Motorcycle Brake Control Device for Hydraulic Pressure Distribution
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Solution Overview
Problem
Existing interlock braking systems for motorcycles lack integration of target braking force control for both rear and front wheel brakes, leading to independent control and suboptimal brake feeling, with a focus on suppressing early ABS operation rather than enhancing brake sensation.
Innovation Solution
A brake control device that connects the rear wheel brake operation element with the front wheel brake through a flow passage, using detection portions to set a target hydraulic pressure difference based on vehicle speed, allowing the control unit to regulate the hydraulic pressure and improve brake feeling by fine-tuning braking force distribution between the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front wheel brake is controlled independently of the rear wheel brake, then the control system is simple, but the brake feeling is suboptimal
Solution Approach 1:
The patent merges the control of front and rear wheel brakes into a unified interlock braking system. The control unit integrates target braking force information from both wheels and coordinates their operation through a hydraulic circuit, allowing the rider to operate a single brake lever while both brakes work together harmoniously, significantly improving brake feeling and coordination.
Solution Approach 2:
The brake control system is designed to perform multiple functions: it controls both front and rear wheel brakes, provides ABS functionality for both wheels, and automatically coordinates braking force distribution. This multi-functional design allows a single control system to optimize braking performance across different operating conditions without requiring separate control mechanisms.
2Productivity
If the target braking force information is used only for rear wheel brake control, then the control logic is simple, but the overall braking efficiency is reduced
Solution Approach 1:
The control unit implements feedback mechanisms by continuously monitoring braking force information from both front and rear wheel pressure sensors. It uses this feedback to dynamically adjust the target braking force distribution, compare actual braking forces with target values, and make real-time corrections to optimize braking efficiency while preventing wheel lockup.
Solution Approach 2:
The braking control system dynamically adjusts the target braking force for each wheel based on real-time conditions including vehicle speed, brake lever operation force, and individual wheel response characteristics. This dynamic adjustment allows the system to optimize braking efficiency across varying operating conditions rather than using fixed braking ratios.
3Ease of operation
If the brake control focuses on suppressing early ABS operation, then the system responds conservatively, but the brake feeling and responsiveness are not optimized
Solution Approach 1:
The control unit dynamically changes critical parameters including target braking force, pressure control thresholds, and ABS activation criteria based on vehicle speed, brake operation intensity, and wheel deceleration rates. This parameter adaptation allows the system to provide responsive brake feeling during normal operation while maintaining stability and preventing premature or inappropriate ABS activation.
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 solution enhances brake feeling by allowing precise control of the front wheel brake based on rear wheel brake operation, improving braking efficiency at higher speeds and stability at lower speeds, while reducing the need for additional pressure sensors and simplifying the system structure.
Implementation Method 1
a master cylinder (152) for generating hydraulic pressure according to operation of the rear wheel brake operation element (21)
Implementation Method 2
an opening regulating valve (171) for regulating an opening of the flow passage (170)
Data Source
AI summary
The pressure sensor functions as a first detection portion for detecting hydraulic pressure set according to operation of a brake pedal. The control unit detects the hydraulic pressure acting on the second piston portion through the pipe. The control unit controls differential pressure in the detected hydraulic pressure to a target value set according to vehicle speed.