Torque Steer Compensation Using Wheel Slip Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for compensating torque steer in vehicles using power steering systems are inadequate as they rely on indirect information, failing to precisely recognize torque steer variations due to wheel slip, leading to ineffective compensation.
Innovation Solution
An electronic control unit for a motor-driven power steering system calculates the actual driving torque value considering wheel slip, generating a compensation current to address torque steer by using direct information from wheel slip degrees, ensuring precise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect information (engine RPM, engine torque, acceleration pedal manipulation degree, vehicle speed) is used to estimate torque steer degree, then the power steering system can operate without additional sensors, but the torque steer degree cannot be precisely recognized when wheel slip occurs
Solution Approach 1:
The patent replaces indirect mechanical parameter estimation (engine RPM, torque, pedal position) with direct electrical signal measurement from wheel speed sensors. By using wheel speed differential information, the system directly calculates actual torque steer degree without relying on mechanical model-based estimation, thereby achieving precise measurement even during wheel slip conditions.
2Measurement precision
If wheel slip information is incorporated to calculate actual driving torque value, then torque steer compensation accuracy is improved, but the calculation complexity and processing requirements increase
Solution Approach 1:
The patent changes the input parameters from indirect mechanical parameters to direct wheel speed parameters. By using wheel speed differential as the basis for calculating driving torque value, the system achieves accurate torque steer measurement during wheel slip without requiring complex mechanical models or additional sensors, thus improving accuracy while maintaining manageable calculation complexity.
3Reliability
If conventional torque steer compensation method is used without considering wheel slip, then the system remains simple to operate, but torque steer cannot be appropriately reduced when wheel slip occurs
Solution Approach 1:
The patent introduces feedback from wheel speed sensors to continuously monitor actual wheel slip conditions and adjust torque steer compensation in real-time. The ECU calculates actual driving torque value based on wheel speed differential and feeds this information back to the power steering system, ensuring reliable torque steer compensation during wheel slip while maintaining automated operation that does not require additional driver input or complex manual adjustments.
Data Source
AI summary
The present invention relates to an electronic control unit and a method for compensating for a torque steer. The electronic control unit includes: a driving torque calculation unit that calculates a drive shaft driving torque value using engine operation information and transmission operation information; a torque steer degree calculation unit that calculates the actual driving torque value of a vehicle based on the drive shaft driving torque value, and calculates a torque steer degree by using the actual driving torque value; a compensation current calculation unit that calculates a torque steer compensation current value that compensates for the torque steer using the torque steer degree; and a motor driving control unit that calculates a basic control current value using a steering angle and a steering torque value, calculates the final control current value by adding the torque steer compensation current value to the basic control current value, and generates a control current according to the final control current value in order to supply the control current value to an electric motor.