Regenerative Torque Limit Control for Low-Friction Commercial Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Regenerative braking in commercial vehicles can cause wheel slippage and reduced stability due to high torque application, especially in low-friction conditions such as rain or snow, and excessive torque limitation during low-speed, high-weight conditions.
Innovation Solution
An apparatus and method for controlling vehicle regenerative torque that adjusts the maximum allowable torque limit based on vehicle speed, weight, weather, and road conditions, using a basic mode controller and a safe mode controller to optimize torque application and prevent wheel slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high regenerative torque is applied during regenerative braking control, then energy recovery efficiency is improved, but wheel slippage occurs and vehicle stability is reduced
Solution Approach 1:
The patent implements dynamic adjustment of maximum allowable regenerative torque based on real-time driving conditions including vehicle speed, weight, and road friction coefficients. The control system transitions between basic mode (higher torque limits) and safe mode (lower torque limits) to optimize energy recovery while preventing wheel slippage and maintaining vehicle stability under varying operational conditions.
Solution Approach 2:
The system changes the torque parameter dynamically by adjusting the maximum allowable regenerative torque value based on detected driving conditions. When road friction is low (rain/snow conditions) or vehicle speed is low, the system reduces the torque parameter to prevent wheel slippage, thereby maintaining vehicle stability while still enabling energy recovery.
2Reliability
If maximum regenerative torque is limited to prevent wheel slippage, then vehicle stability is maintained, but energy recovery efficiency is reduced
Solution Approach 1:
The control system dynamically adjusts torque limits based on real-time conditions rather than applying a fixed limitation. During favorable conditions (high speed, high weight, good road friction), the system operates in basic mode with higher torque allowances, maximizing energy recovery while maintaining stability. During unfavorable conditions, it transitions to safe mode with appropriate limitations.
Solution Approach 2:
The system optimizes the torque parameter by adjusting maximum allowable regenerative torque values based on detected conditions including vehicle speed, weight, and road friction. This selective parameter adjustment ensures energy recovery efficiency is maximized when conditions permit, while stability is maintained when conditions require limitation.
3Reliability
If fixed maximum torque limit is applied during regenerative braking, then wheel slippage is prevented under certain conditions, but torque is overly limited during conditions where higher torque is safe
Solution Approach 1:
The patent implements a dynamic control system that adjusts maximum allowable regenerative torque based on real-time detection of vehicle speed, weight, and road friction coefficients. The system transitions between basic mode (permissive torque limits) and safe mode (restrictive torque limits) based on current driving conditions, thereby preventing wheel slippage when necessary while allowing optimal torque application when conditions permit, thus improving overall regenerative braking performance.
Solution Approach 2:
The system optimizes the torque parameter by dynamically changing maximum allowable regenerative torque values based on detected driving conditions. During conditions where higher torque is safe (high speed, high weight, good friction), the system increases the torque parameter to improve regenerative braking performance. During conditions requiring limitation (low speed, low weight, poor friction), it reduces the parameter to prevent wheel slippage.
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 vehicle stability by dynamically adjusting torque limits to prevent wheel slippage and maintain control in varying driving conditions, improving safety and performance.
Implementation Method 1
regenerative braking (or regenerative brake) may be a general term for an electric braking method for converting kinetic energy into electrical energy using inertial force of a torque-driven motor (electric motor) in a closed circuit state to operate the motor as a generator
Data Source
AI summary
An apparatus for controlling vehicle regenerative torque includes an information acquisition portion configured to obtain vehicle state information including a speed and a weight of a vehicle, and navigation information including weather condition information; a basic mode controller configured to enter a basic mode while the vehicle travels, to receive a variable maximum torque map determined based on information obtained by the information acquisition portion and to perform a basic mode control logic; and a safe mode controller configured to enter a safe mode when safe mode entry conditions are satisfied, and to receive a limited maximum allowable torque value determined based on information obtained by the information acquisition portion.