Brake Pad Thickness Detection Using Non-Contact Dual Sensors
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Solution Overview
Problem
Existing motor vehicle brake pad detection methods are inadequate for prompt and precise wear assessment, leading to safety risks and increased costs due to the need for frequent replacement of sensors as they wear out with the brake pads.
Innovation Solution
A dual detection system using Hall or capacitive sensors positioned between the brake pad and the fixing part, and on the brake disc, which measures brake pad thickness without direct contact, allowing for continuous accurate monitoring and reducing replacement costs by avoiding sensor wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a displacement sensor acquisition head is used to detect brake pad wear by contact, then the detection method can acquire brake pad thickness information, but the sensor acquisition head will be worn as the brake pad is worn, requiring frequent replacement and increasing detection costs
Solution Approach 1:
The patent introduces an intermediary magnetic field detection mechanism between the brake pad and sensor. The brake pad is equipped with a magnetic wear indicator that interacts with the sensor through magnetic field coupling, allowing non-contact measurement. This intermediary magnetic field transmission enables the sensor to detect brake pad wear without direct mechanical contact, eliminating sensor wear while maintaining measurement precision.
Solution Approach 2:
The patent replaces the mechanical contact-based displacement sensor system with a magnetic field-based detection system. Instead of using mechanical contact to measure brake pad thickness, the system uses magnetic sensors to detect the position and wear state of a magnetic indicator on the brake pad. This substitution of mechanical measurement with magnetic field measurement eliminates the wear problem while maintaining detection accuracy.
2Loss of time
If a contact-based displacement sensor is used to detect brake pad wear, then the detection system can issue alarm signals when wear reaches defined thickness, but the detection cannot be performed promptly and continuously throughout the braking process
Solution Approach 1:
The patent enables continuous detection of brake pad wear by positioning the magnetic sensor to detect the magnetic indicator throughout the entire braking process. As the brake pad moves during braking, the magnetic field interaction continues uninterrupted, allowing the system to continuously monitor wear in real-time rather than only at discrete contact points. This continuous detection provides timely warning signals while maintaining accurate wear measurement throughout the braking cycle.
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 system provides precise and continuous brake pad thickness monitoring, enhancing safety by alerting drivers to replace worn pads and reducing detection costs through non-contact sensor operation.
Implementation Method 1
The first brake pad thickness detector and the second brake pad thickness detector are Hall sensors or capacitive sensors
Implementation Method 2
The first brake pad thickness detector and the second brake pad thickness detector are Hall sensors or capacitive sensors
Data Source
AI summary
A motor vehicle brake pad thickness detection system comprising a brake disc, a brake pad, a brake caliper and a brake pad driving means, the brake caliper having a fixing part, and the brake pad being fixed to the fixing part. A first brake pad thickness detector is provided between the brake pad and the fixing part, and a second brake pad thickness detector is provided on the brake disc in a position corresponding to the first brake pad thickness detector. The safety of the braking system is greatly improved due to the fact that the brake pad thickness detection system detects the thickness of the brake pad precisely each time braking is performed.