Motorcycle Braking System Dynamic Force Distribution Control
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Solution Overview
Problem
Conventional motorcycle braking systems with association mechanisms often lead to pitching due to uneven braking force distribution between the front and rear wheels, particularly when the braking force distribution curve deviates from the ideal distribution curve.
Innovation Solution
A braking system for a motorcycle that includes independent hydraulic pressure supply mechanisms for the front and rear wheels, an association mechanism that controls hydraulic pressure distribution based on the operation amount of the first operation member, and a control unit that adjusts the braking force distribution ratio to prevent pitching by varying the hydraulic pressure supplied to the second braking force generating mechanism according to vehicle speed and operation amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the association mechanism is driven to generate braking force for both front and rear wheels when the rear wheel operation member is operated, then the braking force distribution curve becomes analogous to the ideal braking force distribution curve, but pitching is prone to occur in the motorcycle
Solution Approach 1:
The patent changes the parameter of braking force distribution by introducing a switching mechanism that selects between first and second distribution ratios based on vehicle speed. At low speeds, the system uses a braking force distribution that prevents pitching, while at high speeds, it uses a distribution that follows the ideal curve for optimal braking performance. This dynamic parameter adjustment resolves the contradiction between achieving ideal braking distribution and preventing pitching.
2Reliability
If the braking force distribution follows the ideal braking force distribution curve, then the front and rear wheels are less prone to be brought into the locked state, but the association mechanism is driven at the same time when the rear wheel operation member is operated causing pitching
Solution Approach 1:
The patent applies dynamics by making the braking force distribution ratio variable rather than fixed. The switching mechanism dynamically adjusts the distribution ratio based on vehicle speed detection, transitioning between different braking force distribution characteristics. This dynamic adjustment allows the system to prevent wheel locking at high speeds while avoiding pitching at low speeds, resolving the contradiction between these two requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents pitching by ensuring that the rider feels minimal discomfort across various vehicle speeds by adjusting the operation amount and hydraulic pressure distribution, maintaining a stable braking force and reducing the likelihood of the front wheel locking before the rear wheel.
Implementation Method 1
a first hydraulic pressure supply mechanism (40a, 60) that supplies hydraulic pressure to the first braking force generating mechanism (35, 36a)
Data Source
Figure 1
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Figure 3
AI summary
When an operation amount of a first operation member (18) is smaller than a predetermined operation amount, the control unit (28) causes an association mechanism (22) not to supply hydraulic pressure to a second braking force generating mechanism (36). When the operation amount of the first operation member (18) is equal to or higher than the predetermined operation amount, the control unit (28) causes the association mechanism (22) to supply hydraulic pressure to the second braking force generating mechanism (36).