Rear wheel regenerative braking control system for vehicle and method therefor

Patent metadata

Field	Value
Publication number	US-11325573-B2
Application number	US-201715717674-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	Feb 24, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A rear wheel regenerative braking control system for vehicle, may include a brake controller; a vehicle controller; a hydraulic controller; and a motor controller, wherein the system and the method may maximize an amount of rear wheel regenerative braking while easily securing braking stability of a vehicle.

First claim

What is claimed is:

1. A rear wheel regenerative braking control system for a vehicle, the system comprising:
a brake controller; a vehicle controller; a hydraulic controller; and a motor controller,
wherein the brake controller is configured to determine and transmit an allowable rear-wheel regenerative braking performance value to the vehicle controller and to determine a target hydraulic braking performance value based on an actual rear-wheel regenerative braking performance value received from the vehicle controller and transmit the target hydraulic braking performance value to the hydraulic controller,
wherein the vehicle controller is configured to determine a rear-wheel regenerative braking performance command value based on the allowable rear-wheel regenerative braking performance value received from the brake controller and transmit the rear-wheel regenerative braking performance command value to the motor controller and to transmit the actual rear-wheel regenerative braking performance value received from the motor controller to the brake controller,
wherein the hydraulic controller is configured to apply a hydraulic braking force to a hydraulic brake based on the target hydraulic braking performance value received from the brake controller,
wherein the motor controller is configured to control a motor to generate a rear-wheel regenerative braking operation according to the rear-wheel regenerative braking performance command value received from the vehicle controller,
wherein the brake controller is configured to determine a wheel slip rate based on a detection signal from a wheel-speed detector and, when the wheel slip rate is maintained at a predetermined level for a predetermined time period, transmit a rear-wheel regenerative braking-interruption signal to the vehicle controller,
wherein the vehicle controller is configured to reset the rear-wheel regenerative braking performance command value according to the rear-wheel regenerative braking-interruption signal to a value smaller than a current rear-wheel regenerative braking performance value and transmit the reset value to the motor controller, and
wherein the motor controller controls a regenerative braking operation of the motor according to the actual rear-wheel regenerative braking performance value corresponding to the reset rear-wheel regenerative braking performance command value so that the rear-wheel regenerative braking operation is carried out thereby, preventing a rear wheel of the vehicle from being locked before a front wheel of the vehicle is locked or preventing spinning of the vehicle from occurring due to a locking of the rear wheel of the vehicle,
wherein when the rear wheel is locked, a rotation of the rear wheel is stopped and when the front wheel is locked, a rotation of the front wheel is stopped, and
wherein the rear-wheel regenerative braking performance command value according to the rear-wheel regenerative braking-interruption signal is reset, by the vehicle controller in response to the rear wheel regenerative braking interruption signal, to a value that decreases from the current rear-wheel regenerative braking performance value to zero.

2. The system according to claim 1 , wherein the brake controller is configured to determine a wheel-speed difference between the front wheel and the rear wheel, and when the wheel-speed difference is determined to be a predetermined level or more, transmit the rear-wheel regenerative braking-interruption signal to the vehicle controller.

3. The system according to claim 1 , wherein the brake controller is configured to receive a yaw rate-detection signal from a yaw rate detector, and when the yaw rate signal is determined to be a predetermined level or more, transmit a rear-wheel regenerative braking-interruption signal to the vehicle controller.

4. A rear wheel regenerative braking control method for a vehicle, the method comprising:
determining and transmitting, by a brake controller, an allowable rear-wheel regenerative braking performance value to a vehicle controller and determining a target hydraulic braking performance value based on an actual rear-wheel regenerative braking performance value received from the vehicle controller and transmitting the target hydraulic braking performance value to a hydraulic controller;
determining, by the vehicle controller, a rear-wheel regenerative braking performance command value based on the allowable rear-wheel regenerative braking performance value received from the brake controller and transmitting the rear-wheel regenerative braking performance command value to a motor controller, and transmitting the actual rear-wheel regenerative braking performance value received from the motor controller to the brake controller;
determining, by the hydraulic controller, a hydraulic braking force applied to a hydraulic brake based on the target hydraulic braking performance value received from the brake controller; and
controlling, by the motor controller, a motor to generate a rear-wheel regenerative braking operation according to the rear-wheel regenerative braking performance command value received from the vehicle controller, wherein the method further includes steps of:
by the brake controller, determining a wheel slip rate based on a detection signal from a wheel-speed detector and; when the wheel slip rate is maintained at a predetermined level for a time period, transmitting a rear-wheel regenerative braking-interruption signal to the vehicle controller; and
by the vehicle controller, resetting a rear-wheel regenerative braking performance command value according to the rear-wheel regenerative braking-interruption signal to a value smaller than a current rear-wheel regenerative braking performance value; and transmitting the reset value to the motor controller,
wherein the motor controller controls a regenerative braking operation of the motor according to the actual rear-wheel regenerative braking performance value corresponding to the reset rear-wheel regenerative braking performance command value so that the rear-wheel regenerative braking operation is carried out thereby, preventing a rear wheel of the vehicle from being locked before a front wheel of the vehicle is locked or preventing spinning of the vehicle from occurring due to a locking of the rear wheel of the vehicle,
wherein when the rear wheel is locked, a rotation of the rear wheel is stopped and when the front wheel is locked, a rotation of the front wheel is stopped, and
wherein the rear-wheel regenerative braking performance command value according to the rear-wheel regenerative braking-interruption signal is reset, by the vehicle controller in response to the rear wheel regenerative braking interruption signal, to a value that decreases from the current rear-wheel regenerative braking performance value to zero.

5. The method according to claim 4 , wherein the brake controller is configured to determine a wheel-speed difference between the front wheel and the rear wheel, and when the wheel-speed difference is determined to be a predetermined level or more, transmit a rear-wheel regenerative braking-interruption signal to the vehicle controller.

6. The method according to claim 4 , wherein the brake controller is configured to receive a yaw rate-detection signal from a yaw rate detector, and when the yaw rate signal is determined to be a predetermined level or more, transmit the rear-wheel regenerative braking-interruption signal to the vehicle controller.

7. The method according to claim 4 , wherein the motor controller is configured to control the regenerative braking operation of the motor according to the actual rear-wheel regenerative braking performance value corresponding to the reset rear-wheel regenerative braking performance c

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Jeon Gab Bae

Classifications

• B60T8/50

  having means for controlling the rate at which pressure is reapplied to {or released from} the brake · CPC title

• B60T8/1725

  Using tyre sensors, e.g. Sidewall Torsion sensors [SWT] (for tyre pressure and temperature detection B60C23/00) · CPC title

• B60W2520/28

  Wheel speed · CPC title

• B60T8/1755

  Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02) · CPC title

• B60L7/10 Primary

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title