JPH05254405A - Brake auxiliary system - Google Patents

Abstract

PURPOSE:To smoothly start a vehicle mounted with a manual transmission by changing the release timing of an auxiliary brake on a flat road and an inclined road. CONSTITUTION:A manual transmission-mounted vehicle is provided with an auxiliary brake holding the brake pressure, a brake sensor 2, an accelerator 3, a transmission sensor 5, a car speed sensor 6, an inclination sensor 7, a clutch switch 4, and a control means controlling the operation of the auxiliary brake based on the information from the sensors and switch. The control means operates the auxiliary brake only when it detects that the vehicle is in the complete stop state, and it releases the auxiliary brake in response to various states based on the detection result of the inclination sensor 7 in a brake auxiliary system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake assist system that detects a stopped state of a vehicle equipped with a manual transmission and a sloped state of a road surface, and controls braking retention and starting assistance of the vehicle corresponding to each state.

[0002]

2. Description of the Related Art Conventionally, for the purpose of smoothly starting a vehicle equipped with a manual mission on an uphill road, an auxiliary brake operates while the clutch pedal is depressed when the vehicle is stopped on the uphill road, It is known that the auxiliary brake is released as the foot is released from the clutch pedal, but this device has a drawback that it does not operate on a flat road. In order to prevent this drawback, there are some cases where the auxiliary brake operates when the foot is released from the accelerator pedal or when the clutch pedal is stepped on. There is a drawback that the auxiliary brake is released by an operation unrelated to the start, such as depressing the pedal to drive the vehicle.

Further, in order to prevent the above-mentioned drawbacks, some switches are provided on the change lever to prevent the brake from being released by an operation unrelated to traveling. However, in this device, the moment the clutch is engaged. Had a drawback that the vehicle would move backwards on the slope because the auxiliary brake was released. Therefore, there is a method in which the operation of the clutch switch is delayed, and an auxiliary brake is operated on the uphill road until the force to move the vehicle forward is generated, and the clutch switch is turned off.

[0004]

However, the above-mentioned device maintains the stopped state of the vehicle even on a flat road until a forward force enough to go up an uphill road is applied, and therefore the vehicle is stopped at the moment when the auxiliary brake is released. Suddenly starts and is very dangerous. As a result, the driver is nervously and physically burdened. Further, by the time the auxiliary brake is released, the vehicle causes a brake drag phenomenon,
If it is used frequently, the brake shoe may heat up and cause a fade phenomenon.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle when the vehicle is stopped on an uphill road.
Alternatively, in the case of a flat road, the auxiliary brake is operated / released according to each situation so that the vehicle and the driver are not burdened and the vehicle can be stopped / started safely.

[0006]

[Means for Solving the Problems] In a vehicle equipped with a manual transmission, an auxiliary brake that holds brake pressure, a brake sensor that detects whether or not the brake pedal is pressed, and an accelerator pedal are pressed. An accelerator sensor that detects whether or not there is a mission, a mission sensor that detects the position of the mission, a vehicle speed sensor that detects the speed of the vehicle, and an inclination sensor that detects whether the road is on an uphill road with a tilt angle of a predetermined angle or more. And a clutch switch that is turned on depending on the depression position of the clutch pedal, and a control unit that controls the operation of the auxiliary brake based on information from the sensors, the control unit including the brake sensor and the vehicle speed. If the vehicle detects that the vehicle has stopped, activate the auxiliary brake. Holding the rake pressure, while maintaining the stopped state of the vehicle, it said by tilt sensor detects that the inclination angle of the road surface is uphill of a predetermined angle or more, and the clutch switch enters, and the accelerator sensor,
A brake assist system is characterized in that the auxiliary brake is released after a lapse of a predetermined time (t) after detecting that the vehicle has entered the start state through the mission sensor.

[0007]

According to the present invention, when the brake pedal is depressed to stop the vehicle, the auxiliary brake is operated by the control means and the brake pressure is maintained. At this time, the stopped state of the vehicle is maintained even if the driver releases his foot from the brake pedal.

When the driver depresses the clutch pedal, puts the change lever into the starting gear and depresses the accelerator pedal, the mission sensor detects that the mission is in the starting gear (not in neutral), and When the sensor detects that the accelerator pedal is stepped on and the clutch switch is turned on, the control means releases the auxiliary brake.

At this time, the release timing of the auxiliary brake varies depending on the detection status of the tilt sensor. First, in the case of a flat road with an inclination angle of less than 3 ° or a downhill road with an inclination angle of 3 ° or more, when the clutch switch is turned on by the set point set immediately before the clutch is engaged, the control means immediately applies the auxiliary brake. To release.

Next, in the case of an uphill road where the inclination angle of the road surface is 3 ° or more, the control means releases the auxiliary brake t hours after the clutch switch is turned on.

The present invention is characterized in that the delay time t can be adjusted at the driver's seat, and the delay time t can be set according to the skill of each driver.

Further, two on-set points of the clutch switch are provided, and a flat road having an inclination angle of less than 3 ° or 3 °.
In the case of the downhill road as described above, the control means releases the auxiliary brake when the clutch switch is turned on at the point a set to the position immediately before the clutch is engaged.

On the other hand, in the case of an uphill road having an inclination angle of 3 ° or more, the control means releases the auxiliary brake when the clutch switch is turned on at a point b set at a position slightly after the clutch is engaged. You may do it. In this case, the position of the clutch switch b can be adjusted from the driver's seat by a servomotor or the like.

[0014]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram when the present apparatus is installed in a vehicle equipped with a manual transmission. The solenoid valve 1 (auxiliary brake) is a master cylinder (M / M).
C) and the wheel cylinder (W / C) are provided on the hydraulic path. The solenoid valve 1 has a structure that is operated / released (opened / closed) by a control unit 8 (control means) that functions as a solenoid valve control circuit. That is, when the solenoid valve 1 is closed, the brake fluid pressure of W / C is contained and the brake is applied, and the stopped state of the vehicle is maintained.

The brake pedal (not shown) is provided with a brake sensor 2 which is interlocked with the brake pedal as means for detecting whether or not the driver is stepping on the brake pedal, and notifies the control section of the detection status.

The vehicle speed sensor 6 for detecting the speed of the vehicle has a speed calculating device, and detects the speed from the number of rotations of the drive shaft per unit time.
To notify.

The accelerator pedal is provided with an accelerator sensor 3 as a means for detecting the depression state of the accelerator pedal of the driver, and notifies the control unit 8 of the presence / absence of depression of the accelerator pedal.

The mission sensor 5 detects whether or not the mission is in the neutral position by a neutral switch which is interlocked with the gear knob, and notifies the control unit 8 of it.

The clutch switch 4 is composed of a clutch switch interlocked with the clutch pedal. When the driver depresses the clutch pedal and then gradually releases the clutch pedal, a point 10 (FIG. 6) immediately before the clutch is engaged. ) To the switch. Therefore, the clutch switch is turned on immediately before the clutch is engaged, and the control unit 8 is notified of the signal.

The inclination sensor 7 detects whether or not the road surface is on an uphill road having an inclination angle of 3 ° or more and notifies the control unit 8 of it.

The control unit 8 is composed of, for example, a microcomputer having a CPU and a memory, and upon receiving a signal from each detecting means, controls the opening / closing of the solenoid valve 1 based on the program provided in the ROM memory.

Paths for activating and releasing the brake assist system by each sensor and control means are shown in FIGS. 1 and 2-4.
Will be explained.

First, referring to FIG. 2, the vehicle speed of the driver is 0 km /
When the vehicle is stopped by depressing the brake pedal until h, only when the brake sensor 2 detects that the brake pedal is depressed and the vehicle speed sensor 6 detects that the vehicle speed becomes 0 km / h, respectively. The control unit 8 is the solenoid valve 1
Is closed to maintain the brake fluid pressure in the wheel cylinder.
At this time, even if the driver releases his / her foot from the brake pedal, the brake fluid pressure is maintained and the vehicle remains stopped.

FIG. 3 shows the process of releasing the auxiliary brake when the tilt sensor 7 detects that the vehicle stop position is a flat road with a tilt angle of less than 3 ° or a downhill road with a tilt angle of 3 ° or more. , Step on the clutch pedal and set the gear to 1
When the accelerator pedal is depressed at high speed, the mission sensor 5 detects that the mission is in the first gear (other than neutral), the accelerator sensor 3 detects that the accelerator pedal is depressed, and the clutch switch 4 Only when the control unit 8 detects that the switch has been turned on, the control unit 8 opens the solenoid valve 1 immediately after the detection, lowers the hydraulic pressure in the wheel cylinder, and releases the auxiliary brake.

FIG. 4 shows the process of releasing the auxiliary brake when the tilt sensor 7 detects that the vehicle stop position is an uphill road with a tilt angle of 3 ° or more, and the mission sensor 5 detects that the mission is in the first speed. However, only when the accelerator sensor 3 detects that the accelerator pedal is stepped on and the control unit 8 detects that the clutch switch 4 is turned on, the electromagnetic wave is detected after t time has elapsed. The valve 1 is opened, the hydraulic pressure in the wheel cylinder is reduced, and the auxiliary brake is released.

The delay time t can be freely changed by the driver by the adjusting device provided in the driver's seat.

[0028]

Second Embodiment In the device of the first embodiment, a clutch switch 4b is provided at point 11 in FIG. 6, and the position of the clutch switch 4b can be changed from the driver's seat by a servomotor. Along with this, a brake assist system in which the release program of the control unit 8 opens the solenoid valve 1 at the same time as receiving a signal from the clutch switch 4b in the case of a slope will be described with reference to FIG.

Here, the operation path of the auxiliary brake is the same as that of the first embodiment, and therefore omitted. When the tilt sensor 7 detects that the road is flat, the mission sensor 5 detects that the mission is other than neutral, the accelerator sensor 3 detects that the accelerator pedal is depressed, and the clutch switch 4 operates. Only when it enters, the control unit 8 immediately opens the solenoid valve 1 and releases the auxiliary brake.

When the inclination sensor 7 detects an uphill road of 3 ° or more, the mission sensor 5 detects that the mission is other than neutral, and the accelerator sensor 3
Detects that the accelerator pedal is depressed and the clutch switch 4b is turned on, the controller 8 immediately opens the solenoid valve 1 to release the auxiliary brake.

Therefore, in the case of a flat road, the auxiliary brake is released just before the clutch is engaged, so that the vehicle can start running immediately after the release and the drag phenomenon of the brake is prevented. In addition, on an uphill road, the auxiliary brake is released after the clutch starts to be engaged, that is, the auxiliary brake is released after the vehicle has a sufficient forward force to go up the slope, so that the vehicle does not go back. You can start. Further, in the case of a downhill road, the same control as that on a flat road is performed, so that a smooth start can be performed without burdening the clutch and the brake.

[0032]

According to the present invention, the drag phenomenon of the brake and the fade phenomenon due to the brake drag phenomenon can be prevented on a flat road. Further, on an uphill road, it is possible to prevent the driver from retreating at the moment when the driver shifts his right foot from the brake pedal to the accelerator pedal at the time of starting, retreating due to engine stop of a beginner, and the like, which may cause a collision with a following vehicle.

Further, since the delay time t can be adjusted in the driver's seat, it is possible to easily correct the variation of the clutch connection position due to the deterioration of the clutch plate and the individual difference in the operation technique by the driver.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a logic diagram showing an operation path according to the first embodiment of the present invention.

FIG. 3 is a logic showing a release route of the first embodiment on a flat road.

FIG. 4 is a logic diagram showing a release path according to the first embodiment of the present invention on a slope.

FIG. 5 is a logic diagram showing a schematic route of actuation / release according to the second embodiment of the present invention.

FIG. 6 is a sectional view of a clutch pedal showing a mounting position of a clutch switch according to the present invention.

[Explanation of symbols]

 1 ... Solenoid valve 2 ... Brake sensor 3 ... Accelerator sensor 4 ... Clutch switch 5 ... Mission sensor 6 ... Vehicle speed sensor 7 ... Inclination angle sensor 8 ... Controller 9 ... Clutch pedal 10 ... Point 11 ...

Claims (1)

[Claims] 1. In a vehicle equipped with a manual transmission, an auxiliary brake for holding a brake pressure, a brake sensor for detecting whether or not a brake pedal is depressed, and a detection for whether or not an accelerator pedal is depressed. Accelerator sensor, a mission sensor that detects the position of the mission, a vehicle speed sensor that detects the speed of the vehicle, a tilt sensor that detects whether the road is on an uphill road with a tilt angle of a predetermined angle or more, and a clutch pedal A clutch switch that is turned on depending on the depression position of the vehicle, and a control unit that controls the operation of the auxiliary brake based on information from each of the sensors, and the control unit controls the vehicle through the brake sensor and the vehicle speed sensor. When the stop is detected, the auxiliary brake is activated to apply the brake pressure. Hold, while maintaining the stopped state of the vehicle, the inclination sensor detects that the inclination angle of the road surface is an uphill road of a predetermined angle or more, and the clutch switch is turned on, through the accelerator sensor and the mission sensor, A brake assist system, wherein the auxiliary brake is released after a lapse of a predetermined time (t) after detecting that the vehicle has started.