Motorcycle Front Brake Pressure Control for Pitch Suppression
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Solution Overview
Problem
Conventional brake systems for saddled vehicles experience a front-dropping posture when increasing brake fluid pressure, leading to driver insecurity due to rapid vehicle speed changes.
Innovation Solution
A brake system with a control device that adjusts brake fluid pressure based on pitch angular velocity and includes sensors to detect the driver's seated state and road surface conditions, reducing the increase in brake fluid pressure or maintaining it when the vehicle approaches a predetermined threshold, thereby slowing the transition to a front-dropping posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake fluid pressure of the front-wheel brake is increased to apply the target braking force, then the braking force is improved, but the vehicle body drops on the front side rapidly causing driver insecurity
Solution Approach 1:
The patent applies dynamics by making the brake fluid pressure increase rate variable rather than constant. The control device adjusts the increase rate based on detected pitch angular velocity, slowing down the pressure increase when the vehicle approaches a front-dropping posture. This dynamic adjustment resolves the contradiction by maintaining necessary braking force while preventing rapid front-dropping that causes driver insecurity.
Solution Approach 2:
The patent implements feedback control by using pitch angular velocity detection to monitor vehicle posture during brake application. The detected pitch angular velocity is fed back to the control device, which then adjusts the brake fluid pressure increase rate accordingly. This closed-loop feedback mechanism ensures that braking force is applied effectively while preventing excessive front-dropping that would compromise driver security.
2Object-affected harmful factors
If the pitch angular velocity threshold is reduced to advance the timing of pressure reduction, then driver security is improved, but the braking force application is delayed
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the pitch angular velocity threshold based on vehicle operating conditions such as driver presence detection and road slope. Rather than using a fixed threshold, the system modifies this critical parameter to optimize both driver security and braking response time across different operating scenarios, resolving the contradiction between early intervention and delayed braking.
Data Source
AI summary
To provide a brake system for a saddled vehicle that suppresses the speed at which the vehicle transitions to a front-dropping posture, thereby enhancing the driver's sense of security. A brake system for a saddled vehicle includes a control device exerting automatic control over a brake fluid pressure of a brake according to various information, and a pitch angular velocity detector for detecting a pitch angular velocity of the vehicle according to an output of a pitch angular velocity detection unit. When the pitch angular velocity becomes equal to or greater than a predetermined threshold value while the control device is gradually increasing the brake fluid pressure of the front-wheel brake by the automatic control, the control device reduces a degree of increase in the brake fluid pressure or maintains the brake fluid pressure at that time point.