CN-121989895-A - Electromechanical braking system and electric vehicle

Abstract

The application provides an electronic mechanical braking system and an electric vehicle, and relates to the technical field of electric automobiles. In the braking process of the electric vehicle, the central controller is used for alternately sending different first message information to each wheel end braking device through two CAN communication links, and a plurality of different first message information jointly form a braking signal, so that the central controller CAN directly send the first message information through other CAN communication links without waiting for sending the next first message information after a time interval of sending the first message information through one CAN communication link after sending the first message information through the other CAN communication link, the original sending period of the first message information is optimized for sending the time interval between the first message information through the two CAN communication links, the communication delay of the braking signal transmission is reduced, the response speed of a braking system is improved, the braking time and the braking distance are reduced, and the driving safety is ensured.

Inventors

• MAO JIAN
• Dai Xianlang
• WANG YOU
• SUN MINGJUN
• XU YUE

Assignees

• 华为技术有限公司

Dates

Publication Date

20260508

Application Date

20260211

Claims (15)

1. 1. An electromechanical brake system comprising a central controller and four wheel end brake devices, the central controller being configured to output brake signals to the four wheel end brake devices to control the four wheel end brake devices to brake four wheels of an electric vehicle, respectively, the central controller being configured to transmit the brake signals to each of the wheel end brake devices over two CAN communication links, wherein: In the braking process of the electric vehicle, the central controller is used for alternately sending different first message information to each wheel end braking device through the two CAN communication links, the braking signals are formed by the different first message information together, and each wheel end braking device is used for receiving the different message information and outputting braking force to the corresponding wheel according to the different message information.
2. 2. The electro-mechanical brake system of claim 1, wherein the central controller is configured to transmit a first message over a CAN communication link at a point in time.
3. 3. The electro-mechanical brake system of claim 1, wherein the two CAN communication links comprise a first CAN communication link and a second CAN communication link; the time interval between the central controller sending the first message information through the first CAN communication link and the central controller sending the first message information through the second CAN communication link is smaller than the sending period of the first message information.
4. 4. The electro-mechanical brake system of claim 1, wherein the two CAN communication links comprise a first CAN communication link and a second CAN communication link; The sending period of the first message information is an integral multiple of the time interval between the central controller sending the first message information through the first CAN communication link and the central controller sending the first message information through the second CAN communication link.
5. 5. The electro-mechanical brake system of claim 4, wherein the period of transmission of the first message information is 2 times the time interval between the central controller transmitting the first message information over the first CAN communication link and the central controller transmitting the first message information over the second CAN communication link.
6. 6. The electro-mechanical brake system of claim 1, wherein the alternate messaging mode is detected to have been turned on before the central controller is configured to alternate messaging of a different first message to each of the wheel end brake devices via the two CAN communication links.
7. 7. The electro-mechanical brake system of claim 6, wherein said central controller is configured to transmit a first message to each of said wheel end brake devices via at least one of said two CAN communication links prior to said alternate message transmission mode being on.
8. 8. The electro-mechanical brake system of claim 1, wherein the central controller is configured to send a first message signal to each of the wheel end brake devices over the two CAN communication links in the event of a failure of at least one of the two CAN communication links.
9. 9. The electro-mechanical brake system of claim 1, wherein each of said wheel end brake assemblies includes a wheel end controller and a wheel end actuator, each of said wheel end controllers for transmitting brake feedback signals to said central controller via two CAN communication links; And in the braking process of the electric vehicle, each wheel end controller is used for alternately sending different second message information to the central controller through the two CAN communication links, and the braking feedback signals are formed by the different second message information together.
10. 10. The electro-mechanical brake system of claim 9, wherein each of said wheel end controllers is configured to transmit a second message over a CAN communication link at a point in time.
11. 11. The electro-mechanical brake system of claim 9, wherein the two CAN communication links include a first CAN communication link and a second CAN communication link; and the time interval between each wheel end controller sending second message information through the first CAN communication link and the wheel end controller sending second message information through the second CAN communication link is smaller than the sending period of the second message information.
12. 12. The electro-mechanical brake system of claim 9, wherein the two CAN communication links include a first CAN communication link and a second CAN communication link; the sending period of the second message information is an integral multiple of the time interval between each wheel end controller sending the second message information through the first CAN communication link and the wheel end controller sending the second message information through the second CAN communication link.
13. 13. An electric vehicle comprising an electromechanical brake system and four wheels, the electromechanical brake system comprising a central controller and four wheel end brakes, the central controller being configured to output brake signals to the four wheel end brakes to control the four wheel end brakes to brake the four wheels respectively, the central controller being configured to transmit the brake signals to each of the wheel end brakes over two CAN communication links, wherein: In the braking process of the electric vehicle, the central controller is used for alternately sending different first message information to each wheel end braking device through the two CAN communication links, the braking signals are formed by the different first message information together, and each wheel end braking device is used for receiving the different message information and outputting braking force to the corresponding wheel according to the different message information.
14. 14. The electric vehicle of claim 13, characterized in that the two CAN communication links comprise a first CAN communication link and a second CAN communication link; the time interval between the central controller sending the first message information through the first CAN communication link and the central controller sending the first message information through the second CAN communication link is smaller than the sending period of the first message information.
15. 15. The electric vehicle of claim 13, characterized in that each of said wheel end brake devices comprises a wheel end controller and a wheel end actuator, each of said wheel end controllers being adapted to send brake feedback signals to said central controller via two CAN communication links; And in the braking process of the electric vehicle, each wheel end controller is used for alternately sending different second message information to the central controller through the two CAN communication links, and the braking feedback signals are formed by the different second message information together.

Description

Electromechanical braking system and electric vehicle Technical Field The present application relates to the technical field of electric automobiles, and more particularly, to an electromechanical brake system and an electric vehicle. Background An electric vehicle equipped with an electro-mechanical brake system (electronic mechanical brake, EMB) typically has a central controller in the electro-mechanical brake system that controls the wheel end brake devices to brake the electric vehicle in response to a driver operating a brake pedal to output a brake signal to the wheel end brake devices. However, in the braking process of the electric vehicle, the time required for transmitting the braking signal to the wheel end braking device is long, so that the communication time delay of the braking system is long, the braking time and the braking distance are long, and the driving safety is influenced. Disclosure of Invention The application provides an electromechanical braking system and an electric vehicle, wherein a central controller is used for alternately sending different message information to each wheel end braking device through a plurality of CAN communication links, so that the communication time delay of signal transmission is reduced, the response speed of the braking system is improved, and the braking time and the braking distance are reduced. In a first aspect, an embodiment of the present application provides an electromechanical brake system, the electromechanical brake system including a central controller and four wheel end brake devices, the central controller configured to output brake signals to the four wheel end brake devices to control the four wheel end brake devices to brake four wheels of an electric vehicle, respectively, the central controller configured to send the brake signals to each wheel end brake device through two CAN communication links, wherein: in the braking process of the electric vehicle, the central controller is used for alternately sending different first message information to each wheel end braking device through two CAN communication links, the braking signals are jointly formed by the different first message information, and each wheel end braking device is used for receiving the different first message information and outputting braking force to the corresponding wheel according to the different first message information. In this embodiment, during braking of an electric vehicle, the central controller is configured to alternately send different first message information to each wheel end braking device through two CAN communication links, and a plurality of different first message information together form a braking signal, so that after the first message information is sent through one CAN communication link, the central controller is enabled to send the next first message information without waiting for a time interval for sending the first message information through the CAN communication link, and CAN directly send the first message information through the other CAN communication link, so that the original sending period of the first message information is optimized for the time interval between the first message information sending through the two CAN communication links, the communication delay of the transmission of the braking signal is reduced, and then each wheel end braking device is configured to receive the different first message information and output a braking force to the corresponding wheel according to the different first message information, thereby improving the response speed of the braking system, reducing the braking time and the braking distance, and ensuring the riding safety. In one embodiment of the first aspect, the central controller is configured to transmit a first message over a CAN communication link at a point in time. In this embodiment, the central controller is configured to send one first message information through one CAN communication link at one time point, so that transmission periods of a plurality of different first message information are staggered, thereby implementing a speed of transmission of the first message information, and reducing a communication delay of brake signal transmission. In one embodiment of the first aspect, the two CAN communication links include a first CAN communication link and a second CAN communication link, and a time interval between the central controller transmitting the first message information over the first CAN communication link and the central controller transmitting the first message information over the second CAN communication link is less than a transmission period of the first message information. The sending period of the first message information refers to a sending period of the first message information sent through a CAN communication link. In the embodiment, the two CAN communication links comprise a first CAN communication link and a second CAN communication link