Vehicle Steering Return Torque Adjustment for Torque Steer Mitigation
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Solution Overview
Problem
Existing vehicle steering systems face limitations in mitigating torque steer and traction steer, especially at high speeds and in electric vehicles, where typical unintended steering mitigation systems fail to provide adequate control, leading to erratic steering behavior.
Innovation Solution
A system that includes a processor and memory to receive hand wheel measurements, determine a hand wheel return value, and adjust it based on propulsion torque values above a threshold, using scale factors for transmission and motor torque to selectively control the steering mechanism and return it to a centered position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If typical unintended steering mitigation systems are used, then steering control is provided during normal operation, but the system fails to provide adequate control at high speeds and in electric vehicles, leading to erratic steering behavior
Solution Approach 1:
The system dynamically adjusts the hand wheel return value based on real-time torque measurements and vehicle speed. The controller modifies the return torque characteristics adaptively, changing the steering mitigation strategy according to operating conditions such as acceleration events and speed ranges, thereby maintaining reliable control across diverse scenarios including high-speed and electric vehicle operations
Solution Approach 2:
The system changes the parameters of the return torque by adjusting the hand wheel return value based on detected torque events and speed conditions. Different return torque characteristics are applied depending on whether the vehicle is undergoing acceleration, the current speed range, and the type of vehicle, enabling adequate control in previously problematic high-speed and electric vehicle conditions
2Manufacturing precision
If return torque is applied to reduce torque steer, then steering accuracy is improved, but the system complexity increases due to multiple sensors and control algorithms
Solution Approach 1:
The controller performs multiple functions using a unified approach: it processes hand wheel measurements, detects torque events, determines return torque values, and adjusts the hand wheel return value all within a single control algorithm framework. This multi-functional design reduces the need for separate dedicated components for each function, thereby managing system complexity while maintaining steering accuracy
Solution Approach 2:
The system continuously monitors hand wheel position, torque, and speed, using this feedback to dynamically adjust the return torque characteristics. The controller receives real-time data from sensors, processes it through control algorithms, and modifies the steering mitigation strategy accordingly, creating a closed-loop system that maintains accuracy without requiring overly complex open-loop control mechanisms
Data Source
AI summary
A method for unintended steering mitigation includes receiving at least one hand wheel measurement correspond to a hand wheel of a vehicle. The method also includes determining a hand wheel return value corresponding to the at least one hand wheel measurement. The method also includes receiving a torque value corresponding to propulsion of the vehicle. The method also includes determining whether the torque value is above a threshold. The method also includes, in response to a determination that the torque value is above the threshold adjusting the hand wheel return value based on the torque value and selectively controlling return of the hand wheel based on the adjusted hand wheel return value.