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Vehicle and brake feedback control method thereof

A technology of brake feedback and control method, applied in the field of vehicles, can solve the problems of poor braking feeling and low braking energy recovery rate, and achieve the effects of reducing consumption, reducing consumption of high-energy hydraulic oil and improving stability

Active Publication Date: 2020-05-22
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the control strategies in related technologies do not adjust the original friction braking force, and the feedback braking force is added to the original friction braking to realize the braking function together, the braking energy recovery rate is low, and the braking feeling is poor.

Method used

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  • Vehicle and brake feedback control method thereof
  • Vehicle and brake feedback control method thereof
  • Vehicle and brake feedback control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: When the braking torque T distributed to the front motor m1 Less than or equal to the feedback limit value of the front motor (that is, the maximum feedback torque T of the front motor p1 ) and the braking torque T assigned to the rear motor m2 Less than or equal to the feedback limit value of the rear motor (that is, the maximum feedback torque T of the rear motor p2 ), that is, when the current instantaneous maximum feedback torque of the current motor is greater than the current instantaneous required braking torque of the front axle and the current instantaneous maximum feedback torque of the rear motor is greater than the current instantaneous required braking torque of the rear axle, the braking torque allocated to the front motor will be Dynamic moment T m1 As the target feedback torque of the front motor, it will be distributed to the braking torque T of the rear motor m2 As the target feedback torque of the rear motor, control the output braking t...

Embodiment 2

[0057] Embodiment 2: When the braking torque T distributed to the front motor m1 Greater than the feedback limit value of the front motor (that is, the maximum feedback torque T of the front motor p1 ) and the braking torque T assigned to the rear motor m2 Greater than the feedback limit value of the rear motor (that is, the maximum feedback torque T of the rear motor p2 ), that is, when the current instantaneous maximum feedback torque of the current motor is less than the current instantaneous required braking torque of the front axle and the current instantaneous maximum feedback torque of the rear motor is less than the current instantaneous required braking torque of the rear axle, the maximum feedback torque of the front motor T p1 As the target feedback torque of the front motor, and the maximum feedback torque T of the rear motor p2 As the target feedback torque of the rear motor, the maximum feedback torque T of the front motor is controlled at this time p1 , and ...

Embodiment 3

[0059] Embodiment 3: When the braking torque T distributed to the front motor m1 Greater than the feedback limit value of the front motor (that is, the maximum feedback torque T of the front motor p1 ) and the braking torque T assigned to the rear motor m2 Less than or equal to the feedback limit value of the rear motor (that is, the maximum feedback torque T of the rear motor p2 ), that is, when the current instantaneous maximum feedback torque of the current motor is less than the current instantaneous required braking torque of the front axle and the current instantaneous maximum feedback torque of the rear motor is greater than the current instantaneous required braking torque of the rear axle, the maximum feedback torque of the front motor T p1 As the target feedback torque of the front motor, it will be distributed to the braking torque T of the rear motor m2 As the target feedback torque of the rear motor, the maximum feedback torque T of the front motor is controlle...

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PUM

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Abstract

The invention discloses a vehicle and a braking feedback control method thereof. The vehicle comprises a front axle used for driving front wheels to move, a rear axle for driving rear wheels to move,a front motor used for driving the front axle and a rear motor used for driving the rear axle. The method comprises the following steps that the current depth of a brake pedal of the vehicle is detected; the current front axle load and the current rear axle load of the vehicle are obtained; the current required braking torque corresponding to the vehicle is obtained according to the current depthof the brake pedal, and the front motor and the rear motor are controlled to conduct braking torque distribution according to the current front axle load and the current rear axle load of the vehicleand the current required braking torque. The feedback braking force of the front motor and the back motor is adjusted by combining the front axle load and the rear axle load, so that the feedback braking force of the motors is fully used, the utilization rate of the feedback braking force of the motors is increased, the stability of the braking process of the vehicle is improved, the consumption of high-energy hydraulic oil is reduced, energy is saved, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a vehicle brake feedback control method and a vehicle. Background technique [0002] At present, most of the mechanical energy during the braking process of the vehicle is converted into heat energy through the friction of the brake and consumed. A method for regenerative braking of an electric vehicle motor is disclosed in the related art, that is, a vehicle controller or a motor controller controls the motor to perform regenerative braking according to battery capacity, battery temperature, control strategy, and the like. However, most of the control strategies in the related art do not adjust the original friction braking force, and the feedback braking force is added to the original friction braking to jointly realize the braking function, the braking energy recovery rate is low, and the braking feeling is poor. [0003] Therefore, the braking feedback control strategy in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L7/18B60L15/20
CPCB60L7/18B60L15/2009B60L2240/463Y02T10/72
Inventor 翁建平姚东亮钟志靖石为利吴春芬
Owner BYD CO LTD