Regenerative Brake Force Distribution for Vehicle Stability
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Solution Overview
Problem
In environmentally friendly vehicles that perform regenerative braking at both front and rear wheels, the existing systems face challenges in maintaining vehicle stability and maximizing regenerative braking while ensuring braking performance and fuel efficiency, as the increased regenerative braking force at rear wheels can lead to wheel lock and reduced energy recovery.
Innovation Solution
A method and system for independently controlling the braking forces of front and rear wheels by generating regenerative braking force up to a reference deceleration, adjusting the distribution ratio based on a reference braking distribution, and using hydraulic braking to balance the forces, thereby ensuring stability and maximizing energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking force at rear wheels is increased to maximize energy recovery, then energy recovery amount is improved, but rear wheels are locked and vehicle spin possibility increases
Solution Approach 1:
The brake control system dynamically adjusts the distribution of regenerative braking force between front and rear wheels based on real-time vehicle conditions. The control unit varies the regenerative braking force ratio according to deceleration demand, wheel slip conditions, and vehicle speed, transforming a static braking system into a dynamic one that optimizes both energy recovery and stability under varying operating conditions.
Solution Approach 2:
The system changes the parameter of regenerative braking force distribution by introducing a variable regenerative braking force ratio. Instead of applying fixed regenerative braking at rear wheels, the control unit adjusts this ratio based on vehicle deceleration, wheel slip detection, and road conditions, thereby optimizing the balance between energy recovery and preventing wheel lock.
2Loss of energy
If regenerative braking force is maximally increased at front wheels to recover maximum energy, then energy recovery is improved, but hydraulic braking system must be configured for unbalanced front-rear braking
Solution Approach 1:
The brake control system is designed with multi-functionality to handle both maximum energy recovery scenarios and balanced braking scenarios. The control unit can operate in different modes: maximizing front wheel regenerative braking when energy recovery is priority, or distributing braking force more evenly when vehicle stability is priority. This universal design eliminates the need for separate brake system configurations.
Solution Approach 2:
The system dynamically adapts its braking force distribution strategy based on real-time conditions. When energy recovery is prioritized, it maximizes front wheel regenerative braking; when stability is prioritized, it adjusts the distribution to prevent rear wheel lock. This dynamic adaptability replaces the need for multiple fixed configurations with a single flexible control system.
3Device complexity
If same hydraulic pressure is applied to front and rear wheels using X-split pipe line, then brake system simplicity is maintained, but braking force distribution cannot be optimized for vehicles with rear wheel regenerative braking
Solution Approach 1:
The brake control system segments the hydraulic braking control into independent front and rear wheel channels. Instead of using a single X-split pipe line that applies uniform pressure, the system divides hydraulic control so that front wheel braking and rear wheel braking can be independently regulated. This segmentation enables optimized braking force distribution while maintaining reasonable system simplicity through electronic control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances vehicle stability, improves braking performance, and maximizes regenerative braking to enhance fuel efficiency by optimizing the distribution of braking forces between the front and rear wheels.
Implementation Method 1
driving motors are disposed at the front wheels. Regenerative braking force is generated when the driving motor charges a battery to recover energy
Implementation Method 2
hydraulic braking force is generated by applying the same hydraulic pressure to wheel brakes of the front and rear wheels
Implementation Method 3
braking forces of the front wheels and the rear wheels by the hydraulic brake is generated
Data Source
AI summary
A method is provided for controlling braking force in regenerative brake cooperative control of an environmentally friendly vehicle that executes regenerative braking at front wheels and/or rear wheels. A brake system that independently adjusts the braking forces of the front and rear wheels is employed to distribute braking force to assure vehicle stability, to improve fuel efficiency and to have improved braking performance.