Steer-by-Wire Driver State Detection Using Predicted Steering Signals
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Solution Overview
Problem
Semi-autonomous and fully autonomous vehicles with steer-by-wire steering systems lack direct haptic feedback, making it difficult for drivers to perceive road conditions and vehicle behavior, increasing uncertainty and reaction times, especially in critical situations, and pose challenges in detecting hand presence on the steering wheel due to the absence of mechanical connections.
Innovation Solution
A computer-implemented method using recorded steering parameters from a steer-by-wire system, combined with predictive modeling, to detect changes in a driver's state by comparing predicted and recorded parameters at different time intervals, employing various regression and classification algorithms to determine state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steer-by-wire steering system is used, then design freedom and integration of driver assistance systems are improved, but haptic feedback is lost
Solution Approach 1:
The patent introduces an intermediary system that includes sensors (torque sensor, angle sensor, acceleration sensor) and a control unit that generates artificial haptic feedback. This intermediary translates the electrical signals and vehicle state data into tactile feedback through the steering wheel, allowing the driver to perceive road conditions and vehicle behavior without direct mechanical connection.
Solution Approach 2:
The system implements a feedback loop where sensors continuously monitor steering wheel torque, angle, and vehicle acceleration, and the control unit processes this data to generate appropriate haptic feedback signals. This closed-loop feedback restores the information flow from road to driver that was lost in the mechanical connection.
2Adaptability or versatility
If steer-by-wire steering system is used, then design freedom is improved, but driver control feeling is reduced
Solution Approach 1:
The control unit acts as an intermediary that processes vehicle state data and generates artificial resistance forces through the steering wheel. This intermediary creates a virtual mechanical connection that provides the driver with intuitive control feeling and feedback about vehicle dynamics, maintaining ease of operation despite the electrical steering system.
3Ease of manufacture
If traditional torque measurement is used, then hand presence detection is simple, but mechanical connection is required
Solution Approach 1:
The patent makes the steering system components multi-functional. The existing torque sensor, angle sensor, and acceleration sensor used for steering control are also utilized for hand presence detection. This universal use of sensors eliminates the need for separate detection systems and removes the requirement for mechanical connections, as all detection is performed through electrical signals in the steer-by-wire system.
4Device complexity
If capacitive touch sensors are used for hand detection, then mechanical connection is eliminated, but false alarms increase
Solution Approach 1:
The patent merges multiple sensing modalities (torque sensor, angle sensor, acceleration sensor) into a unified detection system. By combining data from these different sensors and analyzing them together through pattern recognition, the system achieves more reliable hand presence detection that is not susceptible to false alarms from environmental conditions or driving practices.
Solution Approach 2:
The system uses feedback from multiple sensors to continuously monitor and verify hand presence status. The control unit cross-checks data from torque, angle, and acceleration sensors to confirm detection results, reducing false alarms by requiring consistent signals across multiple measurement channels before triggering a hand presence determination.
Data Source
AI summary
A computer-implemented method for detecting a change in the driver's state with a steer-by-wire steering system includes (i) recording data of at least one steering parameter from the steer-by-wire steering system over a measurement time, (ii) predicting the at least one steering parameter based on the recorded data for a test time, (iii) recording the at least one steering parameter at test time, and (iv) detecting a change in the driver's state using the predicted steering parameter and the detected at least one steering parameter at the test time.