JPH04215549A - Automatic operation/release system for parking brake - Google Patents

Abstract

PURPOSE:To permit the operation/release of a parking brake surely with high precision by automatically carrying out the operation/release of the parking brake and discriminating the start on a leveled ground/start an a slope, besides the stop/start of a vehicle. CONSTITUTION:An automatic parking brake control mechanism which performs operation/release of a parking brake by utilizing the fluid pressure which can be controlled on the basis of a prescribed control signal and other physical acting force is provided, and at least one active signal for detecting the operation state for an accelerator, or brake and other steering operation and at least one reactive detection signal for detecting the operation state on a reactive side which is arranged in a power passage ranging from an engine to a wheel through a power transmission part and corresponds to the active signal are combined, and the control signal is generated with high precision by adding both signals, preferably adding a vehicle attitude control signal.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically operating/releasing a parking brake called a handbrake or handbrake.

0002

[Prior Art] In order to start on a slope in a conventional manual car, it is necessary to operate the handbrake while holding the steering wheel with one hand, in addition to operating the clutch and accelerator when driving on flat ground. It was difficult to start smoothly on a slope, often causing engine stalling and other problems.

[0003] In addition, in automatic cars, the brake shoes may be damaged if the parking brake is accidentally driven in a partially released state without completely releasing it, and in recent accidents, mothers have been unable to pull the parking brake. Accidents have also been seen in which children who were in the office mistakenly operate the selector lever and start the vehicle because they were not at work, and the child forgets to operate the parking brake even though it is set for the desired purpose. Always works reliably/
Releasing the lock is extremely important from both driving and safety points of view.

0004

SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, the present invention automates the activation/release of the parking brake according to a desired purpose, and is capable of automating the activation/release of the parking brake not only when the vehicle is stopped/started, but also when the vehicle is started. It is an object of the present invention to provide a control system that can always reliably and accurately operate/release the parking brake by distinguishing between starting on a flat ground and starting on a slope.

[0005]

[Means for Solving the Problems] The present invention includes an automatic parking brake control mechanism that operates/releases the parking brake using controllable fluid pressure or other physical force based on a predetermined control signal. The second feature is that at least one active signal is obtained for detecting the operating state of the accelerator or foot brake or, if necessary, the clutch or other maneuvering operation, and the third feature is that The feature is that it detects the operating state of the passive side that corresponds to the active signal, which is placed in the power path from the engine to the wheels via the power transmission part.For example, it detects the rotational state of the wheels and the engine and power transmission part. The fourth feature of the present invention is that the control signal is generated based on both of the signals.

[0006]

[Operation] According to this technical means, as will be explained in detail in the embodiments below, the active signal for detecting the operating state of the maneuvering operation and the passive signal on the power path side corresponding to the active signal are grasped and both are detected. By activating/releasing the parking brake when they are consistent, it is possible to accurately and reliably control the parking brake when the vehicle is stopped/started.

In this case, as described in claim 2, by controlling the vehicle attitude detection signal in combination with the above-mentioned two signals, it is possible to distinguish between starting on a flat ground and starting on a slope. Objectives can be achieved smoothly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, and relative positions of the components described in this example are not intended to limit the scope of this invention, but are merely illustrative examples. Not too much.

FIG. 1 is a schematic diagram of a vehicle in which various parts used in the present invention are laid out. 1 is a center brake provided at the rear of the transmission, which can be activated/released by the expansion/contraction movement of a power cylinder 2 controlled by hydraulic pressure. It is composed of In the hydraulic path 9 is a solenoid valve 1 which is switched and operated based on a control signal from the computer 3.
0 is interposed.

In the figure, 11 is a switch mechanism that detects the operation of the foot brake, accelerator, and in the case of a manual vehicle, a clutch (all not shown), and 12 is a switch mechanism that detects whether the vehicle is tilted forward or backward, and to what extent. 13 is an engine rotation sensor that detects the rotational force of the engine 4 side. 14 is a rotation sensor that detects the rotational force of the rear wheel 5 side. The axle torque generated when the vector component of the power applied from the engine and the backward (forward) gravity applied to the rear wheels when going uphill (downhill) is applied to the axle from differences and fluctuations in rotational force, etc., is calculated. Note that a torque sensor may be provided to directly detect the axle torque.

15 is a load sensor provided on each of the front and rear wheels; 16 is a suspension; 17 is a power transmission mechanism; 18
is a control signal that determines the forward/reverse state from the transmission. The computer 3 performs predetermined arithmetic processing based on the signals from the sensors and switch mechanisms 11 to 18, and outputs a control signal for controlling the opening/closing of the solenoid valve and determining the optimum opening degree to the solenoid valve 10. .

Next, an embodiment of the present invention, particularly a method for automatically controlling a parking brake in a manual vehicle, will be described with reference to flowcharts shown in FIGS. 2A and 2B. Figure 2
A shows the control method at the time of starting. First, the clutch is turned O.
The computer understands that the vehicle is preparing to start when the vehicle is turned to N (STEP 1), and then determines whether the road condition on which the vehicle is located is downhill, uphill, or flat based on the signal from the vehicle attitude sensor. do.

[0013] When the situation is downhill (STEP
2) Based on the control signal from the transmission, it is determined whether the vehicle is in the forward or reverse state. If the vehicle is in the reverse state, the process goes to STEP 7 for the uphill slope described later. On the other hand, if it is in the forward state, the process proceeds to STEP 3. ) Foot After confirming that the foot brake is ON (ST
EP4), the parking brake is turned OFF by switching the solenoid valve 10 (STEP 9), and the vehicle is started by further turning on the accelerator (STEP 10). This allows safe driving even on downhill slopes.

On the other hand, when the situation is uphill (STEP 6)
), based on the control signal from the transmission, it is determined whether the vehicle is in the forward or reverse state, and if the vehicle is in the reverse state, it goes to STEP 3 of the downhill slope, and if it is in the forward state, it accelerates (STEP 7). While gradually turning on the clutch and gradually turning off the clutch, switch the solenoid valve 10 when the axle torque exceeds 0 (STEP 8), that is, when the power output of the vehicle becomes larger than the vector component of the backward gravity on a slope. Then, turn off the parking brake (STEP 9), and then turn on the accelerator to start the vehicle (STEP 10). This makes it possible to start smoothly on any kind of uphill slope.

[0015] Also, when the ground is flat (STEP 5),
When the axle torque exceeds 0 while gradually turning on the accelerator and gradually turning off the clutch (STEP 8), solenoid valve 1
0 to turn off the parking brake (STEP
9) The vehicle is started by turning on the accelerator further. (STEP 10)

FIG. 2B shows a control method when stopped,
First, the computer determines that the vehicle is preparing to stop by turning off the accelerator, turning on the brake, and turning on the clutch (STEP 11), and then confirms a complete stop based on the signal from the rear wheel rotation sensor. (STEP
12) Next, after the transmission is in the neutral state, it is determined that the driver intends to stop;
The solenoid valve 10 is switched to turn on the parking brake, and the foot brake is turned off to bring the vehicle to a halt. (STEP 13)

[0017]

As described above, according to the present invention, the activation/release of the parking brake can be automated according to the desired purpose, and can be applied not only when the vehicle is stopped/started, but also when starting on a flat ground/starting on a slope. This makes it possible to always operate/release the parking brake reliably and accurately, thereby preventing various driving troubles and accidents caused by incorrect operation of the parking brake, and its practical benefits are extremely large. be.

[Brief explanation of the drawing]

[Fig. 1] Fig. 1 is a schematic diagram of a vehicle in which various parts used in the present invention are laid out.

[Figure 2A] Flowchart diagram showing a method for automatically controlling the parking brake when starting a manual vehicle

[
Figure 2B: Flowchart showing a method for automatically controlling the parking brake when stopped in a manual vehicle

[Explanation of symbols]

1 Parking brake 3 Computer

Claims (2)

[Claims] 1. A parking brake automatic control mechanism that operates/releases the parking brake using controllable fluid pressure or other physical force based on a predetermined control signal, and includes an accelerator, brake, or other maneuvering operation. at least one active signal that detects the operating state of the active signal, and at least one passive sensor that detects the operating state of the passive side corresponding to the active signal, which is arranged in the power path from the engine to the wheels via the power transmission section. A parking brake automatic activation/release method characterized in that the control signal is generated based on both signals. 2. The parking brake automatic activation/release method according to claim 1, wherein both of the signals and a vehicle attitude detection signal are combined to generate an electric signal for activation/release of the parking brake. Parking brake automatic activation/release method