Motorcycle Transmission Gear Shift Control via Roll Angle
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Solution Overview
Problem
The existing motorcycle transmission control system fails to allow gear shifting up when transitioning from winding driving to straight driving, as both roll and steering angular velocities exceed reference values, making it difficult for the driver to accelerate as desired.
Innovation Solution
A motorcycle equipped with a transmission, first and second measuring units to measure roll angle and angular velocity, and a controller that inhibits gear shifting based on these measurements, allowing shifting when the vehicle returns to a neutral position, thereby enabling immediate acceleration after winding driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the transmission control system inhibits shifting gears based on both roll angular velocity and steering angular velocity exceeding reference values, then smooth turn movement can be performed, but the driver cannot accelerate immediately when transitioning from winding driving to straight driving
Solution Approach 1:
The patent segments the gear shift control into different modes based on vehicle state: a first control mode that inhibits shifting during cornering (when both roll and steering angular velocities exceed thresholds), and a second control mode that allows shifting when transitioning to straight driving (when steering angular velocity is below threshold). This segmentation resolves the contradiction by applying different control strategies to different driving scenarios.
Solution Approach 2:
The patent dynamically switches between different gear shift control strategies based on real-time detection of vehicle state parameters (roll angular velocity and steering angular velocity). The control system transitions from an inhibited state during cornering to an allowed state when straightening, enabling adaptive response that maintains stability during cornering while allowing acceleration when transitioning to straight driving.
2Stability of the object's composition
If the transmission control system uses both roll angular velocity and steering angular velocity thresholds to inhibit shifting, then smooth turn movement is achieved, but gear shift control lacks detailed response to vehicle body state
Solution Approach 1:
The patent segments gear shift control into distinct modes (first control mode for cornering, second control mode for straight driving transition) based on combinations of roll angular velocity and steering angular velocity thresholds. This enables detailed response to different vehicle body states while maintaining stability during cornering.
Solution Approach 2:
The control system continuously monitors and detects vehicle body state parameters (roll angular velocity and steering angular velocity) and uses this feedback to dynamically adjust gear shift control behavior. This feedback mechanism enables detailed response to varying vehicle body states while maintaining stable cornering performance.
Data Source
AI summary
A motorcycle includes a transmission, a first measuring unit, a second measuring unit, and a controller. The transmission is configured to automatically shift gears between a driving shaft and a driven shaft to transmit power from the driving shaft to the driven shaft. The first measuring unit is configured to measure the magnitude of a roll angle of a vehicle body. The second measuring unit is configured to measure the angular velocity of the roll angle of the vehicle body. The controller is configured to inhibit the transmission from shifting gears, based on the magnitude and the angular velocity of the roll angle. This configuration provides a motorcycle that enables gear shift control with more detailed response to a situation of a vehicle body.