Control method and device for solving vehicle brake fluid overtemperature

Abstract

The present invention discloses a control method for resolving vehicle brake fluid overheating. During vehicle driving, the temperature of the brake fluid is acquired in real time. When the temperature of the brake fluid exceeds a first set value, the brake fluid is controlled to circulate to reduce the temperature of the brake fluid until the temperature of the brake fluid is lower than a second set value, and the second set value is lower than the first set value. The control method for resolving vehicle brake fluid overheating of the present invention circulates the brake fluid in the brake to reduce the brake fluid temperature while maintaining the braking force required by the driver when the brake fluid temperature is high, thereby resolving the brake fluid overheating and improving vehicle driving safety. The present invention also provides a device for resolving vehicle brake fluid overheating.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle driving safety, and in particular to a control method and device for solving the problem of vehicle brake fluid overheating. Background Art

[0002] Continuous braking while the vehicle is in motion can cause the brake fluid to overheat (especially in continuous downhill conditions) and even cause the brake fluid to boil, leading to brake failure and vehicle safety accidents, resulting in significant loss of life and property.

[0003] The existing technology lacks a method that can effectively solve the problem of vehicle brake fluid overheating. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a control method for solving vehicle brake fluid overtemperature, the purpose of which is to improve vehicle driving safety.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a control method for solving the problem of vehicle brake fluid overheating, in which the temperature of the brake fluid is obtained in real time during vehicle driving. When the temperature of the brake fluid exceeds a first set value, the brake fluid is controlled to circulate to reduce the temperature of the brake fluid until the temperature of the brake fluid is lower than a second set value, and the second set value is less than the first set value.

[0006] During vehicle driving, the temperature of the brake fluid is obtained through a temperature sensor or a brake temperature estimation model.

[0007] When the brake fluid is controlled to circulate, the brake fluid is pumped into the brake through the booster mechanism, and then the brake fluid is released into the reservoir through the pressure relief valve.

[0008] The pressurizing mechanism is connected to the liquid reservoir.

[0009] A shutoff valve is provided between the pressure-boosting mechanism and the brake.

[0010] The present invention also provides a device for solving the problem of overheating of vehicle brake fluid, including a booster mechanism for providing brake fluid to the brake, a pressure relief valve connected to the brake, and a reservoir connected to the pressure relief valve, wherein the reservoir is connected to the booster mechanism.

[0011] A shutoff valve is provided between the pressure-boosting mechanism and the brake.

[0012] A pressure sensor is provided in the hydraulic pipeline connecting the boosting mechanism and the brake.

[0013] The boosting mechanism is connected to the motor.

[0014] The control method for solving vehicle brake fluid overheating of the present invention circulates the brake fluid in the brake to reduce the brake fluid temperature when the brake fluid temperature is high while maintaining the braking force required by the driver, thereby solving the problem of brake fluid overheating and improving vehicle driving safety. The method is also more cost-effective. When the brake fluid is detected to be overheated, the brake fluid is circulated to reduce the brake fluid temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This manual includes the following drawings, which show the following contents:

[0016] Figure 1 It is a structural schematic diagram of a device for solving vehicle brake fluid overheating of the present invention;

[0017] Figure 2 It is a schematic diagram of the brake fluid circulation during braking;

[0018] Figure 3 It is a schematic diagram of brake fluid filling during braking;

[0019] The following are marked in the figure:

[0020] 1. Booster mechanism; 2. Pressure relief valve; 3. Liquid reservoir; 4. Isolation valve; 5. Pressure sensor; 6. Motor; 7. Brake. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation methods of the present invention through the description of embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0022] The present invention provides a control method for solving the problem of overheating of vehicle brake fluid. During vehicle driving, the temperature of the brake fluid is obtained in real time. When the temperature of the brake fluid exceeds a first set value, the brake fluid is controlled to circulate. The circulating brake fluid can dissipate heat to reduce the temperature of the brake fluid. Until the temperature of the brake fluid is lower than a second set value, the brake fluid stops circulating and the brake fluid circulation control is exited. The second set value is less than the first set value.

[0023] Specifically, the temperature of the brake fluid in the brake lines is acquired in real time while the vehicle is in motion. If the brake fluid is overheated, the brake fluid circulation is controlled to reduce the brake fluid temperature while ensuring the braking force required by the driver. The brake fluid temperature can be acquired while the vehicle is in motion using a temperature sensor or a brake temperature estimation model.

[0024] When the brake fluid is controlled to circulate, the brake fluid is pumped into the brake 7 through the pressure boosting mechanism 1 , and then the brake fluid in the brake 7 is released into the reservoir 3 through the pressure relief valve 2 .

[0025] The brake fluid is pumped into the brake 7 through the boosting mechanism 1, and then released into the reservoir 3 through the wheel pressure relief valve 2. During the entire process, it is necessary to ensure that the amount of fluid in the brake 7 can generate the required braking force of the driver; when the fluid level of the boosting mechanism 1 is insufficient, the boosting mechanism 1 can be withdrawn to replenish fluid from the reservoir 3 and then boost pressure to the brake 7.

[0026] The method of the present invention is based on a decoupled brake-by-wire system. The most significant feature of a decoupled brake system is that driver braking and vehicle braking are independent of each other. Therefore, any adjustment of brake 7 pressure will not affect the driver's braking feel. The driver's braking does not directly affect the wheels. The brake-by-wire system calculates the driver's braking deceleration requirement based on the displacement signal generated by the driver's depressing the brake pedal. The system then controls motor 6 to push booster mechanism 1 to apply pressure, causing brake 7 to generate braking pressure.

[0027] like Figure 2 and Figure 3 As shown, the control method for solving vehicle brake fluid overtemperature provided by the present invention includes the following steps:

[0028] S1. During vehicle driving, the temperature of the brake fluid is obtained in real time. When the temperature of the brake fluid exceeds a first set value, over-temperature control is performed; when the temperature of the brake fluid is lower than a second set value, over-temperature control is exited; wherein the first set value is greater than the second set value;

[0029] S2. During vehicle movement, motor 6 is controlled to move the piston of booster mechanism 1 to establish the line pressure value P_target required for the driver to depress the brake pedal (P_target is 0 when not braking). When the brake fluid is overheated, booster mechanism 1 and pressure relief valve 2 are controlled to operate so that brake fluid flows into and out of brake 7 at the same rate, thus dynamically balancing the inflow and outflow of fluid from brake 7. At the same time, closed-loop correction is performed based on the deviation between the actual pressure value P detected by pressure sensor 5 and P_target to ensure the driver's braking request.

[0030] S3. When the piston in the booster mechanism 1 is pushed close to the end of the cylinder, the isolation valve 4 and the pressure relief valve 2 are closed; then the motor 6 is controlled to drive the piston back to its original position, the brake fluid is replenished from the reservoir 3, and the action of S2 is repeated again.

[0031] like Figures 1 to 3 As shown, the present invention also provides a device for solving the problem of overheating of vehicle brake fluid, including a booster mechanism 1 for providing brake fluid to the brake 7, a pressure relief valve 2 connected to the brake 7, and a reservoir 3 connected to the pressure relief valve 2, the reservoir 3 is connected to the booster mechanism 1, and the reservoir 3 is used to store brake fluid in the brake system.

[0032] like Figures 1 to 3 As shown, a shutoff valve 4 is provided between the boosting mechanism 1 and the brake 7 , and a pressure sensor 5 is provided in the hydraulic pipeline connecting the boosting mechanism 1 and the brake 7 , and the actual pressure in the hydraulic pipeline is monitored by the pressure sensor 5 .

[0033] like Figures 1 to 3 As shown, the booster mechanism 1 is connected to the motor 6, which provides driving force for the booster mechanism 1. Driven by the motor 6, the brake fluid in the cylinder of the booster mechanism 1 is pushed forward to build up pressure, pushing the piston in the cylinder of the booster mechanism 1 forward, causing the brake fluid in the cylinder to flow into the brake 7, controlling the brake 7 to apply braking. The piston in the cylinder of the booster mechanism 1 moves backward, causing the brake fluid in the reservoir 3 to flow into the cylinder, causing the booster mechanism 1 to replenish fluid.

[0034] like Figures 1 to 3 As shown, the oil inlet of the pressure relief valve 2 is connected to the brake 7, and the oil outlet of the pressure relief valve 2 is connected to the reservoir 3. The pressure relief valve 2 is used to unload the braking pressure of the wheel cylinder and allow the brake fluid to flow into the reservoir 3.

[0035] like Figures 1 to 3 As shown, the oil inlet of the isolation valve 4 is connected to the boosting mechanism 1, and the oil outlet of the isolation valve 4 is connected to the brake 7. The isolation valve 4 is used to isolate the boosting mechanism 1 and the brake 7. When the boosting mechanism 1 is replenished with fluid, the wheel cylinder pressure is kept from being lost. The isolation valve 4 allows the brake fluid to flow only in the direction from the boosting mechanism 1 to the brake 7.

[0036] like Figure 2 As shown, when the vehicle brakes, the brake fluid is pressed into the brake 7 by the booster mechanism 1, and then enters the reservoir 3 through the pressure relief valve 2. When replenishing the fluid, the brake fluid in the reservoir 3 is sucked into the booster mechanism 1, and then pressed into the brake 7. In this way, the brake fluid circulates in the entire brake system, achieving the purpose of cooling.

[0037] like Figure 3 As shown, when the boosting mechanism 1 needs to be replenished with fluid, the isolation valve 4 is energized to isolate the boosting mechanism 1 and the brake 7, and the boosting mechanism 1 withdraws to suck brake fluid from the reservoir 3. When enough brake fluid is sucked in, the replenishment is completed, the isolation valve 4 is de-energized, and the boosting mechanism 1 can boost the brake 7 again.

[0038] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A control method for solving vehicle brake fluid overheating, characterized in that: During vehicle driving, the temperature of the brake fluid is obtained in real time. When the temperature of the brake fluid exceeds a first set value, the brake fluid is controlled to circulate to reduce the temperature of the brake fluid until the temperature of the brake fluid is lower than a second set value, which is lower than the first set value. When the brake fluid is controlled to circulate, the brake fluid is pumped into the brake through the booster mechanism, and then the brake fluid is released into the reservoir through the pressure relief valve.

2. The control method for solving vehicle brake fluid overtemperature according to claim 1, characterized in that: During vehicle driving, the temperature of the brake fluid is obtained through a temperature sensor or a brake temperature estimation model.

3. The control method for solving vehicle brake fluid overtemperature according to claim 1, characterized in that: The pressurizing mechanism is connected to the liquid reservoir.

4. The control method for solving vehicle brake fluid overtemperature according to claim 1, characterized in that: A shutoff valve is provided between the pressure-boosting mechanism and the brake.

5. A device for solving vehicle brake fluid overheating, used to execute the control method according to any one of claims 1 to 4, characterized in that: The device comprises a pressure-boosting mechanism for providing brake fluid to the brake, a pressure relief valve connected to the brake, and a fluid reservoir connected to the pressure relief valve, wherein the fluid reservoir is connected to the pressure-boosting mechanism.

6. The device for solving vehicle brake fluid overheating according to claim 5, characterized in that: A shutoff valve is provided between the pressure-boosting mechanism and the brake.

7. The device for solving vehicle brake fluid overheating according to claim 6, characterized in that: A pressure sensor is provided in the hydraulic pipeline connecting the boosting mechanism and the brake.

8. The device for solving vehicle brake fluid overheating according to claim 5, characterized in that: The boosting mechanism is connected to the motor.

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