Steering Holding Determination via Predicted Wheel Angle
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Solution Overview
Problem
Current steering control devices face challenges in accurately determining whether a driver is holding the steering member, which affects the switching between manual and automatic driving modes.
Innovation Solution
A steering holding determination device that calculates a predicted value of a state quantity related to the turning angle of a wheel using a predicted value calculation unit and determines the steering holding state by comparing it with actual measured values, improving the accuracy of driver input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional steering control devices use basic torque and inertia measurements to determine driver input, then the device complexity remains low, but the measurement precision of driver holding state is insufficient
Solution Approach 1:
The patent introduces a predicted value calculation unit as an intermediary component that computes expected steering wheel state values based on vehicle dynamics models. This intermediary prediction mechanism enables comparison between predicted and actual sensor values, thereby improving measurement precision of driver holding state without requiring direct complex sensing of driver intent.
Solution Approach 2:
The system implements feedback by continuously comparing actual steering wheel state measurements with predicted values generated by the prediction calculation unit. This feedback loop allows the system to detect deviations indicating driver input, improving the accuracy of steering holding state determination through iterative validation.
2Measurement precision
If the system uses multiple torque components (torsion bar torque, steering wheel inertia torque, gravity torque) to estimate driver torque, then the measurement precision improves, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the total driver torque estimation into distinct measurable components: torsion bar torque from the steering shaft, steering wheel inertia torque from rotational acceleration, and gravity torque from steering wheel position. By dividing the complex measurement task into separable physical components, the system achieves high measurement precision while keeping each individual measurement relatively simple.
Solution Approach 2:
The system replaces direct mechanical measurement of driver torque with a computational approach that calculates torque from measurable physical parameters (steering angle, angular acceleration, vehicle speed). This substitution of mechanical sensing with physics-based calculation reduces measurement difficulty while maintaining high precision.
Data Source
AI summary
A steering holding determination device configured to determine whether a driver holds a steering member, the steering holding determination device including: a predicted value calculation unit configured to sequentially calculate a predicted value of a state quantity with reference to a steering torque and an actual measured value of the state quantity, the state quantity being related to a turning angle of a wheel; and a steering holding determination unit configured to determine whether the driver holds the steering member with reference to the predicted value calculated by the predicted value calculation unit and an actual measured value corresponding to the predicted value.