JPH07125617A - Auxiliary device for starting on slope - Google Patents

Abstract

PURPOSE:To dispense with a surplus device by commonly using a control valve to keep the brake pressure with a control valve of an anti-lock brake system or an anti-slip regulation system, and connecting these control signals to each other by the OR logics. CONSTITUTION:A control valve 7 to keep the brake pressure even when a brake pedal 6 is released is commonly used with a control valve of an anti-slip regulation system (ASR), and the control signals from a first program control circuit 8 and a second program control circuit 9 for ASR are connected to an OR logics circuit 10. When a vehicle is braked on a slope, the first program control circuit 8 transmits the signal of prohibiting the auxiliary operation in starting on the slope to the OR logics circuit 10 by a clutch sensor 2 and a neutral switch 4. On the other hand, when the ASR is operated or released, the control signal is transmitted from the OR logics circuit 10 to the control valve 7. Other signals are transmitted from the second control circuit 9 to brake boosters 11a-11c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used by being installed in an automobile. The present invention relates to a driving assistance device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer-aided driving assistance device that assists a brake pressure release operation when a vehicle starts from a state of being stopped on a slope.

[0002] The present invention is applied to an automobile in which a driver operates a clutch and a transmission gear with a clutch pedal and a select lever. It does not apply to so-called automatic vehicles that are operated manually.

[0003]

2. Description of the Related Art When a vehicle stopped on a slope road is started, the driver temporarily applies a braking force to the vehicle to apply a braking force to the vehicle, selects a shift gear as a start gear, and slowly engages the clutch to accelerate. It is necessary to depress the pedal to increase the output of the engine and to perform a complicated operation of loosening the parking brake. Although such an operation is a basic item for driving an automobile, the operation of a truck, a bus, or the like is greatly different depending on the load, and the engine is apt to stall or reverse.

As a device for assisting such a driving operation, there is known a slope starting assist device disclosed in JP-A-60-11719 or JP-A-4-244462. In addition, such a device has been put into practical use and equipped in an automobile for sale.
It has come to be widely used under the names such as d).

In the conventional hill start assisting device, when the brake pressure exceeds a certain value and the vehicle speed becomes zero, that is, when the vehicle stops after passing a running state (the vehicle may have a gradient in the running direction). If detected, the driver brakes
The brake pressure is automatically maintained even when the foot is released from the pedal. In this state, when the driver selects the select lever to the starting position, engages the clutch, and depresses the accelerator pedal, the device automatically detects it, and automatically at the most appropriate timing. It is configured to release brake pressure. In a vehicle equipped with such a slope start assist device, the driver can perform a slope start operation without operating the parking brake.

Even if there is no gradient in the traveling direction of the vehicle, if the brake pressure is maintained when the vehicle is stopped from the traveling state, the brake pressure is automatically maintained even when the vehicle is stopped such as waiting for a signal. Sometimes it's convenient, and it's used for that.

[0007] The hill start assisting device that is practically used is
After the brake pressure is automatically maintained, the parking
When the brake is applied, the brake pressure is automatically released. That is, when the driving operation is completed and the vehicle is stopped, the temporary holding state of the brake pressure is released so that the temporary holding state of the brake pressure is not used in place of the parking brake. In addition, when the driver tries to leave the seat while the brake pressure is automatically maintained, a safety device such as issuing a large alarm is added.

[0008]

In such a slope start assist device, a brake pressure control valve is used as a device for automatically maintaining the brake pressure even when the driver releases his foot from the brake pedal. It This control valve introduces the pressure generated by the brake pedal to the brake booster (or brake cylinder) and temporarily holds the pressure introduced to the brake booster side according to the control signal, so that the control signal disappears. When this happens, this pressure is released. This control valve needs to be extremely reliable and is an expensive device. The price of this control valve accounts for a large part of the component price of the slope start assist device.

On the other hand, an anti-lock brake system (hereinafter referred to as "ABS") or an anti-slip regulation system (hereinafter referred to as "ASR") is known. ABS or ASR is a device for controlling a brake pressure of a vehicle to avoid a locked state or a skid of a wheel due to a brake. Since it is effective for safe driving, it is expected to be widely installed in many automobiles. is there. This ABS or ASR requires a control valve, which introduces the pressure of the brake pedal into the brake booster (or brake cylinder) and controls the pressure according to a control signal. Is. And this control valve also requires extremely high reliability and is an expensive device.

The present invention has been made against such a background, and an object thereof is to provide an economical hill start assisting device. The present invention, when a vehicle equipped with ABS and / or ASR is also equipped with a slope start assist device, the control valve of the slope start assist device and the ABS and / or A
The purpose is to share the control valve of SR with the economy.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a computer-controlled driving assistance device for assisting a brake pressure releasing operation when a vehicle starts from a state where it is parked on a slope. , A clutch sensor, a rotation sensor, and a neutral switch that indicates the neutral position of the speed change lever, a control valve that holds the brake pressure according to the control signal even when the brake pedal is released, and the output of each sensor. And a program control circuit for transmitting the control signal, the control valve is shared with a control valve for ABS or ASR, and the control signal of the control valve is The control signal of ABS or ASR is connected by OR logic.

The control signal sent from the control circuit and the control signal of ABS or ASR are both set to substantially equal voltage levels, and both logic "1" when indicating the state in which the control valve holds pressure. (With voltage), and logic "0" when instructing the state to release pressure
(No voltage) is desirable.

Further, the control circuit of the slope start assist device and A
The control circuit of BS or ASR can be mounted as one control circuit, and each sensor can be shared by the control circuit of the hill start assist device and the control circuit of ABS or ASR.

[0014]

[Function] The control valve of the slope starting assist device, which automatically maintains the brake pressure according to the control signal from the program control circuit even when the brake pedal is released, controls the brake pressure of the vehicle to lock the wheels by the brake. Alternatively, it is commonly used as a control valve for ABS or ASR that avoids skid, and the control signal from the program control circuit of the slope assist device and the control signal of ABS or ASR are ORed as a control input of this control valve. The control valve is operated by the control signal and either the ABS or the ASR control signal from the slope start assist device.

As described above, since the control valve for the hill start assisting device and the control valve for the ABS or ASR, which are expensive, are shared, the manufacturing cost can be reduced and the occupying area for installation can be reduced. Can be made smaller.

The slope start assist device operates while the vehicle is stopped, and the ABS or ASR does not operate at the same time because it operates during high-speed running or start.

[0017]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1 is a view showing the arrangement of the essential portions of the first embodiment of the present invention.

The first embodiment of the present invention shows an example in which a control valve for ASR is commonly used.
Sensor 1, clutch sensor 2, rotation sensor 3,
A control valve 7 that includes a neutral switch 4 that indicates the neutral position of a speed change lever and a gradient sensor 5, that holds a brake pressure according to a control signal even when the brake pedal 6 is released, and an output of each sensor as input. It is provided with a first program control circuit 8 for a hill start assisting device that sends out the control signal and a second program control circuit 9 for ASR. Further, as a feature of the present invention, the control valve 7 is AS
It is also used as a control valve for R, and control signals from the first program control circuit 8 and the second program control circuit 9 are connected to the control input of the control valve 7 by the OR logic circuit 10.

The control signal sent from the first program control circuit 8 for the slope starting assistance device and the control signal from the second program control circuit 9 for the ASR are both set to substantially equal voltage levels (for example, 5V), Control valve 7
Is a logical "1" (with voltage) when indicating a state of holding pressure, and a logical "0" (no voltage) when indicating a state of releasing pressure. The rotation sensor 3 among the above-mentioned sensors is shared by the first program control circuit 8 for the slope start assist device and the second program control circuit 9 for the ASR.

The first program control circuit 8 for the slope start assist device and the second program control circuit 9 for ASR can be implemented as one program control circuit.

Next, the operation of the embodiment of the present invention thus constructed will be described.

In the case of the hill start assisting operation, the first program control circuit 8 takes in the output from the brake pedal sensor 1 and judges whether or not the value of the preset depression amount is exceeded and the setting is made. If it exceeds the value, the output from the rotation sensor 3 is taken in and it is determined whether or not the vehicle speed is zero. When the vehicle speed is zero, the output from the gradient sensor 5 is fetched and it is determined whether or not the current gradient exceeds a preset value. If the value is not exceeded, the control signal is sent to the OR logic circuit 10 on the assumption that the brake pedal 6 is stepped on, the vehicle is stopped, and the vehicle is on a road that requires assistance for starting a slope. OR logic circuit 1
0 takes an OR logic and sends a control signal to the control valve 7 as shown by a broken line.

The control valve 7 operates according to this control signal, and the air from the air tank 12 is supplied to the wheel brake 1.
3 is supplied to execute the auxiliary movement for starting a slope.

As described above, when the vehicle is in the brake holding state on a slope, the first program control circuit 8 causes the clutch
When it is detected by the outputs from the sensor 2 and the neutral switch 4 that the clutch is depressed and the gear is set to the start state, a control signal for prohibiting the slope start assist operation is sent to the OR logic circuit 10. . O
The R logic circuit 10 takes the OR logic of this control signal and sends it to the control valve 7 to stop the slope starting assist operation.

On the other hand, the control signal is also sent to the OR logic circuit 10 when the ASR for controlling the brake pressure of the vehicle to avoid the locked state or skid of the vehicle by the brake is operated or released. And O
The R logic circuit 10 takes the OR logic of this control signal and sends it to the control valve 7. At this time, another control signal is sent from the second program control circuit 9 to the brake boosters 11a, 11b, 11c. The control valve 7 and the brake boosters 11a, 11b, 11c execute the operation of the ASR or release the operation according to these control signals.

The control signal sent from the first program control circuit 8 for the hill start assisting device and the control signal from the second program control circuit 9 for the ASR are set to substantially equal voltage levels (for example, 5V). When the control valve 7 instructs the state of holding the pressure, the logic "1" indicates "with voltage", and when the state of releasing the pressure indicates "0", the logic indicates "no voltage".

The hill start assisting operation is an operation performed when the vehicle is stopped by braking, and the ASR operation is an operation performed for avoiding a wheel lock state or skid while the vehicle is traveling at high speed. Therefore, these controls are not performed at the same time. Therefore, the control signal can be connected by the OR logic circuit 10 and either one can be sent to one control valve 7 to perform the control operation.

(Second Embodiment) FIG. 2 is a view showing the arrangement of the essential parts of a second embodiment of the present invention.

The second embodiment of the present invention shows an example in which a control valve for ABS is shared, and a brake pedal sensor 1, a clutch sensor 2, a rotation sensor 3 and a speed lever neutral are provided. Neutral switch 4 shown
And a gradient sensor 5, and control valves 7a, 7b, 7c that maintain the brake pressure according to the control signal even when the brake pedal 6 is released, and the control signal is sent by using the output of each sensor as input. It is provided with a first program control circuit 8 for a slope start assist device and a second program control circuit 9 for ABS, and further, the first program control circuit 8 and the second program control circuit 8 are provided for the control inputs of the control valves 7a, 7b, 7c. The control signal from the program control circuit 9 is connected by the OR logic circuit 10.

The control signal sent from the first program control circuit 8 for the slope start assist device and the control signal from the second program control circuit 9 for the ABS are substantially equal to each other in the same voltage level (as in the first embodiment). For example, when the control valves 7a, 7b, and 7c are both set to a voltage of 5 V) and the control valves 7a, 7b, and 7c support the pressure holding state, the logic is "1" (with voltage), and when the pressure releasing state is instructed, the logic "0" is set. (No voltage). Brake pedal among the above sensors
The sensor 1 and the rotation sensor 5 are shared by the first program control circuit 8 and the second program control circuit 9.

Also in the second embodiment, the first program control circuit 8 and the second program control circuit 9 can be implemented as one program control circuit.

In the second embodiment, in the case of the hill start assisting operation, the control valves 7a, 7b and 7c are operated by the control signal from the OR logic circuit 10 as in the first embodiment to implement the hill start assisting operation. To do. In addition, the stop of the hill start assisting operation is also performed as in the first embodiment.

AB for controlling the brake pressure of the vehicle to avoid the locked state or skid of the vehicle due to the brake
When S operates or is released, the control signal is sent to the OR logic circuit 10, and the OR logic circuit 10 takes the OR logic of this control signal to control valve 7a,
7b, 7c. The brake boosters 11a, 11b, 11c operate in accordance with this control signal and the ABS
The operation is executed or the operation is canceled.

[0035]

As described above, according to the present invention, since the control valve for ABS or ASR can be commonly used for the hill start assisting operation, it is not necessary to additionally install an expensive device and the manufacturing cost can be reduced. Can be reduced, and the occupied area required for installation can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second embodiment of the present invention.

[Explanation of symbols]

 1 Brake Pedal Sensor 2 Clutch Sensor 3 Rotation Sensor 4 Neutral Switch 5 Gradient Sensor 6 Brake Pedal 7, 7a, 7b, 7c Control Valve 8 First Program Control Circuit 9 Second Program Control Circuit 10 OR Logic Circuit 11a , 11b, 11c Brake booster 12 Air tank 13 Wheel brake

Claims (4)

[Claims] 1. A brake pedal sensor, a clutch sensor, a rotation sensor, and a neutral switch that indicates a neutral position of a speed change lever, the brake pressure being maintained according to a control signal even when the brake pedal is released. In the slope starting assist device including a control valve for controlling the output of each sensor and a program control circuit for transmitting the control signal by using the output of each sensor as an input, the control valve includes an antilock brake system (AB).
S) or an anti-slip regulation system (ASR) and a control valve for the control input of the control valve and the anti-lock braking system (ABS) or anti-slip regulation system (ASR). ASR) control signals are connected by OR logic. 2. A control signal sent from the control circuit and an anti-lock braking system (ABS) or an anti-slip regulation system (AS).
R) control signals are both set to substantially equal voltage levels, and both are logic "1" (with voltage) when the control valve indicates a state of holding pressure, and indicates a state of releasing pressure. 2. The hill start assist device according to claim 1, wherein the device is a logic "0" (no voltage) when the vehicle starts. 3. The control circuit of a slope start assist device and the control circuit of an antilock brake system (ABS) or antislip regulation system (ASR) are mounted as one control circuit. Hill start assist device. 4. The rotation sensor includes a control circuit for a slope start assist device and an antilock brake system (AB).
S) or an anti-slip regulation system (ASR) shared with the control circuit according to claim 1, wherein