JPS5820945A - Method of automatic starting and stopping for engine of automobile - Google Patents

Abstract

PURPOSE:To prevent noise and abrasion of coupling parts by a method wherein electric power supply for a starter is interrupted when a predetermined time has elapsed after the power supply for the starter was begun while the power is supplied to drive the starter again after second predetermined time has elapsed, in case the starter fails to connect the engine upon starting the engine of the automobile. CONSTITUTION:Upon starting the engine of the motorcar, in case the pinion of the starter 11 is in a slipping condition since it failed to mesh with the ring gear of the engine even after the starter 11 is driven based on the power supply thereto effected by treadling a clutch pedal, and the revolving speed of the engine is kept at 100rpm or less without being increased in accordance with the revolving speed of the starter 11 even when a set value 1sec of the drivingtime Don of the starter has elapsed after beginning of the power supply thereto, the power supply for the starter 11 is interrupted in response to the elapse of 1sec. When the delay time Doff=1sec for driving the starter has elapsed, the starter 11 begins to drive the engine again by the power supply therefor, and if the pinion thereof is meshed with the ring gear smoothly, the engine is started and the power supply for the starter is interrupted to stop it in response to the finish of the engine starting.

Description

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

Conventionally, in this type of automatic start/stop method, when starting a car engine, the engine no-starter is automatically energized and driven in response to depression of the car's clutch pedal, and the engine is started. The rotational speed increases as the rotational speed of the starter increases, and when the starting is completed, this is detected and the energization to the starter is cut off to stop the starter.

By the way, in such an automatic start/stop method, when the engine is started, the pinion provided on the output shaft of the starter may mesh with the ring gear provided on the flywheel of the engine, for example, in the event of a slip condition. The engine remains at a low rotational speed where the engine rotational speed may increase along with that of the starter. Therefore, even if such a problem occurs, if the starter is kept energized by depressing the clutch pedal, there will be no noise such as gear noise or wear at the connection between the starter and the engine, such as the pinion or ring gear. This results in damage to the engine, and also causes unnecessary power consumption because the power supply to the starter cannot be cut off due to incomplete starting of the engine.

The present invention attempts to address such problems, and its purpose is to:
The starter is driven by the energization, and when the first predetermined time has elapsed after the start of energization to the starter, the energization to the starter is cut off, and when the second predetermined time has elapsed after the energization to the starter is cut off, the vehicle starts. An object of the present invention is to provide a method for automatically starting and stopping an automobile engine, which connects the starter to the engine by reenergizing and driving the starter under the operation of an operating mechanism.

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. 13 to a direct current source 10. When the ignition switch 13 is operated to temporarily connect the movable contact 1a & to the fixed terminal 18e, the starter 11 is supplied with power from the DC power supply 10 and starts, putting the engine in a cranking state.

The ignition circuit 12 includes a control circuit 12& connected to a signal generator provided in a distributor of the engine, and a control circuit 12 connected to the control circuit 12 through a transistor 12b.
and an ignition coil 12C connected to a. Transistor 12b becomes conductive under the control of control circuit 12B 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. In other words, each time the transistor 12b becomes non-conductive, it generates a collector signal (having a high level), the period of which corresponds to the period of the signal from the signal generator, ie the rotational speed of the engine. The ignition coil 120 is in a state where it can receive power from the DC power supply 10, 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 applying it to the distributor. Give.

The alternator 14 is connected between the DC power supply 10 and the regulator relay 15, and when driven by the engine, it generates an AC voltage at the neutral point N of its stator coil, converts it into a DC voltage, and converts it into a 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 150, and a double-headed contact 15b connected to a ground terminal 15C or a fixed terminal 15d connected to the DC power supply 10. It is equipped with However, electromagnetic coil 1
When 5B is in the demagnetized state, double-headed contact 15b is connected to ground terminal 150 to generate a low voltage LO from the output terminal. When the electromagnetic coil 15& is excited by the alternating current voltage generated at the neutral point N of the stator coil, the double-headed contact 15b is connected to the fixed terminal 15d and a high voltage Hi is applied from the output terminal.
occurs.

The microcomputer 20 includes a transistor 12b, a regulator relay 15, a speed sensor 16, a set switch 178, and a first clutch switch 18a.

It is connected to the second clutch switch 18b and the door switch 19. The speed sensor 16 is composed of a circle t7i, 1.6B made of a permanent magnet, and a reed switch 16b arranged to form a magnetic relationship with each protrusion of this disc 16a. It is attached to the speed meter drive cable 168 connected to the output shaft of the automatic power transmission device. However, disk 16
When & rotates in conjunction with the drive cable 160, the reed switch 16b sequentially detects each protrusion on the disc 16a, and the set switch 17 generates a series of speed pulses corresponding to the actual running speed of the vehicle. It is a normally open switch that has a function and is installed at a suitable location in the vehicle interior of the vehicle. However, this set switch 1
7 generates a set signal by its temporary closure. 1st
and second clutch switches 18B and 18b are both provided on the clutch pedal of the vehicle, and the first clutch switch 18a is of the normally open type and outputs the first clutch signal when the clutch pedal is fully depressed. Occur.

The second clutch switch 18b is of a normally closed type, and
Depressing the clutch pedal generates a second clutch signal, and releasing the clutch pedal eliminates this second clutch signal. The door switch 19 is a normally closed type switch, which is installed on the door of the vehicle and generates a door signal when the door is opened, and the door signal microcomputer 2
o is formed by an LSI, and becomes activated in response to a constant voltage (5V) generated from a constant voltage circuit 21 by supplying power from the DC power supply 1o 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 "o"), a read-on bright memory (hereinafter referred to as "Ugly"), and a random access memory (hereinafter referred to as "Ugly"). ) and a clock circuit are provided, and these CP
The U, 1/ROM, RAM, and clock circuits are connected to each other via path lines. 4 is a collector signal from the transistor 12b;
Low voltage Lo (or high voltage Hi) from the regulator relay 15, each speed pulse from the speed sensor 16, a set signal from the set switch 17, and the first and second clutch switches 13a and 18b. 2 and the door signal □ from the door switch 19 are received and applied to the RAM. the law of nature. 2. □Yo, crystal line, 2□Yo connection 8ゎ゛゛This cooperation with the crystal oscillator 22 generates a series of clock signals. The title is
CP the flowcharts shown in Figures 2 and 8, respectively.
A main control program and an interrupt control program necessary for U to execute are stored in advance.

The CPU has an interrupt timer, and this interrupt timer starts counting time at the same time as the microcomputer is started, and when its clock value reaches lm5ec, it is re-nutted and starts counting again. 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 lm5ec, the CPU stops executing the main control program and controls the interrupt. By executing the program and alternately executing both control programs, various calculation processes are performed as described below, and the drive signal (or drive stop signal) and ignition signal necessary to drive (or stop) the starter 11 are executed. This generates the energization signal (or energization stop signal) necessary for energizing (or de-energizing) the coil 12e. In this case, the execution of the main control program by the C1PU is repeatedly completed within IQ m5ec after its start.

The microcomputer 20 has a starter! JL/-8
2 and ignition relay 34 are connected via transistors 81 and 88, respectively. The transistor 31 connects the microcomputer 20 at its base to -
It is connected to the fixed terminal TAB of the ignition switch 13 at its emitter, and conducts when it receives a drive signal from the CPU when the ignition switch 18 is closed, and when it receives a drive stop signal from the CPU. It becomes non-conductive. Transistor 88 has its emitter grounded and its base connected to the CPU.
It becomes non-conductive upon receiving an energization signal from the CPU, and becomes conductive upon receiving an energization stop signal from the CPU.

The starter relay 82 has an electromagnetic coil 82 & a normally open contact 82
The electromagnetic coil 82B is grounded at one end, connected to the collector of the transistor 31 at the other end, and excited by receiving power from the DC voltage generator 10 while the transistor 8.1 is conducting. and is demagnetized in response to the non-conduction of transistor 81. Normally open contact 8 of starter relay 82
2b is connected between the DC power supply 10 and the starter 11, and closes in response to the excitation of the electromagnetic coil 82&, allowing power to be supplied from the DC power supply 10 to the starter 11.
Start 1. Further, the normally open contact 82b is connected to the electromagnetic coil 32
In response to the demagnetization of a, the power supply to the open starter 11 is cut off to stop it. The ignition relay 84 consists of an electromagnetic coil 84a and a normally closed contact 84b.
4a is connected between the fixed terminal 18b of the ignition switch 18 and the collector of the transistor 88, is demagnetized when the transistor 83 is non-conductive, and receives power from the DC power supply 10 in response to the conduction of the transistor 88. It is excited by The normally closed contact 84b is the electromagnetic coil 84B.
When in the demagnetized state, it closes to allow power supply to the ignition coil 120 from the DC power supply 10, and opens in response to excitation of the electromagnetic coil 14Jl/84a to cut off power supply to the ignition coil 12e.

In this embodiment configured as described above, the
3 is operated to connect the movable contact 18 & to the fixed terminal 13b, the constant voltage circuit 21 connects the DC power supply 10
The microcomputer 20 is supplied with power and generates a constant voltage, and in response to this, the microcomputer 20 becomes operational. 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. Next, when the ignition switch 13 is operated to temporarily connect the movable contact 18& to the fixed terminal 180, the starter 11 is connected to the DC power supply 10.
The engine is started in cooperation with the ignition circuit 12 by receiving power from the ignition circuit 12. At this time, regulator relay 15 generates high voltage Hi under the control of alternator 14. It is assumed that the reed switch 16b is closed due to the magnetic relationship with the disc 16a when the vehicle is stopped.

In this state, the main control program executes step 41.
, the CPU initializes the contents of the microcomputer 20, resets the flag Fs, and sets the flag F1 to the actual level of the speed pulse from the speed sensor 16 (at this stage, the reed switch 16b is closed). Therefore, it is assumed that the speed pulse to be generated from this reed switch 16b is at a low level, that is, zero.), the main control program advances to step 42, and the flag Fs is set to
is in a reset state. In this case, the flag Fs indicates that the set conditions for setting the engine under automatic start/stop control are satisfied, and the set conditions include that the regulator relay 15 is generating a high voltage Hi, and that the door This is achieved when the above three requirements are satisfied simultaneously: the door signal from the switch 19 disappears, and the set switch 17 generates a set signal.

In this state, if 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 60 (see FIG. 8), the speed sensor The velocity pulse from 16 (currently a low level signal) is sub-stored in the next step 61. When the interrupt control program proceeds to step 62, the CPU makes a determination as to whether the storage pulse in step 61 is at a high level. However,
The CPU determines "NO" and advances the interrupt control program to step 68, where it determines whether the flag F1 is set to a low level, that is, 0.

Then, the CPU sets [YE8J] based on the set level of flag F1 in step 41 of the main control program.
Then, in the next step 68, ``1'' is added to the count value C of the key counter, and this addition result is set as a new C. The interrupt control program proceeds to step 69, and the count value C becomes 2 s. , ec or more.

In this case, the second counter counts the time during which there is no change in the level 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 second counter is calculated by the interrupt program. The time required to execute (l
m5ec). However, the count value C
Since the time is not longer than 2 seconds, the -CPU determines "NO" in step 69, and ends the 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 advances the control program to step 48 and determines whether or not the set condition is satisfied. However, at this stage, at least the set switch! 7 has not been operated, the CPU determines l'-NOJ at step 43 and returns the main control program to step 42.

Nao, during the execution of the main control program mentioned above,
Each time the measured value of the interrupt timer reaches 1 m5ec, the CPU stops executing the main control program and executes the interrupt control program as described above.

While each of these control programs is being executed, the door switch 19 eliminates the door signal in response to the closing of the automatic door, and the set switch 17 generates a set signal by its temporary operation. In the meantime, 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, and generates the door switch 1.
Based on the disappearance of the door signal from step 9, it is determined as "YB2 J", and the main control program is further advanced to set the flag Fs in step 44, and in the next step 45, it is determined whether the engine is stopped or not. Then, the CPU
is based on the high voltage Hi from the regulator relay 15.
oJ, and then in step 55 it is determined whether the engine stop condition is satisfied. In this case, the condition for stopping the engine is that the second clutch switch 18
The two requirements are met at the same time: the second clutch signal from B has disappeared, and the count value C by the key counter is 2 seconds (the time required for the vehicle to stop once after operating the brake pedal). This holds true.

However, at this stage, assuming that the count value C by the key counter is not greater than 2 seconds, C
The PU determines l-No J in step 55 and returns the main control program to step 42.

As described above, 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 the cancellation condition for canceling the engine from under automatic start/stop control is satisfied. The main control program advances to step 54 in which it is determined whether or not there is. In this case, the cancellation condition is satisfied when the requirement that the 17 signal is generated from the door switch 19 or the set signal is generated from the set switch 17 while the flag Fs is set is satisfied. Therefore, since the door signal from the door switch 19 has disappeared and the set signal has not been generated from the set switch 17, C
The PU determines "NO" in step 54 and returns the main control program to step 42 through steps 45 and 55.

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, if the CPU responds to the clock value from the interrupt timer, stops executing the main control program, and starts executing the interrupt control program at step 60 (see Figure 3), the speed will increase. The velocity pulses from sensor 16 are stored in the next step 61. When the interrupt control program proceeds to step 62, the CPU determines in step 61 whether or not the memorized speed pulse 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 6.
4, it is determined whether the flag F1 is at a high level, that is, 1. Therefore, the CPU selects "N" based on the level of flag F1 in step 41 of the main control program.
o J, the interrupt control program advances to step 66, and flag F is set to 1. When the interrupt control program proceeds to step 67, the CPU resets the count value C of the counter provided in the background, and terminates the interrupt control program at step 71. When the main control program proceeds to step 55, the CPU interrupts the interrupt control 'boo;
) rNOJ, and the main control program is executed in step 42.
Return to

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 vaguely stored in step 61. If the speed pulse stored in this pigeon is at a low level, that is, zero, the CPU determines l'-No J at step 62, advances the interrupt control program to step 68, and sets the flag F1=0. It is determined whether or not. Then, the CPU determines "NO" based on the set result Fl=l in step 66, and proceeds to step 6.
At step 5, F1 is set to 0, and at step 67, the count value C of the key counter is reset, and the execution of the interrupt control program is ended. Then, when the main control program reaches step 55, the CPU determines "NO" 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, 54, and 45 and 5
While the CPU repeats each execution of the main control program through step 5, the vehicle is decelerated and stopped in a state where the second clutch signal is generated from the second clutch switch 18b by depressing the clutch pedal. 2 The clutch signal disappears upon release of the clutch pedal. 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 "NO" in step 55 of the main control program, step 6
If the addition result in 8 reaches 2 seconds or more, CP
In step 69, U determines that it is YE8J, and
2se count value C according to RAM0 counter at 0
Set to c. Then, when the main control program proceeds to step 55, the CPU switches the second clutch switch 18.
Based on the disappearance of the second clutch signal from b and the setting result in step 70, it is determined as [YB2 J, and the main control program proceeds to step 56 to generate a energization stop signal.

Then, the transistor 88 becomes conductive in response to the energization stop signal from the CPU, and the ignition relay 84 opens the normally closed contact 84b by excitation of the electromagnetic coil 84B, thereby stopping the energization to the ignition coil 120.

This causes the engine to stop and regulator relay 15
generates a low voltage LO.

When the main control program returns to step 42 and reaches step 45, the CPU determines l'-YB2 J based on the low voltage Lo from the regulator relay 45, and the main control program determines whether or not the starter 11 is stopped. The process advances to step 46 for determination. Then, since the CPU has not generated a drive signal yet, it determines that it is [YB2 J,
In the next step 51, the drive delay time D OFF 〇 of 7.9-11 is determined. However, (:!
In connection with the initialization in step 41, the PU
2 J, the main control program advances to step 52, and it is determined whether the engine starting conditions are satisfied.

In this case, the engine starting condition is that the regulator relay 15 is generating a low voltage LO. Then, based on the disappearance of the first clutch signal, the CPU determines l'-No J in step 52, resets the driving time DON of the starter 11 in step 58, and returns the main control program to step 42.

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 52.
When the process proceeds to , the CPU determines "YB2 j" and generates a drive signal in step 52 &.Then, the transistor 31 becomes conductive in response to the drive signal from the CPU, and the starter relay 82 is activated by the excitation of the electromagnetic coil 82a. The normally open contact 82b is closed, and in response, the starter 11 is energized and begins to drive the engine.When the main control program proceeds to step 58, the CPU resets the starter drive time DON, and the main control program Step 42
Return to

By the way, Star 91 for the above-mentioned engine
If it is assumed that the pinion provided on the output shaft of the starter 11 is in a slip state in which it can smoothly mesh with the ring gear provided on the flywheel of the engine at the drive start time of 1, the rotational speed of the starter 11 increases. However, the rotational speed of the engine hardly increases. When the main control program reaches step 46 in a state where the engine is loose, the CPU determines "No J" based on the generation of the drive signal in step 52&, and in the next step 47, the condition for stopping the starter 11 is satisfied. In this case, the condition for stopping the starter 11 is satisfied by the requirement that the regulator relay 15 generates the high voltage H7.

However, at this stage, as mentioned above, there is a slip in the connection between the starter 11 and the engine, and the engine has not yet finished starting, and the regulator relay 15 is under the control of the alternator 14 to lower the low voltage Lo.
is occurring. Therefore, the CPU determines NO'J in step 47, and executes the main control program in step 48.
Then, it is determined whether or not the starter drive time DON=lsee. In this case, the value of the starter drive time DON (1 sec) corresponds to the time expected to be required to complete starting of the engine. However, the CPU determines l'-No J in relation to the reset result of the starter drive time DON in step 58, and after adding 10 m5ec to the reset result in step 53 in the next step 48&, The main control program returns to step 42.

As mentioned above, after returning the main control program to step 42, while repeating the determination as "No J" in step 48 and the addition operation in step 48B, the addition result in step 48a is
sec, the CPU executes [Y
ES J, the main control program advances to step 49, and the engine rotation speed is 100 r, p11Q.
It is determined whether or not the above is the same. However, at this stage, since a slip condition has occurred in the connecting portion between the starter 11 and the engine, the CPU operates the [-N
o J, and the next step T'1. ') Set the drive delay time D OFF to l see at H, and proceed to step 50 of the control program to generate a drive stop signal. As a result, transistor::1 becomes non-conductive, opening the junction of starter relay 82, and in response, starter 11 is de-energized and its rotational speed is gradually reduced. go. In this embodiment, the drive delay time n OFF = 1 sec means the time required for the starter II to stop after being de-energized.

Afterwards, when the main control program reaches step 46,
The CPU determines "YES J" based on the generation of the drive stop signal in step 5o, determines "NO" in step 51 based on the set result in step 49a, and in the next step 51&, determines 1. from the set result in step 49a. Subtract 0 m5ec, set this subtraction result as a new D OFF, and change the main control program to step 5.
8 and return to step 42. Thereafter, the determination as "NO" in step 51 and the subtraction in step 51a are repeated, and the subtraction result in step 5ta is D.
When OFF 20 is reached, CPU p; step 51
``YES J'' is determined, and the main control program advances to step 52.

If the clutch pedal is not depressed at this stage, the CPU determines "NO" in step 52, and returns the main control program to step 42 through step 58. Further, if the first clutch switch 18a generates the first clutch signal by depressing the clutch pedal, the CP
U determines "YES J" in step 52, and generates a drive signal in the next step 52&.Then, starter 11, under the control of transistor 81 and starter relay 32, responds to the drive signal from +'cr CPU. The engine is energized and begins to drive.In this case, starter 1
When RAM 1 proceeds to step 58, the CPU resets the starter drive time DON and returns the main control program to step 42. Note that at this stage, it is assumed that the engine has finished starting and the regulator relay 15 is generating the high voltage Hj.

When the main control program reaches step 46, the CPU outputs a "NO" signal based on the generation of the drive signal in step 52B.
”, and in the next step 47, in relation to the high voltage Hi from the regulator relay 15, it is determined as [YB2 J, and in step 5o, a drive stop signal is generated. As a result, transistor 31 becomes non-conductive, opening normally open contact 82b of starter relay 32, and stopping starter 11. Note that after the engine has been started, the vehicle starts by operating its starting operation mechanism. In addition, in the explanation of the operation described above, the determination in step 49 is [
If YB2 J, the CPU returns the main control program to step 42.

Even if the starter 11 is driven based on the energization, the pinion provided on the output shaft of the starter 11 cannot mesh with the ring gear provided on the flywheel of the engine, resulting in a slip state. Drive time D
When the ON set value (l see ) elapses, if the engine rotational speed is not increasing along with the rotational speed of the starter 11 and is below 1100 rSp1, the starter drive time DON = l sec has elapsed. In response to this, the power supply to the starter 11 is cut off, and after the starter drive time DON = lsee has elapsed, the drive delay time DO
The power supply to the starter 11 is kept cut off until FF = l 8eC elapses, and the drive delay time D OFF =
When l See has elapsed, the starter 11 begins to drive the engine through the passage. . Step 9. Yu, L month 1.
) If P, O, mesh smoothly with the ring gears of... Then, the starter 11 is de-energized and stopped.

In other words, due to an unfavorable situation such as a slip condition occurring at the connection between the starter 11 and the engine, the starter 11 is closed as the starter drive time D.)N2',.ea elapses. The rotation speed is! Even if the engine rotational speed is 10 Or, p%m, J) k, the power to the starter 11 will be cut off when the starter drive time DON has elapsed after the starter 11 is energized. , the continuation of the above-mentioned slip conditions and other troublesome situations should be kept as short as possible. , (',) can prevent the occurrence of noise such as gear noise or damage such as wear in the connecting portion, and also prevent unnecessary power consumption. In addition, the drive delay time D after the starter drive time Doll has elapsed
When the rotational speed of the starter 11 decreases as the OFF period progresses and becomes almost equal to that of the engine, the starter 11
Since the starter II and the engine are re-energized, it is possible to achieve a state in which the starter II and the engine can be smoothly connected, and therefore, the starting of the engine can be smoothly completed while preventing the above-mentioned noise or damage.

Furthermore, 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 54 in such a state, the CPU executes [Y] based on the generation of the door signal.
B2j is determined, and the main control program proceeds to step 57 to set the flag Fs. After that, the CPU generates a drive stop signal in step 58, and in step 5
An energization signal is generated at 9.

As a result, transistor 81 becomes non-conductive in response to the drive stop signal, maintains normally open contact 82b of starter relay 32 in an open state, and disables automatic drive of starter 11, and transistor 38 becomes non-conductive in response to the energization signal. The normally closed contact 84b of the ignition relay 84 is maintained in a closed state, and the ignition coil 120 is enabled to be energized.

Note that in a state where the automatic engine start-stop control is canceled as in Jin, the engine will not start unless the ignition switch 13 is operated.

In addition, in the above embodiment, the starter drive time DON
Although the maximum value of and the set value of the drive delay time D OFF are each set to l see, the present invention is not limited to this and may be changed as appropriate.

Further, in the above embodiment, the engine rotational speed determination criterion in step 49 was set to 100 r% P1m, but the criterion is not limited to this, and may be modified as appropriate.

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 that controls the amount of fuel injected into the diesel engine is adopted, and this fuel injection amount control circuit controls the normally closed state of the ignition relay 84. Fuel injection may be stopped when the contact point 84b opens.

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 shown in the above embodiment, even if the starter is driven by the energization when starting the engine, it cannot be connected to the engine. If this occurs, the power to the starter is cut off when the first predetermined time has elapsed after the start of energization to the starter, and the vehicle is started when the second predetermined time has elapsed after the energization to the starter is cut off. Its structural feature is that the starter is reenergized and driven under the operation of the operating mechanism, thereby connecting it to the engine, which solves the problem mentioned at the beginning of this specification. The occurrence of the problem can be prevented, and the starting of the engine can be completed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 8 are flow charts showing the operation of the microcomputer shown in FIG. 1, respectively. Explanation of symbols 11...Starter, 12...Ignition circuit, 18...Ignition switch, 16...
...Speed sensor, 17...Set switch, 18a
...First clutch switch, 18b...Second clutch switch, 20...Microcomputer,
81.8111...Transistor, 32...Starter relay, 84...Ignition relay. Applicant Nippondenso Co., Ltd. (and 1 other person) Representative Patent attorney Chief Winter clothes -

Claims (1)

[Claims] Automatically energizes and drives a starter provided in the engine of the vehicle in response to an operation of a starting operation mechanism when the vehicle starts, thereby connecting the starter to the engine;
If the starter cannot be connected to the engine, the power to the starter is cut off when a first predetermined time has elapsed after the start of energization to the starter, and a second predetermined time has elapsed after the starter is cut off. When this happens, the starter is re-energized and driven under the operation of the start operation mechanism, thereby connecting it to the engine, and connecting the starter and the engine together with the ignition circuit provided in the engine or the fuel injection circuit. Automatically energizes a quantity control circuit to start the engine, detects when the engine starts and cuts off energization to the starter, and after the vehicle starts, the vehicle is in a running state. The ignition circuit or the fuel injection amount control circuit is kept energized based on the detection result, and when the vehicle stops, the ignition circuit or the fuel injection amount control circuit is cut off. A method for automatically starting and stopping an automobile engine by stopping the engine.