Brake Noise Control via Pressure Modulation and Frequency Detection
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Solution Overview
Problem
Existing motor-vehicles do not effectively distinguish between different types of brake noise and implement targeted interventions to address the underlying causes, leading to potential constructive complications and increased production costs.
Innovation Solution
An electronic controller processes sensor signals to differentiate between noise frequencies indicative of oxidized, deformed, or incorrectly interacting brake discs, applying pressure modulation to correct these issues without affecting other brakes' performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single noise control approach is used for all brake noise types, then the system remains simple, but it cannot effectively address different noise causes (oxidation, deformation, incorrect interaction)
Solution Approach 1:
The patent segments the noise control approach by dividing the frequency spectrum into distinct ranges (200-1500 Hz for oxidation, 1500-14000 Hz for incorrect interaction, and speed-variable periodic noise for deformation). Each frequency range triggers a specific corrective function, allowing targeted intervention for different noise causes without requiring a completely complex system architecture
Solution Approach 2:
The system changes the parameter being monitored from general noise presence to specific frequency characteristics. By analyzing the frequency spectrum and identifying which range the noise falls into, the controller can determine the underlying cause and apply the appropriate corrective pressure modulation strategy
2Object-generated harmful factors
If corrective functions are applied to remove noise causes, then noise is reduced, but braking performance may be altered
Solution Approach 1:
The patent applies local quality by implementing corrective functions specifically for the affected brake disc while maintaining normal operation of other brakes. The pressure modulation is applied selectively to the brake exhibiting noise issues, allowing noise correction without compromising the braking performance of the entire vehicle
Solution Approach 2:
The system continuously monitors brake noise through sensors and uses this feedback to activate corrective functions only when noise is detected. The corrective pressure modulation is applied dynamically based on real-time noise detection, and can be deactivated when the noise condition resolves, ensuring braking performance is maintained under normal conditions
3Measurement precision
If multiple sensors and processing functions are added to distinguish noise types, then noise identification accuracy improves, but production costs increase
Solution Approach 1:
The patent makes the existing electronic controller multi-functional by programming it to perform both normal braking control and noise analysis functions. The same controller hardware that manages brake actuation is also used to process sensor signals, identify noise types through frequency analysis, and implement corrective functions, eliminating the need for separate dedicated noise control hardware
Solution Approach 2:
The system uses the existing sensor infrastructure of the vehicle (already present for other monitoring purposes) to detect brake noise. The electronic controller leverages its existing computational capabilities to analyze the sensor data and implement noise correction, allowing the system to serve dual purposes without requiring additional dedicated 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
Effectively identifies and mitigates brake noise by correcting brake disc conditions, reducing noise without compromising braking performance or increasing production costs.
Implementation Method 1
said electronic controller is configured to process the output signals by the sensors associated with the disc brakes of the motor-vehicle in order to distinguish between: a multi-frequency noise in a frequency range of 200-1500 Hz, this noise being indicative of an oxidized brake disc, a noise in a frequency range of 1500-14000 Hz, this noise being indicative of a whistle generated by an incorrect interaction between the brake pad and the respective brake disc
Implementation Method 2
controlling the braking system, when during braking a noise due to an oxidized brake disc is detected, in such a way as to superimpose a pressure modulation to the pressure with which the brake pads are pressed against the brake disc, the pressure modulation being such as to cause a partial or total removal of a layer of oxide from this brake disc
Implementation Method 3
controlling the braking system, when during braking a whistle generated by a disc brake is detected, in such a way as to superimpose a pressure modulation to the pressure with which the brake pads are pressed against the brake disc, the pressure modulation being such as to modify the interaction between the brake disc and the brake pads of the disc brake
Implementation Method 4
controlling said braking system when, during braking, a periodic noise is detected which is variable as a function of the speed of the vehicle, this noise being indicative of a deformed brake disc, in such a way as to modulate the braking pressure on this disc, so as to reduce an emergence of vibrations that may affect the motor-vehicle
Data Source
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AI summary
The electronic controller (E) of a motor-vehicle braking system (1) is configured to receive the output signals from sensors (S1, S2, S3) associated with the brakes and suitable for detecting a noise generated by the brakes. The electronic controller (E) is configured to process the sensor signals in such a way as to distinguish between a noise indicative of an oxidized brake disc, a noise indicative of a whistle generated by an incorrect interaction between a brake pad and the respective brake disc and a periodic noise having a period which is variable as a function of the speed of the vehicle, this noise being indicative of a deformed brake disc. In the event of noise due to oxidized brake disc or whistle, the electronic controller (E) controls the braking system (1) in such a way as to superimpose a pressure modulation on the braking pressure, such as to partially or totally remove a layer of oxide from the brake disc or such as to modify the interaction between the brake disc and the brake pads, while simultaneously operating the other brakes of the vehicle in order not to alter their braking performance. If a periodic noise indicative of a deformed brake disc is detected, the electronic controller (E) modulates the braking pressure so as to reduce the occurrence of vibrations that may affect the motor-vehicle, while simultaneously operating the other brakes of the vehicle in order not to alter their braking performance.