Brake system for a vehicle and method for braking

Patent metadata

Field	Value
Publication number	US-12485859-B2
Application number	US-202318113504-A
Country	US
Kind code	B2
Filing date	Feb 23, 2023
Priority date	Aug 24, 2020
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

The present invention relates to a brake system for a vehicle and a method for braking. The brake system includes a control module and an electromechanical brake that provides braking force to a wheel. The control module receives rotation speed information of at least one drive motor, which provides a driving torque to the vehicle, and wheel speed sensor information of at least one wheel, and compares the refresh rate of the rotation speed information of the drive motor and that of the wheel speed sensor information of the wheel, such that a wheel rotational speed generated from the information of a higher refresh rate will be used. The brake system provided by the present invention can obtain a more accurate wheel speed, thereby improving the control of the vehicle.

First claim

We claim:

1 . A brake system for a vehicle, comprising:
a control module and an electromechanical brake providing braking force to a wheel, wherein the control module receives rotation speed information of at least one drive motor, which provides a driving torque to the vehicle, and wheel speed sensor information of at least one wheel; compares a refresh rate of the rotation speed information of the drive motor and a refresh rate of the wheel speed sensor information of the wheel; and generates a wheel rotational speed by use of the information of a higher refresh rate.

2 . The brake system according to claim 1 , wherein the control module is configured such that, when the wheel rotational speed generated from the rotation speed information of the drive motor or that generated from the wheel speed sensor information of the wheel is used, the control module will use the wheel rotational speed generated from the other of the drive motor or the wheel for validation.

3 . The brake system according to claim 2 , wherein the wheel rotational speed generated from the wheel speed sensor information will always be used when a deviation of the wheel rotational speed generated from the rotation speed information of the drive motor from that generated from the wheel speed sensor information of the wheel is larger than a preset value.

4 . The brake system according to claim 2 , wherein the control module is configured such that in a case when the refresh rate of the wheel speed sensor information is higher than that of the rotation speed information of the drive motor, a deviation of the wheel rotational speed generated from the wheel speed sensor information from the wheel rotational speed generated from the rotation speed information of the drive motor is smaller than a preset value, when the refresh rate of the wheel speed sensor information is lower than that of the rotation speed information of the drive motor, it will use the wheel rotational speed generated from the rotation speed information of the drive motor.

5 . The brake system according to claim 3 , wherein the control module is configured such that in the case when the refresh rate of the wheel speed sensor information is higher than that of the rotation speed information of the drive motor, the deviation of the wheel rotational speed generated from the wheel speed sensor information from the wheel rotational speed generated from the rotation speed information of the drive motor is smaller than a preset value, when the refresh rate of the wheel speed sensor information is lower than that of the rotation speed information of the drive motor, it will use the wheel rotational speed generated from the rotation speed information of the drive motor.

6 . The brake system according to claim 2 , wherein the drive motor drives a pair of drive wheels through a differential, and the control module is configured such that when the wheel speed sensor information of one drive wheel of the pair of drive wheels is missed, the rotational speed of the drive wheel will be speculated based on the rotation speed information of the drive motor and the wheel speed sensor information of the other drive wheel.

7 . The brake system according to claim 2 , wherein the at least one drive motor is at least one pair of drive motors, and wherein a pair of drive wheels of the vehicle are driven independently from each other.

8 . The brake system according to claim 7 , wherein the control module is configured to generate the rotational speed of the drive wheels according to the rotation speed information of the drive motors and the information of a driving torque transmission mechanism between the drive motors and the drive wheels.

9 . The brake system according to claim 7 , wherein the control module is configured such that when the wheel speed sensor information of one drive wheel is missed, it will use the rotational speed of the drive wheel generated from the rotation speed information of the respective drive motor.

10 . The brake system according to claim 2 , wherein the control module comprises a redundant drive motor control unit which can at least partly achieve the control of the motor drive.

11 . The brake system according to claim 2 , wherein the brake system comprises two control modules, each of which constitutes a brake circuit with at least one pair of electromechanical brakes.

12 . A method for braking a vehicle, a brake system of the vehicle comprises a control module and an electromechanical brake providing braking force to a wheel, wherein the control module receives rotation speed information of at least one drive motor, which provides a driving torque to the vehicle, and wheel speed sensor information of at least one wheel, the method comprising:
comparing a refresh rate of the rotation speed information of the drive motor and a refresh rate of the wheel speed sensor information of the wheel; and generating a rotational speed of the wheel from the one of a higher refresh rate from the rotation speed information of the drive motor and the wheel speed sensor information of the wheel.

13 . The method for braking a vehicle according to claim 12 , the method further comprising:
validating with a wheel rotational speed of the wheel generated from the rotation speed information of the drive motor and the wheel speed sensor information of the wheel.

14 . The method for braking a vehicle according to claim 13 , the method further comprising:
calculating a deviation of the wheel rotational speed generated from the rotation speed information of the drive motor from that generated from the wheel speed sensor information of the wheel; always using the wheel rotational speed generated from the wheel speed sensor information of the wheel when the deviation is larger than a preset value.

15 . The method for braking a vehicle according to claim 13 , the method further comprising:
in a case when the refresh rate of the wheel speed sensor information is higher than that of the rotation speed information of the drive motor, the deviation of the wheel rotational speed generated from the wheel speed sensor information from the wheel rotational speed generated from the rotation speed information of the drive motor is smaller than a preset value, using the wheel rotational speed generated from the rotation speed information of the drive motor, when the refresh rate of the wheel speed sensor information is lower than that of the rotation speed information of the drive motor.

16 . The method for braking a vehicle according to claim 14 , the method further comprising:
in a case when the refresh rate of the wheel speed sensor information is higher than that of the rotation speed information of the drive motor, the deviation of the wheel rotational speed generated from the wheel speed sensor information from the wheel rotational speed generated from the rotation speed information of the drive motor is smaller than a preset value, using the wheel rotational speed generated from the rotation speed information of the drive motor, when the refresh rate of the wheel speed sensor information is lower than that of the rotation speed information of the drive motor.

17 . The method for braking a vehicle according to claim 13 , wherein the drive motor drives a pair of drive wheels through a differential, the method further comprising:
speculating the wheel rotational speed of a drive wheel based on the rotation speed information of the drive motor and the wheel speed sensor information of the other drive wheel, when the wheel speed sensor informa

Assignees

• Haldex Brake Prod Ab
• Haldex Ab

Inventors

• Nilsson Anders
• Lindqvist Anders

Classifications

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title

• B60T2270/402

  Back-up · CPC title

• B60T2270/416

  Wheel speed sensor failure · CPC title

• B60T2240/00

  Monitoring, detecting wheel/tyre behaviour; counteracting thereof · CPC title

• B60T8/885

  using electrical circuitry · CPC title