine does not suddenly increase its rotational speed. It is rotating even though it is lowering. Therefore, when a portion of the connecting pipe is closed, the fuel existing in the carburetor side portion of the connecting pipe located between the electromagnetic valve and the combustion chamber of the engine, the carburetor, and the intake pipe of the engine. However, as the engine rotates after the above-mentioned part of the connection pipe is closed, it is introduced into the combustion chamber and is consumed.

However, the fuel from the fuel supply source is blocked by the solenoid valve and cannot flow into the carburetor side portion of the connecting pipe, the carburetor, and the intake pipe of the engine, and as a result, when the engine is started, Even if a part of the connection pipe is unclosed by the electromagnetic valve, fuel cannot be introduced into the combustion chamber at the same time as the engine starts rotating, resulting in a problem that the engine starts poorly. was occurring.

The present invention 1 was made by paying attention to the above points,
The purpose of this is to stop the engine when the vehicle is stopped, and also to close part of the fuel supply circuit that supplies fuel from the fuel supply source to the engine, thereby cutting off the engine from the fuel supply source. A method for automatically starting and stopping an automobile engine in which a part of the fuel supply circuit is unclosed when a predetermined period of time has elapsed, and the fuel supply circuit is filled with fuel from a fuel supply source before starting the engine. Our goal is to provide the following.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. Connected to B. Therefore, the ignition switch 13 connects the movable contact 13B to the fixed terminal 13.
When operated to temporarily connect to the starter 11
is supplied with power from DC power supply B and starts the engine 10.
Leave it in cranking condition. The ignition circuit 12 is
A control circuit 12a connected to a signal generator installed in the distributor of the engine 10, and a transistor 12.
The ignition coil 1/120 is connected to the control circuit 12a via the ignition coil 12a. Under the control of the control circuit 12&, the transistor 12b becomes conductive 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/L/120 is in a state where it can receive power from the DC power source B, and is energized in response to the conduction of the transistor 12b, and is cut off from the energized state in response to the non-conduction of the transistor 12b, generating a spark voltage and distributing the electricity. granted to.

Alternator 14 is DC power supply B and regulator V-1
When driven by the engine 10, it generates an alternating current voltage at the neutral point N of the stator coil μ, converts it into a direct current voltage, and supplies it to the direct current power source B. The regulator relay 15 is connected to the alternator 14
The electromagnetic coil #15a is connected between the neutral point N of the stator coil and the ground terminal 150, and the double-headed contact 15b is connected to the ground terminal 150 or a fixed terminal 15d connected to the DC power supply B. However, electromagnetic carp/l'15
When a is in the demagnetized state, the double-headed contact 15b is connected to the ground terminal 1.
50 to generate a low voltage Lo from the output terminal. The electromagnetic coil /l/15a is the neutral point N of the stator coil μ
When excited by the alternating current voltage generated in the double-headed contact 15b
is connected to the fixed terminal 15d and high voltage H is applied from the output terminal.
generate i.

Microcomputer 20id, regulator relay 1
5. Speed sensor 16. Set switch 17° is connected to first clutch switch 18a, second clutch switch 18b and door switch 19. The speed sensor 16 is
It is composed of a disc 16a made of a permanent magnet and a reed switch 1'6b arranged to form a magnetic relationship with each protrusion of the disc 16a. It is attached to the Nupedometer drive cape/l/160 connected to the output shaft of the power transmission device.

When the disc 16a rotates in conjunction with the drive caps lV and 16G, the reed switch 16b is activated by the disc 1t5a.
Each protrusion is sequentially detected and generated as a series of speed pulses corresponding to the actual traveling speed of the vehicle.

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 18b 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 shift latch 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, and disappears when the clutch pedal is released. The door switch 19 is a normally closed type switch, which is installed on the door of the automobile, generates a door signal when the door is opened, and dissipates the door signal when the door is closed.

The microcomputer 2o is formed of an LSI and becomes operational in response to a constant voltage (5V) generated from a constant voltage circuit 21 by power supply from a DC power supply B when the ignition switch 13 is closed. The microcomputer 2o includes a central processing unit (hereinafter referred to as CPU).
, an input/output device (hereinafter referred to as 110), a read-only memory (hereinafter referred to as ROM), a random access memory (hereinafter referred to as RAM), and a clock circuit are provided, and these CPU, Ilo, and ROM.

The RAM and clock circuits are connected to each other via pass lines. The workpiece 10 includes a low voltage Lo (or high voltage Hi) from the regulator relay 15, each speed P/V from the speed sensor 16, a set signal from the set switch 17, and first and second clutch switches 18a and 18b. The first and second clutch signals from the door switch 19 and the door signal from the door switch 19 are received and applied to the RAM. The clock circuit is connected to a crystal oscillator 22, and this crystal oscillator 2
2) generates 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, which starts counting at the same time as the microcomputer is started, and when the measured value reaches / m SeC, it is reset and starts counting again. Therefore, 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 /m5ec, the CPU stops executing the main control program and interrupts. By executing the control program and alternately executing the re-control program, various calculation processes are performed as described below, and the drive signal (or drive stop signal) necessary to drive (or stop) the starter 11 is ), and a power supply signal (or power supply stop signal) necessary for power supply (or power supply stoppage) to the ignition coil/I/120 and the solenoid valve 36. In this case, the execution of the main control program by the CPU is repeatedly completed within /Om sec after its start.

A starter relay 32 is connected to the microcomputer 20 via a transistor 31. The transistor 31 is connected at its pace to Ilo of the microcomputer 20 and at its emitter to the fixed terminal 13b of the ignition switch 13, and receives a drive signal from the CPU when the ignition switch 13 is closed. It becomes conductive and becomes non-conductive upon receiving a drive stop signal from the CPU. The starter relay 32 has an electromagnetic coil 52& and a normally open contact 32b.
2a is grounded at one end, connected to the collector of the transistor 61 at the other end, is excited by receiving power from the DC power supply 10 while the transistor 31 is conducting, and is demagnetized in response to the non-conducting of the transistor 31. . The normally open contact 3'2b of the starter relay 32 is connected between the DC power supply 10 and the starter 11, and closes in response to the excitation of the electromagnetic coil/L'32a to stop power supply from the DC power supply 10 to the starter 11. Allow this starter 11 to start. 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/I/32a to stop it.

Further, an ignition relay 34 and a fuel cut relay 35 are both connected to the microcomputer 20 via a transistor 33.

The emitter of the transistor 53 is grounded and connected to the sono-2 terminal I10, and becomes non-conductive upon receiving a power supply signal from the CPU, and becomes conductive upon receiving a power supply stop signal from the CPU. The ignition relay 34 consists of an electromagnetic coil/L/34a and a normally closed contact 64b.
154 & is the fixed terminal 13 of the ignition switch 13
B is connected between B and the collector of the transistor 33, and is kept in a demagnetized state when the transistor 33 is non-conductive, and is excited by receiving power from the DC power supply B in response to the conduction of the transistor 33. The normally closed contact 54'i) is an electromagnetic coil/
When I/34a is in a demagnetized state, it closes to allow power supply to ignition coil A/120 from DC power supply B, and opens in response to excitation of electromagnetic coil 1v34a to cut off power supply to ignition coil/L'120.

The fuel cut relay 35 consists of an electromagnetic coil/935& and a normally closed contact 35b, and the electromagnetic coil/1/35a is connected to the fixed terminal 13b of the ignition switch 13 and the transistor 33.
is connected between the collectors of the transistor 35 and is demagnetized when the transistor 35 is non-conducting, and is energized by receiving power from the DC power supply B in response to the transistor 33 being conductive. The normally closed contact 35b is connected between the fixed terminal 13b of the ignition switch 13 and the solenoid valve 36, and closes to allow power to be supplied from the DC power source B to the solenoid valve 36 when the solenoid coil 55& is in a demagnetized state. Also, electromagnetic carp/' 3
5a opens to cut off power supply to the solenoid valve 36.

The solenoid valve 66 is a normally closed type, and the pipe Pl is connected to the inlet of the solenoid valve 66.
The fuel supply source iob is connected to the fuel supply source iob through a pipe 55P2, and the outlet thereof is connected to the capretor 10a1 through a pipe 55P2. In addition, the solenoid valve 36 is a solenoid coil IV! 16a, and this electromagnetic coil A/56a is a DC power source B.
Power is supplied from the ignition switch 13 and the normally closed contact 35b of the fuel cut relay 35 to excite the fuel, and when the ignition switch 13 or the normally closed contact 35b opens, it is cut off from the DC power source B and demagnetized. Thus, the solenoid valve 36 opens in response to the excitation of the electromagnetic coil/I/36a and connects the pipe P2 to the fuel supply source 10b.
The supply of fuel (gasoline in this embodiment) to the carburetor 10B is permitted. Further, the solenoid valve 36 cuts off communication between the closed pipes P2 and 11 in response to demagnetization of the solenoid coil/v36a.

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 21 is connected to the DC power source B. The microcomputer 2 is supplied with power and generates a constant voltage.
0 is the operating state. At the same time, the interrupt timer of the CPU starts counting time, and the CPU starts executing the main control program in step 40 according to the flowchart of FIG. At this time, the ignition coil 12c enters a state of receiving power from the DC power supply B through the ignition switch 13 and the normally closed contact 34b of the ignition relay 34.

In addition, the electromagnetic coil l 36 a of the electromagnetic valve 36 is connected to the DC power source B.
Power is received from the ignition switch 13 and the normally closed contact 35b of the fuel cut relay '55 to become excited, and the solenoid valve 36 opens due to the excitation of the electromagnetic coil/L'36 &, thereby communicating the pipe P2 with the pipe Pl. let This results in
Capretor 10a receives fuel from fuel supply source 10b through line PIs solenoid valve 36 and line P2 and supplies it to the engine as needed. Next, when the ignition switch 13 is operated to temporarily connect the movable contact 13a to the fixed end, terminal 13C, the starter 11 receives power from the DC power supply B in cooperation with the take-ignition circuit 12. Start the engine. At this time, the regulator relay 15 is set to high voltage Hi under the control of the alternator 14.
occurs. The 16-bit reed switch is assumed to be closed due to the magnetic relationship with the disk 16a when the vehicle is stopped.

When the main control program proceeds to step 41 in this state, the CPU initializes the contents of the microcomputer 20, resets the flag Fs, and sets the flag F1 to the actual level P (current level) of the speed pulse from the speed sensor 16. At this stage, the reed switch 16b is closed, so the speed pulse that should be generated from the reed switch 16b is at a low level, that is, zero.)
The main control program advances to step 42, and the flags F, s
is in a reset state.

In this case, the flag Fs indicates that a set condition for setting the engine under automatic start/stop control is satisfied, and this set condition is set by the regulator relay 15.
This is established when the above three requirements are met simultaneously: that the door is generating a high voltage Hi, that the door signal from the door switch 19 has disappeared, and that the set switch 17 is generating a set signal. do.

In such a state, if the CPU stops executing the main control program in response to the time value from the interrupt timer and starts executing the interrupt control program at step 60 (see FIG. 3), The speed pulse from the speed sensor 16 (currently a low level signal) is stored in the RAM in the next step 61. Proceeding to step 62 of the interrupt control program, the CPU determines whether the storage pulse in step 61 is at a high level.

Then, the CPU determines "NO" and advances the interrupt control program to step 65, where the flag F is set.

It is determined whether or not it is set to a low level, that is, 0.

Then, the CPU determines "YESJ" based on the set level of the flag Fl in step 41 of the main control program, and in the next step 6B, adds "1" to the count value C by the RAM counter and displays the addition result. is newly set as C and the interrupt control program proceeds to step 69, where it is determined whether or not the count value C is 2 seconds or more. In this case, the RAM counter counts the level change of the speed pulse stored in the RAM in response to the clock signal from the clock circuit, and the added value "1" by the RAM counter is calculated by the interrupt program. It matches the time required for execution (/m5ec). However, still
Since the count value C is not greater than l sec, CP
U determines "N, OJ" in step 69, and ends execution of the interrupt control program in step 71.

When the execution of the interrupt control program is finished and the main control program is executed, the CPU executes step 4.
2, based on the reset state of the flag Fs in step 41, it is determined as "YE8J", and the main control program proceeds to step 43, where it is determined whether or not the set condition is satisfied.

However, at this stage, since at least the set switch 17 has not been operated, the CPU is not operated in step 43.
"NOJ" is determined, and the main control program is set to step 4.
Proceeding to step 7, it is determined whether the condition for stopping the starter 1 is met. In this case, one condition for stopping the starter 1 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 Hi, so C
The PU determines [YE8J] in step 47 and returns the main control program to step 42 through step 48. Note that during the execution of the main control program described above, C
When the time value of the interrupt timer reaches 7 m5ec, the PU stops executing the main control program and executes the interrupt control program shown in the flowchart of FIG.

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 a high voltage Hi from the regulator relay 15 and a set signal from the set switch 17, as well as generates the door switch 1.
Based on the disappearance of the door signal of 9, it was determined that it was YE8J,
It is determined whether or not the engine stop condition is met. In this case, the conditions for stopping the engine are that the second clutch signal from the second clutch switch 18b disappears, and that the count value C on the RAM counter is 2 sec.
(The time required for the vehicle to stop once after operating its brakes) C is established due to the simultaneous fulfillment of the two requirements.

Therefore, at this stage, if the counted value C by the RAM converter is not greater than :l sec, the CPU determines that it is 1Nn in step 50,
In the next step 56, a power supply signal 5 is generated. Then, the ignition relay 34 responds to the power supply signal from the CPU under the control of the transistor 33 and closes the normally closed contact 34.
b is maintained in a closed state to allow power to be supplied from DC power source B to ignition coil/l/12C. At the same time, the fuel cut relay 35 maintains the normally closed contact 35b in the closed state, and the electromagnetic coil/V 36 a of the electromagnetic valve 66 is switched from the DC type sB to the electromagnetic coil/V 36 a of the electromagnetic valve 66.
The electromagnetic valve 36 maintains an open state under the excitation of the electromagnetic coil 36a, and the fuel from the fuel supply source 10b is supplied to the pipe P1, the electromagnetic valve 56, and the pipe P2.
, the carburetor 1[]a, and the intake pipe of the engine, and are introduced into the combustion chamber thereof.

Then, when the main control program returns to step 42,
The CPU determines "NO" based on the result of setting the flag Fs in step 44, and advances the main control program to step 49, where it determines whether a cancellation condition for canceling the engine from under automatic start/stop control is met.

In this case, the cancellation condition is satisfied when the requirement that a door signal is generated from the door switch 19 or a set signal is generated from the set switch 17 while the flag Fs is set is satisfied. 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 "NOJ" at step 49, and steps the main control program to step 1. The process proceeds to step 45 through 50 and 56, and it is determined whether or not the driving conditions for the starter 11 are satisfied.In this case, the driving conditions for the starter 11 are that the regulator relay 15 is generating the low voltage Lo and that the driving condition for the starter 11 is satisfied. This condition is established when the two conditions that the first clutch switch 18a generates the first clutch signal are satisfied simultaneously.

Based on the disappearance of the second clutch signal, the CPU determines "N (JJ)" in step 45, and determines "NO" in step 47 based on the low voltage Lo from the regulator relay 15. Main control program step 4
Return to 2.

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 a microphone is provided to the computer 20. At this stage, if the CPU starts executing the control program in step 60 (see FIG. 3) in accordance with the clock value from the interrupt timer, the speed pulse from the speed sensor 16 is processed in the next step 61. R.A.
Stored in M. 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 executes the interrupt control program in step b.
Proceeding to step K, it is determined whether the flag F1 is at a high level, that is, 1. Therefore, based on the level of the flag F in step 41 of the CPU 75f, the main control program,
If the answer is "NO", the interrupt control program is executed at step 66.
Proceed to and set the flag F□=1. When the interrupt control program proceeds to step 67, the CPU resets the count value C of the counter provided in the RAM, and the interrupt control program ends at step 71. When the main control program proceeds to step 50, the CPU resets to "N" due to the reset result in step 67 of the interrupt control program.
O”, and the main control program is executed in step 56.45.
．． 47 and 48 to return to step 42.

Thereafter, when the execution of the main control program is shifted 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. If the speed pulse stored in this RAM is at a low level, that is, zero, the CPU determines "NO" in step 62, and advances the interrupt control program to step 63 to check whether the flag Fl=Q or not. Determine whether Then, the CPU determines "NO" based on the set result F,=1 in step 66, and the process proceeds to step 6.
In step 5, F1 is set to 0, and in step 67, the count value C of the RAM counter is reset, and the execution of the interrupt control program is ended. Then, when the main control program reaches step 50, the CPU determines NO'J in the same way as in the case described above, and returns the main control program to step 42.

In such a running state of the vehicle, if the brake pedal is operated to temporarily stop the vehicle at an intersection or the like, the interrupt control program that passes through steps 65 (or 66) and 67 and steps 42, 49, and 50 .56
, 45, 47, and 48, the vehicle is decelerated and stopped with the second clutch signal generated from the second clutch switch 18b by depressing the clutch pedal. However, the second latch signal disappears when the clutch pedal is released. At this time, the speed pulse generated from the speed sensor 16 also disappears.

Therefore, the CPU executes step 68 of the interrupt control program.
While repeating the addition operation in step 69, the determination as "NO" in step 69, and the determination as "NOJ" in step 50 of the main control program, step 6
When the addition result in 8 reaches 2 seconds or more, C-
The PU determines -C[YESJ in step 69, and in step 70, the count value C by the RAM counter is set to 2 se
Set to c. Then, when the main control program proceeds to step 50, the CPU switches the second clutch switch 18.
Disappearance of the second clutch signal from b and step 70-'
□・]4 is determined to be YESJ, and the main control program advances to step 51 to determine whether the regulator relay 15 is generating the low voltage Lo.Then, the CPU In relation to the high voltage Hi generated from relay 15, it is determined that it is NOJ,
The main control program advances to step 52 to reset the cutoff time C.

In this case, the cutoff time C means that after the output from the regulator relay 15 changes from high voltage Hi to low voltage Lo, the solenoid valve 36 operates the pipe P2 under the control of the fuel cut relay 35.
and 21, and in this embodiment, 0.4'8ea is the minimum necessary value.

When the main control program proceeds from step 52 to step 55, the CPU generates a power supply stop signal and
Granted to 3. Then, the transistor 33 becomes conductive in response to the power supply stop signal from the CPU, and the ignition relay 34 closes the normally closed contact 34 due to the excitation of the electromagnetic coil/L/34a.
Open b and stop the power supply to the ignition coil 1v120. At the same time, the fuel cut relay 35
The normally closed contact 35b is opened by the excitation of I/35a, and in response, the solenoid valve 56 is closed by demagnetization of the solenoid coil /I/'56a, thereby cutting off communication between the pipes P2 and 21. Thereafter, the engine 10 suddenly drops in its rotational speed and stops, and the regulator relay 15 generates a low voltage LO. Also, at this time, the fuel in the T passage P2 located between the solenoid valve 36 in the closed state and the combustion chamber of the engine 10, the carburetor 10a, and the trachea of the engine 10 increases at the rotational speed of the engine 10 described above. During the drop, it is introduced into the combustion chamber of the engine 10 and consumed. The main control program generates a power supply stop signal in step 55 and then returns to step 42 through steps 45 and 47.

Therefore, when the main control program reaches step 51, the CPU outputs the low voltage LO from the regulator relay 15.
In relation to this, it is determined that [, YE8J, and in the next step 53, it is determined whether the cut-off time C is 0.4'sec or more. At the current stage, one cut-off time C is Q
Since llsea has not been reached, the CPU returns to step 53.
At step 54, the main control program is determined to be NOJ.
Proceeding to step 52, 10 msec is added to the reset value of the cutoff time C in step 52, and this addition result is set as the new cutoff time C. The CPU then returns the main control program through steps 55.45 and 47 to step 42.

Thereafter, during the repetition of the determination as "NO" in step 53 and the addition operation in step 54, when the addition result in step 54 reaches θgusea, C
The PU determines YESJ in step 53, and generates a power supply signal in the next step 56. Then the ignition relay! 14 is CP under the control of transistor 33
In response to the power supply signal from U, the normally closed contact 34b is closed to allow full power supply from the DC power supply B to the ignition coil l12c). At the same time, the fuel cut relay 35 closes the normally closed contact 35b to allow power to be supplied from the DC power source B to the electromagnetic coil l 36 a of the electromagnetic valve 36, thereby exciting it.

This opens the electromagnetic valve 36 to allow communication between the pipes P2 and P1. As a result, fuel from the fuel supply source 10b is transferred to the solenoid valve 36. The gas flows into the pipe P2, the carburetor 0a, and the intake pipe of the engine 10, resulting in a full state.

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 45.
When the process proceeds to step 46, the cPU determines l'-YESJ and generates a drive signal in step 46. Then, the transistor 31 becomes conductive in response to the drive signal from the OFU, and the starter relay -32 closes the normally open contact 32b by excitation of the electromagnetic coil/I/32a, driving the starter 1 and starting the engine 10. do. At this time, as mentioned above, the pipe P2
Since fuel has already flowed into and filled the carburetor 0a and the intake pipe of the engine 10, the engine 10 is supplied with fuel into its combustion chamber at the same time as the engine 10 starts rotating, and the engine 10 smoothly completes its startup.

As you can understand from the above explanation, engine 1
After the power supply to the solenoid valve 36 is stopped when the engine 10 is stopped, the power supply to the solenoid valve 56 is maintained in the closed state until the cutoff time C becomes Q, psea or more, and the engine 10 is thereby stopped. Minimize unnecessary consumption of fuel inside the vehicle. Further, when the cutoff time C becomes θ1Isea or more, the electromagnetic valve 36 opens due to the start of power reception and supplies fuel from the fuel supply source 10b to the pipe P2+capretor 10a.
and the engine 10 by flowing into the intake pipe of the engine 10.
At the time of starting, fuel is smoothly supplied into the combustion chamber at the same time as the engine starts rotating, and the starting is completed.

After the regulator relay 15 generates a high voltage Hi upon completion of starting the engine 10, when the main control program proceeds to step 47, the CPU determines ``YESJ'' and generates a drive stop signal in the next step 48. As a result, the transistor 31 becomes non-conductive, opening the normally open contact 321 of the starter relay 32 and stopping the starter 11.Then, the vehicle sequentially releases its clutches by operating its starting operation mechanism. Engage and start.

In addition, if the door of the vehicle is opened while the vehicle and engine are temporarily stopped, the door switch 5
9 generates a door signal. Therefore, when the main control program proceeds to step 49 in such a state, the CPU
is judged as "YESJ" based on the generation of the door signal, and the main control program proceeds to step 57 to reset the flag Fs.After that, the CPU generates a drive stop signal in step 58, and in step 59 As a result, the transistor 31 becomes non-conductive in response to the drive stop signal, and the normally open contact 32b of the starter relay 32
The transistor 33 is maintained in the open state to disable automatic driving of the starter 11, and the transistor 33 becomes non-conductive in response to the power supply signal, thereby closing the normally closed contact 34b of the ignition relay 34 and the normally closed contact 35b of the fuel cut relay 35. It is maintained in the closed state, and power can be supplied to the ignition coil/L'12.0 and the solenoid valve 36. Note that in a state where the automatic start/stop control of the engine 10 is canceled in this way, the engine will not start unless the ignition switch 13 is operated. .

In addition, in the above embodiment, the cutoff time C is set to Olsea
Although the above description is not limited to this, modifications may be made as appropriate and necessary.

In addition, in the above embodiment, the ignition ') V
-34 and fuel cut relay 35 to transistor 35
However, instead of this, only the fuel cut relay 35 may be controlled by the transistor 33.

Further, 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 34b of the ignition relay 34. Fuel injection may be stopped when the valve opens.

Furthermore, in the above embodiment, an example was explained in which the engine is automatically stopped when the vehicle is stopped.
Alternatively, for example, a one-touch manual operation switch may be employed to detect when the vehicle is stopped and to manually operate the one-touch manual operation switch to stop the engine.

As explained in detail above, in the method for automatically starting and stopping an automobile engine according to the present invention, as shown in the above embodiment, the engine is stopped when the automobile is stopped, and fuel is supplied from the fuel supply source. A part of the fuel supply circuit that supplies the engine to the engine is closed to shut off the engine from the fuel supply source, and when a predetermined period of time has elapsed after the shutoff, part of the fuel supply circuit is unclosed to shut off the engine. Since the fuel supply circuit is filled with fuel from the fuel supply source before starting, the problem mentioned at the beginning of this specification can be reliably solved, and unnecessary consumption of fuel can be minimized. The engine can always start smoothly while controlling the

Easy drawings: Na Kenmei
FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are flow charts showing the operation of the microcomputer shown in FIG. 1, respectively.

Explanation of symbols 10...Engine, 10a...Carburetor, 11.
...Starter, 12...Ignition times G, is...
...Ignition switch, 16...Speed sensor,
17... Set switch, 18a... Seventh clutch switch, 18b... Second clutch switch, 20...
... Microcomputer, 151.55 ... Transistor, 62 ... Starter relay, 34 ... Ignition relay, 36 ... Solenoid valve + Pl * P
2... Conduit.

Applicant: Nippondenso Co., Ltd. (7 others) Agent: Patent Attorney Teru Hase

Claims (1)

[Claims] When starting the automobile, the engine is automatically started in response to operation of the starting operation mechanism of the automobile in a state where fuel from a fuel supply source can be supplied to the engine of the automobile through the fuel supply circuit, and the falling vehicle After the vehicle has started, it detects that the vehicle is in a running state and maintains the rotation of the engine based on this detection result, and when the vehicle stops, stops the engine and a part of the fuel supply circuit. is closed to shut off the engine from the fuel supply source, and when a predetermined period of time has elapsed after the shutoff, a part of the fuel supply circuit is opened to supply fuel from the fuel supply source to the fuel supply circuit before starting the engine. A method for automatically starting and stopping an automobile engine in which the fuel supply circuit is filled with fuel.