Adaptive EV Regenerative Braking for Grip-Limited Torque Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional regenerative braking systems in electric vehicles apply a fixed amount of regenerative torque, limiting energy recovery under varying road and tire grip conditions, and may lead to wheel slip and inefficient energy conversion.
Innovation Solution
An adaptive regenerative braking system that determines a regenerative braking parameter based on real-time grip information, including radial speeds of both regenerative and non-regenerative braking wheels, and adjusts torque to prevent slipping under worst grip conditions, optimizing energy recovery and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed amount of regenerative torque is applied to prevent wheel slip, then vehicle stability is improved, but energy recovery is reduced
Solution Approach 1:
The regenerative braking system transitions from a static fixed torque approach to a dynamic adaptive torque application. The control system continuously monitors grip conditions and adjusts the regenerative braking torque in real-time, allowing the system to maximize energy recovery when grip is sufficient while maintaining stability when grip is limited.
Solution Approach 2:
The system changes the regenerative braking parameter (torque amount) based on detected grip conditions. By varying the torque parameter according to actual road and tire grip levels, the system optimizes the balance between energy recovery and wheel slip prevention, rather than using a conservative fixed torque value.
2Loss of energy
If regenerative braking torque is increased to maximize energy recovery, then energy gain is improved, but wheel slip risk increases
Solution Approach 1:
The system implements a feedback mechanism where grip conditions are continuously monitored and used to adjust regenerative braking torque. This closed-loop control allows the system to respond to changing road conditions, increasing torque when grip is abundant and reducing it when slip risk increases, thereby maximizing energy recovery safely.
Solution Approach 2:
The system performs preliminary grip assessment before applying full regenerative braking torque. By evaluating grip conditions in advance and adjusting torque accordingly, the system prevents wheel slip before it occurs rather than reacting after slip begins, enabling more aggressive and efficient energy recovery.
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
Enhances energy recovery during braking by applying minimal torque to prevent slipping, ensuring vehicle stability and safety while maximizing energy gain under varying grip conditions.
Implementation Method 1
Electric vehicles (EVs) utilize regenerative braking to recover kinetic energy during deceleration, converting it into electrical energy that can be stored in the battery
Data Source
AI summary
There is provided a method for adaptive regenerative braking, the method includes obtaining grip information that is indicative of a grip associated with an electrical vehicle during a grip evaluation period; determining, based on the grip information, a value of a regenerative braking parameter; and sending to a regenerative braking unit of the vehicle an instruction to apply during a portion of the regenerative braking period, the regenerative braking parameter.