CN113879273A

CN113879273A - Control method and system for preventing rusty adhesion of friction block and brake disc based on electronic parking

Info

Publication number: CN113879273A
Application number: CN202111278213.7A
Authority: CN
Inventors: 吕凌志; 李海霞; 王超
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2021-10-30
Filing date: 2021-10-30
Publication date: 2022-01-04

Abstract

The invention discloses an electronic parking control method and system for preventing a brake device from being rusted and adhered, wherein the electronic parking control method comprises the following steps: step 1, after a vehicle enters an electronic parking state, a controller continuously acquires a rainfall signal; step 2, judging whether the rainfall is finished or not by the controller according to the rainfall signal; step 3, acquiring a gradient signal and a gear signal after rainfall is finished; step 4, judging whether the braking force reducing condition is met or not by combining the gradient signal and the gear signal; and 5, controlling the electronic parking brake caliper to execute a releasing action after the braking force reducing condition is met, and realizing air circulation and moisture drying of the rear wheel electronic brake caliper. The invention can be used for vehicles which are parked outdoors for a long time and pass through rainy and humid days, ensures the braking safety and solves the problem of corrosion and adhesion of the braking friction block and the brake disc.

Description

Control method and system for preventing rusty adhesion of friction block and brake disc based on electronic parking

Technical Field

The invention relates to the field of electronic parking of an automobile chassis braking system, in particular to a structure for preventing a friction block and a brake disc from being rusted and adhered and a control method.

Background

In the chassis brake system of a motor vehicle, electronic parking is a basic arrangement. The working mode is as shown in fig. 1, after the vehicle stops, the electronic parking switch 1 is started, the electronic parking controller 2 controls the electronic parking brake caliper 3 to press the friction block 31 on the brake disc 4 to form parking brake, and the electronic parking brake cannot be released until the vehicle is driven next time.

The problems existing in the prior art are as follows: if the vehicle is parked outdoors for a long time, the friction blocks 31 and the brake disc 4 may be rusted or even rusted and stuck after rain and wet weather. When the driver drives again, the electronic parking cannot be normally released; and the local unevenness of the brake disc is caused by corrosion, and the brake shake is generated in the subsequent driving braking process, so that the riding comfort and the safety are influenced. This phenomenon is not an example, and vehicles parked for a long period of time (more than one month) and subjected to rainy and humid weather have different degrees of shaking caused by rust adhesion.

Therefore, for vehicles parked outdoors for a long time, it is a problem to be solved at present to find a parking brake scheme that does not generate rust adhesion.

Through search, patent document CN106240553A discloses a method for removing water from an automotive disc brake based on an electronic stability control system, which is used for removing water from the surface of a brake disc after a vehicle runs and wades in rainy days. The method is characterized in that the determination is carried out through a rainfall sensor, a temperature sensor, a wiper switch and the like, and the ESC is adopted to apply braking force to dehydrate after the vehicle is determined to be involved in driving. The technology can not solve the problem of corrosion and adhesion of a friction block and a brake disc after the vehicle is parked for a long time.

Disclosure of Invention

The invention provides a control method and a control system for preventing rusty adhesion of a friction block and a brake disc based on electronic parking, which are used for solving the problem of rusty adhesion of the brake friction block and the brake disc while ensuring the braking safety of a vehicle parked outdoors for a long time and in rainy and humid weather.

The technical scheme adopted by the invention is as follows:

the invention provides a control method for preventing rusty adhesion of a friction block and a brake disc based on electronic parking, which comprises the following steps:

step 1, after a vehicle enters an electronic parking state, a controller continuously acquires a rainfall signal.

And 2, judging whether the rainfall is finished or not by the controller according to the rainfall signal.

And step 3, acquiring a gradient signal and a gear signal after rainfall is finished.

And 4, judging whether the braking force reducing condition is met or not by combining the gradient signal and the gear signal.

And 5, controlling the electronic parking brake caliper to execute a releasing action after the braking force reducing condition is met, and realizing air circulation and moisture drying of the rear wheel electronic brake caliper.

Further, the step 4 specifically includes: and when the gradient is smaller than the threshold value A and the gear signal is P gear, the condition of reducing the braking force is considered to be met. The threshold value A ranges from 3% to 10%.

Further, the release action of step 5 is specifically: releasing one side of the rear wheel electronic parking brake caliper to separate the friction block from the brake disc, and simultaneously performing single-wheel braking and keeping time T by the other side of the rear wheel electronic brake caliper, wherein the range of T is not less than 30 minutes; then, the electronic brake calipers of the two rear wheels are exchanged to execute the same action.

The invention further provides an electronic parking control system which comprises an electronic parking switch, an electronic parking controller, an electronic parking brake caliper, a brake disc, a rainfall ambient light sensor, a gradient sensor, a vehicle body controller and a transmission control unit.

The electronic parking switch provides a switching signal for the electronic parking controller.

The transmission control unit provides gear signals for the electronic parking controller.

The rainfall environment light sensor provides a rainfall signal for the automobile body controller.

The grade sensor provides a grade signal for the vehicle body controller.

The vehicle body controller provides the processed rainfall signal and the processed gradient signal for the electronic parking controller.

The electronic parking controller executes the electronic parking control method in the technical scheme.

The electronic parking brake caliper is controlled by an electronic parking controller to clamp or release a friction block to a brake disc.

According to the technical scheme, the electronic parking switch, the rainfall environment light sensor and the gradient sensor are used for judging, when it is judged that the vehicle is parked in rainy days, the ESC (ESC release brake force is respectively cancelled to respectively cancel the brake force of the left rear single wheel and the brake force of the right rear single wheel) is used for preventing corrosion and adhesion, and the electronic parking switch is used for preventing the brake disc from rusting when the vehicle is parked in rainy days.

According to the invention, vehicle hardware is communicated, signals of the sensor and the processor are shared, and a brand-new control method is adopted, so that the function of preventing the friction block and the brake disc from being rusted and adhered on the premise of ensuring the parking braking safety is realized, the user experience can be improved, the safety risk caused by rusting and adhering can be avoided, and the maintenance cost can be reduced.

Drawings

FIG. 1 is a schematic diagram of background art;

FIG. 2 is a schematic diagram of the control system of the present invention;

FIG. 3 is a logic diagram of the control method of the present invention.

In the figure: the parking brake system comprises 1-an electronic parking switch, 2-an electronic parking controller, 3-an electronic parking brake caliper, 31-a friction block, 4-a brake disc, 5-a vehicle body controller, 6-a transmission control unit, 7-a rainfall ambient light sensor and 8-a gradient sensor.

Detailed Description

The technical implementation mode of the invention is further explained in detail in the following with the accompanying drawings.

As shown in fig. 2, the control system shown in this embodiment mainly includes an electronic parking switch 1, an electronic parking controller 2, an electronic parking brake caliper 3, a friction block 31, a brake disc 4, a vehicle body controller 5 (or other controllers that process a rainfall ambient light signal and a gradient signal), a transmission control unit 6, a rainfall ambient light sensor 7, a gradient sensor 8, and a related wiring harness.

The electronic parking switch 1 is connected to the electronic parking controller 2 through a wire harness and provides a switching signal for the electronic parking controller.

The transmission control unit 6 is connected to the electronic parking controller 2 through a wire harness, and provides a gear signal for the electronic parking controller.

The rainfall environment light sensor 7 is connected to the vehicle body controller 5 through a wire harness, and provides a rainfall signal thereto.

The gradient sensor 8 is connected to the vehicle body controller 5 through a wire harness, and provides a gradient signal thereto.

The vehicle body controller 5 is connected to the electronic parking controller 2 through a wire harness, and provides the processed rainfall signal and the processed gradient signal for the vehicle body controller.

The electronic parking brake caliper 3 is linked to the electronic parking controller 2 through a wire harness, and clamps or releases the friction block 31 to the brake disc 4 under the control of the electronic parking controller 2.

The electronic parking brake caliper 3 and the brake disc 4 are provided with two sets and distributed at the left rear wheel end and the right rear wheel end of the vehicle.

The above hardware is all the parts already carried on the current vehicle, but the hardware is not completely communicated with each other in the prior art to cooperate. The connection of the components of the invention includes but is not limited to the way mentioned in this patent, and CAN also be achieved by the connection of the CAN network of the automobile and the transmission of signals to achieve the cooperative work.

Another embodiment of the invention shows a control method, the core logic is that after parking, an electronic parking system works, and a brake caliper and a brake disc of the electronic parking are clamped; when the rainfall environment light sensor detects rain, a signal is sent out; after receiving the rainfall signal, the vehicle body controller sends the rainfall signal and the ramp signal to the electronic parking controller; the transmission control unit TCU transmits the gear signal to the electronic parking controller; the electronic parking control combines rainfall signal, slope signal, gear signal, judges, accords with under the safe prerequisite of parking, divides left and right release electron parking braking pincers in proper order, and then avoids the corrosion adhesion.

The specific logic of the control method is shown in fig. 3.

Step 1, after parking, a driver outputs a parking signal to the electronic parking controller 2 through the switch 1, and the electronic parking controller 2 controls the electronic parking brake caliper 3 to clamp the friction block 31 to the brake disc 4, so that parking is formed.

The rainfall environment light sensor 7 continuously detects the rainfall signal and transmits the rainfall signal to the vehicle body controller 5, and the vehicle body controller 5 processes the rainfall signal and transmits the processed rainfall signal to the electronic parking controller 2.

And 2, when the electronic parking controller 2 receives the rain signal and then receives the rain stop signal again, judging that the rain is finished, sending a gradient signal request to the vehicle body controller 5, and sending a gear signal request to the transmission control unit 6.

And 3, the vehicle body controller 5 processes the signal of the gradient sensor 8 and outputs the processed signal to the electronic parking controller 2. The variable counter control unit 6 outputs the gear signal to the electronic parking controller 2.

And 4, judging by the electronic parking controller 2 by combining the gradient signal and the gear signal. When the gradient is smaller than the threshold value A (for example, 3 degrees, the gradient is considered to be small, the required parking force is small), and the gear signal is P gear (certain engine braking capability is considered to be provided, and the risk of vehicle sliding cannot be caused even if the parking force is reduced), the condition of reducing the braking force is considered to be provided.

And 5, controlling the electronic parking brake caliper 3 to execute a drying action by the electronic parking controller 2. The drying action is specifically as follows: the left rear wheel electronic parking brake caliper 3 is released firstly, and the right rear wheel electronic brake caliper 3 is used for single-wheel braking and is kept for 30 minutes; and then clamping the left rear wheel electronic brake caliper 3 and releasing the right rear wheel electronic parking brake caliper 3, and braking and keeping for 30 minutes by the left rear wheel electronic brake caliper 3 in a single wheel mode. After the electronic parking brake caliper 3 is released, the friction block 31 is separated from the brake disc 4, so that air circulation and moisture drying are facilitated, and corrosion adhesion is avoided.

Further, in the releasing process executed in the step 5, if it rains again, the releasing action is still executed until the releasing action is finished; after the execution is finished, a new rain detection cycle is started, the rain stops, and the subsequent release control is started again.

In the foregoing specification, the subject matter of the invention has been described with reference to specific examples. However, various modifications and changes may be made without departing from the gist of the present invention as set forth in the claims. The drawings in the present specification are illustrative and not restrictive. The scope of the inventive concept should, therefore, be determined by the claims and their legal equivalents, rather than by the examples described. Any steps set forth in any method or process claims of this specification may be performed in any order or combination of orders and are not limited to the specific order presented in the examples given in the claims.

Claims

1. A control method for preventing rusty adhesion of a friction block and a brake disc based on electronic parking is characterized by comprising the following steps:

step 1, after a vehicle enters an electronic parking state, a controller continuously acquires a rainfall signal;

step 2, judging whether the rainfall is finished or not by the controller according to the rainfall signal;

step 3, acquiring a gradient signal and a gear signal after rainfall is finished;

step 4, judging whether the braking force reducing condition is met or not by combining the gradient signal and the gear signal;

and 5, controlling the electronic parking brake caliper to execute a releasing action after the braking force reducing condition is met, and realizing air circulation and moisture drying of the wheel electronic brake caliper.

2. The method for preventing rusty adhesion of the friction block and the brake disc based on electronic parking according to claim 1, wherein the step 4 is specifically as follows: and when the gradient is smaller than a threshold value A and the gear signal is P gear, the condition of reducing the braking force is considered to be met, and the range of the threshold value A is 3% -10%.

3. The method for preventing rusty adhesion of the friction block and the brake disc based on electronic parking according to claim 1, wherein the release action of step 5 is specifically: firstly releasing the electronic parking brake caliper of the wheel on one side to separate a friction block from a brake disc, and simultaneously braking the electronic brake caliper of the wheel on the other side for a time T in a single wheel mode, wherein the range of T is not less than 30 minutes; then the electronic brake calipers of the two wheels are exchanged to execute the same action.

4. The method for controlling the friction blocks and the brake discs to prevent the rusty adhesion based on the electronic parking according to claim 1, wherein the step 2 determines whether the rainfall is finished under the condition that the controller 2 receives the signal of raining again and then determines that the rainfall is finished.

5. The method for preventing rusty adhesion of friction blocks and brake discs according to any one of claims 1-4, wherein during the release in step 5, if it rains again, the release will continue to be completed; after the execution is finished, a new rain detection cycle is started, the rain stops, and the subsequent release control is started again.

6. A control system for preventing a friction block and a brake disc from being rusted and adhered based on electronic parking is characterized by comprising an electronic parking switch, an electronic parking controller, an electronic parking brake caliper, a brake disc, a rainfall environment light sensor, a gradient sensor, a vehicle body controller and a transmission control unit;

the electronic parking switch provides a switching signal for the electronic parking controller;

the transmission control unit provides gear signals for the electronic parking controller;

the rainfall environment light sensor provides a rainfall signal for the automobile body controller;

the gradient sensor provides a gradient signal for the vehicle body controller;

the vehicle body controller provides the processed rainfall signal and the processed gradient signal for the electronic parking controller;

the electronic parking controller executes the electronic parking control method of any one of claims 1-4;