KR100320374B1 - Automatic stop and automatic start of internal combustion engine - Google Patents

Abstract

An object of the present invention is to perform automatic stop and automatic start of an internal combustion engine of an automatic vehicle without a clutch pedal.

To solve this problem, the output of the brake sensor shows the brake operating state, and the internal combustion engine is automatically stopped when t seconds have elapsed when the vehicle speed became zero. In addition, when the internal combustion engine is automatically stopped, the switch operated by the driver with the left foot is operated to automatically start the internal combustion engine when a start signal is output.

Description

Automatic stop and auto start of internal combustion engine

The present invention is used in automobiles. The present invention is a device developed for a vehicle used for a regular bus running in the city, but can be widely applied to a vehicle other than the vehicle for the regular bus. The present invention automatically stops the operation of the internal combustion engine in a certain condition without stopping the operation of the internal combustion engine (including gasoline engine and diesel engine), and automatically starts again in a constant condition for the automatically stopped internal combustion engine. An apparatus for making The present invention is a device for use in an automatic car without a clutch pedal.

Regular buses running in the city are encouraged to stop the internal combustion engines in the idling state in order to reduce air pollution or carbon dioxide emissions even when the passengers stop at the stops. However, since the operation operation for stopping and restarting the internal combustion engine is cumbersome, an apparatus for automatically stopping and restarting the internal combustion engine under certain conditions has been used.

Such a device is equipped with a logic circuit using a processor, presses the service brake, depresses the clutch, decelerates the vehicle speed to zero, and sets the transmission gear to the neutral position, then releases the clutch pedal. And to stop driving. Then, when the clutch pedal is pressed in the automatic stop state, the internal combustion engine is configured to restart automatically. This automatic stop device or automatic start device automatically stops and restarts the internal combustion engine without the driver's special operation when the bus stops at the stop for passengers to get on and off.

Such a device has been widely used in regular buses for city driving. Such a device is also equipped with a large commercial vehicle such as a track, and is used as a device for automatically stopping and restarting the internal combustion engine without special driving operation during signal waiting or road jams. However, in an automatic vehicle without a clutch pedal, the automatic combustion and automatic restart of the internal combustion engine cannot be performed by the logic related to the operation of the clutch pedal.

SUMMARY OF THE INVENTION The present invention has been made in this background and an object thereof is to provide an automatic stop device and an automatic start device of an internal combustion engine for use in an automatic car without a clutch pedal. An object of the present invention is to provide an apparatus for performing an automatic stop of an internal combustion engine which is stopped in an automatic vehicle and restarting after an automatic stop.

The present invention is characterized in that an internal combustion engine of an automatic vehicle without a clutch pedal is automatically stopped when certain conditions are established, and restarted when certain conditions are established in this automatic stop state.

That is, the first aspect of the present invention is an automatic stop device of an internal combustion engine, comprising a logic means for automatically stopping the internal combustion engine after t seconds when the output of the brake sensor is in the brake operating state and the vehicle speed becomes zero. It features. That is, when the vehicle speed exceeds a predetermined value and the vehicle speed becomes the first zero value and then the vehicle speed becomes the zero value over t seconds, the internal combustion engine is automatically stopped without operation.

Regardless of the shift lever setting position, it is preferable to have a means for automatically setting the shift gear to the neutral position before the logic means starts and the internal combustion engine stops. When the internal combustion engine stops, the control hydraulic pressure drops rapidly, so it is preferable to set the transmission gear just before stopping.

According to a second aspect of the present invention, there is provided an automatic starting device for an internal combustion engine, the switch being provided by the driver with its left foot, the internal combustion engine being automatically stopped by the logic means, and the brake being operated when the brake is operating. And a logic means for automatically starting the internal combustion engine when the switch operated by the left foot is operated.

The starting logic means preferably includes means for automatically setting the transmission gear to the set position of the shift lever after the start of the internal combustion engine.

A third aspect of the present invention is a device for temporarily disabling automatic stop of an internal combustion engine, and when the switch operating with the left foot is operated when the speed of the vehicle becomes zero when the brake is in operation, the automatic stop of the internal combustion engine is operated. Characterized in that it comprises a means for prohibiting.

There is an output indicating that the brake pedal is in operation when the brake pedal is stepped on, and t seconds (starting at the time when the vehicle speed indicates 0 value by brake operation in the absence of an instruction input for restart by the switch operated by the left foot) For example, 1.5 seconds), when the vehicle has passed 0, the internal combustion engine is automatically stopped as the driver intends to stop.

When such automatic stop of the internal combustion engine is performed, the shift gear is automatically set to the neutral position even if the shift lever is set at any position. This avoids starting the vehicle for any reason.

The driver starts the vehicle when the internal combustion engine is in the auto-stop state when t seconds have elapsed from the time when the vehicle speed indicated the zero value by the brake operation, and the switch operated by the left foot was operated while the brake pedal was pressed. As intended, the internal combustion engine can be started without normal starting operation. In this way, the starting operation is performed while the brake pedal is stepped on and the brake is operated, so that a safe state can be maintained.

In this way, when the internal combustion engine starts automatically, the gear shift that was in the neutral position at the time of automatic stop is automatically put in the position where the shift lever is set. However, if the shift lever is in the neutral position, the shift lever is kept in the neutral position. In this way, when the automatic gear stop is in the neutral position and the automatic gear is started by the switch operation in consideration of the driver's starting, the gear does not need to be operated every time because the gear is set to the position intended by the driver. At the same time, it is possible to avoid the vehicle starting suddenly.

When the switch operated by the left foot is operated at the time when the vehicle speed becomes zero by the brake operation, that is, before the vehicle speed becomes zero, the driver does not automatically stop the internal combustion engine, and the automatic stop operation is prohibited. By this prohibition operation, when stopping for only a very short time, automatic stop is performed, and useless operation such as automatic start can be avoided immediately thereafter.

As described above, according to the present invention, even an automatic car without a clutch pedal can perform automatic stop and automatic start of the internal combustion engine while it is stopped, and can reduce air pollution or carbon dioxide emissions.

1 is a block diagram showing the main components of an embodiment of the present invention;

2 is a view showing an arrangement position in a driver's seat of a restart switch of the embodiment of the present invention;

3 is a flowchart showing the flow of automatic stop operation of the internal combustion engine of the embodiment of the present invention.

Fig. 4 is a flowchart showing the flow of the automatic starting operation of the internal combustion engine of the embodiment of the present invention.

※ Explanation of symbols about main part of drawing ※

1: Restart switch 2: Brake sensor

3: shift lever 4: vehicle speed sensor

5: Idle stop switch 6: Fuel shutoff valve

7: starting motor 8: transmission

9: automatic shift control means 10: control circuit

11: logic

(Example)

The following describes an embodiment of the present invention based on the drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the main structure of an embodiment of the present invention, and Fig. 2 is a view showing a position where a restart switch is disposed in a cab in an embodiment of the present invention.

In the embodiment of the present invention, the driver's seat is provided with a restart switch 1 as a switch operated by the driver's left foot, and is provided with a control circuit 10 for controlling the automatic stop and automatic start of the internal combustion engine for inserting control information.

The control circuit 10 has an internal combustion when the output of the brake sensor 2 is in the brake operation state and continues to be zero until t seconds (for example, 1.5 seconds) elapses from the time when the vehicle speed becomes zero. Internal combustion engine when the means for automatically stopping the engine, the means for automatically starting the internal combustion engine when the restart switch 1 is operated while the internal combustion engine is automatically stopped, and the restart switch 1 operated with the left foot are operated. Logic means 11 including a means for automatically starting the engine, and the gear is automatically set to the neutral position before the internal combustion engine is stopped by the logic means 11, regardless of the setting position of the shift lever 3. Means for automatically setting the transmission gear to the set position of the shift lever 3 after starting the internal combustion engine, and the restart switch 1 operated with the left foot is adjusted when the vehicle speed becomes zero. When there is included means for prohibiting the automatic stop of the internal combustion engine.

The control circuit 10 includes a restart switch 1 for the driver to operate with the left foot, a brake sensor 2 for detecting the operating state of the brake, a shift lever 3 for setting the shift position, and a vehicle speed for detecting the traveling speed of the vehicle. The output of the sensor 4 and the idle stop switch 5 which starts or stops an idle stop system is connected. The idle stop switch is a manual switch provided on the driver's dash board and is used to turn the whole system on and off.

In the control circuit 10, an automatic shift control means for automatically shifting the fuel shut-off valve 6 for interrupting fuel supply to the internal combustion engine, the starting motor 7 for starting the internal combustion engine, and the transmission 8 for automatic transmission. A control signal is sent to (9).

The following describes the operation of the embodiment of the present invention configured as described above. 3 is a flowchart showing the flow of the automatic stop operation of the internal combustion engine in the embodiment of the present invention, and FIG. 4 is a flowchart showing the flow of the automatic start operation of the internal combustion engine in the embodiment of the present invention.

First, the automatic combustion engine automatic stop operation according to the embodiment of the present invention will be described with reference to FIGS. 1 and 3. The logic means 11 of the control circuit 10 inserts the outputs of the brake sensor 2, the vehicle speed sensor 4 and the restart switch 1, and outputs an on signal 1 indicating that the brake is in an operating state. Outputting a stop signal O indicating that the vehicle is in a stopped state and outputting an off signal O indicating a state in which the restart switch 1 is not pressed, and the vehicle speed is first determined at a predetermined value v _o . When t seconds have elapsed (for example, 1.5 seconds) after 0, it is determined that the driver has intentionally stopped the brake and sends a control signal to the automatic transmission control means 9, whereby the position of the shift lever 3 Regardless of (1, 2, D, R), the transmission gear of the transmission 8 is automatically set to the neutral position, the control signal is sent to the fuel shutoff valve 6, and the fuel supply is cut off to stop the internal combustion engine. . This fuel shutoff valve 6 is automatically released after automatic stop. This prevents the driver from starting the vehicle by manual operation.

When the restart switch 1 is operated beforehand when the vehicle speed reaches zero, that is, before the vehicle speed exhibits the zero value, the restart switch 1 may be output even if the vehicle O sensor 4 outputs a signal O indicating the stop state. Output of the control signal to the fuel cutoff valve 6 is not output and automatic stop of the internal combustion engine is prohibited.

Such operation is performed in the case of an extremely short stop having, for example, one or two passengers on a route bus, and as this operation is performed, it is possible to avoid the unnecessary operation of automatically starting immediately after the internal combustion engine is automatically fixed. Can be.

Next, with reference to Figures 1 and 4 will be described for the automatic start operation of the internal combustion engine according to the embodiment of the present invention. When the idle stop switch 5 provided in the driver's seat is operated to output the ON signal for setting the automatic shift mode, the brake pedal is stepped on and the brake is activated to restart the engine when the internal combustion engine is stopped. Is operated, the logic means 11 sends a control signal to the fuel shutoff valve 6 and the starting motor 7, keeps the fuel shutoff valve 6 closed, and drives the starter motor to operate the internal combustion engine. Start up automatically.

When the internal combustion engine starts automatically, a control signal is sent to the automatic transmission control means 9, and the transmission gear is automatically set from the neutral position to the lever setting position.

As described above, according to the present invention, the automatic combustion of the internal combustion engine which has not been carried out in the conventional automatic car and the start after the automatic stop can be performed.

In addition, when stopping the vehicle for a very short time in driving operation, automatic stop is prohibited by the switch operation by the left foot, so that unnecessary stop of the internal combustion engine and automatic start can be avoided.

Claims (4)

And a control device for controlling the automatic stop and automatic start of the internal combustion engine of a vehicle having an internal combustion engine and an automatic transmission, the control device having a signal of a restart switch, a brake center, a shift lever position, a vehicle speed sensor, and an idle stop switch. In the vehicle that receives the control, the fuel shutoff valve, the starting motor, the automatic transmission, When the output of the brake sensor is in the brake operating state, the internal combustion engine is automatically stopped after t seconds at the time when the vehicle speed becomes zero, and in that state when the restart switch operated by the driver with the left foot is operated. Automatic stop of the internal combustion engine, characterized in that it has a logic means for automatically starting. The method of claim 1, And a means for automatically setting the transmission gear to the neutral position before the internal combustion engine stops by the logic means irrespective of the setting position of the shift lever. The method of claim 1, And said automatic means for starting automatically comprises means for automatically setting the transmission gear to the set position of the shift lever after the start of the internal combustion engine. The method of claim 1, And a means for prohibiting automatic stop of the internal combustion engine when the restart switch operated by the left foot is operated at the time when the vehicle speed becomes zero.