JPH11151949A - Engine control device for at (automatic transmission) mounting vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To present an unexpected accident by a wrong start surely further with a cost reduced in an AT mounting vehicle during stopping by only a parking brake left as in a running position during rotation of an engine. SOLUTION: In an AT mounting vehicle, a control unit 9 is equipped such that while an engine is in rotation, an AT position is set to a position except a parking or neutral position, and when the vehicle is placed in a condition during stopping by only a parking brake, in the case of detecting moving of the vehicle, a contact of a power cutoff relay 7 is opened, the engine is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device for preventing an erroneous start in a vehicle equipped with an automatic transmission (AT).

[0002]

2. Description of the Related Art In an AT-equipped vehicle, for example, when a vehicle is stopped by using a service brake at a traffic light or the like, the service brake is released after the parking brake is applied, and A
The T position is the same as the previous driving position,
Until the signal is switched, the vehicle can be stopped only by the parking brake.

[0003]

As described above, when the engine is rotating, the AT position switch is set to a traveling position other than parking or neutral, and the vehicle is stopped only by the parking brake without using the service brake. In the event of an accident, if the load increases due to the operation of the air conditioner, etc., the engine speed will increase, and the driving torque output from the engine exceeds the braking torque of the parking brake, the vehicle will start accidentally and an unexpected accident will occur. May be caused. Such a problem also occurs due to poor adjustment of the parking brake or the like.

In view of this, it is conceivable to control the engine rotation according to the operating state of the load while the vehicle is stopped. However, there is a possibility that the vehicle may start erroneously even with a momentary torque fluctuation. This is necessary, and in some cases, it is necessary to perform slightly different control for each individual vehicle, and there is a problem that it is difficult to reduce the cost.

Accordingly, an object of the present invention is to solve the above-mentioned problem, and it is possible to surely prevent an accidental accident due to an erroneous start in an AT-mounted vehicle stopped only by a parking brake in a running position while the engine is rotating. An object of the present invention is to provide an engine control device for an AT-equipped vehicle that has excellent versatility that can be used commonly in various types of vehicles and that can improve safety at a low cost.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide an image processing apparatus comprising:
An engine control device for a T-equipped vehicle, which stops the engine when the movement of the vehicle is detected while the engine is rotating, the AT position is other than parking or neutral, and the vehicle is stopped only with the parking brake. This is achieved by an engine control device for an AT-equipped vehicle, which has a control unit.

[0007] According to the above configuration, the A is stopped at a position other than the parking or neutral position (normally, the running position) while the engine is running, and is stopped only by the parking brake.
In a T-equipped vehicle, when the engine rotation speed increases and the driving torque output from the engine exceeds the braking torque of the parking brake and the vehicle moves, the control unit stops the engine and the vehicle starts moving. Will be blocked. Therefore, it is possible to reliably prevent an accidental accident caused by an erroneous start in a stopped AT-equipped vehicle with only the parking brake.

In addition, since the power supply is stopped by detecting the movement of the vehicle, it can be operated irrespective of the load capacity of the installed air conditioner or the output balance with the engine. It has excellent versatility and can improve safety at low cost.

The control unit stops the engine by opening a contact of a normally closed power cutoff relay provided in a power supply path between an ignition-on contact of a key switch of the vehicle and an electric component for driving the engine. Configuration. With this configuration, the operation of stopping the power supply to the engine drive electrical component by the relay can be realized very instantly, and the engine stop process can be speeded up.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an engine control apparatus for an AT-equipped vehicle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of an engine control device for an AT-equipped vehicle according to the present invention. The engine control device 1 of this embodiment includes a normally-closed power cut-off relay 7 provided in a power supply path 5 from an ignition-on contact 2 of a key switch of a vehicle to various electric components for driving the engine, And a control unit (ECU) 9 for controlling the operation of the power cut-off relay 7.

When the ignition-on contact 2 is turned on (in FIG. 1, it shows a non-conducting state), the control unit 9 supplies a built-in power supply to a battery 12 mounted on the vehicle via a power supply line 10. Connected and activated.
The power cut-off relay 7 is normally in a state in which the contacts are closed (FIG. 1 shows a state in which the contacts are opened). Therefore, the ignition-on contact 2 is turned on (ON) by a driver's key operation. ), Power is supplied from the battery 12 to various electrical components for driving the engine, and the engine is started.

The control unit 9 includes an alternator 14
, The operating state of the engine (whether the engine is rotating) is monitored by the selected position of the AT position switch 15, and the service brake switch 17 which is activated by depressing the brake pedal. The operation state of the service brake is monitored based on whether the vehicle is on, and the operation state of the parking brake is monitored based on whether the parking brake switch 18 operated by operating the parking brake lever or the like is on. Further, the moving operation (starting operation) of the vehicle is monitored by the speed sensor 19 for a speedometer. Regarding the movement of the vehicle, in addition to the speedometer, for example,
A wheel rotation detection sensor can also be used.

The control unit 9 determines that the AT position switch 15 is set to a position other than parking or neutral (ie, a forward or reverse running position) while the engine is rotating, and that the service brake is not used. In a state where the vehicle is stopped with only the parking brake, when the movement of the vehicle is detected, the contact of the power cutoff relay 7 is opened, and the engine is stopped by cutting off the power supply to the electrical components for driving the engine.

The control unit 9 is, as shown in FIG.
The control process is performed according to the procedure shown in FIG. That is, first, it is determined whether or not the engine is rotating based on the L terminal signal of the alternator 14 (step 101). It is determined whether or not the vehicle is in a stopped state based on the determination (step 102). If the vehicle is in a stopped state, subsequently, it is determined from the operation state of the parking brake switch 18 whether or not the parking brake is being used (step 102). Step 1
03) If the parking brake is being used, it is further determined whether or not the service brake has been released (step 104).
Further, it is determined whether or not the selected position of the AT position switch 15 is a position other than parking or neutral (step 105). If the selected position of the AT position switch 15 is a position other than parking or neutral (that is, a running position). Then, it is again determined whether or not the vehicle is moving by the speed sensor for speedometer 19 (step 106). If the vehicle is detected to be moving, the contact of the power cutoff relay 7 is immediately opened to drive the engine. The power supply to the various electrical components is interrupted (step 107).

If the power supply to the various electric components for driving the engine is cut off in step 107, the electric processing operations (for example, ignition processing, etc.) necessary for the rotation of the engine cannot be executed. The vehicle stops and the vehicle is stopped.

After the processing of step 107, it is first determined whether or not the power cutoff relay 7 is operating (that is, the contacts of the power cutoff relay 7 are being opened) (step 108). Then, it is determined whether or not the service brake is being depressed (step 109). And
If the service brake is being depressed, the power cut-off relay 7 is released from operation, the contact of the power cut-off relay 7 is returned to the conductive state, and a series of processing ends.

If it is determined in step 101 that the engine has stopped, the routine proceeds to step 102.
In step 103, it is determined that the parking brake is not in operation, in step 103, it is determined that the service brake is in use, in step 104, it is determined that the service brake is in use. If it is determined that the selected position of the position switch is the parking position or the neutral position, or if it is determined in step 106 that the vehicle is in the stopped state, the process immediately proceeds to step 108 in any case. .

If it is determined in step 108 that the power cutoff relay 7 has already been released from operation (that is, the contact has been opened), or if the service brake has not been depressed in step 109. If it is determined, the process is immediately terminated.

According to the above-described engine control device 1, in an AT-equipped vehicle that is stopped only with the parking brake while the engine is rotating while the engine is rotating, the load increases due to the operation of the air conditioner or the like, and the engine speed increases. When the driving torque output from the engine exceeds the braking torque of the parking brake and the vehicle moves, the contact of the power cutoff relay 7 is immediately opened to stop the engine and prevent the vehicle from starting. . Therefore, it is possible to reliably prevent an accidental accident caused by an erroneous start in a stopped AT-equipped vehicle with only the parking brake.

Furthermore, since the engine is stopped by stopping power supply to the electric system to stop the vehicle from starting, the mechanical strength of the components of the brake device is lower than that of the conventional countermeasures for enhancing the braking performance of the parking brake. No improvement is required.

In addition, since the power supply is stopped by detecting the movement of the vehicle, the system can operate regardless of the load capacity of the air conditioner or the like and the output balance between the air conditioner and the engine. It has excellent versatility that can be used in common, and cost reduction can be achieved by mass production, and safety can be improved at low cost in AT-equipped vehicles.

Further, the operation of stopping the power supply to the engine drive electrical components by the relay 7 can be realized very instantaneously.
The engine stop process can be speeded up.

In FIG. 2, step 10
A series of processes from 1 to 107 is a process for immediately stopping the engine when an erroneous start occurs in the vehicle to prevent an accidental accident caused by the erroneous start. Further, a series of processes from step 108 to step 110 is a return process after the engine stop process according to the present invention, and the presence or absence of stepping down of the service brake is determined by whether or not the operation of the power cutoff relay 7 is released. However, the criteria for determining whether to cancel the operation of the power cutoff relay 7 are not limited to the present embodiment. For example, the key switch is turned on again, or the selected position of the AT position switch 15 is switched to the parking position.
It can be replaced with another condition.

Further, in the above-described embodiment, the engine is stopped by cutting off the power supply to the engine drive electrical components, but the engine may be stopped by a method of cutting off the fuel supply.

[0025]

According to the engine control device for an AT-equipped vehicle of the present invention, in an AT-equipped vehicle stopped only by the parking brake while the engine is rotating while the engine is running, the load increases due to the operation of the air conditioner or the like. When the rotation speed increases and the driving torque output from the engine exceeds the braking torque of the parking brake, and the vehicle moves, the control unit stops the engine and prevents the vehicle from starting. Therefore, it is possible to reliably prevent an accidental accident caused by an erroneous start in a stopped AT-equipped vehicle with only the parking brake. Moreover, it has excellent versatility that can be commonly used for various types of vehicles, and can improve safety at low cost in AT-equipped vehicles. A configuration in which the control unit is configured to stop the engine by opening a contact of a normally closed power cutoff relay provided in a power supply path between an ignition-on contact of a key switch of the vehicle and an electric component for driving the engine. In such a case, the operation of stopping the power supply to the engine drive electrical component by the relay can be realized very instantly, so that the engine stop processing can be speeded up.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an engine control device for an AT-equipped vehicle according to the present invention.

FIG. 2 is a flowchart showing a control operation in a control unit in the engine control device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine control device 2 Ignition ON contact 5 Power supply line 7 Power cut-off relay 9 Control unit 10 Power supply line 12 Battery 14 Alternator 15 AT position switch 17 Service brake switch 18 Parking brake switch 19 Speed sensor for speedometer

Claims (2)

[Claims] An engine control device for a vehicle equipped with an automatic transmission (AT), wherein the vehicle moves when the engine is rotating, the AT position is other than parking or neutral, and the vehicle is stopped only by a parking brake. A having a control unit for stopping the engine when detecting
Engine control device for T-equipped vehicles. 2. The control unit according to claim 1, wherein the control unit stops the engine by opening a contact of a normally-closed power cut-off relay provided in a power supply path between an ignition-on contact of a key switch and an electric component for driving the engine. The engine control device for an AT-equipped vehicle according to claim 1, wherein: