JPH0899614A - Auxiliary device for starting vehicle at sloping road - Google Patents

Abstract

PURPOSE: To prevent the travel of a vehicle even when the vehicle begins to descend a sloping road due to the shortage of braking pressure by providing a means for sending an audible alarm when the rotation of a wheel is detected in a condition where a solenoid valve is keeping braking pressure. CONSTITUTION: When a brake pedal is applied, brake keeping action, by a program control circuit 10, inputs output from a vehicle speed sensor 2, when a vehicle speed is zero, unless the present output value of an acceleration sensor 6 exceeds a given value S, as a vehicle is in a stop condition, a control signal is sent to a solenoid valve 1 to actuate a brake valve 13 to perform auxiliary action for starting a vehicle at a sloping road. At that time, the program control circuit 10 sends an alarm signal to an alarm device 22 to acctuate an alarm lamp 24 as a wheel is turned to move the vehicle even under a braking condition when pulse signals from a circuit sensor provided in a vehicle speed sensor 2 are sent by a given frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a vehicle driving assistance device. TECHNICAL FIELD The present invention relates to an improvement in a slope start assist device that temporarily holds the braking pressure even when the brake pedal is released when a braking pressure of a predetermined value or more is applied and the vehicle speed reaches zero. INDUSTRIAL APPLICABILITY The present invention is applied to an automobile equipped with a clutch and a manual shift transmission, and is not applied to an automatic vehicle having no clutch pedal.

[0002]

2. Description of the Related Art A driving operation for starting an uphill road in which an automobile stopped in the middle of an uphill road is started in an uphill direction, in which a brake pedal is depressed and a clutch pedal is depressed to start a transmission (or a reverse gear). ) Is set and the clutch pedal is gently pulled in the shallower stepping direction, and when the clutch is in the half-clutch state, the brake pedal is released and the accelerator pedal is depressed. The slope start assist device is a driving assist device that automatically executes this. That is, when the vehicle decelerates and the vehicle speed reaches zero (or almost zero) and the clutch pedal exceeds the predetermined value, the hill start assist device releases the brake pedal. Is also controlled to automatically maintain the braking pressure. further,
When the clutch pedal on which the transmission has been set and stepped on is released to the set position, the holding state of the braking pressure is automatically released.

This device takes in a solenoid valve connected so as to maintain a braking pressure according to control even when the brake pedal is released, and takes in vehicle speed information and clutch pedal stroke information to electrically control this solenoid valve. And a program control circuit for executing the program. When equipped with this device,
Even if the driver releases the brake pedal while the side brakes are not applied, the vehicle is held in a stopped state, so that the above-described driving operation for starting a slope can be smoothly performed. Further, when driving on a road in a congested state, it is not necessary to continue to press the brake pedal for a long time or repeatedly operate the side brake, so that the driver's fatigue can be reduced. This device has become widely implemented in manual transmission trucks.

A technique for issuing an alarm when the vehicle speed is generated after holding the braking pressure in such a hill start assist device is disclosed in Japanese Patent Application Laid-Open No. 64-60457.

[0005]

The slope starting assist device is a device for holding the braking pressure even if the brake pedal is released while the vehicle is stopped. However, the vehicle is stopped while the pressure is held. Should be maintained. On the other hand, if the vehicle moves while the braking pressure is maintained,
It is a lack of braking pressure or other abnormal condition and the driver must take corrective action.

The present invention has been made against such a background, and provides a device for alerting the driver when a wheel rotates while the braking force is maintained by the slope start assist device. The purpose is to An object of the present invention is to equip a warning device so that a slope start assist device can be used properly.

[0007]

SUMMARY OF THE INVENTION According to the present invention, when the brake pedal is depressed and the vehicle speed reaches zero, the braking pressure is temporarily retained even if the brake pedal is released, and the wheel is maintained in this retained state. It is characterized in that an alarm is issued to notify the occurrence of an abnormal condition when the rotation exceeds a predetermined value.

That is, a solenoid valve connected so as to maintain the braking pressure according to the control even when the brake pedal is released, and a control circuit for controlling the solenoid valve by taking in vehicle speed information and stroke information of the clutch pedal. The control circuit comprises means for sending a control output for holding the braking pressure to the solenoid valve when the brake pedal is depressed and the vehicle speed becomes zero and the stroke of the clutch pedal is depressed deeper than a predetermined value. The slope start assisting device is characterized by further comprising means for sending an audible alarm when wheel rotation is detected while the solenoid valve holds braking pressure.

The vehicle speed information is information obtained by counting the pulses generated at every constant angle of the wheel at every constant time, and the rotation of the wheel can be detected when a predetermined number of the pulses are generated. desirable.

[0010]

When the vehicle decelerates by depressing the brake pedal and stops, the braking pressure is automatically maintained even if the driver releases his foot from the brake pedal. In this state, the wheel rotating at a slight angle is an unexpected situation such as insufficient braking pressure or failure of the hill start assist device, and the driver must take appropriate countermeasures. In the device of the present invention, an alarm is issued when the wheels rotate by a predetermined value or more.

In order to obtain speed information, the wheel is equipped with a vehicle speed sensor provided with a rotation sensor for generating a pulse at a constant angle. Therefore, after the braking pressure is maintained, this rotation sensor outputs a pulse a predetermined number of times. It should be configured so that an alarm will be issued if it occurs.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the main part of the embodiment of the present invention.

In the embodiment of the present invention, the solenoid valve 1 connected so as to maintain the braking pressure according to the control even when the brake pedal 11 is released, the vehicle speed sensor 2 for detecting the vehicle speed, and the stop for detecting the braking. A ramp switch 3, a clutch stroke sensor 4 that detects the stroke of the clutch pedal 12, a hydraulic sensor 5 that detects the hydraulic pressure value of the hydraulic circuit of the clutch, and a neutral switch that indicates that the vehicle speed lever is in the neutral position. 7 (or a gear-in switch 8 for detecting that the transmission is set to a start gear or a reverse gear), an acceleration sensor 6 for detecting the acceleration of the vehicle, a vehicle speed sensor 2, a stop lamp switch 3, a clutch stroke, Sensor 4, oil pressure sensor 5, neutral switch 7 (or gear-in switch 8) and A program control circuit 10 for controlling the solenoid valve 1 receives the output from the speed sensor 6, the operation panel 21 for performing an operation input to the program control circuit 10
And an alarm device 22 for issuing an alarm when the output of the acceleration sensor 6 is on a downhill exceeding a predetermined value while the brake pressure is maintained, and when a failure occurs. The alarm device 22 is provided with an alarm buzzer 23 that sounds an alarm and an alarm lamp 24 that lights up to generate an alarm.

Further, the program control circuit 10 is provided with a control output for causing the solenoid valve 1 to hold the braking pressure when the brake pedal is depressed and the vehicle speed becomes zero and the stroke of the clutch pedal 12 is depressed deeper than a predetermined value. As a feature of the present invention, there is provided a means for sending out, and a means for sending out an audible alarm when the rotation of the wheel is detected while the solenoid valve 1 holds the braking pressure. The vehicle speed information from the vehicle speed sensor 2 is information obtained by counting the pulses generated at each constant angle of the wheel at regular time intervals, and the rotation of the wheel is detected by the pulse generation.

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

First, a description will be given of the hill start assisting operation performed during normal traveling. FIG. 2 is a flow chart showing the flow of the brake holding operation in the embodiment of the present invention, and FIG. 3 is a flow chart showing the flow of the brake release operation in the embodiment of the present invention.

The brake holding operation by the program control circuit 10 is as shown in FIG.
However, the output from the stop lamp switch 3 is taken in and it is determined whether or not the brake pedal is depressed. If the brake pedal is not depressed, it means that the vehicle is not stopped due to braking, so the sending of the control signal to the solenoid valve 1 is prohibited and the assisting operation for starting the slope is stopped. When the brake pedal is depressed, the output from the vehicle speed sensor 2 is fetched to determine whether the vehicle speed is zero. If the vehicle speed is not zero, the vehicle is running, so the sending of the control signal to the solenoid valve 1 is prohibited and the auxiliary operation for starting the slope is stopped.

When the vehicle speed is zero, the output from the acceleration sensor 6 is taken in. When the current output value of the acceleration sensor 6 exceeds a predetermined value S, it is determined that the vehicle is not stopped and the solenoid valve 1 is detected. Disables the control signal transmission and stops the auxiliary operation. If it does not exceed the predetermined value S, it is determined that the vehicle is in a stopped state, and it is determined whether or not the stroke of the clutch exceeds the predetermined value. If it exceeds the predetermined value, the solenoid valve 1
To drive the solenoid valve 1 to operate the brake valve 13 to execute the hill start assisting operation. If it does not exceed the predetermined value, the control signal transmission to the solenoid valve 1 is prohibited and the execution of the auxiliary operation is stopped.

Next, the brake release operation performed during normal traveling will be described with reference to FIG.

When the vehicle is in a brake holding state on a slope, the clutch stroke sensor 4 and the neutral
The output from the switch 7 (or gear-in switch 8) is taken in and it is determined whether the clutch pedal 12 has been depressed to set the gear to the forward drive position (low or second) or the reverse position.

When the clutch pedal 12 is depressed and the gear is set to the starting state, it is judged from the output of the clutch stroke sensor 4 whether or not the stroke is equal to or less than a predetermined stroke. When the stroke is equal to or less than the predetermined stroke, it is assumed that the vehicle is started, and the sending of the control signal to the solenoid valve 1 is prohibited and the brake is released. If the gear is not set to the start state or the depression amount of the clutch pedal 12 is equal to or more than the predetermined stroke,
The control signal is continuously sent to the solenoid valve 1 to maintain the brake holding state.

The brake release position (value of the stroke of the clutch pedal 12) can be set arbitrarily by adapting to the driver's preference and a change due to wear of the clutch by an operation input from the operation panel 21. The value of the set stroke of the clutch pedal 12 is held until it is reset. If the depression stroke of the clutch pedal 12 exceeds the set reference value, the starting assistance operation is continued.

Now, the alarm generating operation when the rotation of the wheel is detected in the brake holding state according to the present invention will be described. FIG. 4 is a flow chart showing the flow of the alarm generation operation in the embodiment of the present invention.

When a control signal is sent from the program control circuit 10 to the solenoid valve 1 and a braking pressure is applied by the solenoid valve 1 to hold the brake, the program control circuit 10 is provided in the vehicle speed sensor 2. Check if there is a pulse signal from the circuit sensor. When the pulse signal is transmitted a predetermined number of times, it is determined that the wheels are rotating and the vehicle is moving even in the braking state, and the alarm device 22
Sends an alarm signal to. The alarm device 22 sounds the alarm buzzer 23 by this alarm signal and prompts the driver to take immediate action. At this time, the alarm lamp 24 may be turned on to visually give an alarm.

The information as to whether or not the wheel is rotating can be obtained by counting the number of pulses of the vehicle speed sensor 2.

[0026]

As described above, according to the present invention, when the wheel rotates while the braking pressure is maintained, it is immediately detected and an alarm is issued, and the driver is immediately required to take appropriate measures. Can be encouraged to take. As a result, when the braking pressure is insufficient and the vehicle is starting to go down a slope, an alarm is immediately issued, so that it is possible to prevent the vehicle from running in an abnormal state.

[Brief description of 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 flowchart showing a flow of a brake holding operation by a program control circuit in the embodiment of the present invention.

FIG. 3 is a flowchart showing a flow of a brake release operation by the program control circuit in the embodiment of the present invention.

FIG. 4 is a flowchart showing the flow of an alarm generation operation in the embodiment of the present invention.

[Explanation of symbols]

 1 solenoid valve 2 vehicle speed sensor 3 stop lamp switch 4 clutch stroke sensor 5 hydraulic pressure sensor 6 acceleration sensor 7 neutral switch 8 gear-in switch 10 program control circuit 11 brake pedal 12 clutch pedal 13 brake valve 21 operation panel 22 alarm device 23 Alarm buzzer 24 Alarm lamp

Claims (2)

[Claims] 1. A solenoid valve connected to hold a braking pressure according to control even when the brake pedal is released, and vehicle speed information, braking pressure information and stroke information of a clutch pedal are fetched to control the solenoid valve. And a control circuit, wherein the control circuit sends a control output for holding the braking pressure to the solenoid valve when the brake pedal is depressed and the vehicle speed becomes zero and the stroke of the clutch pedal is depressed deeper than a predetermined value. A hill-start assisting device comprising means for outputting an audible alarm when wheel rotation is detected while the solenoid valve holds braking pressure. 2. The vehicle speed information is information obtained by counting pulses generated at constant wheel angles at regular time intervals, and rotation of the wheel is detected when a predetermined number of pulses are generated. The hill start assist device according to claim 1.