Bar-Handle Brake Pressure Holding for Stable Motorcycle Cornering
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Solution Overview
Problem
In vehicles with bar handles, such as motorcycles, existing brake control systems face instability during cornering due to inappropriate holding control of brake fluid pressure, which can lead to unnatural changes in vehicle body attitude and behavior.
Innovation Solution
A brake control device that includes a bank angle obtaining unit, a deceleration obtaining unit, and a control unit to adjust the holding control threshold value based on the bank angle, allowing for early initiation of holding control when the vehicle is cornering, thereby stabilizing the vehicle by distributing braking force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holding control is performed in the neighborhood of a pressure at which the front wheel is locked during cornering, then wheel slip is suppressed, but the bank angle of the vehicle body unnaturally changes making the behavior of the vehicle body unstable
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the holding control threshold value based on the bank angle of the vehicle. When the bank angle exceeds a predetermined threshold, the system changes the deceleration threshold for initiating holding control, thereby adapting the braking behavior to the cornering condition and preventing unnatural vehicle body attitude changes while still suppressing wheel slip.
2Stability of the object's composition
If holding control is started at a high deceleration threshold, then vehicle stability is maintained, but wheel slip cannot be suppressed effectively during cornering
Solution Approach 1:
The patent implements dynamics by making the holding control threshold value variable rather than fixed. The control threshold is dynamically adjusted based on real-time bank angle detection, allowing the system to optimize between vehicle stability and wheel slip suppression depending on the cornering severity. This dynamic adaptation enables effective wheel slip suppression during cornering while maintaining vehicle stability.
3Reliability
If the holding control threshold value is corrected to a low deceleration side when bank angle increases, then holding control starts earlier improving wheel slip suppression, but vehicle stability may be compromised
Solution Approach 1:
The patent applies feedback by continuously monitoring the bank angle and using this information to adjust the holding control threshold. The bank angle obtaining unit provides real-time feedback on vehicle attitude, and the control unit responds by correcting the threshold value appropriately. This closed-loop feedback mechanism ensures that holding control starts at the optimal moment to suppress wheel slip while maintaining vehicle stability through adaptive threshold adjustment.
Data Source
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AI summary
A brake fluid pressure control device for vehicles with bar handle which is configured to start a holding control of a fluid pressure of a wheel brake according to wheel deceleration calculated based on a wheel speed of the vehicle is provided. In the brake fluid pressure control device, the vehicle includes an acceleration sensor which is configured to detect acceleration in a front-rear direction of the vehicle, acceleration, detected by the acceleration sensor, which occurs in a rearward direction when the vehicle is decelerating is detected as a positive value, and the holding control is started when it is judged that the acceleration detected by the acceleration sensor is larger than or equal to a detection acceleration threshold value and the wheel deceleration is smaller than or equal to a wheel deceleration threshold value.