Regenerative Braking Torque Control Under Wheel Slippage
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Solution Overview
Problem
Existing braking systems in hybrid and electric vehicles struggle to maintain high braking performance and efficiency when wheel-slippage occurs, often requiring a switch from regenerative braking to hydraulic braking, which can disrupt the driving experience and reduce fuel efficiency.
Innovation Solution
A braking control device and method that adjusts regenerative braking torque based on wheel-slippage through feedback control, maintaining regenerative braking while reducing it to less than the initial torque, and employing electric brake-force distribution and anti-lock braking systems to stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regenerative braking is switched to hydraulic braking when wheel-slippage occurs, then braking stability is improved, but braking performance and fuel efficiency deteriorate
Solution Approach 1:
The patent applies dynamics by making the regenerative braking torque adjustable rather than fixed. The controller dynamically adjusts the torque level based on wheel-slippage detection, allowing the system to adapt to changing road conditions while maintaining regenerative braking operation. This resolves the contradiction by enabling the system to maintain braking performance through continuous torque optimization rather than switching to hydraulic braking.
Solution Approach 2:
The patent changes the parameter of regenerative braking torque from a fixed value to a variable that can be reduced when wheel-slippage occurs. By modifying this key parameter, the system maintains regenerative braking operation (preserving fuel efficiency and braking performance) while adapting to slippage conditions through torque reduction, avoiding the need to switch to hydraulic braking.
2Stability of the object's composition
If regenerative braking torque is reduced when wheel-slippage occurs, then wheel-slippage control is improved, but braking performance deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring wheel-slippage conditions and adjusting regenerative braking torque accordingly. When slippage is detected, the controller reduces torque to regain traction, then can increase it again as conditions improve. This closed-loop feedback mechanism allows the system to maintain optimal braking performance while controlling wheel-slippage, rather than simply reducing torque permanently.
3Reliability
If hydraulic braking is used instead of regenerative braking, then braking stability is improved, but fuel efficiency deteriorates
Solution Approach 1:
The patent converts the potentially harmful effect of wheel-slippage during regenerative braking into a beneficial situation by implementing torque reduction and feedback control. This allows the system to maintain regenerative braking operation (preserving fuel efficiency) while managing slippage conditions, effectively turning a problem that would normally require switching to hydraulic braking into an opportunity to optimize energy recovery.
4Use of energy by moving object
If regenerative braking is maintained during wheel-slippage, then fuel efficiency is improved, but braking stability deteriorates
Solution Approach 1:
The patent applies dynamics by making the regenerative braking torque adjustable rather than fixed. The controller dynamically adjusts the torque level based on wheel-slippage detection, allowing the system to adapt to changing road conditions while maintaining regenerative braking operation. This resolves the contradiction by enabling the system to maintain braking performance through continuous torque optimization rather than switching to hydraulic braking.
Solution Approach 2:
The patent changes the parameter of regenerative braking torque from a fixed value to a variable that can be reduced when wheel-slippage occurs. By modifying this key parameter, the system maintains regenerative braking operation (preserving fuel efficiency and braking performance) while adapting to slippage conditions through torque reduction, avoiding the need to switch to hydraulic braking.
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 braking performance and fuel efficiency by minimizing the disruption caused by wheel-slippage, allowing regenerative braking to continue even in unstable conditions, thus improving overall vehicle stability and reducing the need for hydraulic braking.
Implementation Method 1
a braking torque of the vehicle in response to the braking request from the driver, wherein the braking torque includes a regenerative braking torque formed by a motor
Implementation Method 2
a braking torque includes a regenerative braking torque formed by a motor and a hydraulic braking torque formed by a hydraulic brake
Data Source
AI summary
A braking control apparatus includes a driving information detector configured to detect a braking request from a driver while a vehicle is driving; and a vehicle controller configured to control a braking torque of the vehicle in response to the braking request from the driver, wherein the braking torque includes a regenerative braking torque formed by a motor and a hydraulic braking torque formed by a hydraulic brake, and wherein the vehicle controller is configured to perform regenerative braking using an initial regenerative braking torque determined by the braking request from the driver, using an initial regenerative braking torque determined by the braking request from the driver, and when wheel-slippage occurs, the vehicle controller reduces the regenerative braking torque to be less than the initial regenerative braking torque.