JPS6022537A - Constant-speed traveling apparatus for car - Google Patents

Abstract

PURPOSE:To prevent the danger such as reckless driving of a car by reducing the revolution of an engine by controlling the amount of fuel fed into the engine when a constant-speed traveling apparatus is broken. CONSTITUTION:In order to prevent the generation of the dangerous state such as reckless driving when a throttle valve 21 is not closed even after a release signal is received from a clutch switch 14 or a brake switch 15, and this state is detected by a throttle sensor 18, a control unit 10 judges the generation of a trouble in an actuator 9. Then, a signal is transmitted from the control unit 10 into a computer unit 17 for controlling the fuel injection system of an engine. Then, the amount of injection of an injector 19 for feeding fuel into the engine is reduced or cut by the unit 17, and thus the number of revolution of the engine is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant speed running device for an automobile, and more particularly to a system for preventing the danger of a vehicle running out of control when the constant speed running device fails.

Conventionally, there has been a device of this type as shown in FIG. That is, the carburetor body (1) is provided with a throttle valve (2) that controls the engine output, and this valve (2) is further connected via a throttle cable (3) to control the normal running and constant speed running. The throttle valve (2) is connected to a connecting part (4) such that the throttle valve (2) operates when driven from either side. Therefore, the accelerator pedal (6) that operates the throttle cable (5) for normal driving.
) can be operated with the foot (7) to arbitrarily accelerate or decelerate, and the constant speed running throttle cable (8) is actuated by the actuator (9) to run at a constant speed. You can also do it. Actuator (
9) is controlled by the control unit (II) and maintains and controls constant speed running by pulling and returning the throttle cable (8).

Various signals are supplied to this control unit (11) from each element.For example, constant speed running setting switch 0
At υ, there is a signal that sets constant speed running, a set signal that increases the set value of constant speed running, and a deceleration switch (12+).
Now, with the deceleration signal and resume (memory) switch 031 that lowers the set value of the constant speed running speed, when constant speed running is no longer required and is once canceled, it remembers the previous set signal and returns to that value. The resume (memory) signal of the clutch switch ([4)] is a clutch signal that is generated by depressing the clutch when shifting and changing the gear position when driving at the same speed ratio while driving at a constant speed, and the clutch switch ([4)] The switch Q generates a brake signal generated by depressing the brake pedal when immediately canceling constant speed driving, and the vehicle speed sensor Q6) generates a vehicle speed signal that serves as a reference signal for setting and controlling constant speed driving.

Now, when an automobile is run at a constant speed, there is generally a lower limit speed and an upper limit speed that can be set for constant speed running. First, accelerate the vehicle using the accelerator pedal (6),
A vehicle speed sensor (IG) detects that a predetermined vehicle speed has been reached. After that, when the driver presses the setting switch (II), the signal is sent to the control unit)
The control unit 7) (IG sends an acceleration, deceleration, or constant hold signal to the actuator (9). At the same time as the setting switch aυ is pressed, the clutch mechanism inside the actuator (9) operates. death,
When the actuator is engaged, the throttle valve (2) operates. At this point, even if the driver takes his foot off the normally used accelerator pedal (6), the vehicle will continue to run at a constant speed.

In this way, the vehicle will travel at a constant speed, but if you want to increase the set speed, keep pressing the setting switch 0υ and the control unit) (In) will move the actuator (9).
) is sent to increase the set vehicle speed.

Also, when you want to decrease the set vehicle speed, if you keep pressing the deceleration switch (12+), the control unit OC will send a signal to decelerate the vehicle while you keep pressing it, and the actuator (9) will loosen the throttle cable (8). .

Note that once the constant speed driving is canceled, the resume switch U is used when it is desired to return to the vehicle speed set before wF removal and oil removal. When this switch θJ is pressed, the memory function of the control unit OI is activated.

In addition, when the constant speed traveling device is in operation, if you want to release this device and drive normally, the clutch switch (1
4) Or operate the brake switch Q51. When approaching a steep hill, the clutch pedal is pressed to change the gear ratio of the transmission that was used while driving at a constant speed, in order to prevent the engine speed from increasing abnormally due to the engine being unloaded. , the clutch switch (14) built into the clutch pedal is activated and a signal is sent to the control unit 1, which immediately causes the actuator (9) to operate the clutch mechanism or maintain constant speed t! Am is released and the throttle cable (8) is loosened. When you press the brake pedal when you want to stop the vehicle, the brake switch (1!9) is activated and a signal is sent to the control unit 011, and in the same way as the clutch switch (14), this signal cancels constant speed driving. Therefore, in either case, constant speed running is canceled and the vehicle can now run normally by operating the throttle cable (5).

The conventional constant speed traveling device has been explained above, but it is clear from its configuration that even if an appropriate electrical signal is sent from the control unit to the actuator each time, an abnormality may occur in the mechanical system. If there are parts that do not operate properly, even if the electrical system is operating normally, it will not be possible to control the throttle opening normally, and the throttle opening will not correspond to the electrical signal, resulting in a constant throttle opening. You will no longer be able to cancel fast running. This is especially a big problem when you want to reduce the engine speed to escape from a dangerous situation.

The present invention has been made in view of these circumstances.
This device has a function that protects the device so that even if the electrical system is operating normally but there is a part that does not work due to an abnormality in the mechanical system, the original constant speed driving control can be canceled. Even if the throttle valve is open, t'! ! The object of the present invention is to provide a device that can forcibly reduce the engine speed even when the engine speed is low.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Note that the same elements are given the same reference numerals.

FIG. 2 shows an embodiment of the present invention (17+ is a computer unit in a system for injecting fuel).

H is a throttle sensor that detects the opening degree of the throttle valve (2), and (11 is an injector that injects fuel).

Now, in the device shown in Fig. 2, when the clutch pedal or brake pedal is depressed in an attempt to cancel constant speed driving control, an electric signal is normally sent from the clutch switch (14) or brake switch (1!lil) to the control unit 0. Even if the clutch mechanism inside the actuator (9) does not operate properly, mechanical parts other than the clutch mechanism, such as the link mechanism that pulls the throttle cable (8) or the gear inside the actuator (9), may If dirt gets caught in the parts or sliding parts, the mechanical system will not operate properly and the throttle valve (2) will remain open), resulting in no redundancy in the system of this device. I end up. As a result, even though the constant speed cruise control release signal is issued, the throttle cable does not return to its original position, so the engine speed does not decrease, causing the vehicle to run out of control.

In order to avoid such a dangerous situation, the control unit a0 controls the clutch switch αa or the brake switch 0! Even after receiving the release signal from '9, the throttle valve (2) does not close, and this condition is detected by the throttle sensor (
If lFj is detected, it is determined that some abnormality has occurred inside the actuator (9), and a signal is sent from the control unit (1 (1) to the computer unit 07 that controls the engine's fuel injection system). ,
The injector (1) that supplies fuel into the engine by the unit αη reduces or cants the injection amount and lowers the engine speed.

Note that even if the engine does not have a fuel injection system, part or all of the red passageway that supplies the fuel may be closed to reduce the rotation of the engine.

Furthermore, if there is a high possibility that completely stopping the engine will make driving dangerous, the same effect can be obtained by controlling the fuel supply so that the engine speed is close to the idling state.

Furthermore, in the case of a fuel injection system, the engine speed may be reduced by controlling the fuel pressure of the fuel supply.

In the above embodiment, an abnormality was detected using the throttle sensor (1cm), but the throttle valve (
The abnormality may be detected based on the engine rotation speed, etc., instead of the opening degree as in 2).

As described above, according to the present invention, even if some kind of mechanical failure occurs in the constant speed traveling device, the operation of the device can be reliably canceled, thereby preventing an extremely dangerous situation such as a runaway vehicle from occurring. It becomes possible to prevent this.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a conventional constant speed traveling device, and FIG. 2 is a schematic diagram showing a constant speed traveling device according to an embodiment of the present invention. (2)---Throttle pal 7'', (9)...Ac-1-yu, x-ta, (101'')・Fist control unit. (+4)...Clutch switch, (1 Brake switch, (17) Computer unit, α5 throttle sensor, (11) Injector. Agent Masuo Oiwa

Claims (1)

[Claims] In a constant speed driving device that detects the traveling speed of an automobile and adjusts a throttle valve using a control unit to maintain and control constant speed driving, there is provided a throttle sensor that detects the opening degree of the throttle valve. . 1. A constant speed driving device for an automobile, comprising a computer unit that controls the amount of fuel supplied to the engine based on a signal from a sensor, and controls the amount of fuel supplied to the engine to reduce the rotation of the engine.