Driving Assist Turning Radius Estimation via Wheel Speed Feedback
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Solution Overview
Problem
Existing driving assist systems inaccurately estimate the turning radius of a vehicle's actual driving route due to variations in vehicle characteristics and environments, leading to deviations from the intended path during automatic driving.
Innovation Solution
A driving assist system that includes first and second detection units to gather rotational information from the left and right wheels, and a processing unit to estimate the running turning radius, allowing for accurate correction of the steering angle to align the vehicle's actual route with the intended route.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the turning radius is estimated based on pre-stored steering angle data, then the system complexity is reduced, but the measurement precision of the turning radius deteriorates
Solution Approach 1:
The system uses wheel speed sensors to detect actual wheel rotation and provides feedback to the control unit. The control unit compares the actual wheel speeds with expected values based on steering angle, and adjusts the turning radius estimation accordingly. This feedback mechanism resolves the contradiction by maintaining simple pre-stored steering angle data while improving accuracy through real-time wheel speed measurement and comparison.
2Ease of operation
If the turning radius is estimated using pre-stored data associated with steering angle, then the ease of operation is improved, but the reliability of the driving assist system deteriorates
Solution Approach 1:
The control unit receives feedback from wheel speed sensors that measure actual wheel rotation during steering. This feedback is used to verify and adjust the turning radius estimation based on pre-stored steering angle data. The system maintains ease of operation by using simple pre-stored data while improving reliability through real-time feedback validation and correction of the turning radius estimation.
Data Source
AI summary
A driving assist system includes: a first detection unit configured to detect first rotational information that is information about rotation of a left wheel of a vehicle; a second detection unit configured to detect second rotational information that is information about rotation of a right wheel of the vehicle; and a processing unit configured to estimate a running turning radius of a running turning circle on a running route on which the vehicle drives from the first rotational information and the second rotational information.