Steering Assist System Driver Override Detection
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Solution Overview
Problem
Existing driver assistance systems in vehicles struggle to accurately determine when to provide steering assistance and when to relinquish control to the driver, particularly during dynamic maneuvers, leading to potential conflicts between the system's intended path and the driver's actual intention.
Innovation Solution
A method that determines discrepancies between the steering assistance provided by the system and the driver's intention by analyzing steering parameters such as torque and angle, and adjusts or deactivates the assistance accordingly, using sensors and algorithms to account for driver overrides and adapt to the driver's steering intentions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering assist system provides automatic steering assistance to maintain lane position, then lane keeping capability is improved, but driver control authority deteriorates when the driver intends to override the system
Solution Approach 1:
The steering assist system dynamically adjusts its control authority based on detected driver intention. When driver override is detected through steering torque or angle analysis, the system reduces or deactivates assistance to restore full driver control. This dynamic adaptation resolves the contradiction by allowing the system to switch between autonomous lane-keeping mode and driver-controlled mode as needed
Solution Approach 2:
The system continuously monitors steering parameters (torque, angle, rate of change) to detect driver intention and provides feedback by adjusting the steering assistance accordingly. This closed-loop feedback mechanism allows the system to recognize when the driver intends to override and appropriately reduces assistance, maintaining both lane-keeping reliability and driver control authority
2Measurement precision
If the steering assist system continuously monitors steering parameters to detect driver intention, then driver override detection accuracy is improved, but system complexity increases
Solution Approach 1:
The steering assist system uses its existing steering torque and angle sensors to detect driver intention without requiring additional dedicated detection hardware. By analyzing parameters already being measured for steering control, the system achieves accurate driver override detection while avoiding increased device complexity
Solution Approach 2:
The steering parameters (torque, angle) are measured for both steering control and driver intention detection purposes. This multi-functionality allows the system to achieve accurate driver override detection using existing sensors, avoiding the need for separate detection systems and thereby reducing overall system complexity
3Speed
If the steering assist system deactivates assistance upon detecting driver override, then driver control responsiveness is improved, but transition smoothness deteriorates
Solution Approach 1:
Before completely deactivating steering assistance upon detecting driver override, the system gradually reduces the assistance level. This cushioning approach prevents abrupt transitions that could startle the driver or cause loss of control, while still achieving responsive driver authority. The gradual reduction acts as a buffer between full assistance and no assistance states
Data Source
AI summary
A method for operating a steering assist system of a motor vehicle, in which during a steering movement of the driver while driving the vehicle a steering assistance is determined. The steering assistance provided by an electro-hydraulic or electro-mechanical drive and may depend on the vehicle speed. The steering assistance providing a supportive force or a supporting moment to the steering system, wherein the provision of the steering assistance depends on the result of a judgment of whether there is a discrepancy between the determined steering assistance and the driver's steering intention based on a steering movement of the driver and a current value at least one steering parameter. A discrepancy exists between the steering assistance and the driver's intention to drive when a current value of a steering parameter exceeds a predetermined limit value. The steering parameters including a deviation between a steering assist torque and the driver steering torque exceeding a predetermined limit or the steering angle exceeding a predetermined limit. In such cases, the steering assistance is adjusted or prevented.