CN-122009127-A - Automobile, braking system and state diagnosis method for auxiliary parking braking of service braking

CN122009127ACN 122009127 ACN122009127 ACN 122009127ACN-122009127-A

Abstract

The invention discloses an automobile, a braking system and a state diagnosis method of auxiliary parking braking of service braking. In the method, after the locking operation of the brake retainer is completed and the brake motor torque drops to 0, the electrical angle of the brake motor and the clamping force of the brake caliper are monitored. And diagnosing whether the locking operation of the brake retainer is successful according to the electric angle of the brake motor and the change condition of the clamping force of the brake caliper. And according to the change condition of the working data of the brake motor and the position data of the piston, diagnosing whether the release operation of the brake retainer is successful or not, realizing the diagnosis of two states of auxiliary parking braking of service braking, and improving the reliability of the diagnosis result and the safety of the vehicle.

Inventors

LI GUANGYA
ZHANG XUE
HUANG MEIPENG

Assignees

耐世特汽车系统（苏州）有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. The state diagnosis method of the auxiliary parking brake of the service brake is characterized by being applied to an electromechanical brake system; The electromechanical braking system comprises a braking motor, a transmission mechanism, a braking clamp, a braking disc, a braking retainer and a state monitoring module; the rotating shaft of the brake motor is connected with the brake caliper through the transmission mechanism, and the brake motor is used for providing power for the clamping action of the brake caliper on the brake disc; The brake retainer is arranged on the brake motor or the transmission mechanism and is used for locking a rotating shaft of the brake motor or the transmission mechanism after the brake caliper applies clamping force to the brake disc so as to maintain the clamping action of the brake caliper to the brake disc; the state monitoring module is used for monitoring state parameters of other devices and mechanisms; the state diagnosis method of the service brake auxiliary parking brake comprises the following steps: Monitoring an electrical angle of the brake motor and a clamping force of the brake caliper after the brake retainer completes a locking operation and the brake motor torque drops to 0; and diagnosing whether the locking operation of the brake retainer is successful according to the electric angle of the brake motor and the change condition of the clamping force of the brake caliper.
2. The method for diagnosing a state of a service brake auxiliary parking brake according to claim 1, wherein diagnosing whether the locking operation of the brake retainer is successful based on the electric angle of the brake motor and the change in the clamping force of the caliper comprises: judging whether the electric angle backspacing amount of the brake motor and the clamping force backspacing amount of the brake caliper do not exceed the corresponding backspacing amount threshold; Determining that the locking operation of the brake retainer is successful when the electrical angular back-off of the brake motor and the clamping force back-off of the brake caliper do not exceed their corresponding back-off thresholds; And determining that the locking operation of the brake retainer fails in the event that at least one of the electrical angular back-off of the brake motor and the clamping force back-off of the brake caliper exceeds its corresponding back-off threshold.
3. The method for diagnosing a state of a service brake auxiliary parking brake according to claim 1, wherein the transmission mechanism comprises a piston cylinder, a piston on the piston cylinder is connected with the brake caliper, and the piston is used for driving the brake caliper to perform clamping action and releasing action; The brake motor is also used for providing power for the brake caliper to execute the release action on the brake disc; the brake retainer is further configured to perform a release operation on the rotating shaft of the brake motor or the transmission mechanism before the brake caliper withdraws its clamping force applied to the brake disc, so that the brake caliper can perform the release action; The service brake auxiliary parking brake state diagnosis method further comprises the following steps: Monitoring work related data of the brake motor and position information of the piston after the brake retainer finishes the release operation and in the process of executing position control by the brake motor; and diagnosing whether the release operation of the brake retainer is successful or not according to the change conditions of the work data of the brake motor and the position data of the piston.
4. A service brake assisted park brake condition diagnosing method according to claim 3, wherein the work data of the brake motor comprises load current; Diagnosing whether the brake retainer release operation is successful or not according to the change condition of the work data of the brake motor and the position data of the piston, comprising: Judging whether the position information of the piston is subjected to preset change or not under the condition that the load current of the brake motor exceeds a corresponding current threshold value; Under the condition that the position information of the piston is changed in a preset manner, determining that the release operation of the brake retainer is successful; and determining that the release operation of the brake retainer fails in the case that the position information of the piston does not have a preset change.
5. A service brake assisted park brake condition diagnostic method according to claim 3 wherein the work data of the brake motor comprises motor torque; Diagnosing whether the brake retainer release operation is successful or not according to the change condition of the work data of the brake motor and the position data of the piston, comprising: Judging whether the position information of the piston is subjected to preset change or not under the condition that the motor torque of the brake motor exceeds a corresponding torque threshold value; Under the condition that the position information of the piston is changed in a preset manner, determining that the release operation of the brake retainer is successful; and determining that the release operation of the brake retainer fails in the case that the position information of the piston does not have a preset change.
6. The method according to claim 5, wherein the torque threshold is set based on a rated output power of the brake motor and a gear ratio of the transmission.
7. The method of claim 5, wherein the predetermined change comprises retracting the piston from a braking position to an initial position.
8. An electromechanical brake system is characterized by comprising a brake motor, a transmission mechanism, a brake caliper, a brake disc, a brake retainer, a state monitoring module and a control module; The rotating shaft of the brake motor is connected with the brake calipers through the transmission mechanism, and the brake motor is used for providing power for the clamping action of the brake calipers on the brake disc; The brake retainer is arranged on the brake motor or the transmission mechanism and is used for locking a rotating shaft of the brake motor or the transmission mechanism after the brake caliper applies clamping force to the brake disc so as to maintain the clamping action of the brake caliper to the brake disc; the state monitoring module is used for monitoring state parameters of other devices and mechanisms; the control module is configured to perform the service brake assisted park brake condition diagnostic method of any of claims 1-7.
9. The electromechanical brake system according to claim 8, wherein the transmission mechanism includes a piston cylinder, a piston on the piston cylinder being connected to the caliper, the piston being adapted to actuate the caliper in a clamping action and a release action; The brake motor is also used for providing power for the brake caliper to execute the release action on the brake disc; The brake retainer is also used to perform a release operation on the spindle of the brake motor or on the transmission before the brake caliper withdraws its clamping force applied to the brake disc, so that the brake caliper can perform the release action.
10. An automobile comprising an electromechanical braking system according to claim 8 or 9.

Description

Automobile, braking system and state diagnosis method for auxiliary parking braking of service braking Technical Field The invention relates to the field of automobile manufacturing, in particular to an automobile, a braking system and a state diagnosis method of service braking auxiliary parking braking. Background In recent years, with the progress of technology, the automobile industry is also coming into a new situation of vigorous development. As one of the emerging braking technologies, the electromechanical braking system has various non-negligible advantages such as fast braking response, high stability, high energy recovery efficiency, and the like, and is also becoming a focus of attention and deep research for various large-vehicle enterprises and research centers. The existing electromechanical brake system adopts an auxiliary brake device locking mode to enable a brake caliper to keep and release clamping actions after braking operation is completed, and parking clamping or releasing is achieved. Whether this parking function is successfully completed is determined according to the operating state of the auxiliary brake device. However, such a judging manner can only judge whether the auxiliary braking device completes the preset action, whether the actual parking effect is achieved, and still cannot complete the reliable diagnosis, which results in lower parking reliability of the electromechanical braking system. Disclosure of Invention The invention provides an automobile, a braking system and a state diagnosis method of a service braking auxiliary parking brake, which are used for improving the safety and parking stability of the automobile. According to an aspect of the present invention, there is provided a method of diagnosing a state of a service brake-assisted parking brake, the method being applied to an electro-mechanical brake system; the state diagnosis method of the service brake auxiliary parking brake comprises the following steps: Monitoring an electrical angle of the brake motor and a clamping force of the brake caliper after the brake retainer completes a locking operation and the brake motor torque drops to 0; and diagnosing whether the locking operation of the brake retainer is successful according to the electric angle of the brake motor and the change condition of the clamping force of the brake caliper. Optionally, diagnosing whether the locking operation of the brake retainer is successful according to the electrical angle of the brake motor and the change of the clamping force of the brake caliper, including: judging whether the electric angle backspacing amount of the brake motor and the clamping force backspacing amount of the brake caliper do not exceed the corresponding backspacing amount threshold; Determining that the locking operation of the brake retainer is successful when the electrical angular back-off of the brake motor and the clamping force back-off of the brake caliper do not exceed their corresponding back-off thresholds; And determining that the locking operation of the brake retainer fails in the event that at least one of the electrical angular back-off of the brake motor and the clamping force back-off of the brake caliper exceeds its corresponding back-off threshold. Optionally, the method for diagnosing the state of the service brake auxiliary parking brake further comprises the following steps: Monitoring work related data of the brake motor and position information of the piston after the brake retainer finishes the release operation and in the process of executing position control by the brake motor; and diagnosing whether the release operation of the brake retainer is successful or not according to the change conditions of the work data of the brake motor and the position data of the piston. Optionally, the work data of the brake motor includes load current; Diagnosing whether the brake retainer release operation is successful or not according to the change condition of the work data of the brake motor and the position data of the piston, comprising: Judging whether the position information of the piston is subjected to preset change or not under the condition that the load current of the brake motor exceeds a corresponding current threshold value; Under the condition that the position information of the piston is changed in a preset manner, determining that the release operation of the brake retainer is successful; and determining that the release operation of the brake retainer fails in the case that the position information of the piston does not have a preset change. Optionally, the work data of the brake motor comprises motor torque; Diagnosing whether the brake retainer release operation is successful or not according to the change condition of the work data of the brake motor and the position data of the piston, comprising: Judging whether the position information of the piston is subjected to preset change or not under the condition th