Motorcycle Brake Control Device for Turning Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Motorcycle riders experience discomfort due to external forces acting on the handlebars during braking while turning, as existing brake control systems primarily focus on slip prevention, leading to unstable braking and reduced safety.
Innovation Solution
A brake control device that includes a deceleration estimating unit, bank angle estimating unit, and slip preventing unit, which controls brake fluid pressure to limit deceleration based on bank angle, switching to slip prevention when necessary, and prioritizing front wheel deceleration control to minimize rider discomfort and ensure stable braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake control is performed to limit slip to a predetermined range during turning, then wheel slip is prevented, but the rider experiences discomfort due to external force acting on the handlebars
Solution Approach 1:
The deceleration limiting unit activates before the slip preventing unit when turning is detected. By preliminarily limiting deceleration based on bank angle before slip occurs, the system prevents the sudden external forces that cause rider discomfort, while still maintaining the ability to prevent slip if needed
2Reliability
If brake fluid pressure is controlled to prevent slip, then wheel slip is limited, but the external force effect on handlebars increases during turning
Solution Approach 1:
The system applies different brake control strategies to different wheels based on local conditions. The deceleration limiting unit primarily controls the front wheel brake pressure during turning, while the slip preventing unit controls both wheels. This localized approach reduces handlebar forces while maintaining overall brake stability
3Ease of operation
If deceleration limiting is applied at all bank angles, then rider comfort is maintained, but braking performance is reduced when not turning
Solution Approach 1:
The brake control system dynamically switches between deceleration limiting and slip prevention modes based on real-time detection of turning state (bank angle). When not turning, the system uses conventional slip prevention for optimal braking performance. When turning is detected, it transitions to deceleration limiting to maintain comfort, demonstrating adaptive behavior
Data Source
AI summary
In this brake control device for a motorcycle, a deceleration threshold value calculation unit limits target wheel deceleration to a threshold value or less on the basis of a bank angle estimated by a bank angle calculation unit. Thus, the behavior of the vehicle body during turning of the motorcycle can be made more stable so as not to cause discomfort to a driver.