Straddled Vehicle Steering Angle Restriction Control
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Solution Overview
Problem
Conventional straddled vehicles face challenges in maintaining an appropriate posture due to the control device's reliance on steering angle for controlling steering torque.
Innovation Solution
The straddled vehicle incorporates a system with a steering device, a front wheel, a first detection unit, a posture detection unit, a restriction unit, and a control unit. The control unit restricts changes in the steering angle of the front wheel when detected values exceed a predetermined threshold, specifically in the bank direction, to maintain an appropriate posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control device controls steering torque based on steering angle, then the steering system is simple, but it is difficult to appropriately maintain the posture of the straddled vehicle
Solution Approach 1:
The control device receives feedback from the first detection unit (detecting steering angular velocity, acceleration of steering angle, or steering torque) and the posture detection unit (detecting bank direction), and adjusts the steering torque accordingly to maintain appropriate vehicle posture during banking maneuvers
Solution Approach 2:
The control device dynamically adjusts steering torque based on real-time detection values and predetermined thresholds, enabling the system to adapt to changing banking conditions and maintain stability during turns
2Stability of the object's composition
If the restriction unit restricts change in steering angle in the bank direction when detected value exceeds threshold, then posture stability is improved, but steering responsiveness is reduced
Solution Approach 1:
The restriction unit selectively restricts steering angle changes only in the bank direction when the detected value exceeds the predetermined threshold, while allowing steering responses in other directions or when conditions are normal, thus maintaining posture stability without completely compromising steering responsiveness
3Object-affected harmful factors
If the control unit restricts steering angle change during banking, then excessive steering is prevented, but normal steering operation is hindered
Solution Approach 1:
The control unit changes the control parameters (steering angle restriction) based on the detected banking conditions and predetermined thresholds, applying restriction only when necessary to prevent excessive steering while allowing normal steering operation under normal conditions
Data Source
AI summary
A straddled vehicle, including: a vehicle body frame; a steering device rotatably supported by the vehicle body frame; a front wheel that is steered by the steering device, to thereby change a steering angle of the front wheel; a first detection device that detects at least one of a steering angular velocity of the front wheel, an acceleration of the steering angle of the front wheel, and a steering torque of the front wheel; a posture detection device that detects a bank direction of the straddled vehicle; a restriction device that is configured to restrict a change in a steering angle of the front wheel; and a controller that causes the restriction device to restrict the change in the steering angle of the front wheel in the bank direction when a value detected by the first detection device is equal to or greater than a predetermined value.