Brake Controller Adjusting Slip Ratio for Gradual Deceleration
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Solution Overview
Problem
Conventional anti-lock brake controllers cause discomfort to users by incorrectly recognizing locking or possible locking of wheels during non-rapid deceleration, leading to unnecessary slippage and instability due to assumptions about typical vehicle characteristics.
Innovation Solution
A controller with an operation state determination section, slippage degree acquisition section, and target setting section that adjusts braking force based on user intent, reducing unnecessary slippage by setting a lower target for slippage degree during gradual deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conventional controller executes anti-lock brake control based on assumed typical vehicle characteristics, then the braking distance is shortened and wheel locking is suppressed, but the user experiences discomfort and unnecessary tire slippage occurs during non-rapid deceleration
Solution Approach 1:
The controller dynamically adjusts the braking control strategy based on the detected operation state. When rapid deceleration is detected, anti-lock brake control is executed to maximize braking efficiency. When gradual deceleration is detected, the control is modified to prevent unnecessary wheel locking and tire slippage, thereby improving user comfort while maintaining braking performance when needed.
Solution Approach 2:
The controller changes the control parameters based on the operation state determination. For rapid deceleration, the controller allows higher slip ratios and more aggressive braking force modulation. For gradual deceleration, the controller reduces the slip ratio target and smoothing the braking force changes, preventing the harmful effects of unnecessary anti-lock control activation.
2Reliability
If the conventional controller generates high degree of wheel slippage to maximize friction coefficient, then the braking force is optimized under typical characteristics, but the tire enters a state where unnecessary sideslip is likely to occur
Solution Approach 1:
The controller dynamically adjusts the target slip ratio based on the operation state. During rapid deceleration, the target slip ratio is set to optimize braking force by maximizing the friction coefficient. During gradual deceleration, the target slip ratio is reduced to prevent excessive tire slippage and maintain vehicle stability, thereby adapting the braking strategy to the current driving conditions.
Solution Approach 2:
The controller changes the slip ratio parameter and braking force modulation characteristics based on the detected operation state. For rapid deceleration, parameters are optimized for maximum braking efficiency. For gradual deceleration, parameters are adjusted to maintain lower slip ratios, preventing tire sideslip and maintaining vehicle stability while still providing effective braking control.
Data Source
AI summary
A controller and a control method capable of improving stability of a vehicle while improving usability of a brake system by a user.The controller includes: an operation state determination section determining an operation state of the brake system by the user; a slippage degree acquisition section acquiring a degree of slippage of a wheel; a target setting section setting a target of the degree of the slippage; and a braking force control execution section increasing or decreasing a braking force generated on the wheel on the basis of a comparison result between the degree of the slippage and the target in the case where the operation state determination section determines that the operation state is an operation state to instruct gradual deceleration.