Brake Pad Wear Detection Using Rotor and Pressure Sensing
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Solution Overview
Problem
Existing braking systems fail to accurately and timely detect brake pad wear, leading to potential non-ideal braking situations and increased maintenance costs, as they often rely on electrical contacts or inaccurate brake fluid volume consumption measurements.
Innovation Solution
A braking system that utilizes sensors such as Hall effect sensors and pressure sensors to dynamically determine brake pad wear by measuring the volume of brake fluid in the brake piston chamber and adjusting calculations based on flow rate and pressure, allowing for real-time monitoring and alerting the driver of wear thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical contacts or brake fluid volume consumption measurements are used to detect brake pad wear, then the detection system is simple in structure, but the measurement precision is insufficient leading to inaccurate wear detection
Solution Approach 1:
The patent replaces traditional mechanical detection methods (electrical contacts) and simple volume measurements with a more sophisticated system using Hall effect sensors to detect magnetic field changes. This substitution enables more precise wear detection by measuring the position of the brake piston chamber, which changes as the brake pad wears, without requiring direct mechanical contact or complex fluid volume calculations.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the brake pad wear and the detection system. A magnet is attached to the brake piston chamber, and a Hall effect sensor detects changes in the magnetic field position as the brake pad wears. This intermediary enables indirect but accurate measurement of wear through magnetic field position changes, resolving the contradiction between simplicity and precision.
2Reliability
If traditional brake pad wear detection methods are used, then the device complexity is low, but the reliability of braking system is compromised due to delayed or inaccurate detection
Solution Approach 1:
The patent implements a feedback mechanism where the Hall effect sensor continuously monitors the magnetic field position, and this information is fed back to a controller that can detect wear thresholds and alert the driver. This feedback loop ensures reliable detection of brake pad wear conditions, enabling timely maintenance decisions and maintaining braking system reliability.
Solution Approach 2:
The system performs preliminary detection of brake pad wear conditions by continuously monitoring magnetic field position changes. By detecting wear trends before they reach critical levels, the system enables proactive maintenance scheduling, preventing non-ideal braking situations and maintaining high reliability without requiring complex real-time intervention systems.
3Productivity
If real-time monitoring of brake pad wear is implemented using sensors and pressure measurements, then the productivity of maintenance scheduling is improved, but the use of energy increases due to continuous sensor operation
Solution Approach 1:
The patent employs periodic measurement rather than truly continuous monitoring. The Hall effect sensor and pressure sensor operate at intervals or are activated based on braking events, rather than running continuously. This periodic action maintains the ability to detect wear trends and schedule maintenance efficiently while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The system leverages existing vehicle electrical systems and sensors to power the monitoring functions. The Hall effect sensor and pressure sensor utilize the vehicle's existing power infrastructure, and the system integrates with the vehicle's onboard computer for data processing and alert generation. This self-service approach minimizes additional energy requirements while maintaining high maintenance scheduling productivity.
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 solution enables proactive maintenance, reduces the risk of non-ideal braking events, and minimizes maintenance costs by providing accurate and timely notifications of brake pad wear, ensuring the vehicle's braking system remains effective and safe.
Implementation Method 1
A braking system that utilizes sensors such as Hall effect sensors and pressure sensors to dynamically determine brake pad wear
Implementation Method 2
determine a volume of brake fluid in a brake piston chamber based on a flow rate of the brake fluid and a pressure within the brake piston chamber
Data Source
AI summary
Methods and apparatus to sense brake pad wear are disclosed. An example apparatus includes at least one memory device and at least one processor to execute instructions to determine whether a braking event corresponds to an anti-lock braking event or a non-anti-lock braking event, in response to the braking event corresponding to the anti-lock braking event, determine at least one of a thickness of a brake pad or a wear of the brake pad based on at least operating parameters of a motor associated with pumping a brake fluid, and in response to the braking event corresponding to the non-anti-lock braking event, determine at least one of the thickness or the wear based on at least a first measurement from a rotary sensor operatively coupled to a brake rotor and a second measurement from a pressure sensor operatively coupled to a flow path of the brake fluid.