Vehicle Control Disengagement Detection Using Wheel Angle Difference
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Solution Overview
Problem
Current methods fail to accurately detect false positive requests to disengage vehicle control systems, leading to unintended disengagement and potential safety hazards due to unreliable torque detection and high false positive rates.
Innovation Solution
A system that monitors the angle and rate of change of road and steering wheel angles relative to the vehicle's longitudinal axis, using predetermined threshold values to differentiate between legitimate disengagement requests and false positives, thereby preventing unintended disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque detection is used to detect disengagement requests, then the system can respond to steering inputs, but the detection accuracy is low and false positive rate is high
Solution Approach 1:
The patent replaces the mechanical torque detection system with an electronic control system that monitors road wheel angle and steering wheel angle through sensors and processors. This substitution eliminates the reliance on torque sensor precision while achieving more reliable disengagement request detection through angle difference comparison.
Solution Approach 2:
The patent introduces road wheel angle and steering wheel angle as intermediary parameters between the driver's steering input and the disengagement request detection. By monitoring these intermediate angular parameters and their differences, the system indirectly detects driver intent without relying on direct torque measurement, thereby improving detection reliability.
2Ease of operation
If the vehicle control system disengages based on road wheel angle input, then the system responds to driver intent, but unintended disengagement occurs due to false positives
Solution Approach 1:
The patent implements a feedback mechanism where the electronic control system continuously monitors both road wheel angle and steering wheel angle, compares their differences against threshold values, and adjusts disengagement decisions based on this feedback. This closed-loop approach ensures that disengagement occurs only when the angle difference pattern confirms genuine driver intent, preventing false positive disengagements while maintaining responsive operation.
3Device complexity
If torque-based detection is used, then hardware requirements are met, but false positive rate remains high
Solution Approach 1:
The patent makes the existing steering angle sensors serve multiple functions: they simultaneously provide steering wheel position information for normal control operations and road wheel angle information for disengagement request detection. This multi-functionality eliminates the need for separate torque sensors or additional hardware while achieving superior detection reliability through angle difference analysis.
Data Source
AI summary
Systems, methods, and other embodiments described herein relate to detecting a false positive request to disengage a vehicle control system. In one embodiment, a method includes detecting a false positive request to disengage a vehicle control system based on a difference between a road wheel angle input and an angle of a road wheel controlled by the road wheel angle input and preventing the vehicle control system from disengaging based on detecting the false positive request.