Motorcycle Brake Controller Speed Correction Logic
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Solution Overview
Problem
Conventional motorcycle brake systems face difficulties in generating appropriate braking force due to discrepancies between estimated and actual vehicle body speeds, particularly during wheel lock or potential lock conditions, leading to delayed reduction in braking force.
Innovation Solution
A controller that includes an estimated vehicle body speed obtainment section, a corrected vehicle body speed obtainment section, and a braking force control execution section, which corrects the actual vehicle body speed to a low-speed side and adjusts the braking force based on the corrected speed to optimize braking force generation during deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the estimated vehicle body speed is used for braking force control, then the braking force can be generated based on wheel speed information, but the difference between estimated and actual vehicle body speed increases during wheel lock or potential lock, leading to delayed initiation of braking force reduction
Solution Approach 1:
The patent introduces a corrected vehicle body speed as an intermediary parameter between the estimated vehicle body speed (from wheel speed sensors) and the actual vehicle body speed. This corrected speed, obtained by correcting the actually-measured vehicle body speed to a low-speed side, serves as a mediator that provides more accurate speed information for braking force control during wheel lock conditions, thereby resolving the contradiction between control reliability and measurement precision
Solution Approach 2:
The patent changes the parameter used for braking force control from the estimated vehicle body speed to the corrected vehicle body speed. By correcting the actually-measured vehicle body speed to account for wheel lock conditions, the system achieves more accurate speed measurement, thereby improving both braking force control reliability and measurement precision simultaneously
2Productivity
If the estimated vehicle body speed is used during deceleration, then the braking force control can be implemented, but the slip rate of the wheel is underestimated when the wheel is locked or possibly locked, delaying the operation to reduce braking force
Solution Approach 1:
The patent implements feedback by comparing the estimated vehicle body speed with the corrected vehicle body speed. When the estimated speed is lower than the corrected speed (indicating wheel lock or potential lock), the system detects this discrepancy and adjusts the braking force accordingly. This feedback mechanism ensures timely detection of wheel lock conditions and appropriate response, improving both response speed and slip rate measurement precision
Solution Approach 2:
The patent performs preliminary correction of the actually-measured vehicle body speed to obtain the corrected vehicle body speed before using it for braking force control. This preliminary action of correcting the speed measurement ensures that the subsequent braking force control is based on accurate speed information, preventing underestimation of slip rate and enabling timely braking force reduction
Data Source
AI summary
A controller and a control method capable of optimizing a braking force generated by a brake system are obtained. During deceleration of a motorcycle, the controller and the control method according to the invention obtain an estimated vehicle body speed Vbe of the motorcycle that is estimated on the basis of speed information of a wheel, obtain a corrected vehicle body speed Vbc that is obtained by correcting an actually-measured vehicle body speed of the motorcycle to a low-speed side, cause the brake system to generate the braking force that corresponds to the estimated vehicle body speed Vbe in a state where the estimated vehicle body speed Vbe is higher than the corrected vehicle body speed Vbc, and cause the brake system to generate the braking force that corresponds to the corrected vehicle body speed Vbc in a state where the estimated vehicle body speed Vbe is lower than the corrected vehicle body speed Vbc.