Straddled Vehicle Steering Control via Angular Velocity Feedback
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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 steering torque control.
Innovation Solution
The straddled vehicle incorporates a detection unit to monitor steering angular velocity, acceleration, or torque, and a control unit that activates a restriction unit to limit steering angle changes when detected values exceed a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device controls steering torque based on steering angle, then the control system is simple, but it is difficult to appropriately maintain the posture of the straddled vehicle
Solution Approach 1:
The patent implements feedback control by detecting steering angular velocity and steering torque, then using this information to dynamically adjust steering torque through the actuator. The control device continuously monitors the steering operation state and adjusts the steering torque accordingly, creating a closed-loop control system that maintains appropriate vehicle posture while responding to driver inputs.
Solution Approach 2:
The patent transitions from static steering angle-based control to dynamic control by incorporating steering angular velocity detection. The system adapts the steering torque in real-time based on the detected steering angular velocity and torque, allowing the control characteristics to change dynamically according to the steering operation state rather than relying solely on fixed steering angle feedback.
2Stability of the object's composition
If the restriction unit restricts steering angle changes when detected value exceeds threshold, then posture stability is improved, but steering operability may be reduced
Solution Approach 1:
The patent changes the control parameter from static steering angle to dynamic steering angular velocity and torque. By monitoring the rate of change and magnitude of steering inputs rather than just the absolute angle, the system can distinguish between intentional steering maneuvers and unstable oscillations, applying restrictions only when necessary to maintain stability while preserving normal steering operability.
Solution Approach 2:
The restriction unit applies partial restriction by selectively limiting steering angle changes only when the detected steering angular velocity or torque exceeds predetermined thresholds. Normal steering operations below these thresholds are allowed to proceed without restriction, providing only the necessary minimum intervention to maintain vehicle posture stability while preserving driver control.
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 restriction device that is configured to restrict a change in the steering angle of the front wheel; and a controller that causes the restriction device to restrict a change in the steering angle of the front wheel when a value detected by the first detection device is equal to or greater than a predetermined value.