JPS59143747A - Electric parking brake device - Google Patents

Abstract

PURPOSE:To obtain smooth starting of a car on an upward slope by enlarging a time lag as the inclination becomes steeper from the time of the output of a brake releasing command signal to the time of the starting of a brake releasing action of a motor. CONSTITUTION:A motor 6 is driven for rotation to rotate a wind-up member 6 via gear mechanisms 7-9, and a parking brake cable 5 is wound up or upwound to operate or release a brake 3. The operation of this motor 6 is controlled by a controller 11, which receives an inclination signal from an inclination sensor at the start on an upward slope to control a time-lag adjuster, and delivers a brake release command signal to the motor 6 with an adjusted time lag in accordance with the slope.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electric parking rake device for a motor vehicle.

When a car is stopped, it is desirable to apply the parking brake in order to minimize damage caused by a rear-end collision.Also, when stopped on a slope, the car will not move automatically even if the main brake (note brake) is released. You need to apply the parking brake to prevent it from rolling.

However, since conventional parking brakes were manually operated, it was extremely troublesome to operate the parking brake every time the driver stopped, and it also increased driver fatigue. This often resulted in the vehicle dragging or stalling.

To solve this problem, various proposals have been made to automate the operation of the parking brake. For example,
According to Publication No. 21329, there is a drive mechanism that applies a handbrake (parking brake) in response to an activation signal supplied by depressing the foot brake pedal when stopped, and an accelerator while the handbrake is applied. A device for controlling an automobile handbrake J is disclosed, which is characterized by having a release mechanism that releases the handbrake in response to a release signal supplied by pressing the pedal. Also, Jikai Sho 5
According to Publication No. 4-1-054.29, a foot brake switch that responds to a foot brake depression operation;
Power is supplied to the Tanabata that activates the handbrake by each operation with a push button switch that operates when the handbrake is commanded to operate, and the power supply to the motor is stopped in response to the depression of the accelerator pedal or the clutch pedal. A device related to a characteristic "handbrake control TLL device" is disclosed. Furthermore, JP-A-55-140
According to Publication No. 634, parking brake operation detection means detects that the parking brake is applied, accelerator pedal operation detection means detects that the accelerator pedal is depressed, and detects the shift position of the transmission. The invention relates to an automatic parking brake release device for an automobile, which is characterized by comprising a shift position detection means and a release means for releasing the parking brake based on signals from each of these means.

According to these inventions, the above-mentioned problems of manual parking brakes can be solved. However, these inventions cannot solve the following problems.

That is, the actuation and release of the parking brake must be performed appropriately depending on whether the road surface is a flat road or a slope, or depending on the roughness of the road surface slope. It is not possible to perform control accordingly. This causes problems such as the parking brake being released too early, especially when starting on a boarding road, causing the vehicle to lurch backwards.

The present invention solves the above-mentioned problems in automatically operated parking brake devices, and aims to appropriately control the start timing of the parking brake release operation at the time of starting the vehicle in accordance with the road surface gradient.

That is, the present invention provides an electromagnetic device such as a motor that controls the activation and release of a parking brake, a controller that outputs either a brake activation command signal or a brake release command signal to the electromagnetic device, and a controller that outputs either a brake activation command signal or a brake release command signal to the electromagnetic device, and A slope sensor detects the magnitude of the slope, and in response to the signal from the sensor, as the road surface slope increases, the time lag between the output of the brake release command signal and the start of the brake release operation of the electromagnetic device is increased. The invention is characterized by comprising a time lag adjustment means. With this configuration, problems such as the parking brake being released too early and the vehicle moving backwards when starting up an uphill road can be prevented, and smooth starting performance can be achieved.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

As shown in FIG. 1, the brakes 3, 3 provided on the rear wheels 2.2 of the automobile 1 have a brake vibration 4 for the main brake that supplies braking hydraulic pressure when the brake pedal (not shown) is depressed. In addition, a brake cable 5 for a parking brake is connected which mechanically activates the brake 3.3.

The front end of the brake cable 5 is connected to a winding member 10 that is swung by the rotation of the motor 6 via a worm 7, a worm wheel 8, and a pinion 9, and the motor 6 rotates forward (or reverse) from the illustrated state. Winding member 1
When the motor 6 rotates in the direction a, the brake 3.3 is actuated via the canor 5, and if the motor 6 rotates in reverse (or forward rotation) from the state in which the brakes 3, 3 are activated, the brake 3, 3 is released.The rotation of the motor 6 is controlled by the actuation command signal A and the release command signal B from the controller 11 so that the brakes 3, 3 are activated or released. .

As shown in FIG.
A brake fluid level sensor 12 detects the presence or absence of a defect in the main brake system based on the brake fluid level, a vehicle speed sensor 13 detects medium speed, an ignition switch 14, and a voltage generated by the regulator that operates and stops the T-engine. a regulator voltage sensor 15 that detects [, a position sensor 16 that detects the gear position of the transmission, an accelerator sensor 17 that detects whether the accelerator pedal is depressed, and a brake pedal that detects whether the brake pedal is depressed. Signals C-J are inputted from the main brake sensor 18, which detects whether or not the vehicle is running, and the slope sensor 19, which detects the magnitude of the road surface slope. Then, the controller 11
is configured to output a brake activation command signal A or a release command signal B to the motor 6 via the drive unit 20 based on these signals C-J, but the release command signal @
B is output via the time lag adjuster 21. Also,
The motor drive unit 20 includes a manual switch 2 when switching from automatic control by the controller 11 to manual operation.
The motor 6 is equipped with a stop timing detection sensor 23, and the motor stop signal K from the sensor 23 is input to the controller 11. is input.

Further, the controller 11 is set with a time lag characteristic when the 21 brake is released, which increases as the road surface gradient increases, as shown in FIG. Here, the time lag is the time from when the brake release command signal is output to when the motor 6 starts the brake release operation, as shown in Fig. 4. It is desirable that the value is as shown in .

Table 1 Next, the operation of the above embodiment will be explained according to the flowchart shown in FIG.

First, according to steps $1 to S6 in FIG.
The L1 controller 11 confirms the automatic state based on signals C-G from the brake fluid level sensor 12, vehicle speed sensor 13, ignition switch 14, regulator voltage sensor 15, and position sensor 16. Then, it is confirmed by each of the above signals C-G that there is no defect in the main brake system, and that the conditions for controlling the parking brake are in place, that is, the vehicle speed is less than or equal to the set vehicle speed V, and the deceleration rate is It is normal and the ignition switch is turned on.
If it is confirmed that the engine is running and the direction of travel of the vehicle (forward or reverse) matches the gear position, the parking brake is activated by the manual switch 22 according to steps 87 to S10. Control takes place. That is, when the manual switch 22 is operated to the operating position, a brake operation command signal A' is output to the motor 6, and when the switch 22 is operated to the release position, a brake release command signal B' is output. . As a result, the parking brake is activated or released by manual switch operation. In this case, if the signal C from the brake fluid level sensor 12 indicates that there is a defect in the main brake system, step S1 is performed regardless of whether the above conditions for parking brake control are met. Then, according to steps 87 to S10, the parking brake can be controlled by the manual switch 22. In addition, if there is no defect in the main brake system, if the vehicle speed is higher than the set vehicle speed V or if the deceleration rate is abnormal, the parking brake will not be controlled (steps S2, 83), and if the ignition switch is OFF. , when the engine is stopped, and when the direction of travel of the vehicle does not match the gear position of the transmission, the parking brake is activated regardless of the state of the manual switch 22 (steps 84.Ss, S6, 8B).

However, if the manual switch 23 is not operated to either the activated position or the released position, the parking brake is automatically controlled as follows according to steps 811-822.

First, after confirming that the automatic control prohibition signal that is output when automatic control is not desirable based on the driving condition of the vehicle, etc. is not being output, and that the changeover switch to automatic control is turned on, Vehicle speed hint +113, signal from accelerator sensor 17 and main brake sensor 18, H
, l to check whether the operating conditions for the parking brake are met. When these conditions are met, that is, the vehicle speed is 0, the accelerator pedal is released, and the brake pedal is released. If it is confirmed that the brake pedal is depressed, a brake operation command signal A is output from the controller 11 to the motor 6. As a result, the motor 6 rotates in the brake activation direction until the stop timing detection sensor 23 outputs the signal K, and the parking brake is activated.

After the parking brake has been activated in this manner, when the accelerator pedal is depressed to start the automobile, and a signal 1 from the accelerator sensor 17 indicating this is input to the controller 11, the controller 11 moves to the step shown in FIG. From step s14, the conditions for removing the parking brake are confirmed according to step s11 and step S18.

When this condition is met, that is, when the accelerator pedal is depressed, the signal G from the position sensor 16 indicates that the transmission is in the running position, and the signal (2) from the main brake sensor 18 indicates that the brake pedal is in the driving position. A brake release command signal B is output to the motor 6 when the brake release command signal B indicates that the brake is released.

When releasing the parking brake in this case,
First, the slope of the road surface is measured by the signal J from the slope sensor 19, and a time lag corresponding to the measured slope is set according to the characteristics shown in FIG. 3 stored in the controller 11 (step 319). .52o)
. Then, the time lag adjuster 21 measures the elapsed time from the output of the brake release command signal B, and compares this elapsed time with the set time of the time lag, and when the set time is up, the motor 6 is braked. The operation in the release direction is started (step 821
, 822). As a result, the timing of the start of the parking brake release operation can be appropriately controlled according to the road surface gradient, which can prevent problems such as the car backing up due to the parking brake being released too early when starting on a steep road. is resolved.

As described above, according to the present invention, in the electric parking brake device that automatically controls the activation and release of the parking brake, the timing of starting the release operation of the parking brake is appropriately controlled according to the road surface slope. .

This eliminates the problem of the vehicle moving backwards due to the parking brake being released too early when starting up an uphill road, and a good starting operation can always be obtained.

In addition, the present invention provides means for operating the parking brake,
In place of the motor shown in the above embodiment, for example, a solenoid valve or the like installed in a fluid pressure supply path to a fluid actuator connected to a brake cable may be used.

[Brief explanation of drawings]

Fig. 1 is a schematic control system diagram showing an embodiment of the present invention, Fig. 2 is a block diagram, Fig. 3 is a characteristic diagram set in the controller, Fig. 4 is an explanatory diagram of time lag, and Fig. 5 is a block diagram of the same. It is a flowchart figure which shows the operation|movement of an Example. 6... Electromagnetic device (motor), 11... Controller, 19... Slope sensor, 21... Time lag adjustment means Applicant: Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] (1) An electric parking brake device comprising an electromagnetic device that controls activation and release of a parking brake, and a controller that outputs either a brake activation command signal or a brake release command signal to the electromagnetic device, A slope sensor detects the magnitude of the road surface slope, and in response to signals from the sensor, the time lag between the output of the brake release command signal and the start of the brake release operation of the electromagnetic device is reduced as the road surface slope increases. An electric parking brake device characterized in that it is equipped with a time lag adjustment means for increasing the time lag.