Brake Pad Wear Estimation Using Support Plate Thermal Sensing
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Solution Overview
Problem
Traditional vehicle brake wear sensors are complex, prone to high stress, and costly due to embedded temperature sensors that face extreme temperatures and pressures, leading to reliability issues and increased costs.
Innovation Solution
A method using a temperature sensor configured to sense the temperature of a support plate connected to an electronic processing unit, which processes temperature signals to estimate brake pad thickness, incorporating additional sensors for ambient temperature, acceleration, and force data to adjust the estimation, and employing a thermal model to correlate temperature dynamics with pad thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are embedded in the brake lining to detect wear, then wear detection capability is improved, but the sensor reliability deteriorates due to exposure to very high temperature and pressure
Solution Approach 1:
The temperature sensor is extracted from the brake lining and relocated to the brake disc. This separates the sensing function from the high-stress friction material environment, allowing the sensor to operate in a more favorable thermal environment while still detecting wear through temperature changes of the support plate
Solution Approach 2:
The support plate acts as an intermediary between the friction material wear and the temperature sensor. As the friction material wears, the thermal characteristics of the support plate change, which the sensor detects. This indirect measurement approach protects the sensor from direct exposure to extreme conditions
2Measurement precision
If embedded temperature sensors and special brake pads are used for wear detection, then wear estimation accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
The temperature sensor on the brake disc serves multiple functions: it monitors brake disc temperature for thermal management and simultaneously enables wear detection through analysis of temperature dynamics. This multi-functionality eliminates the need for separate dedicated wear sensors in the friction material
Solution Approach 2:
The brake disc itself serves as both the braking surface and the mounting platform for the temperature sensor. The support plate's inherent thermal properties are utilized for wear detection without requiring additional specialized components in the friction material assembly
3Measurement precision
If multiple sensors and complex processing algorithms are used for accurate wear estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors temperature dynamics and uses this feedback to estimate wear in real-time. The processing unit analyzes the temporal evolution of temperature data to extract wear information, creating a closed-loop monitoring system that adapts to changing brake conditions
Solution Approach 2:
The system uses ambient temperature, acceleration, and force data as additional inputs to adjust the wear estimation, but these are processed through a unified algorithm in the single processing unit rather than requiring separate dedicated systems for each parameter
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
This approach provides a reliable, real-time estimation of brake pad wear, reducing complexity and cost by leveraging temperature trends correlated with pad thickness, while enhancing sensor accuracy and durability.
Implementation Method 1
providing a temperature sensor configured and placed to sense the temperature of said support plate
Data Source
AI summary
A method of estimating wear of a vehicle brake element including at least a braking disk (10), a wearable block of friction material (20) and a support back plate (40) of the block of friction material (20), comprising at least: —providing a temperature sensor (100) configured and placed to sense the temperature of the support back plate (40) —providing an Electronic Processing Unit (200) connected to the temperature sensor (100); —providing an acquisition of the sensed temperature of the support back plate (40), a generation of a temperature signal of the sensed temperature and a transmission of the temperature signals to the Electronic Processing Unit (200); —and the Electronic Processing Unit (200) providing an estimation (500) of the thickness of the wearable block of friction material (20) by processing of the temperature signals.