Steer-by-Wire Steering Feel Adaptation for Actuator Faults
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Solution Overview
Problem
Conventional steer-by-wire steering systems face challenges in maintaining operational safety and controllability when the feedback actuator fails, leading to unintended steering movements.
Innovation Solution
A method for operating a steer-by-wire steering system that modifies the steering feel by adapting the feedback actuator's operation in response to an initial error, allowing for a controlled transition from normal to modified steering feel, enhancing driver preparedness and vehicle maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the feedback actuator is designed to provide active feedback torque in normal operation, then steering feel and driver comfort are improved, but operational safety deteriorates when the feedback actuator fails causing unintended steering movements
Solution Approach 1:
The system performs preliminary detection of initial errors in the operating unit before complete failure occurs. When an initial error is detected, the system proactively modifies the steering characteristic by adjusting the feedback torque to create a modified steering feel that prepares the driver for potential complete failure, rather than waiting for actual failure to take corrective action
Solution Approach 2:
The system continuously monitors the operating unit for errors and uses this feedback information to dynamically adjust the feedback actuator's torque output. The feedback mechanism detects initial errors and triggers a modification of the steering characteristic, creating a closed-loop control system that adapts to degraded conditions
2Reliability
If the operating unit is designed to be fail-operational, then operational continuity is maintained, but unintended steering movements occur when feedback actuator failure happens
Solution Approach 1:
The system takes preliminary action by detecting initial errors and modifying the steering characteristic before complete failure occurs. This preliminary modification of feedback torque prepares the driver for potential complete failure and prevents unintended steering movements that would occur without such preparation
Solution Approach 2:
The system applies preliminary anti-action by creating a modified steering feel that counteracts the potential harmful effect of complete feedback actuator failure. The modified steering characteristic prepares the driver in advance, creating a compensatory effect that prevents unintended steering movements when failure occurs
3Ease of repair
If the feedback torque is suddenly lost upon failure, then the feedback actuator can be简单地 switched off, but uncontrollable steering movements occur at the steering handle
Solution Approach 1:
The system performs preliminary action by detecting initial errors and gradually modifying the steering characteristic before complete failure. This gradual modification allows the feedback actuator to be simply switched off upon failure while preventing uncontrollable steering movements, as the driver has already been prepared through the modified steering feel
Data Source
AI summary
The disclosure relates to a method for operating a steering system of a vehicle, in particular a motor vehicle, in which the steering system is designed as a steer-by-wire steering system having an at least partially fail-operational operating unit with at least one steering handle and with at least one feedback actuator that interacts with the steering handle, and having at least one wheel steering angle control element, which is operatively connected to the operating unit, for changing a steering angle of at least one vehicle wheel. The method includes changing a steering characteristic of the steering system in at least one operating state in which an initial error of the operating unit is ascertained, and modifying a steering feel in a controlled manner, in particular by means of a feedback actuator operation that is adapted to the initial error.