Wheel Friction Circle Display for Real-Time Tire Slip Awareness
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Solution Overview
Problem
Existing driving assistance systems fail to accurately inform drivers about tire slip limits and tire usage, as these limits vary with tire load, and merely displaying acceleration does not convey tire usage effectively.
Innovation Solution
A driving assistance apparatus that calculates and displays a friction circle for each wheel, showing tire force and friction direction, enabling drivers to understand tire usage and potential slip through visual feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration limit values are set before vehicle traveling, then comparison with actual acceleration can be performed, but the accuracy of tire slip detection deteriorates because acceleration limit values vary significantly with tire load
Solution Approach 1:
The friction circle is dynamically updated based on real-time tire load information acquired during vehicle operation. The calculation unit recalculates the friction circle radius according to the current tire load, which varies with vehicle acceleration and steering conditions. This dynamic adaptation resolves the contradiction by making the acceleration limit values responsive to changing tire load conditions rather than using fixed pre-set values
Solution Approach 2:
The system implements feedback by continuously monitoring tire load through acceleration sensors and using this information to update the friction circle. The acquired tire load information feeds back into the calculation unit, which adjusts the friction circle radius accordingly. This closed-loop feedback mechanism ensures that the acceleration limit values always correspond to the current tire load condition, resolving the accuracy versus adaptability contradiction
2Ease of operation
If only magnitude and direction of vehicle acceleration are displayed, then simple visual feedback is provided, but the driver cannot understand how appropriately the tire is being used
Solution Approach 1:
The system adds a new dimension to the display by introducing the friction circle as a visual reference framework. Instead of merely displaying acceleration magnitude and direction, the friction circle provides a contextual boundary that represents the tire's maximum capability. This dimensional addition allows the driver to understand tire usage appropriateness while maintaining visual simplicity through the intuitive circular graphic
Solution Approach 2:
The friction circle acts as an intermediary visual element that bridges the gap between raw acceleration data and tire usage understanding. It translates complex tire mechanics into an easily interpretable visual metaphor where the circle's radius represents maximum tire capability and the vehicle's operating point shows current tire usage. This intermediary visualization resolves the contradiction by conveying tire usage information without complicating the display
Data Source
AI summary
A driving assistance apparatus according to the present disclosure includes: a vehicle acceleration detection unit configured to detect vehicle acceleration including lateral acceleration and longitudinal acceleration of a vehicle; a calculation unit configured to calculate for each wheel a friction circle, and a lateral force generated at each wheel and a longitudinal force generated at each wheel on the basis of a result of detection by the vehicle acceleration detection unit; and a display unit configured to display an image based on the friction circle, and a magnitude and/or a direction of a resultant force of the lateral force and the longitudinal force generated at each wheel based on a result of calculation by the calculation unit.