Vehicular Brake Control System for Motorcycle
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Solution Overview
Problem
Conventional brake control systems for vehicles, such as motorcycles, cause uncomfortable riding experiences due to temporary increases in rear wheel brake force during brake release, impairing the riding feel.
Innovation Solution
A brake control system that interlockingly controls the brake forces of the front and rear wheels using a control unit to decrease both brake forces at a predetermined ratio when one brake operating member is loosened, preventing temporary increases in rear wheel brake force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interlocking brake control is performed according to the ideal brake force distribution curve, then braking efficiency is improved, but uncomfortable riding feeling occurs during brake release
Solution Approach 1:
The control unit dynamically switches between two control modes: interlocking brake control during brake application, and decreasing control during brake release. This dynamic adaptation resolves the contradiction by applying different control strategies appropriate to each phase of brake operation, maintaining both braking efficiency and comfortable riding feeling.
Solution Approach 2:
The system changes the control parameters based on the brake operation phase. During brake release, the control unit prioritizes decreasing the brake force of the operated wheel over maintaining the distribution ratio, thereby changing from interlocking control parameters to decreasing control parameters. This parameter change eliminates the temporary rear wheel brake force increase while preserving the benefits of interlocking control during application.
2Stability of the object's composition
If decompression control follows the ideal brake force distribution curve during brake release, then brake force coordination is maintained, but rear wheel brake force temporarily increases
Solution Approach 1:
The control unit applies preliminary anti-action by detecting the brake release state and immediately switching to decreasing control mode before the temporary rear wheel brake force increase can occur. This preemptive action prevents the harmful phenomenon by prioritizing the decrease of the operated wheel's brake force, thereby avoiding the coordination issue that would otherwise cause rear wheel brake force to temporarily increase.
3Stability of the object's composition
If the brake force of one wheel is decreased while the other is increased according to distribution ratio, then braking balance is maintained, but rider comfort deteriorates during release
Solution Approach 1:
The control system dynamically adapts its behavior based on the brake operation phase. During brake release, it transitions from maintaining brake force balance through interlocking control to prioritizing the decrease of the operated wheel's brake force. This dynamic adjustment eliminates the temporary rear wheel brake force increase that causes rider discomfort, while preserving braking balance during application phases.
Data Source
AI summary
A brake control system includes at least a pair of brake systems respectively connected to a pair of brake operating members L1, L2, and a control unit 10 for controlling the brake forces of the pair of brake systems interlockingly according to a predetermined distribution ratio by operating one of the pair of brake operating members L1, L2. The control unit 10 executes a decreasing control on the brake forces in such a manner that, when releasing the pair of brake operating members L1, L2, the control unit 10 decreases both of the brake forces together, even in a state where the control unit performs the interlocking control so as to decrease the brake force of one of the brake system as the brake force of the other of the brake system is increased in accordance with the predetermined distribution ratio.