Electronic Steering Compensation for Self-Steering Faults
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Solution Overview
Problem
Existing electronic steering systems fail to effectively compensate for unintentional steering wheel movement caused by self-steering actuators, leading to increased steering wheel angular speed and unintended vehicle steering, which compromises system functionality and comfort.
Innovation Solution
An electronic steering system that includes a control device to detect erroneous self-steering of the steering wheel actuator, estimate the resulting steering wheel angle error, and implement compensatory measures by modifying the control of the road wheel actuator to reduce or eliminate the road wheel angle error, using transfer functions and compensatory measures such as changing gear ratios and applying counter-torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-steering compensation is not implemented, then the steering wheel actuator generates unintentional steering wheel movement, but implementing compensation increases system complexity
Solution Approach 1:
The system continuously monitors the steering wheel angle and road wheel angle through sensors, compares actual values with target values, and dynamically adjusts the road wheel actuator control signals to compensate for self-steering effects. This closed-loop feedback mechanism ensures steering accuracy while managing system complexity through intelligent control algorithms.
Solution Approach 2:
The control device acts as an intermediary between the steering wheel actuator and road wheel actuator, processing sensor data and generating compensatory control signals. This intermediary component coordinates the interaction between actuators, enabling self-steering compensation without requiring direct modification of the actuators themselves.
2Manufacturing precision
If compensatory measures are implemented to reduce road wheel angle error, then steering precision is improved, but response time is increased
Solution Approach 1:
The system performs preliminary calculations of the required compensatory control signals based on predicted self-steering effects, allowing the road wheel actuator to begin correction before the full error manifests. This anticipatory approach reduces the effective response time while maintaining precision.
Solution Approach 2:
The compensatory control operates continuously rather than in discrete steps, with the control device constantly adjusting the road wheel actuator position based on real-time sensor feedback. This continuous adjustment eliminates idle time between corrections and maintains steady steering precision throughout operation.
Data Source
AI summary
This application relates generally to a procedure for operating a vehicle with an electronic steering system. A method for operating a vehicle with an electronic steering system includes controlling a road wheel actuator based on a detected steering wheel angle of a steering wheel operably coupled to a steering wheel actuator so that a steerable road wheel assumes a road wheel angle defined by the detected steering wheel angle in accordance with a transfer function, wherein the transfer function describes a dependence of the road wheel angle to the detected steering wheel angle, detecting a self-steering fault of the steering wheel actuator, and based on the detected self-steering fault estimating a steering wheel angle error, and triggering at least one compensatory measure, so that a road wheel angle error is at least reduced.