JPS58164437A - Automobile engine controlling deivce - Google Patents

Abstract

PURPOSE:To maintain the function of a brake system and conseqently improve the safety of an automobile by a structure wherein positive or negative pressure is supplied to a brake toggle from a pump in order to secure the servo effect at the stall of an automobile engine. CONSTITUTION:The negative pressure hose 51 of a negative pressure pump 48 side is open through a check valve 49 to the atmosphere by a solenoid valve 50 due to OFF signals outputted from a discriminator circuit 52 during the engine 42 is running. When the rotational frequency of the engine 42 is below a predetermined frequency or the engine 42 is stopped and as a result the output of a comparator is ON and a relay is ON through a transistor, the port 53 open to the atmosphere of the solenoid valve 50 is closed and consequently negative pressure is supplied from the negative pressure pump 48 to the brake servo 41, resulting in causing to secure the servo effect of the brake toggle 41 and to maintain the function of a brake system even under the condition that the engine 42 is automatically brought into stall during speed reducting running or the like and consequently to enhance the safety of the automobile.

Description

[Detailed description of the invention] The present invention relates to an engine control device for an automobile.

As a conventional kernel seed device, for example, %m
There is something similar to that proposed in No. 30461.

This means that the intake throttle valve is fully closed and the gear position is new.

This system stops the engine by interrupting the fuel supply when the car is in 3rd, 4th, or 5th gear, or when the clutch is disengaged.If the engine stops while the car is running, the engine intake It was designed to utilize negative pressure and eliminate the negative pressure source for the nine brake boosters. Therefore, if the brake operation is repeated in this state, there is a problem in that the servo effect of the booster is lost and the force applied to the brake pedal increases.

The present invention has been made by focusing on these conventional problems, and includes a pump in the drive system between the clutch and the wheels, which are constantly rotating when the car is running, to prevent the engine from starting while the car is running. The purpose is to eliminate inconveniences caused by a decrease in servo effect by supplying positive pressure or negative pressure from the pump to the brake booster only when the brake booster is stopped.

The present invention will be explained in detail below based on an illustrated embodiment.

The throttle close switch 1 is turned ON when the intake throttle valve is closed, and the gear switch 2.3, 4, 5° 6, 1 is turned on when the transmission is in 3rd, 4th, 5th, reverse, and 1st gear. , when shifted to 2nd gear position, KONL, clutch disengagement switch 8,
Turns on when the clutch pedal is depressed to disengage the clutch.

The inverter 9 outputs the KONO signal when all of the gear switches 5, 6, and 7 are OFF, and the OR gate 1o outputs the KONO signal when any one of the gear switches 2, 3, and 4 is ON, or When the output of the inverter 9 is ON, KON is output.

The AND gate 11 outputs ON only when the output of the throttle closing switch 1 is ON and the output of the OR gate 1o is ON, thereby turning on the transistor 12 and energizing the relay 13.

14 is a fuel cut control circuit.

The relay 13 controls a fuel stop means (not shown), and when current flows through the relay 13, the fuel supply is interrupted and the engine is stopped. The fuel supply cutoff means may be a means for cutting off the current to the injector coil in a single fuel injection type engine, and a lunoid valve or the like for cutting off the fuel system in a carburetor type engine.

, On the other hand, by supplying the output voltage of the OL terminal of an alternator 21 driven by an engine (not shown) and the output voltage of the constant voltage circuit 220 to the comparator 23, the output voltage of the L terminal responsive to the engine speed can be adjusted from the constant voltage circuit 22. The output of the comparator 23 is turned ON when the output voltage is lower than the set voltage, and when the engine speed is below a predetermined value (stopped). Then, the gear switch) f5. The output of the AND gate 24 and the output of the comparator 23, which output ON when at least one switch of @, 7 and the clutch disengagement switch 8 are both ON, are supplied to the AND gate 25, and the output of the comparator 23 is supplied to the AND gate 25.
When the D gate 25 is turned on, the transistor 26 is turned on during running to operate the relay 21, thereby forming an engine restart control circuit 28 that drives a starter (not shown).

Further, the output of the comparator 280 of the engine restart control circuit 28 described above is supplied to the transistor 21, and when the transistor 29 is turned on, the relay 30 is operated.

On the other hand, negative pressure is supplied to a brake booster 41 installed in an automobile from an intake manifold 43 of an engine 42 via a negative pressure hose 45 equipped with a check valve 44, as in the conventional case. Then, the clutch 4 is connected to the engine 42'.
A negative pressure pump 4 is provided which is driven by the output shaft of a transmission 47 connected to the transmission via a check pulp 49 and an electromagnetic pump 49. By providing an on-off valve 50 and connecting it via a negative pressure hose 51, negative pressure can be supplied from the negative pressure pump 48.

In addition, since an OFF signal is output from the discrimination circuit 52 to the electromagnetic on-off valve 50 while the engine 42 is rotating, the negative pressure hose 51 on the negative pressure pump 48 side from the check valve 4s is opened to the atmosphere. , the engine speed drops below a predetermined value or the engine stops, the output of the comparator 23 turns ON, and the relay 30 turns ON via the transistor 2s.
When this happens, the atmosphere opening port '53 of the electromagnetic on-off valve 5◎ is closed, and negative pressure is supplied from the negative pressure pump 48 to the brake booster 41. 54 is the mask cylinder of the nibble booster 41, 55 is the grover shaft,
56 is a differential device, and 57 is a tire.

In the above configuration, when the automobile starts decelerating and the accelerator pedal is released, the throttle closing switch 1 is turned on. At this time, when the gear of the transmission is shifted to a running position such as 3° or 4.5 speed, the gear switch 2, 3
．． Since one of 4 is ON, OR gate 10
The output of the AND gate 11 becomes ON, and the output 4 of the AND gate 11 becomes ON. Then, the transistor 12 turns on and activates the relay 13, so the fuel supply is interrupted and the engine is stopped.

Further, when the accelerator pedal is depressed in this state, the throttle close switch 1-d (OFF) is turned off, so the output of the AND gate 11 is turned OFF, fuel supply is restarted, and the automobile is accelerated.

If the clutch is disengaged while the fuel is cut off, the engine will stop because the driving force from the tires will no longer be transmitted. Note that when the accelerator pedal is depressed and the clutch is engaged in order to re-accelerate, the fuel supply is restarted and at the same time the engine is cranked by the driving force from the tires, so the engine restarts. Furthermore, when the clutch is disengaged and the gear is shifted to the first or second gear, the clutch disengagement switch 8 is turned on, and either one of the gear switches 6 and 7 is turned on, so that the output of the AND gate 24 is turned on. In this state, the engine is stopped and the voltage at the L terminal of the alternator 21 is lower than the set voltage, so the output of the comparator 23 is turned on, and the output of the AND gate 25 is turned on.

Therefore, the transistor 26 is turned on, the relay 21 is activated, the starter motor is driven, and the engine is restarted. When the engine is restarted, the L terminal voltage of the alternator 21 becomes higher than the set voltage, so the comparator 2
The output of AND gate 25 becomes OFF and the output of AND gate 25 becomes OFF.
Becomes FF. To round this off, the starter motor will automatically stop after the restart is complete.

Also, when the transmission 1r is downshifted to 1st or 2nd speed,
Rounding when either gear switch 6 or 7 is turned on,
The output of inverter 9 is turned off.

At this time, the output of the OR gate 10 is also OFF, so the fuel cut is canceled. Therefore, when the starter is driven, the engine is restarted without depressing the accelerator pedal. On the other hand, when the transmission is in 1st, 2nd, or reverse position during deceleration, either the gear switch 5 or 6.7 is turned ON and the output of the inverter 9 is turned OFF.
0 becomes OFF, and the output of AND gate 11 becomes OFF.
Becomes FF. Rounding this to 1 is that the engine is not stopped at this time, but the engine is stopped when the transmission is returned to neutral before or after the vehicle stops and the output of the inverter 9 is turned on.

When the clutch is disengaged and the gear is put into reverse, 1st or 2nd gear in order to start, the starter motor is started as described above and the engine is restarted, making it possible to start the vehicle.

In addition, it has a recovery function due to a drop in engine speed when in 1st and 2nd gears! ! If you cut all the fuel, you can further reduce fuel consumption and reduce the starting time by the starter motor by 1.2
The starting speed by the driving force from the tires may be set to 3, 4, or 5 speed.

During deceleration as described above, when the gear position is 3, 4, or 5 and the clutch is disengaged or the transmission is in neutral, the driving force from the tires 57 is not transmitted to the engine 42, so the engine 42 The rotation completely stops, and the negative pressure in the intake manifold 43 becomes atmospheric pressure. Therefore, in such a case, the supply of negative pressure to the brake booster 41 is stopped, but as the engine 42 stops, the L terminal voltage of the alternator 21 drops below the set value, so the output of the comparator 23 decreases. is turned on, and the relay 30 is turned on via the transistor 29.

Further, since the negative pressure pump 48 is rotationally driven by the output shaft of the transmission 47, which is constantly rotating while the automobile is running,
As mentioned above, the relay 30 is turned on and the electromagnetic on-off valve 50 is turned on.
When a current flows, the negative pressure of the negative pressure pump 48, which was previously open to the atmosphere, is transmitted to the brake booster 41. For this reason, even if the engine 42 stops due to deceleration driving, the negative pressure pump 4
8 continues to supply negative pressure to the brake booster 41, the desired servo effect is maintained. Note that during normal driving, that is, when the engine 42 is running, the electromagnetic on-off valve 50 opens the atmosphere opening 53 and puts the negative pressure pump 48 under no load. It is possible to eliminate output loss due to the provision.

In the above embodiment, negative pressure is supplied to the brake booster, but if the booster is of a positive pressure type, a positive pressure pump can be used instead of the negative pressure pump. Nor.

As explained above, according to the present invention, a pump is provided in the drive system after the clutch, which is constantly rotating while the vehicle is running, and when the engine is stopped, the pump provides brake boost. Since positive pressure or negative pressure is supplied to the device to ensure the servo effect of the booster, the function of the brake system is maintained even when the engine is automatically stopped during deceleration driving, thereby increasing the safety of the vehicle. can be improved.

Also, while the engine is rotating, the pressure generating port of the pump is open to the atmosphere and the pump is operated without load.
There is no increase in engine load due to the addition of a pump, and there is no fear that the engine's fuel efficiency will suddenly stop.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram of an embodiment of the present invention, and FIG. 2 is a configuration diagram of a negative pressure supply system. 1...Throttle close switch 2, 3, 4,
5゜6.7... Gear switch 8... Clutch disengagement switch 13... (Fuel cut) relay 21
...Alternator 2T...(Starter activation) Relay 30...(Solenoid valve) Relay 41...Brake booster 42...Engine 45.51...
・Negative pressure hose 46...Clutch 41...Transmission 48...Negative pressure pump 4t...Check valve
50... Solenoid closing valve 52... Discrimination circuit 53
...Atmospheric opening patent applicant Fujio Sasashima, patent attorney for Nissan Mekdo Co., Ltd.

Claims (1)

[Claims] Automobiles equipped with a stop-start device that automatically stops the engine when a predetermined stopping condition is satisfied and the engine dies, and also automatically start the engine when a start operation is detected, are used as brake boosters for automobiles. A pump that supplies positive or negative pressure is provided in the drive system from the clutch to the wheels, and an on-off valve is provided to open the signal path from the pump-41 to the brake booster to the atmosphere, and the rotation of the engine is controlled. An engine control device for an automobile, comprising means for detecting and opening the on-off valve.