Motor Torque Control for Wheel Slip Prevention
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Solution Overview
Problem
Motor-driven vehicles, especially those with electric motors, experience excessive wheel slip on low-friction surfaces due to rapid output torque response, which existing traction control systems struggle to manage effectively before applying sufficient torque adjustments.
Innovation Solution
A control method and system that calculates a correction torque based on the difference and variance rate of wheel speeds, adjusting the drive motor torque to prevent wheel slip by operating the motor based on either the current required torque or the calculated correction torque, thereby reducing the likelihood of wheel slip before TCS intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electric motor-driven vehicle accelerates on low friction road, then rapid torque response is achieved, but excessive wheel slip occurs
Solution Approach 1:
The system performs preliminary detection of wheel slip conditions by monitoring wheel speed differences and variance rates before excessive slip occurs. When wheel slip is detected early, the control system proactively limits the drive torque command to prevent the harmful effect of excessive wheel slip, rather than reacting after the problem has fully developed.
Solution Approach 2:
The system continuously monitors wheel speeds and calculates the difference and variance rate between wheels. This feedback information is used to dynamically adjust the drive torque command, creating a closed-loop control system that responds to actual wheel slip conditions and modifies torque output accordingly to prevent excessive slip.
2Object-affected harmful factors
If TCS performs brake adjustment and torque limitation, then wheel slip is reduced, but response time is delayed
Solution Approach 1:
The system calculates a correction torque value in advance based on wheel speed differences and variance rates. This pre-calculated correction torque is ready to be applied immediately when wheel slip is detected, eliminating the delay associated with real-time torque limitation calculations during active slip events.
Solution Approach 2:
The system dynamically adjusts the drive torque command by applying a pre-calculated correction torque that varies based on current wheel slip conditions. This dynamic adjustment allows the system to respond rapidly to changing slip conditions without the computational delay of calculating torque limitations in real-time during slip events.
Data Source
AI summary
A control method for a motor-driven vehicle is provided. The method includes calculating a correction torque of a drive motor through a difference between speeds of wheels or a variance rate of the difference between speeds of the wheels and comparing a calculated correction torque with a current required torque of the drive motor. When the calculated correction torque is greater than the current required torque, the drive motor is operated based on the current required torque. When the calculated correction torque is less than or equal to the current required torque, the drive motor is operated based on the calculated correction torque, or the required torque of the drive motor is corrected to correspond to the calculated correction torque and the drive motor is operated based on a corrected required torque of the drive motor.