Motorcycle Front-Brake Control for Rear Wheel Lift-Off Prevention
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Solution Overview
Problem
Single-track motor vehicles, such as motorcycles, face challenges in preventing flip-over during braking, as existing methods do not effectively assess and mitigate the risk of rear wheel lift-off and subsequent flip-over hazards.
Innovation Solution
A method that calculates a lift-off indicator parameter based on pitch angle, pitch angle velocity, and float angle of the rear wheel, reducing the braking force at the front wheel to prevent flip-over, utilizing an anti-lock braking system (ABS) with a control unit to assess and adjust braking forces dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If braking force at the front wheel is increased to improve stopping performance, then braking efficiency is improved, but the risk of rear wheel lift-off and flip-over increases
Solution Approach 1:
The system performs preliminary assessment of flip-over risk by calculating a lift-off indicator parameter before actual flip-over occurs. This parameter combines pitch angle, pitch angle velocity, and float angle to predict potential instability, allowing the control unit to proactively reduce braking force before the rear wheel lifts off, thus preventing the harmful effect while maintaining braking effectiveness
Solution Approach 2:
The system continuously monitors vehicle dynamics parameters (pitch angle, pitch angle velocity, float angle) and uses this feedback to dynamically adjust the braking force. The lift-off indicator parameter serves as a feedback signal that informs the control unit when to modulate braking force, creating a closed-loop control system that balances braking efficiency with vehicle stability
2Reliability
If braking force is reduced to prevent flip-over, then vehicle stability is improved, but braking distance increases
Solution Approach 1:
The system applies partial braking force reduction only when necessary - specifically when the lift-off indicator parameter indicates imminent flip-over risk. Rather than continuously reducing braking force, the system maintains full braking force during normal conditions and applies selective, partial reduction only in critical situations, thus minimizing the impact on braking distance while still preventing flip-over
Solution Approach 2:
The braking force is dynamically adjusted based on real-time vehicle conditions rather than being statically reduced. The control unit continuously evaluates the lift-off indicator parameter and modulates braking force accordingly, allowing the system to maintain optimal braking performance during stable conditions while preventing flip-over during unstable conditions
Data Source
AI summary
A method for preventing a forward flip-over or a flip-over about the vehicle transverse axis of a single-track motor vehicle, during a braking action of its front wheel. In the method, a lift-off indicator parameter is ascertained, which represents the flip-over hazard by a rear wheel at risk of lifting off or already having lifted off the ground surface, and the braking force at the front wheel is reduced as a function thereof to prevent a flip-over.