Hybrid Vehicle Braking Control via Steering Angle Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full regenerative braking in hybrid vehicles can compromise steerability, stability, and smoothness during sharp turns or at very slow or fast speeds, especially on low-friction surfaces, necessitating an improved braking control method.
Innovation Solution
A method that determines the appropriate balance between regenerative and friction braking based on the vehicle's speed, steering angle, and rate of change of the steering angle, using sensors and a brake controller to calculate and apply the desired braking magnitudes, ensuring optimal control during various driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If full regenerative braking is applied, then fuel efficiency is improved, but steerability deteriorates during sharp turns or at very slow or very fast speeds
Solution Approach 1:
The system applies partial regenerative braking rather than full regenerative braking when steering conditions indicate a need for reduced braking force. The brake controller modulates the regenerative braking torque based on steering angle and rate of change, applying only the necessary portion of regenerative braking to maintain both fuel efficiency and steerability.
Solution Approach 2:
The braking system dynamically adjusts the amount of regenerative braking applied based on real-time steering conditions. The brake controller continuously monitors steering angle and rate of change, and modulates regenerative braking torque accordingly, transitioning smoothly between different braking regimes to maintain optimal steerability while maximizing fuel efficiency.
2Use of energy by moving object
If full regenerative braking is applied, then fuel efficiency is improved, but stability deteriorates during sharp turns or at very slow or very fast speeds
Solution Approach 1:
The system applies partial regenerative braking rather than full regenerative braking when stability conditions require reduced braking force. The brake controller modulates the regenerative braking torque based on steering angle and rate of change, applying only the necessary portion to maintain both fuel efficiency and vehicle stability.
Solution Approach 2:
The braking system dynamically adjusts regenerative braking application based on real-time steering conditions. The brake controller continuously monitors steering angle and rate of change, and modulates regenerative braking torque to maintain optimal stability while maximizing fuel efficiency through selective regenerative braking.
3Use of energy by moving object
If full regenerative braking is applied, then fuel efficiency is improved, but smoothness deteriorates during sharp turns or at very slow or very fast speeds
Solution Approach 1:
The system applies partial regenerative braking rather than full regenerative braking when smoothness conditions require reduced braking force. The brake controller modulates the regenerative braking torque based on steering angle and rate of change, applying only the necessary portion to maintain both fuel efficiency and ride smoothness.
Solution Approach 2:
The braking system dynamically adjusts regenerative braking application based on real-time steering conditions. The brake controller continuously monitors steering angle and rate of change, and modulates regenerative braking torque to maintain optimal smoothness while maximizing fuel efficiency through selective regenerative braking.
4Use of energy by moving object
If full regenerative braking is applied, then fuel efficiency is improved, but braking performance deteriorates on road surfaces with relatively low coefficients of friction
Solution Approach 1:
The system applies partial regenerative braking rather than full regenerative braking when road friction conditions indicate reduced traction availability. The brake controller modulates regenerative braking torque based on steering angle and rate of change, applying only the necessary portion to maintain both fuel efficiency and reliable braking performance on low-friction surfaces.
Solution Approach 2:
The braking system dynamically adjusts regenerative braking application based on real-time steering conditions that reflect road friction levels. The brake controller continuously monitors steering angle and rate of change, and modulates regenerative braking torque to maintain optimal braking performance and fuel efficiency on varying road surfaces.
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 steerability, stability, and smoothness while maintaining fuel efficiency by selectively applying regenerative and friction braking, adapting to changing driving conditions and surface friction levels.
Implementation Method 1
regenerative braking to recapture energy and recharge a high voltage battery
Implementation Method 2
friction braking based at least in part on the value of the variable
Data Source
AI summary
A method for controlling braking in a hybrid vehicle includes the steps of determining a value of a variable pertaining to operation of the hybrid vehicle and applying regenerative braking based at least in part on the value of the variable. The variable comprises a speed of the hybrid vehicle, a steering angle of the hybrid vehicle, or a rate of change of the steering angle.