Brake Control System Torque Hold for Low-Speed Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake noise reduction systems are costly and complex, and some methods create additional audible noises during low-speed vehicle braking, making them ineffective for reducing brake noise without increasing noise pollution.
Innovation Solution
A brake control system that includes an electronic control unit and actuator, which determines if the vehicle is traveling at low speed and if the requested braking torque is within a predetermined range, and either holds or releases the current braking torque to minimize noise by controlling the brake assembly accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If specially-designed systems and controllers are used to reduce brake noise, then brake noise is reduced, but system complexity and cost increase
Solution Approach 1:
The brake control system uses its own existing sensors and actuators to detect braking conditions and adjust braking torque accordingly. The system monitors wheel speed, braking torque requests, and current braking torque application, then uses the actuator to modify brake assembly operation without requiring external specialized noise-reduction components.
Solution Approach 2:
The existing brake control system, originally designed for general braking control, is enhanced to also perform noise reduction functions. The same electronic control unit and actuator that control normal braking operations are used to implement noise reduction by holding braking torque within specific ranges, making the system multi-functional without adding dedicated noise-reduction hardware.
2Object-affected harmful factors
If braking torque is adjusted to reduce brake noise, then brake noise is reduced, but additional audible noises may be created
Solution Approach 1:
The system changes the braking torque parameter dynamically based on operating conditions. When noise is detected during low-speed braking with light brake pressure, the controller adjusts the braking torque to hold it within a predetermined range rather than allowing it to vary freely, thereby reducing noise without creating abnormal noise conditions.
Solution Approach 2:
The system continuously monitors braking torque application and wheel speed, comparing current conditions against thresholds for low-speed light-braking scenarios. Based on this feedback, the controller determines whether to hold or release braking torque, creating a closed-loop control system that reduces noise while preventing abnormal noise generation through continuous adjustment based on actual operating conditions.
3Object-affected harmful factors
If braking torque is held during low-speed braking, then brake noise is reduced, but braking responsiveness may be degraded
Solution Approach 1:
The system dynamically adjusts braking torque based on real-time operating conditions rather than using a fixed control strategy. The controller monitors wheel speed, braking torque requests, and current braking torque application continuously, switching between holding torque (to reduce noise) and releasing torque (to maintain responsiveness) based on whether conditions fall within the predetermined range for noise reduction.
Solution Approach 2:
The controller periodically evaluates whether current operating conditions warrant noise reduction intervention by checking if the vehicle is in a low-speed light-braking scenario. The braking torque is held only during specific periodic intervals when noise reduction is beneficial, and released when normal braking responsiveness is needed, creating a rhythm of control actions that balances noise reduction with responsiveness.
Data Source
AI summary
A mechanism for reducing brake noise during braking of a vehicle. The mechanism includes controllers and methods that “hold” a currently applied braking torque rather than applying the operator-requested braking torque when a vehicle is traveling at a low speed and the operator-requested braking torque is within a predetermined range. The controllers and methods “release” the previously “held” braking torque and apply the operator-requested braking torque once the operator-requested braking torque is outside the predetermined range.