Regenerative Brake Bias Control via Torque Redistribution
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Solution Overview
Problem
Existing vehicle braking systems that combine frictional and regenerative braking devices lack an efficient method to dynamically adjust brake bias, which is essential for optimizing vehicle performance during cornering and acceleration by effectively distributing torque between axles.
Innovation Solution
A method and system that receive a brake bias command, determine the desired brake bias, and adjust the overall brake bias in a vehicle braking system using regenerative braking devices while maintaining the total negative torque applied to the axles, allowing for dynamic distribution of torque between frictional and regenerative braking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking devices are used to adjust brake bias, then energy recovery is improved, but control complexity increases
Solution Approach 1:
The regenerative braking devices serve multiple functions: they provide energy recovery during braking and simultaneously act as controllable torque sources for adjusting brake bias distribution. This multi-functionality reduces the need for separate bias adjustment mechanisms, thereby limiting the increase in control complexity
2Stability of the object's composition
If total negative torque is maintained constant while adjusting brake bias, then braking stability is improved, but torque distribution flexibility is reduced
Solution Approach 1:
The system dynamically redistributes torque between frictional and regenerative braking devices while maintaining constant total negative torque. The regenerative devices provide variable torque to adjust bias, while frictional braking compensates to keep total torque constant, achieving both stability and flexibility
Data Source
AI summary
A method and system for controlling the overall brake bias in a vehicle braking system having both frictional and regenerative braking devices. The method comprises receiving a brake bias command and determining a desired brake bias based on the brake bias command. The method further comprises changing the brake bias in the vehicle braking system to achieve the desired brake bias through the operation of one or more regenerative braking devices. The system comprises one or more regenerative braking devices, each configured to apply negative torque to one of a first axle or a second axle of the vehicle, and an electronic module, for example, an electronic brake control module (EBCM) that is configured to perform the above-described methodology.