Two-Wheeled Vehicle Turn Detection via Wheel Speed Differential
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Solution Overview
Problem
Existing two-wheeled motor vehicle systems fail to accurately detect turns at high speeds, as the difference in course between the front and rear wheels is small when the vehicle turns by banking without rotating the steering, making it difficult for existing devices to determine the vehicle's turn effectively.
Innovation Solution
A control device for a two-wheeled motor vehicle that includes sensors for detecting the rotation speeds of both wheels and a turn determining section, which calculates a value corresponding to the bank angle based on the relative rotation speeds of the wheels to determine if the vehicle is turning, by utilizing the difference in curvature radii of the tires and the bank angle to accurately detect turns at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle turns by banking without rotating the steering at high speed, then the turn can be executed smoothly, but the difference in course between the front and rear wheels becomes small making turn detection difficult
Solution Approach 1:
The patent introduces an intermediary calculation method that uses the difference in rotation speeds between front and rear wheels as a mediator to infer the bank angle. Instead of directly measuring the small course difference, the system calculates a value corresponding to the bank angle based on rotation speed differences, which serves as an indirect but more reliable indicator of turning state at high speeds.
Solution Approach 2:
The patent changes the detection parameter from direct course difference to rotation speed difference. By monitoring how the rotation speeds of front and rear wheels differ during banking, the system can accurately determine turn state even when the physical course difference is minimal. This parameter transformation enables effective turn detection across both low and high speed conditions.
2Measurement precision
If the steering is rotated for turn detection, then the course difference between wheels increases improving detection, but the vehicle cannot turn smoothly at high speed
Solution Approach 1:
The system uses rotation speed difference as an intermediary parameter that can be detected without affecting steering operation. This mediator allows the vehicle to maintain smooth banking turns while the control device simultaneously monitors the rotation speed differences to accurately determine turn state, eliminating the need to rotate steering for detection purposes.
3Device complexity
If the curvature radii of front and rear tires are the same, then the vehicle structure is simplified, but the turn detection precision deteriorates
Solution Approach 1:
The patent changes the detection approach to rely on rotation speed parameters rather than physical tire geometry. Even when front and rear tires have the same curvature radius, the system can accurately detect turns by monitoring how their rotation speeds differ during banking. This parameter-based approach maintains structural simplicity while achieving high detection precision.
Data Source
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AI summary
Provided is a device for an automatic two-wheeled vehicle, which can properly detect a turn of the vehicle. A device for an automatic two-wheeled vehicle is provided with a sensor for detecting the rotation speed of a front wheel, and a sensor for detecting the rotation speed of a rear wheel. The control device calculates a value representing the relative magnitude of the rotation speed of the rear wheel with respect to the rotation speed of the front wheel as a value corresponding to a bank angle, and determines that the vehicle is turning on condition that the value corresponding to the bank angle is higher than a threshold value.