Vehicle Brake Pad Noise Control via Electronic Pre-Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle brake systems generate unpleasant noises, such as reversing clicks and rattling, due to the play between brake pads and their holders, which can occur during changes in direction or when driving over uneven road surfaces, and existing solutions like springs are inadequate in preventing these noises at higher acceleration levels.
Innovation Solution
An electronic control unit detects changes in vehicle direction and uneven road surfaces, initiating a minimal, imperceptible deceleration process through sensors and measurement technology, ensuring the brake pads are slowly applied within the shaft clearance without noise, using a light braking pressure that is imperceptible to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If springs are used to prevent rattling noise, then noise prevention is improved up to a defined acceleration level, but unwanted rattling noises still occur when acceleration exceeds this level
Solution Approach 1:
The electronic control unit initiates a light braking process before the vehicle reaches high acceleration levels when driving over uneven road surfaces. This preliminary action prevents the brake pads from accelerating within the clearance and striking the caliper components, thereby preventing rattling noise before it occurs rather than just mitigating it after springs fail at high acceleration levels
2Speed
If brake pads are rapidly accelerated during braking after direction change, then braking response is improved, but loud clacking noise known as reversing clack occurs
Solution Approach 1:
The electronic control unit detects a change between forward and reverse travel and initiates a light braking process before the driver applies the brakes. This preliminary action ensures that the brake pads are already in contact with the brake disc and properly positioned, so when the driver subsequently applies the brakes, the brake pads do not slide rapidly within the clearance and produce reversing clack noise
Solution Approach 2:
The light braking process creates a preliminary counteracting force that prevents the brake pads from moving rapidly within the clearance during subsequent braking. By applying a small braking force in advance, the system counteracts the tendency of the brake pads to slide and strike the caliper components, thereby preventing the reversing clack noise while maintaining ready-to-brake conditions
3Object-affected harmful factors
If minimal deceleration is applied to prevent brake pad impact noise, then noise prevention is improved, but driver perceivability of braking remains imperceptible
Solution Approach 1:
The electronic control unit applies a light braking pressure that is sufficient to prevent brake pad impact noise but minimal enough to be imperceptible to the driver. This partial action approach uses just enough braking force to achieve the desired noise prevention effect without creating a noticeable deceleration that would interfere with the driver's perception or control of the vehicle
Data Source
Figure 1
Figure 2a~2ad
Figure 2b~2bh
AI summary
The invention relates to a method for operating a vehicle brake system, which has at least one brake pad and a friction partner interacting with the same, wherein an electronic control unit detects a state at the brake pad and/or the friction partner and, depending on the state, triggers a pressing between the brake pad and friction partner in such a way that substantially no vehicle deceleration is perceptible for a vehicle passenger. The electronic control unit thereby detects as the aforementioned state a change between forward and reverse driving and/or a vertical movement and/or a source of a future vertical movement of the vehicle wheel and/or of a vehicle body of the vehicle. Noises can be reduced in this way.