Regenerative Brake Torque Allocation for Emergency Stability
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Solution Overview
Problem
Existing cooperative regenerative braking systems (CRBS) struggle to maintain vehicle stability and energy regeneration efficiency during emergency braking, as they fail to effectively balance the energy regeneration torque and friction braking torque.
Innovation Solution
A vehicle braking method that optimally allocates the braking-required torque between energy regeneration braking torque and friction braking torque by determining the change amounts of both torques based on the change rate of the braking-required torque, vehicle speed, wheel speed, and road adhesion coefficient, ensuring cooperative control of wheel anti-lock and energy regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing cooperative regenerative braking systems are used, then energy regeneration is attempted during braking, but vehicle stability cannot be controlled and energy regeneration efficiency is low
Solution Approach 1:
The system dynamically adjusts the allocation ratio between regenerative braking torque and friction braking torque based on real-time parameters including wheel speed, vehicle speed, and braking force requirements. This parameter-based dynamic allocation optimizes energy regeneration efficiency while maintaining vehicle stability by adapting to changing operating conditions.
Solution Approach 2:
The braking system implements dynamic torque allocation where the regenerative braking torque and friction braking torque are continuously adjusted based on real-time vehicle state. The system transitions between different braking modes smoothly, ensuring vehicle stability while maximizing energy regeneration under varying driving conditions.
2Loss of energy
If regenerative braking torque is increased to improve energy regeneration, then energy recovery increases, but control response becomes slower and vehicle stability decreases
Solution Approach 1:
The system applies regenerative braking torque partially, allocating only the necessary portion of total braking torque to regenerative braking while the remainder is handled by friction braking. This partial action approach ensures that energy recovery is optimized without compromising control response speed or vehicle stability.
Solution Approach 2:
The total braking torque is segmented into two independent components: regenerative braking torque and friction braking torque. Each component is controlled separately with its own allocation strategy, allowing the regenerative portion to be optimized for energy recovery while the friction portion maintains rapid response capability.
3Speed
If friction braking is used to ensure rapid response, then control response is fast, but energy regeneration efficiency is reduced
Solution Approach 1:
The system dynamically adjusts the friction braking torque based on real-time allocation ratios that consider wheel speed, vehicle speed, and braking force requirements. This dynamic adjustment ensures friction braking provides rapid response when needed while minimizing its use to preserve energy regeneration efficiency under suitable conditions.
Solution Approach 2:
The allocation ratio between friction braking and regenerative braking is changed based on operating parameters. When wheel speed and vehicle speed are favorable for energy recovery, the system increases regenerative braking allocation and reduces friction braking. When rapid response is required, friction braking allocation increases accordingly.
4Device complexity
If existing braking allocation methods are used, then simple control is maintained, but torque coordination between drive motor and friction brake is unbalanced
Solution Approach 1:
The system implements feedback control by continuously monitoring wheel speed, vehicle speed, and braking force requirements, then adjusting the allocation ratio between regenerative and friction braking accordingly. This feedback mechanism ensures balanced torque coordination while maintaining relatively simple control architecture through rule-based allocation strategies.
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 method enhances vehicle stability during emergency braking, improves energy regeneration efficiency, and reduces the mechanical stress on braking components by allowing for faster control responses and better torque management.
Implementation Method 1
A drive motor generates electricity, so that the regenerated energy is stored in a power battery for subsequent acceleration travel
Implementation Method 2
a brake component executing a friction torque
Data Source
AI summary
A braking method is provided, including: obtaining a braking torque of a wheel; and determining a change amount of an energy regeneration braking torque and a change amount of a friction braking torque based on a change amount of the braking torque of the wheel. The change amount of the braking torque is equal to a sum of the change amount of the energy regeneration braking torque and the change amount of the friction braking torque. According to the method, cooperative control of friction braking and energy regeneration braking in an emergency braking process is implemented, energy regeneration can be fully used to quickly respond to a braking requirement, a control response speed is faster, an energy regeneration rate is higher, and vehicle stability during emergency braking is enhanced. An apparatus for implementing the method, an electronic device, a vehicle, and a storage medium storing the method are further provided.