Brake Force Distribution Control for Two-Wheeled Vehicle Wheelie Prevention
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Solution Overview
Problem
The combined brake system for two-wheeled vehicles fails to adjust braking force distribution appropriately when the vehicle is inclined while traveling on a curve, leading to wheelie occurrences due to equal braking force distribution as in upright conditions, making it difficult for riders to control the vehicle.
Innovation Solution
A method and device that detect the lean angle of the vehicle and adjust the braking force distribution between the front and rear brake devices, decreasing the front brake's braking force when the lean angle exceeds a specified value to prevent wheelie, with configurations that include changing the distribution based on lean angle, initiating changes during braking operations, and terminating adjustments when the vehicle returns to an upright state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the combined brake system distributes equal braking force to front and rear brake devices during curve travel, then the braking performance during straight travel is maintained, but wheelie occurs making the vehicle unstable
Solution Approach 1:
The brake control device dynamically adjusts the braking force distribution between front and rear brake devices based on real-time detection of lean angle and braking operation status. When the vehicle is in a leaned state during curve travel, the system automatically reduces front brake force while maintaining rear brake force, preventing wheelie and improving rideability without sacrificing stability
Solution Approach 2:
The system continuously monitors the lean angle through detection devices and uses this feedback information to control the braking force distribution. The control device receives lean angle information and braking operation information, then adjusts the braking force accordingly, creating a closed-loop control system that adapts to changing vehicle states
2Adaptability or versatility
If the braking force distribution is fixed for upright travel conditions, then the brake system is simple to control, but it cannot adapt to leaned states during curve travel
Solution Approach 1:
The system replaces complex mechanical linkage for brake force distribution with an electronic control system. The control device uses electronic signals to adjust braking force based on lean angle detection, eliminating the need for complex mechanical adjustments while achieving adaptive braking distribution across different travel conditions
Solution Approach 2:
The brake control device serves multiple functions: it monitors lean angle, detects braking operations, controls braking force distribution, and prevents wheelie. This multi-functional approach allows a single control system to handle various travel conditions (straight and curved, leaned and upright) without requiring separate control mechanisms for each scenario
Data Source
AI summary
To provide braking-force control capable of suppressing a wheelie of a two-wheeled vehicle by changing braking-force distribution.In a method for controlling a braking force of a combined brake system for the two-wheeled vehicle, a lean angle of a two-wheeled vehicle 1 is detected or computed, and, in the case where the lean angle exceeds a specified value, braking-force distribution to front and rear brake devices 11f, 11r is changed.