Brake Control Logic for Auxiliary Braking Noise Reduction
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Solution Overview
Problem
Existing brake control devices operate the actuator frequently to generate auxiliary braking force, leading to noise due to high frequency operation, even when the delay correlation value is within an allowable range or when the main braking force is sufficient.
Innovation Solution
A brake control device with a determination unit that assesses the delay correlation value and a control unit that reduces or eliminates auxiliary braking force when it is within the allowable range, thereby minimizing actuator operation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the actuator operates at high frequency to generate auxiliary braking force, then braking responsiveness is improved, but operating noise increases
Solution Approach 1:
The control unit dynamically adjusts the auxiliary braking force based on the delay correlation value parameter. When the delay correlation value indicates acceptable response delay, the auxiliary braking force is reduced or eliminated, thereby reducing actuator operation frequency and noise while maintaining adequate braking performance
Solution Approach 2:
Instead of always providing full auxiliary braking force when braking force shortage is detected, the system provides partial or zero auxiliary braking force when the delay correlation value is within the allowable range, achieving adequate braking with reduced actuator operation
2Reliability
If the second braking unit generates auxiliary braking force whenever main braking force is insufficient, then target braking force is achieved, but actuator operation frequency increases
Solution Approach 1:
The system uses the delay correlation value as a dynamic parameter to determine the level of auxiliary braking force. When the delay correlation value is within the allowable range, the auxiliary braking force is reduced or eliminated, reducing actuator operation frequency while maintaining reliable braking force achievement
Data Source
AI summary
A brake control device includes a first braking unit and a second braking unit for applying braking force to wheels of a vehicle. The second braking unit generates auxiliary braking force when actual braking force generated by the first braking unit is short by a predetermined amount. This brake control device includes a determination unit that determines whether a delay correlation value correlated with response delay of the actual braking force is within an allowable range when the auxiliary braking force is generated, and a control unit that executes auxiliary reduction control for reducing the auxiliary braking force when the determination unit determines that the delay correlation value is within the allowable range.