Saddle Riding Vehicle Linkage Unlocking Control
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Solution Overview
Problem
Conventional three-wheeled vehicles with anti-roll devices unlock the linkage based solely on throttle opening degree, engine speed, or vehicle speed, which can lead to delayed unlocking when starting on a downward slope without increased throttle or engine speed, potentially causing the vehicle to start without proper linkage operation.
Innovation Solution
Incorporating a vehicle speed change rate detector and controller that unlocks the linkage when the vehicle speed change rate meets a prescribed condition, allowing earlier unlocking than conventional methods, even if the vehicle starts without increasing throttle opening degree or engine speed, and locking the linkage when the vehicle speed, throttle opening degree, and speed change rate satisfy specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle speed threshold is set to a relatively large value to prevent unlocking while the rider walks the vehicle, then the linkage remains locked during walking, but the linkage is not unlocked until the vehicle speed reaches the threshold when starting on a downward slope without increasing throttle or engine speed
Solution Approach 1:
The system performs preliminary detection of vehicle start conditions by monitoring vehicle speed change rate before the vehicle speed reaches the unlocking threshold. When the vehicle speed change rate exceeds the threshold, the controller proactively unlocks the linkage in advance, rather than waiting for the vehicle speed to reach the predefined threshold value.
Solution Approach 2:
The system dynamically adjusts the unlocking decision by considering both vehicle speed and vehicle speed change rate. Instead of using a fixed speed threshold, the controller evaluates the rate of change of vehicle speed to determine whether to unlock, allowing the system to adapt to different starting conditions such as downward slopes where speed increases without throttle input.
2Stability of the object's composition
If the linkage is locked to prevent roll motion during operation, then the vehicle stability is improved, but the linkage operation is restricted when the vehicle needs to start or change direction
Solution Approach 1:
The controller continuously monitors vehicle operating conditions including vehicle speed, vehicle speed change rate, and throttle opening degree. Based on this feedback, the controller automatically decides whether to lock or unlock the linkage, ensuring stability during normal operation and enabling smooth operation during start or direction change maneuvers.
Solution Approach 2:
The system changes the control parameter from a single vehicle speed threshold to a combination of vehicle speed, vehicle speed change rate, and throttle opening degree. This multi-parameter approach allows the system to distinguish between different operational states more accurately, maintaining stability when needed and enabling operation when appropriate.
Data Source
AI summary
A saddle riding type vehicle includes left and right front wheels that unlock a linkage more surely when the vehicle starts. The vehicle includes a linkage that connects the left and right front wheels to a vehicle body frame, a lock that locks or unlocks the linkage, a lock controller that controls the lock, a wheel speed sensor that detects a vehicle speed, and a vehicle speed change rate obtainer that obtains a vehicle speed change rate. The lock controller unlocks the linkage via the lock if the linkage is locked by the lock and at least one of the vehicle speed and the vehicle speed change rate satisfies an unlocking condition.