AWD Regenerative Braking Torque Split to Prevent Wheel Slip
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Solution Overview
Problem
Regenerative braking in four-wheel drive vehicles can lead to wheel slip and reduced fuel efficiency when excessive torque is applied to either drive axle, compromising vehicle safety and performance.
Innovation Solution
A vehicle control apparatus and method that distributes regenerative braking torque between the main and auxiliary drive axles based on driving information and multiple distribution maps, optimizing braking for safety and efficiency by determining a braking distribution ratio and controlling torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If regenerative braking torque is applied only to the main drive axle, then device complexity is reduced, but wheel slip may occur causing loss of reliability
Solution Approach 1:
The braking torque is segmented and distributed to different drive axles based on their operational status. The controller divides the total regenerative braking torque between the main drive axle and auxiliary drive axle according to a dynamic distribution ratio, preventing wheel slip while maintaining system reliability without requiring complex additional hardware
Solution Approach 2:
The braking distribution ratio between main and auxiliary drive axles is made dynamic rather than fixed. The controller adjusts the distribution ratio in real-time based on driving conditions, wheel slip detection, and axle operational status, allowing the system to adapt to changing conditions and maintain optimal braking performance
2Loss of energy
If regenerative braking torque is excessively applied to a drive axle, then fuel efficiency is improved, but wheel slip occurs reducing reliability
Solution Approach 1:
The braking control system incorporates feedback mechanisms that monitor wheel slip conditions and braking torque application. When wheel slip is detected or anticipated, the controller adjusts the distribution ratio to reduce torque on the affected axle, preventing loss of braking safety while maximizing energy recovery during normal conditions
Solution Approach 2:
The system dynamically changes the braking distribution ratio parameter based on operating conditions. By adjusting this parameter, the controller optimizes the balance between maximizing regenerative braking torque (for fuel efficiency) and preventing wheel slip (for reliability), allowing flexible adaptation to different driving scenarios
3Adaptability or versatility
If multiple distribution maps are used to determine braking distribution ratio, then adaptability to different driving conditions is improved, but device complexity increases
Solution Approach 1:
Multiple distribution maps serve universal braking optimization purposes across different driving conditions. Each map provides pre-calculated optimal distribution ratios for specific scenarios (e.g., high-speed turning, high-speed deceleration, fuel efficiency optimization), allowing the system to adapt to various conditions by simply selecting the appropriate map without requiring complex real-time calculations
Solution Approach 2:
The distribution maps contain pre-computed optimal braking distribution ratios for various driving conditions. By preparing these maps in advance, the system eliminates the need for complex real-time optimization calculations during actual braking events, reducing computational complexity while maintaining high adaptability to different driving scenarios
Data Source
AI summary
A vehicle control apparatus includes a processor and a storage medium storing instructions that, when executed by the processor, may cause the vehicle control apparatus to collect driving information of a vehicle, determine, based on the driving information and a plurality of distribution maps, a braking distribution ratio between a main drive axle and an auxiliary drive axle of the vehicle, determine, based on the braking distribution ratio, first regenerative braking torque for the main drive axle and second regenerative braking torque for the auxiliary drive axle, and control, based on the first regenerative braking torque and the second regenerative braking torque, regenerative braking of the vehicle.