CN-121989880-A - Control system and control method for electronic parking brake and vehicle

CN121989880ACN 121989880 ACN121989880 ACN 121989880ACN-121989880-A

Abstract

The application relates to the technical field of vehicle braking, in particular to a control system and a control method for electronic parking braking and a vehicle. The control system comprises a brake system controller, a first parking device and a second parking device, a first communication network section and a second communication network section which are independent of each other, a vehicle body domain controller and the brake system controller are simultaneously connected to the first communication network section and the second communication network section, the first parking device and the second parking device are respectively used for generating a parking request signal and are respectively connected to the first communication network section and the second communication network section, the brake system controller receives the parking request signal from at least one of the first parking device and the second parking device through at least one of the first communication network section and the second communication network section, and the electronic caliper actuators on two sides are controlled to execute parking braking actions in response to the parking request signal. Compared with a single communication network in the related art, the stability and the safety of electronic parking are improved.

Inventors

ZENG BO
DU XIAOQUAN

Assignees

重庆长安汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The control system for the electronic parking brake is characterized by comprising a brake system controller, a first electronic caliper actuator, a second electronic caliper actuator, a first parking device, a second parking device, a first communication network segment, a second communication network segment and a vehicle body domain controller; The first communication network section and the second communication network section are mutually independent; The vehicle body domain controller is used as a gateway and is accessed into the first communication network section and the second communication network section simultaneously; The first parking device is used for generating a first parking request signal and accessing a first communication network segment; The second parking device is used for generating a second parking request signal and accessing a second communication network segment; The brake system controller is connected to the first communication network section and the second communication network section simultaneously, and is configured to receive a parking request signal from at least one of the first parking device and the second parking device through at least one of the first communication network section and the second communication network section, acquire environment working condition information in response to the parking request signal, determine target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator according to the environment working condition information, and control the first electronic caliper actuator and/or the second electronic caliper actuator to execute parking braking action according to the target clamping force.
2. The control system according to claim 1, wherein the first parking device includes: the electronic P gear button is used for inputting the parking intention of a driver; the electronic P gear button is connected with the electronic gear shifting controller through a hard wire, and the electronic gear shifting controller is connected to the first communication network section; The brake system controller is further configured to respond to a hard wire parking release signal sent by the electronic P-gear key when detecting a communication fault of the whole vehicle CAN bus, judge whether a master cylinder pressure signal of the brake system meets a parking release condition or not, and control the first electronic caliper actuator and/or the second electronic caliper actuator to execute a parking release action under the condition that the master cylinder pressure signal meets the parking release condition.
3. The control system according to claim 1, wherein the second parking device includes: the vehicle-mounted information terminal is integrated with an electronic parking soft switch and is connected to the second communication network section; The electronic parking soft switch is used for inputting the parking intention of a driver.
4. The control system of claim 1, wherein the brake system controller comprises a first drive circuit and a second drive circuit disposed independently of each other, the first drive circuit for driving the first electronic caliper actuator, the second drive circuit for driving the second electronic caliper actuator, and/or The control system further comprises a transmission controller which is connected with the first communication network section and the second communication network section simultaneously, wherein the transmission controller is configured to receive clamping state signals of the first electronic caliper actuator and the second electronic caliper actuator fed back by the brake system controller, and based on any one of the received clamping state signals of the first electronic caliper actuator and the second electronic caliper actuator, a P-gear valid signal is generated and sent to the first communication network section and/or the second communication network section, and the vehicle is controlled to be powered down.
5. A control method for an electronic parking brake, characterized by being applied to the control system for an electronic parking brake as claimed in any one of claims 1 to 4, the control method comprising: generating a parking request signal by the first parking device or the second parking device; The brake system controller receives a parking request signal from at least one of the first parking device and the second parking device through at least one of the first communication network segment and the second communication network segment; Responding to the parking request signal, and acquiring environment working condition information; Determining target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator according to the environmental working condition information; And controlling the first electronic caliper actuator and/or the second electronic caliper actuator to execute the parking brake action according to the target clamping force.
6. The control method of claim 5, wherein the environmental condition information includes grade information, and determining the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator based on the environmental condition information includes: determining a target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator as a first clamping force under the condition that the gradient information is smaller than or equal to a first gradient threshold value; Determining that the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator is the second clamping force under the condition that the gradient information is larger than the first gradient threshold value and smaller than or equal to the second gradient threshold value; Determining that the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator is a third clamping force under the condition that the gradient information is larger than the second gradient threshold value; Wherein the first clamping force is less than the second clamping force, and the second clamping force is less than the third clamping force.
7. The control method according to claim 6, wherein the environmental condition information further includes road surface type information including a low adhesion road surface, a medium adhesion road surface, and a high adhesion path, and determining the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator based on the environmental condition information includes: Under the condition that the road surface type information is a medium-high adhesion road surface type, determining target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator according to gradient information; Determining that the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator is the product of the first clamping force and a first preset coefficient under the condition that the road surface type information is of a low-adhesion road surface type and the gradient information is smaller than or equal to a first gradient threshold value; determining that the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator is the product of the second clamping force and the second pre-coefficient under the condition that the road surface type information is a low-adhesion road surface type and the gradient information is greater than the first gradient threshold value and smaller than or equal to the second gradient threshold value; Determining that the target clamping force of the first electronic caliper actuator and/or the second electronic caliper actuator is the product of the third clamping force and the third pre-coefficient under the condition that the road surface type information is of a low-adhesion road surface type and the gradient information is larger than the second gradient threshold value; The first preset coefficient is smaller than the second preset coefficient, the second preset coefficient is smaller than the third preset coefficient, and the first preset coefficient is larger than 1.
8. The control method according to claim 7, further comprising the body area controller monitoring a communication state of the first communication network segment and the second communication network segment, the brake system controller receiving a parking request signal from at least one of the first parking device and the second parking device through at least one of the first communication network segment and the second communication network segment, comprising: when the communication of the first communication network segment is normal, the brake system controller receives a parking request signal from the first parking device through the first communication network segment; When the second communication network segment is normal in communication, the brake system controller receives a parking request signal from the second parking device through the second communication network segment; When the first communication network segment is in communication failure and the second communication network segment is in communication normal, the vehicle body domain controller routes a parking request signal from the second parking device to the brake system controller in the second communication network segment; When the second communication network segment is in communication failure and the first communication network segment is in communication normal, the vehicle body domain controller routes a parking request signal from the first parking device to the brake system controller within the first communication network segment.
9. The control method of claim 7, wherein the electronic P-range button is further connected to the brake system controller by a hard wire, the control method further comprising: when the communication fault of the CAN bus of the whole vehicle is detected, responding to a hard wire parking release signal sent by an electronic P-gear button, and judging whether a master cylinder pressure signal of a brake system meets a parking release condition; And controlling the first electronic caliper actuator and/or the second electronic caliper actuator to execute the parking release action under the condition that the master cylinder pressure signal meets the parking release condition.
10. A vehicle, characterized by comprising: a vehicle body; The control system for electronic parking brake according to any one of claims 1 to 4, mounted to a vehicle body.

Description

Control system and control method for electronic parking brake and vehicle Technical Field The application relates to the technical field of vehicle braking, in particular to a control system and a control method for electronic parking braking and a vehicle. Background With the continuous improvement of the electronic and intelligent degree of automobiles, the electronic parking brake system is widely applied to various vehicles due to the advantages of convenience in operation, high integration level and the like. In the related art, in order to improve the reliability of an electronic parking brake system, an automobile parking system with a redundant backup function is provided, and the scheme comprises a vehicle speed acquisition module, a gradient acquisition module, a P gear module, a first parking actuator and a second parking actuator which are mutually independent, and a first control module and a second control module which are mutually independent. The first control module is electrically connected with the vehicle CAN bus, the vehicle speed acquisition module, the gradient acquisition module, the P-gear module and the first parking actuator respectively, the second control module is electrically connected with the vehicle CAN bus, the vehicle speed acquisition module, the gradient acquisition module, the P-gear module and the second parking actuator respectively, and the first control module is communicated with the second control module. According to the scheme, redundant backup for the parking control module is realized by setting the double controllers, the double actuators and the external hard wire input backup. In carrying out the above embodiments, it was found that at least the following problems exist: In the above embodiment, redundant backup for the parking control module is achieved through the first control module, the second control module, the first parking actuator, the second parking actuator and the like, but nodes such as the first control module, the second control module, the first parking actuator and the second parking actuator are all connected to the same set of vehicle CAN bus in a hanging manner to perform signal interaction. And, its parking instruction's input adopts single P to keep off the module only. Therefore, when the communication bus is in fault, even if hardware such as the first control module, the second control module, the first parking actuator, the second parking actuator and the like are all intact, the system can completely lose the transmission capability of control instructions and state information, and the vehicle is at a safety risk that electronic parking cannot be realized. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a control system, a control method and a vehicle for electronic parking brake, so as to solve the technical problem that electronic parking cannot be realized due to communication interruption. In some embodiments, a control system for an electronic parking brake is provided, comprising a brake system controller, a first electronic caliper actuator, a second electronic caliper actuator, a first parking device, a second parking device, a first communication network segment, a second communication network segment and a vehicle body domain controller, wherein the first communication network segment and the second communication network segment are arranged independently of each other, the vehicle body domain controller is used as a gateway and is connected with the first communication network segment and the second communication network segment simultaneously, the first parking device is used for generating a first parking request signal and is connected with the first communication network segment, the second parking device is used for generating a second parking request signal and is connected with the second communication network segment simultaneously, the brake system controller is connected with the first communication network segment and the second communication network segment simultaneously, the brake system controller is configured to receive parking request signals from at least one of the first communication network segment and the second communication network segment, respond to parking request signals, acquire environment condition information, determine a target clamping forc