JPH0840225A - On-slope start assisting device - Google Patents

Abstract

PURPOSE:To facilitate the proper set of a release point by automatically changing the set release point in the less stepping portion direction at a clutch, when the output of a car speed sensor displays the temporary retreat of the vehicle after the release of a service brake. CONSTITUTION:A program controller 10 confirms the existence of the trouble of a device, if the detection value of a car speed sensor 1 is zero, and a parking brake switch 4 is in a turned-OFF state. Accordingly, in case of a trouble state, an alarm 14 is operated, while if anomaly does not occur, the detection value supplied from a clutch stroke sensor 2 is taken in, in the turned-ON state of a gear-in switch 5. If a clutch is connected through a release point from the once-connected state, the detection value supplied from a car speed sensor 1 is taken in. When the detection value of the car speed sensor 1 exceeds a prescribed value, it is judged that the vehicle retreats temporarily, and this fact is displayed on an input unit 13, and the release point is automatically changed in the less ! stepping portion direction of the clutch.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is used in automobiles. TECHNICAL FIELD The present invention relates to an improvement in a device for maintaining a braking state. The present invention, when the vehicle starts from a state where the vehicle is stopped on a slope,
The present invention relates to an improvement in a device that automatically holds a brake even when a driver releases his / her foot from the brake pedal, and automatically releases the brake when a clutch pedal exceeds a set release point.

[0002]

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 matter in the driving operation of an automobile, in a truck, a bus or the like, the operation greatly varies depending on the load, and the engine stalls or the vehicle retreats easily.

As a device for assisting such a driving operation, there is known a slope start assisting device disclosed in JP-A-60-11719 or JP-A-4-244462.

In the conventional hill start assist device, the driver brakes when the brake pressure exceeds a certain value and the vehicle speed becomes zero, that is, when the vehicle stops after traveling.
The brake pressure is automatically maintained even when the foot is released from the pedal. In this state, the driver shifts the shift lever to the start gear (in the specific example, low gear, second gear
Gear) and the clutch is engaged and the accelerator pedal is depressed, the device automatically detects it and is configured to automatically release its brake pressure at the most appropriate time. ing. 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 braking pressure is maintained when the vehicle is stopped from the traveling state, the braking 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.

[0006] The hill start assisting device that is practically used is
After the brake pressure is automatically held, the brake pressure is released when the clutch is stepped deeply and then passes the set release point, but the release point setting must be changed by the driver's operation. You can do it. That is, the optimum position of this release point changes depending on the worn state of the clutch, may change according to the driver's preference, and may also change depending on the weight of the load.

In a specific example, the driver's seat is provided with an operation display panel of a slope start assisting device, and while operating the clutch, the display of the operation display panel is viewed and the operation buttons provided on the operation display panel are operated. By doing so, the release point can be changed little by little.

[0008]

SUMMARY OF THE INVENTION In such a device,
Not all drivers set the release point properly, and the operation is complicated. In order to set the release point accurately, it is necessary to stop the vehicle on an appropriate slope temporarily, and such operation to change the release point setting during operation with the actual load loaded I can't find a suitable place to do it. Therefore, if it is noticed that the position of the release point is different, the operation of the slope start assist device itself is stopped and the vehicle is driven. Further, even if the release point is changed, an operation such as appropriately changing only one step is performed, and in reality, there is a case where the direction for changing only one step is wrong.

The present invention has been made against such a background, and when the set release point is not appropriate, in particular, the set release point is set deep in the clutch step margin. At times, it is an object to provide a device capable of automatically detecting it and changing it to an appropriate position. It is an object of the present invention to provide a slope starting assistance device in which a set release point is operated at a reasonable position. It is an object of the present invention to provide a slope start assist device that does not bother setting a release point.

[0010]

SUMMARY OF THE INVENTION The present invention automatically holds the brake when the driver releases his foot from the brake pedal,
In the operation to automatically release the brake when the clutch pedal exceeds the set release point, when the set release point is not appropriate, it can be detected and changed automatically. , The output of the vehicle speed sensor is practically zero, the parking brake is released, the transmission is in the start gear, and the clutch is disengaged and then connected beyond the set release point. If the output of the vehicle speed sensor temporarily indicates the retreat of the vehicle after the release of the service brake, the slope release assist device provided with the control means for releasing the service brake under the condition that the set release point is set. It is characterized in that it is provided with a means for automatically changing the clutch to a shallower step of the clutch.

When the output of the vehicle speed sensor does not include a positive / negative sign, the output of the vehicle speed sensor temporarily exceeds the first predetermined value, then becomes a zero value, and then temporarily exceeds the second predetermined value. It is desirable that the vehicle be moved backward.

[0012]

[Function] When the output of the vehicle speed sensor is substantially zero, the parking brake switch indicates that the parking brake is released, the gear-in switch indicates that the transmission is in the starting gear, and the clutch stroke sensor indicates that the clutch is once After the service brake switch indicates that the service brake has been released, provided that it has been connected beyond the set release point after being disconnected, that is, provided that a series of hill start assist operations have been performed. , If the output of the vehicle speed sensor temporarily indicates the retreat of the vehicle, it is assumed that the service / brake release position corresponding to the clutch step allowance is not appropriate, and the set release point is set at a shallow clutch step allowance. Change direction automatically.

When the output of the vehicle speed sensor does not include a positive / negative sign, the output of the vehicle speed sensor temporarily exceeds the first predetermined value, then once becomes zero, and further exceeds the second predetermined value. Sometimes it is assumed that the vehicle has retreated temporarily.

As a result, even if the set release point is in an inappropriate position due to changes in the amount of wear of the clutch plate or the weight of the load, the release point can be automatically changed to the most rational position. it can. Further, it is possible to perform a safe hill start operation that does not bother the setting operation for changing the release point.

In the present invention, the release point set as described above is automatically changed in the direction of the shallower step of the clutch, but when this is repeatedly executed for some reason, the release point becomes dependent. It is possible that you will go too far in the shallow direction. Therefore, so that the set release point is automatically changed to the deeper step of the clutch, after the service brake is held, the clutch is once stepped on and then the brake of the slope start assist device is released. If the engine stop is detected before and the set release point is automatically changed to the deeper step of the clutch, the release point goes too far in the shallower step of the clutch. Is prevented.

[0016]

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

In the embodiment of the present invention, the vehicle speed sensor 1 for detecting the vehicle speed, the clutch stroke sensor 2 for detecting the stroke of the clutch, the service brake switch 3 for detecting the braking state by the service brake, and the braking by the parking brake. A parking brake switch 4 for detecting a state, a gear-in switch 5 for detecting a state in which the transmission is applied to a start gear, a gradient sensor 6 for detecting a gradient of a vehicle, and a control even if a brake pedal 11 is released. A solenoid valve 9 that adjusts the brake valve 12 in accordance with the signal to maintain the brake pressure, and when the output of the gradient sensor 6 exceeds a predetermined value while the brake pressure is maintained, and when a failure occurs. Incorporates outputs from the above-mentioned sensors and switches and an alarm device 14 that issues an alarm to It comprises a program control circuit 10 for controlling the solenoid valves 9, and an input unit 13 for performing an operation input to the program control circuit 10. The alarm device 14 is provided with an alarm buzzer 14a for generating an alarm by sound and an alarm lamp 14b for emitting an alarm by lighting.

Further, in the program control circuit 10, after the output of the vehicle speed sensor 1 is substantially zero, the parking brake is released, the transmission is in the starting gear, and the clutch is once disengaged. The control means for releasing the service brake on condition that the vehicle is connected beyond the set release point, and the setting when the output of the vehicle speed sensor 1 temporarily indicates the backward movement of the vehicle after the release of the service brake is set. And a means for automatically changing the release point in the shallow direction of the step margin of the clutch. When the output of the vehicle speed sensor 1 does not include a positive / negative sign, the output of the vehicle speed sensor 1 temporarily exceeds the first predetermined value and then becomes a zero value and then temporarily exceeds the second predetermined value. Suppose the vehicle moves backward.

Next, the operation of the embodiment of the present invention thus constructed will be described. FIG. 2 is a flow chart showing the flow of the hill start assisting operation in the embodiment of the present invention.

The program control circuit 10 takes in the detection output of the vehicle speed sensor 1 and, if the vehicle speed is substantially zero, checks whether or not the parking brake switch 4 is in the off state. Confirm that the brake is released and that there is no malfunction in the device. If there is a failure condition, an alarm signal is sent to the alarm device 14, an alarm sound is generated from the alarm buzzer 14a, and the alarm lamp 14b is turned on to notify that there is a failure condition.

If there is no abnormality, it is confirmed whether or not the gear-in switch 5 is in the ON state. If the gear-in switch 5 is in the ON state, the transmission is in the starting gear (including the reverse gear). -Acquire the detection output from the sensor 2 and check if the clutch is once disengaged. Next, it is confirmed whether or not the clutch is connected beyond the release point from the state where the clutch is once released, and if it is connected beyond the release point, the detection output from the vehicle speed sensor 1 is fetched.

When the positive / negative sign is not included in the detection output of the vehicle speed sensor 1, as shown by the solid line in FIG. 3, whether the output of the vehicle speed sensor 1 temporarily exceeds the first predetermined value V ₁ (backward shift). was either) verify to confirm whether exceeds a predetermined value V ₂ further second will then once zero value if it exceeds. If it exceeds, it is considered that the vehicle has temporarily moved backward, and the display is displayed on the input unit 13, and the release point is automatically changed to the shallower step of the clutch.

When the output of the vehicle speed sensor 1 includes positive and negative signs, it indicates that the vehicle has temporarily moved backward when the vehicle speed becomes negative, as indicated by the broken line in FIG.

As described above, if the set release point is automatically changed to the shallower step of the clutch, this may be repeated for some reason, and the release point may gradually overshoot in the shallower step. Can be considered.
In order to prevent this, it is appropriate to provide a means for automatically changing the set release point in the deeper step direction of the clutch. One of the countermeasures is to detect that an engine stall (stop of the internal combustion engine) occurred after the clutch was stepped on after the service brake was held and before the brake of the slope start assist device was released. In this case, it is appropriate to automatically change the set release point in the deeper step of the clutch.

As a result, even if the preset position of the release point of the clutch becomes improper due to wear of the clutch plate or change in the weight of the load, it is automatically detected and changed to the most suitable position. However, the vehicle can be operated at the position of the reasonable cancellation point.

[0026]

As described above, according to the present invention, when the set release point of the clutch is not appropriate such that it is located at a shallow step, it is automatically detected and an appropriate position is set. Can be changed to In other words, when the preset release point becomes an inappropriate position due to changes in the amount of wear of the clutch plate or the weight of the load, it is automatically changed and set. It operates while being set to the position, and there is no hassle of changing the setting of the release point by operation.

[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 slope starting assistance operation in the embodiment of the present invention.

FIG. 3 is a diagram for explaining rearward shift detection in the embodiment of the present invention.

[Explanation of symbols]

 1 vehicle speed sensor 2 clutch stroke sensor 3 service brake switch 4 parking brake switch 5 gear-in switch 6 gradient sensor 9 solenoid valve 10 program control circuit 11 brake pedal 12 brake valve 13 input unit 14 alarm device 14a alarm buzzer 14b Alarm lamp

Claims (2)

[Claims] 1. The output of the vehicle speed sensor is substantially zero,
Equipped with control means for releasing the service brake on condition that the parking brake is released, the transmission is in the starting gear, and the clutch is disengaged and then connected beyond the set release point. If the output of the vehicle speed sensor temporarily indicates that the vehicle is retreating after the service brake is released, the set release point is automatically changed to the direction of shallower stepping of the clutch in the slope start assist device. A hill start assisting device, which is provided with a means for performing. 2. When the output of the vehicle speed sensor does not include a positive / negative sign, the output of the vehicle speed sensor temporarily exceeds a first predetermined value and then becomes a zero value and then exceeds a second predetermined value. The hill start assist device according to claim 1, wherein the vehicle sometimes retreats temporarily.