Brake Creep Groan Noise Control via Adaptive Pressure Modulation
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Solution Overview
Problem
Brake creep groan noise is generated when the vehicle starts to move from a stopped condition due to vibrations between the brake friction pads and the mating brake surface, which is undesirable and can be perceived by vehicle occupants.
Innovation Solution
A system and method for controlling the braking system to avoid brake creep groan noise by monitoring for an upper target pressure condition associated with a noise zone and controlling the inlet and outlet valves in the conduit system to avoid brake pressures that generate noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake pressure is increased to improve braking performance, then the braking force is improved, but brake creep groan noise is generated
Solution Approach 1:
The patent applies dynamics by making the brake pressure control adaptive and time-varying. The controller dynamically adjusts the brake pressure based on real-time detection of groan noise conditions, transitioning between different pressure control modes (normal mode and groan avoidance mode) to optimize both braking performance and noise reduction throughout the braking process
Solution Approach 2:
The patent changes the brake pressure parameter dynamically based on detected conditions. When groan noise is detected, the system modifies the pressure parameter by preventing it from entering the groan generation range, thus changing the pressure profile to avoid the harmful noise while maintaining effective braking
2Object-generated harmful factors
If the brake pressure is reduced to avoid groan noise, then the brake creep groan noise is reduced, but the braking performance deteriorates
Solution Approach 1:
The system dynamically switches between normal braking mode and groan avoidance mode based on real-time noise detection. During groan conditions, pressure is temporarily adjusted to avoid the noise generation range, then returns to normal pressure control when groan ceases, maintaining optimal braking performance throughout
Solution Approach 2:
The controller proactively prevents brake pressure from entering the groan generation range by detecting upper target pressure conditions associated with noise zones and adjusting pressure before groan occurs, rather than reacting after noise is generated
3Object-generated harmful factors
If the physical elements of the vehicle are changed to eliminate groan noise, then the brake creep groan noise is reduced, but the device complexity increases
Solution Approach 1:
The patent replaces potential mechanical modifications (such as changing friction materials or brake component designs) with an electronic control system that uses sensors and a controller to detect and manage groan conditions through pressure regulation, avoiding physical changes to the brake hardware
Solution Approach 2:
The controller acts as an intermediary between the brake actuator and the hydraulic pressure system, using inlet and outlet valves to mediate pressure delivery and release, thereby eliminating groan noise without modifying the fundamental mechanical brake components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces brake creep groan noise without changing the physical elements of the vehicle, ensuring a quieter and more comfortable driving experience.
Implementation Method 1
Braking generally involves using friction to avert movement
Implementation Method 2
A controller is provided to monitor for an upper target pressure condition in the system
Implementation Method 3
An inlet valve in the conduit system controls a fluid pressure delivered to the brake actuator. An outlet valve in the conduit system controls the fluid pressure released from the brake actuator
Data Source
AI summary
Methods and systems are provided for controlling braking to avoid groan noise in a braking system. The system has a brake actuator configured to apply a friction force to a moving member, a conduit system coupled with the brake actuator, an inlet valve in the conduit system configured to control fluid pressure delivered to the brake actuator, and an outlet valve in the conduit system configured to control fluid pressure released from the brake actuator. The system includes a controller to monitor for an upper target pressure condition in the braking system, wherein the upper target pressure condition is associated with a noise zone; and operate, when the upper target pressure is detected and in a noise zone avoidance mode, the inlet valve and the outlet valve to avoid brake pressures that generate a brake noise from the friction force.