Steering Assist Activation from Predicted Lane-Change Angle
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Solution Overview
Problem
Existing driver assistance systems struggle to accurately determine the steering angle amplitude during a lane change, leading to inadequate or excessive steering assistance, as they fail to timely evaluate the driver's steering movement and match it with the necessary amplification or reduction.
Innovation Solution
A method that estimates the steering angle amplitude before the steering wheel rotation by measuring the steering angle and angular velocity, using these values to control the activation of the steering assist system, with adjustments based on vehicle and surroundings parameters to ensure stable driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the steering assistance system waits to detect the actual steering angle amplitude after the steering wheel rotation, then the measurement is more accurate, but the steering assistance activation is delayed and cannot timely match the driver's steering movement
Solution Approach 1:
The system performs preliminary estimation of the steering angle amplitude using currently available steering angle and angular velocity data before the actual maximum steering angle is reached. This allows the steering assistance system to be activated in advance, matching the driver's steering movement timing without waiting for the complete steering rotation to occur.
Solution Approach 2:
The system continuously monitors steering angle and angular velocity, using this feedback to dynamically update the estimated steering angle amplitude. This real-time feedback mechanism allows the system to adjust the assistance activation timing based on the actual driver input progression, resolving the conflict between early activation and accurate measurement.
2Productivity
If the steering assistance system activates early based on estimated steering angle amplitude, then the steering assistance timing is improved, but the estimation accuracy may be insufficient compared to actual measurement
Solution Approach 1:
The system calculates an estimated steering angle amplitude using the relationship between current steering angle, angular velocity, and the assumption of sinusoidal steering motion. This preliminary estimation enables early activation of steering assistance while maintaining sufficient accuracy for practical application, avoiding the need to wait for complete steering rotation.
Solution Approach 2:
The estimation model dynamically adapts to the actual steering motion characteristics by continuously updating based on measured angular velocity and steering angle data. This dynamic approach improves estimation accuracy over time while maintaining the speed advantage of early activation.
3Measurement precision
If the system uses complex models to accurately determine steering angle amplitude, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The system changes the approach from direct measurement to estimation using fundamental kinematic relationships between steering angle, angular velocity, and time. This parameter-based estimation method achieves sufficient accuracy without requiring complex sensors or measurement systems, maintaining device simplicity.
Data Source
AI summary
A method for managing a vehicle steering system of a vehicle having a steering assist system, including estimating a steering angle amplitude during a steering maneuver before rotating the steering wheel to the steering angle amplitude value associated with the steering maneuver. Using the estimated steering angle amplitude value to control activation of the steering assist system associated with the vehicle steering system. In one example, the estimated steering angle amplitude value adapts a torque assist signal of the steering assist system.