JPH11141367A - Automatic stopper and automatic starter for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically stop an internal combustion engine and automatically start it after stopping, which are not implemented in an automatic transmission vehicle so far and to prevent air pollution by providing a logic means which automatically stops the internal combustion engine (t) second later when the vehicle is in a brake operation state and the speed becomes 0 value. SOLUTION: In driving a vehicle, a logic means 11 of a control circuit 10 incorporates the outputs of a brake sensor 2, a vehicle speed sensor 4, and a restarting switch 1. When the vehicle becomes in a brake operation state and a stop state and it passes (t) seconds (for example, 1.5 seconds) after the vehicle speed becomes 0 value, a control signal is sent to an automatic shift control means 9, assuming that a driver operates a brake from the intention of the stop. The shift gear of a transmission 8 is set to in N position regardless of the position of the shift lever 3, a fuel cutoff valve 6 is closed, and a fuel supply is shut off so that the internal combustion engine is automatically stopped. After that, when the restart switch 1 is operated, a starting electric motor 7 is so as to start the internal combustion engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applied to automobiles. The present invention is an apparatus developed for a vehicle used for a regular bus traveling in the city, but can be widely applied to vehicles other than the vehicle for the regular bus. The present invention automatically stops the operation of an internal combustion engine under a certain condition without performing a stop operation of the internal combustion engine (including a gasoline engine and a diesel engine). It relates to a device for automatically restarting under conditions. The present invention is an apparatus for use in an automatic vehicle without a clutch pedal.

[0002]

2. Description of the Related Art In a regular bus that runs in the city, an internal combustion engine that is idling is stopped to reduce air pollution or carbon dioxide emissions even when a passenger stops at a stop and gets on and off the passenger. Is recommended. However, since the operation for stopping and restarting the internal combustion engine is troublesome, a device for automatically stopping and restarting the internal combustion engine under certain conditions has been used.

[0003] Such a device is provided with a logic circuit using a processor, and after a service brake is depressed, a clutch is depressed, and the vehicle speed is reduced to zero, the vehicle speed is reduced.
When the clutch pedal is released after setting the transmission gear to the neutral position, the operation of the internal combustion engine is automatically stopped. Then, when the clutch pedal is depressed in the state of the automatic stop, the internal combustion engine is automatically restarted. This automatic stop device or automatic start device automatically stops and restarts the internal combustion engine without any special operation by the driver when the bus stops at a stop for passengers getting on and off.

[0004]

The above-mentioned apparatus has been widely used for a regular bus for city driving. Such equipment is also installed in large commercial vehicles such as trucks, and automatically stops and restarts the internal combustion engine without any special operation during signal waiting or traffic congestion. Now being used. However, in an automatic vehicle without a clutch pedal, it is impossible to automatically stop and restart the internal combustion engine based on the logic related to the operation of the clutch pedal.

The present invention has been made in view of such a background, and an object of the present invention is to provide an automatic stop device and an automatic start device of an internal combustion engine for use in an automatic vehicle without a clutch pedal. An object of the present invention is to provide an apparatus for automatically stopping an internal combustion engine stopped in an automatic vehicle and restarting the internal combustion engine after the automatic stop.

[0006]

SUMMARY OF THE INVENTION According to the present invention, an internal combustion engine of an automatic vehicle without a clutch pedal is automatically stopped when certain conditions are satisfied, and when the certain conditions are satisfied in the automatic stop state. It is characterized by restarting.

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

It is desirable to have means for automatically setting the shift gear to the neutral position before the internal combustion engine is stopped by activating the logic means regardless of the set position of the shift lever. When the internal combustion engine stops, the control oil pressure drops rapidly. Therefore, it is preferable to set the transmission gear before, preferably immediately before, the stop.

A second aspect of the present invention is an automatic starter for an internal combustion engine, which is provided with a switch operated by a driver with his / her left foot. And a logic means for automatically starting the internal combustion engine when the switch operated by the left foot is operated when is operated.

Preferably, the logic means for starting includes means for automatically setting a shift gear to a set position of the shift lever after starting the internal combustion engine.

A third aspect of the present invention is a device for temporarily disabling automatic stop of an internal combustion engine, wherein a switch operated by a left foot is operated when a vehicle speed becomes zero with a brake applied. Means for prohibiting automatic stop of the internal combustion engine when it is set.

When there is no output indicating that the brake pedal is depressed and the brake is in operation, and there is no restart instruction input by a switch operated with the left foot, the time when the vehicle speed shows zero value by the brake operation is determined. When the reference value has passed for t seconds (for example, 1.5 seconds) at zero value, the internal combustion engine is automatically stopped assuming that the driver intends to stop.

When the automatic stop of the internal combustion engine is performed, no matter what position the shift lever is set,
Automatically set the transmission gear to the neutral position. This can prevent the vehicle from starting for some reason.

The switch operated by the left foot while the brake pedal is depressed is operated in a state in which the internal combustion engine is automatically stopped by elapse of t seconds from the time when the vehicle speed shows a zero value by the brake operation. In some cases, the internal combustion engine is started without performing a normal start operation, assuming that the driver intends to start. As described above, the starting operation is performed in a state where the brake pedal is depressed and the brake is operated, so that a safe state can be maintained.

When the internal combustion engine is automatically started in this way, the transmission gear that was in the neutral position at the time of automatic stop is automatically shifted to the position where the transmission lever is set.
However, if the shift lever is in the neutral position, the neutral position is continued. As described above, when the automatic stop is performed, the transmission gear position is in the neutral position, and after the automatic start is performed by a switch operation conscious of the driver's start, the transmission gear is set to the position intended by the driver. However, it is not necessary to perform the gear operation each time, and it is possible to prevent the vehicle from suddenly starting.

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, when the switch is operated before the vehicle speed becomes zero, the driver stops the internal combustion engine automatically. The automatic stop operation is prohibited as an intention not to perform. By this prohibition operation, the automatic stop is performed when the vehicle is to be stopped for a very short time, and the useless operation of automatically starting immediately thereafter can be avoided.

As described above, according to the present invention, even an automatic vehicle without a clutch pedal can automatically stop the internal combustion engine during a stop and automatically start after the automatic stop, thereby reducing air pollution or carbon dioxide. Vehicle operation can be performed according to the social background that reduces emissions.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention, and FIG. 2 is a diagram showing an arrangement position of a restart switch in a cab of the embodiment of the present invention.

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

When the output of the brake sensor 2 is in the brake operating state and the vehicle speed reaches a zero value, the control circuit 10 keeps at a zero value until t seconds (for example, 1.5 seconds) elapse from the base point. Means for automatically stopping the internal combustion engine, means for automatically starting the internal combustion engine when the restart switch 1 is operated in a state where the internal combustion engine is automatically stopped, and restart switch 1 operated by the left foot. A logic means 11 including means for automatically starting the internal combustion engine when operated, and a logic means 11 for automatically setting the shift gear to a neutral position before the internal combustion engine is stopped regardless of the set position of the shift lever 3. Means for automatically setting the shift gear to the set position of the shift lever 3 after the start of the internal combustion engine, and the restart switch 1 operated by the left foot when the vehicle speed becomes zero. In when it is operated include a means for inhibiting the automatic stop of the internal combustion engine.

The control circuit 10 includes a restart switch 1 operated by the driver with the left foot, a brake sensor 2 for detecting the operating state of the brake, a shift lever 3 for setting a shift position, and a vehicle speed sensor for detecting the running speed of the vehicle. 4 and the output of an idle stop switch 5 for starting or stopping the idle stop system. The idle stop switch is a manual switch provided on the dashboard of the driver's seat, and is used to turn the entire system on and off.

The control circuit 10 controls the fuel cutoff valve 6 for shutting off the supply of fuel to the internal combustion engine, the starting motor 7 for starting the internal combustion engine, and the automatic shift control for operating the transmission 8 for automatic shifting. A control signal is sent to the means 9.

Next, the operation of the embodiment of the present invention configured as described above will be described. FIG. 3 is a flowchart showing a flow of an automatic stop operation of the internal combustion engine in the embodiment of the present invention;
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 stop operation of the internal combustion engine according to the embodiment of the present invention will be described with reference to FIGS. The logic means 11 of the control circuit 10 receives the outputs of the brake sensor 2, the vehicle speed sensor 4, and the restart switch 1, outputs an ON signal (1) indicating that the brake is in operation, and indicates that the vehicle is in a stopped state. Is output, and an off signal (0) indicating that the restart switch 1 is not depressed is output, and the vehicle speed is reduced to a predetermined value v _0.
From the time point when the first zero value is reached (for example, 1.5 seconds).
Second), it is assumed that the driver has performed a brake operation with the intention of stopping the vehicle, and a control signal is sent to the automatic transmission control means 9 to shift the position of the transmission lever 3 (1, 2, D, R). Regardless, the transmission gear of the transmission 8 is automatically set to the neutral position, and a control signal is sent to the fuel cutoff valve 6 to cut off the fuel supply and stop the internal combustion engine. This fuel cutoff valve 6 is automatically opened after the automatic stop. This does not prevent the driver from starting manually.

When the restart switch 1 has been operated before the vehicle speed becomes zero, that is, when the vehicle speed sensor 4 is already operating before the vehicle speed becomes zero, the signal (0) indicating that the vehicle speed sensor 4 is stopped is output. Since the output of the restart switch 1 indicates the ON signal (1), no control signal is output to the fuel cutoff valve 6, and the automatic stop of the internal combustion engine is prohibited.

Such an operation is carried out, for example, in the case of a very short stop with about one or two passengers on a route bus, and by this operation, the automatic start immediately after the automatic stop of the internal combustion engine. Useless operations such as performing

Next, an automatic start operation of the internal combustion engine according to the embodiment of the present invention will be described with reference to FIGS.
When the idle stop switch 5 provided in the driver's seat is operated to output an ON signal for setting the automatic shift mode, the brake pedal is depressed to operate the brake and the internal combustion engine is stopped. When the restart switch 1 is operated, the logic means 11 sends a control signal to the fuel cutoff valve 6 and the starting motor 7 to open the fuel cutoff valve 6 and drive the starting motor. Automatically start the internal combustion engine.

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

[0030]

As described above, according to the present invention, the internal combustion engine can be automatically stopped and started after the automatic stop, which has not been conventionally performed in an automatic vehicle, and air pollution or carbon dioxide emission can be reduced. Vehicles can be operated in accordance with the social background to be reduced.

Further, when the vehicle is stopped for a very short time in the operation of the vehicle, the automatic stop is prohibited by the switch operation with the open left foot, so that the useless automatic stop and automatic start of the internal combustion engine can be avoided. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement position of a restart switch in a driver's seat according to the embodiment of the present invention.

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

FIG. 4 is a flowchart showing a flow of an automatic start operation of the internal combustion engine in the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 restart switch 2 brake sensor 3 shift lever 4 vehicle speed sensor 5 idle stop switch 6 fuel cutoff valve 7 starting motor 8 transmission 9 automatic shift control means 10 control circuit 11 logic means

Claims (5)

[Claims] 1. An internal combustion engine according to claim 1, further comprising logic means for automatically stopping the internal combustion engine t seconds after the output of the brake sensor is in a brake operating state and the vehicle speed becomes zero. Automatic stop device. 2. A means for automatically setting a shift gear to a neutral position before the internal combustion engine is stopped by said logic means regardless of a set position of a shift lever.
An automatic stop device for an internal combustion engine according to claim 1. 3. A switch operated by the driver with his / her left foot is provided, and when the switch is operated in a state where the internal combustion engine is stopped by the automatic stop device according to claim 1, the internal combustion engine is automatically started. An automatic starting device for an internal combustion engine, comprising a logic unit for causing the internal combustion engine to start. 4. The automatic starting apparatus for an internal combustion engine according to claim 3, wherein said automatic starting logic means includes means for automatically setting a transmission gear to a setting position of a shift lever after the internal combustion engine is started. 5. The automatic stop device according to claim 1, further comprising means for prohibiting automatic stop of the internal combustion engine when the switch operated by the left foot is operated when the vehicle speed becomes zero.