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EP-4480768-B1 - COMFORT BRAKE CONTROL SYSTEM AND CONTROL METHOD

EP4480768B1EP 4480768 B1EP4480768 B1EP 4480768B1EP-4480768-B1

Inventors

  • HUANG, CHONGXI
  • Wang, Renrui
  • ZHANG, YING

Dates

Publication Date
20260513
Application Date
20230622

Claims (12)

  1. A comfort brake control system (100) for a vehicle (V), comprising: a human-machine interaction interface (HMI 10), configured to provide an interface of multiple optional comfort brake levels of the vehicle (V), and receive selection of one of the multiple comfort brake levels to switch a current comfort brake level of the vehicle (V), wherein each comfort brake level comprises a brake parameter corresponding to the comfort brake level, and the brake parameter comprises at least brake pressure and/or a brake pressure change rate of at least one brake cylinder of the vehicle (V); characterised by a comfort brake module (20), configured to determine whether a current state of the vehicle (V) meets a predetermined switching condition; and when it is determined that the switching condition is met, obtain a brake parameter corresponding to a selected comfort brake level, and transmit the obtained brake parameter to a brake system of the vehicle by using a vehicle bus of the vehicle (V).
  2. The comfort brake control system (100) according to claim 1, wherein the predetermined switching condition is one of: the vehicle (V) is in a stationary state; and a duration away from the moment at which the vehicle (V) starts braking is greater than a predetermined duration, and the predetermined duration is associated with a duration required for transmitting the brake parameter to the brake system by using the vehicle bus.
  3. The comfort brake control system (100) according to claim 1 or 2, wherein the comfort brake module (20) stores an expected vehicle speed in a braking process of the vehicle (V); and the comfort brake module (20) is further configured to: obtain an actual vehicle speed of the vehicle in the braking process; calculate a speed difference between the actual vehicle speed and the expected vehicle speed; and adjust brake pressure in the brake parameter based on the calculated speed difference to reduce the speed difference.
  4. The comfort brake control system (100) according to claim 3, wherein the calculating the vehicle speed difference comprises: calculating a vehicle speed difference between an actual vehicle speed and a corresponding expected vehicle speed at a predetermined moment after a predetermined duration passes since braking starts; and adjusting the brake pressure comprises: if the vehicle speed difference at the predetermined moment is positive, and exceeds a first vehicle speed difference threshold, increasing the brake pressure; and if the vehicle speed difference at the predetermined moment is negative, and exceeds a second vehicle speed difference threshold, reducing the brake pressure.
  5. The comfort brake system (100) according to claim 4, wherein increasing the brake pressure comprises: increasing the brake pressure by a first increment unit or a second increment unit greater than the first increment unit; and reducing the brake pressure comprises: reducing the brake pressure by using a first decrement unit or a second decrement unit greater than the first decrement unit.
  6. The comfort brake control system (100) according to any one of claims 3 to 5, wherein: adjusting the brake pressure comprises: adjusting the brake pressure one time or multiple times; and in the case of multiple times of adjustment, re-obtaining the actual vehicle speed after each time of adjustment, calculating a new vehicle speed difference, and adjusting the brake pressure based on the new vehicle speed difference.
  7. The comfort brake control system (100) according to any one of claims 3 to 6, wherein the comfort brake module (20) is further configured to: calculate a ratio of the vehicle speed difference to the expected vehicle speed; divide the entire braking process into multiple sections; set a ratio threshold for a ratio of each section; and for each section, calculate a difference between the ratio of the section and the ratio threshold of the section, and adjust the brake pressure change rate in the brake parameter based on the difference.
  8. The comfort brake system (100) according to claim 7, wherein adjusting the brake pressure change rate comprises: determining a quantity of sections with positive differences and a quantity of sections with negative differences; if the quantity of sections with positive differences is greater than the quantity of sections with negative differences, reducing the brake pressure change rate by a third decrement unit; and if the quantity of sections with positive differences is less than the quantity of sections with negative differences, increasing the brake pressure change rate by a third increment unit; wherein the third increment unit is less than the third decrement unit.
  9. The comfort brake control system (100) according to claim 7 or 8, wherein setting the ratio threshold for each section comprises: setting a larger ratio threshold for a section with a lower vehicle speed.
  10. The comfort brake control system (100) according to any one of claims 1 to 9, wherein: the human-machine interaction interface (HMI 10) is further configured to: after the vehicle (V) is initialized, provide, for a user of the vehicle (V), information indicating that the vehicle (V) has a comfort brake function and has the multiple comfort brake levels; and the comfort brake module (20) is further configured to be activated in response to the user selecting the comfort brake function; wherein the initialization comprises at least one of the following: activating or updating a functional unit of a new vehicle during delivery of the vehicle (V); and activating or updating the functional unit during factory reset.
  11. The comfort brake control system (100) according to any one of claims 1 to 10, wherein the comfort brake control system is disposed in the vehicle (V); the human-machine interaction interface (HMI 10) comprises at least one of the following: a voice interaction interface, a touchscreen, and a physical button; and the comfort brake module (20) is disposed in a control unit of the brake system of the vehicle (V) or disposed in a domain controller of the vehicle (V).
  12. A comfort brake control method for a vehicle (V), optionally performed by the comfort brake control system according to any one of claims 1 to 11, the method comprising: providing an interface of multiple optional comfort brake levels of the vehicle (V); receiving selection of one of the multiple comfort brake levels to switch a current comfort brake level of the vehicle (V), wherein each comfort brake level comprises a brake parameter corresponding to the comfort brake level, and the brake parameter comprises at least brake pressure and/or a brake pressure change rate of at least one brake cylinder of the vehicle (V); characterised by determining whether a current state of the vehicle (V) meets a predetermined switching condition; when it is determined that the switching condition is met, obtaining a brake parameter corresponding to a selected comfort brake level; and transmitting the obtained brake parameter to a brake system of the vehicle (V) by using a vehicle bus of the vehicle.

Description

TECHNICAL FIELD This invention relates to the field of vehicle braking technologies, and in particular, to a comfort brake control system and a comfort brake control method for a vehicle. BACKGROUND Recently, research on braking technologies for self-driving vehicles has been very active. The primary focus of the research is on safety and brake efficiency, with relatively little research on user experience. User experience of a self-driving vehicle directly affects user acceptance and trust in the self-driving vehicle, and further affects popularization of the self-driving vehicle. In an existing brake control solution for a self-driving vehicle, there is no optimal solution for setting a brake policy according to a user requirement. In addition, in the existing brake control solution for a self-driving vehicle, a case in which an actual braking process of the self-driving vehicle deviates from an expected braking process cannot be detected in a timely manner, and therefore, cannot be adjusted in a timely manner. US 2015/100190 A1 discloses a vehicle braking mechanism for autonomous operation of the braking mechanism. A first parameter is retrieved for governing control of the braking mechanism and the first parameter is applied to operation of the braking mechanism, and a second parameter is determined for governing control of the braking mechanism. SUMMARY In this context, the present disclosure aims to provide a comfort brake control solution for a vehicle, which can implement braking comfort that meets a user requirement. According to an aspect of the present disclosure, a comfort brake control system for a vehicle is provided, including: a human-machine interaction interface, configured to provide an interface of multiple optional comfort brake levels of the vehicle, and receive selection of one of the multiple comfort brake levels to switch a current comfort brake level of the vehicle, wherein each comfort brake level comprises a brake parameter corresponding to the comfort brake level, and the brake parameter comprises at least brake pressure and/or a brake pressure change rate of at least one brake cylinder of the vehicle; and a comfort brake module, configured to determine whether a current state of the vehicle meets a predetermined switching condition; and when it is determined that the switching condition is met, obtain a brake parameter corresponding to a selected comfort brake level, and transmit the obtained brake parameter to a brake system of the vehicle by using a vehicle bus of the vehicle. According to another aspect of the present disclosure, a comfort brake control method for a vehicle is provided, where optionally, the method is performed by the foregoing comfort brake control system, and the method includes: providing an interface of multiple optional comfort brake levels of the vehicle, and receiving selection of one of the multiple comfort brake levels to switch a current comfort brake level of the vehicle, wherein each comfort brake level comprises a brake parameter corresponding to the comfort brake level, and the brake parameter comprises at least brake pressure and/or a brake pressure change rate of at least one brake cylinder of the vehicle; determining whether a current state of the vehicle meets a predetermined switching condition; when it is determined that the switching condition is met, obtaining a brake parameter corresponding to a selected comfort brake level; and transmitting the obtained brake parameter to a brake system of the vehicle by using a vehicle bus of the vehicle. The above gives an overview of the main aspects of the present disclosure in order to allow for a basic understanding of these aspects. This overview is not intended to describe key or important elements of any aspect of the present disclosure, nor is it intended to limit the scope of any or all aspects of the present disclosure. The purpose of this overview is to provide some implementations of these aspects in a simplified form as a preamble to the detailed description given later. BRIEF DESCRIPTION OF DRAWINGS The technical solutions of the present disclosure are clearer from the following detailed description with reference to the accompanying drawings. It may be understood that these accompanying drawings are merely used for illustration purposes, but are not intended to limit the protection scope of the present disclosure. FIG. 1 is a schematic diagram of a comfort brake control system for a vehicle according to an embodiment of the present disclosure.FIG. 2 is a schematic diagram of a comfort brake level according to an embodiment of the present disclosure.FIG. 3 is a flowchart of a comfort brake control process according to an embodiment of the present disclosure.FIG. 4 is a flowchart of a comfort brake control process according to another embodiment of the present disclosure.FIG. 5 is a flowchart of a comfort brake control process according to still another embodiment of the present disclos