CN-121973747-A - Electronic mechanical braking thermal alarm system and control method

Abstract

The invention provides an electronic mechanical braking thermal alarm system and a control method, wherein a brake controller calculates four-wheel braking force requirements according to input of a brake pedal and sends target braking force to an electronic mechanical caliper, the electronic mechanical caliper sends a control command to a caliper motor after receiving the target braking force, the temperature of a brake disc and the rigidity of the caliper are calculated according to actuation parameters of the electronic mechanical caliper and parameters of a whole vehicle system, the temperature of the brake disc and rigidity information of the caliper are sent to the brake controller, and the brake controller judges whether an alarm threshold is met or not through a thermal alarm judging module and sends a thermal alarm signal. The invention calculates the temperature of the brake disc and the rigidity of the calipers by adopting the working parameters of the actuators in the electromechanical brake system and the system parameters which are easy to obtain on the whole vehicle. The overheat state of the braking system is identified through two dimensions such as the temperature of the braking disc and the rigidity of the calipers, and a thermal alarm signal is sent out, so that the braking safety of the electromechanical braking system can be improved, and the vehicle using experience of a user is improved.

Inventors

• LIU SHUYA
• ZHANG JIAHONG

Assignees

• 上海埃利维智行科技有限公司

Dates

Publication Date

20260505

Application Date

20240130

Claims (10)

1. 1. The electronic mechanical brake thermal alarm system is characterized by comprising a brake pedal, a brake controller and an electronic mechanical caliper arranged at the wheel end of a four wheel, wherein the brake controller is internally provided with a brake force demand calculation module and a thermal alarm judgment module; The brake controller calculates four-wheel braking force requirements according to the input of the brake pedal through the braking force requirement calculation module and sends target braking force to the electromechanical calipers; After the electromechanical calipers receive the target braking force, the control instructions are sent to the calipers motor through the wheel side braking force control module, so that the electromechanical calipers are enabled to act; according to the actuation parameters of the electromechanical calipers, the temperature of the brake disc and the rigidity of the calipers are calculated by combining the state parameters of the whole vehicle and the wheel speed information; And the brake controller judges whether the alarm threshold is met or not through the thermal alarm judging module and sends a thermal alarm signal.
2. 2. The method for controlling an electromechanical brake thermal alarm system according to claim 1, comprising the steps of: s1, the brake controller calculates four-wheel braking force requirements according to the input of a brake pedal and sends target braking force to the electromechanical calipers; S2, after the electromechanical calipers receive target braking force, a control instruction is sent to the calipers motor through the wheel side braking force control module, so that the electromechanical calipers act; s3, calculating the temperature of the brake disc and the rigidity of the calipers according to the actuation parameters of the electromechanical calipers by combining the state parameters of the whole vehicle and the wheel speed information; and S4, the four wheels send the temperature of the brake disc and the rigidity information of the calipers to the brake controller, and the brake controller judges whether the first alarm threshold and the second alarm threshold are met or not through the thermal alarm judging module, and sends a thermal alarm signal when the first alarm threshold and the second alarm threshold are exceeded.
3. 3. The method according to claim 2, wherein in S3, the electromechanical caliper calculates a brake disc temperature and a caliper stiffness by the brake disc temperature calculation module and the caliper stiffness calculation module.
4. 4. The method for controlling an electromechanical brake thermal alarm system according to claim 3, wherein the caliper controller controls the caliper motor to operate when the electromechanical caliper receives a motor control command sent by the wheel braking force control module, and the caliper controller is provided with a motor current and motor rotation angle measuring device.
5. 5. The method for controlling an electromechanical brake thermal alarm system according to claim 4, wherein a caliper clamping force estimation module is provided in the caliper controller, and the caliper clamping force estimation module estimates a caliper clamping force according to motor current and motor rotation angle information, and feeds back a caliper clamping force estimation value to the wheel side braking force control module to compare with a target clamping force, thereby adjusting a motor control command.
6. 6. The method according to claim 5, wherein the brake disc temperature calculation module fuses the caliper clamping force estimated value with the vehicle operation parameter and the wheel speed information, and calculates the brake disc operating temperature in real time.
7. 7. The method of claim 6, wherein the vehicle operating parameters include at least ambient temperature and sleep time signals, and the wheel speed information is transmitted to the brake disc temperature calculation module using a wheel speed sensor.
8. 8. The method for controlling an electromechanical brake thermal alarm system according to claim 6, wherein the caliper stiffness calculation module calculates the caliper stiffness in combination with the estimated caliper clamping force and the motor rotation angle information, compares the caliper stiffness calculated in real time with the stored initial stiffness, and outputs the caliper stiffness attenuation value.
9. 9. The method for controlling an electromechanical brake thermal alarm system according to claim 8, wherein the thermal alarm discriminating module includes a first alarm threshold and a second alarm threshold, and transmits the first alarm signal or the second alarm signal to the whole vehicle according to the alarm threshold satisfied, and prompts the driver, and simultaneously transmits a speed limit request to the vehicle driving system.
10. 10. The method for controlling an electromechanical brake thermal alarm system according to claim 9, wherein when the temperature of any brake disc exceeds a threshold value set by the first alarm threshold, the first alarm signal is a brake overheat alarm signal, and the first alarm signal includes a text prompt and an audio prompt; And when the temperature of any brake disc exceeds a threshold value set by the second alarm threshold, and the stiffness attenuation value of the caliper exceeds the threshold value, sending out a second alarm signal, wherein the second alarm signal is a braking overheat alarm signal, and comprises a text prompt and an audio prompt, and simultaneously sending out a speed limiting request of the whole vehicle, namely sending out a speed limiting request to a vehicle driving system.

Description

Electronic mechanical braking thermal alarm system and control method Technical Field The invention relates to the technical field of braking equipment, in particular to an electronic mechanical braking thermal alarm system and a control method. Background Under the working condition of frequent braking or high-strength braking of the automobile, a large amount of heat is stored in the braking parts in a short time, so that the temperature of the braking parts such as a brake disc and the like is quickly increased. Under the overheat condition, the braking characteristics change, so that the problems of rigidity attenuation of a braking system, reduction of braking deceleration, lengthening of braking distance and the like are caused. When the electromechanical braking system is applied, working parameters in the system can be combined with the whole vehicle state parameters to predict and identify the overheat state of the braking system, and the overheat state can be actively sent to the thermal alarm information. The braking safety can be effectively improved, and the driving experience of a user is improved, so that it is necessary to develop an electronic mechanical braking thermal alarm system. Disclosure of Invention The invention aims to provide an electromechanical braking thermal alarm system and a control method, which can identify the overheat state of a braking system through two dimensions of the temperature of a braking disc, the rigidity of a caliper and the like, send out a thermal alarm signal and improve the braking safety of the electromechanical braking system. According to one object of the invention, the invention provides an electromechanical brake thermal alarm system, which comprises a brake pedal, a brake controller and an electromechanical caliper arranged at the four-wheel end, wherein the brake controller is provided with a braking force demand calculation module and a thermal alarm judgment module; The brake controller calculates four-wheel braking force requirements according to the input of the brake pedal through the braking force requirement calculation module and sends target braking force to the electromechanical calipers; After the electromechanical calipers receive the target braking force, the control instructions are sent to the calipers motor through the wheel side braking force control module, so that the electromechanical calipers are enabled to act; according to the actuation parameters of the electromechanical calipers, the temperature of the brake disc and the rigidity of the calipers are calculated by combining the state parameters of the whole vehicle and the wheel speed information; And the brake controller judges whether the alarm threshold is met or not through the thermal alarm judging module and sends a thermal alarm signal. According to another object of the present invention, the present invention provides a control method of the above-mentioned electromechanical brake thermal alarm system, comprising the steps of: s1, the brake controller calculates four-wheel braking force requirements according to the input of a brake pedal and sends target braking force to the electromechanical calipers; S2, after the electromechanical calipers receive target braking force, a control instruction is sent to the calipers motor through the wheel side braking force control module, so that the electromechanical calipers act; s3, calculating the temperature of the brake disc and the rigidity of the calipers according to the actuation parameters of the electromechanical calipers by combining the state parameters of the whole vehicle and the wheel speed information; and S4, the four wheels send the temperature of the brake disc and the rigidity information of the calipers to the brake controller, and the brake controller judges whether the first alarm threshold and the second alarm threshold are met or not through the thermal alarm judging module, and sends a thermal alarm signal when the first alarm threshold and the second alarm threshold are exceeded. Further, in S3, the electromechanical caliper calculates a brake disc temperature and a caliper stiffness through the brake disc temperature calculation module and the caliper stiffness calculation module. Further, when the electromechanical calipers receive the motor control instruction sent by the wheel braking force control module, the calipers controller controls the calipers motor to act, and the calipers controller is provided with a motor current and motor rotation angle measuring device. And the caliper controller is internally provided with a caliper clamping force estimation module, the caliper clamping force estimation module estimates the caliper clamping force according to the motor current and the motor corner information, and the caliper clamping force estimation value is fed back to the wheel braking force control module and is compared with the target clamping force, so that a motor control instruction is