Brake Chamber Stroke Sensor Using Distributed Magnetic Array
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Solution Overview
Problem
Existing brake chamber sensors struggle to provide accurate measurements over the entire stroke cycle and fail to detect wear effectively, leading to inadequate maintenance scheduling and resource misallocation due to limitations in measuring stroke distance and cycle count.
Innovation Solution
A sensor assembly with a magnetic sensor and magnet configuration that detects magnetic field strength variations to determine the position of the push rod over the entire stroke distance, allowing for precise measurement and cycle counting, and a processor to analyze data for condition assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a magnetic sensor is positioned at the end of the chamber to detect a magnet on the push rod head, then the sensor structure is simple, but accurate measurements cannot be obtained when the push rod approaches maximum stroke distance
Solution Approach 1:
The patent transitions from a single-point magnetic sensor at the chamber end to a distributed array of magnetic sensors along the chamber wall. This spatial distribution in another dimension enables continuous stroke measurement across the entire range, resolving the measurement precision limitation while maintaining structural simplicity through modular sensor placement.
Solution Approach 2:
The patent divides the single magnetic sensing function into multiple segmented magnetic sensors positioned at different locations along the chamber. Each sensor covers a specific stroke range, and their combined data provides complete stroke cycle measurement, overcoming the limitation of single-point detection.
2Ease of operation
If maintenance schedules are set at predetermined time intervals, then inspection planning is simple, but wear levels may go undetected before regular maintenance or resources may be wasted on unnecessary inspections
Solution Approach 1:
The patent implements real-time feedback through continuous stroke cycle counting and wear condition monitoring. The sensor assembly provides ongoing data about actual brake chamber usage and wear levels, enabling dynamic adjustment of maintenance schedules based on actual conditions rather than fixed time intervals, thus improving reliability while optimizing resource allocation.
Solution Approach 2:
The brake chamber system performs self-diagnosis through integrated sensors that continuously monitor its own stroke cycles and wear conditions. This self-monitoring capability enables the system to identify when maintenance is actually needed, replacing manual inspection scheduling with automated condition-based assessment.
3Device complexity
If a single magnetic sensor is used to detect push rod position, then the device complexity is low, but the entire stroke distance cannot be accurately monitored
Solution Approach 1:
The patent extends measurement coverage along the longitudinal dimension of the chamber by positioning multiple magnetic sensors at different distances from the chamber end. This dimensional expansion of the sensing array enables full-stroke monitoring while keeping each individual sensor simple, resolving the contradiction between device complexity and measurement range.
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
Enables accurate monitoring of brake chamber stroke distance and cycle count, improving maintenance scheduling by providing real-time condition assessment and reducing unnecessary inspections or overlooked wear.
Implementation Method 1
The sensor is configured to detect a magnetic field strength of the magnet and output sensor data representative of the detected magnetic field strength
Data Source
AI summary
A brake chamber includes a chamber housing having an end, a push rod configured for reciprocal movement in the chamber housing in a first direction and a second direction over a stroke distance, a return spring disposed in the chamber housing configured to urge the push rod in the second direction and a sensor assembly having a sensor and a magnet movable relative to the sensor with movement of the push rod. The sensor is configured to detect a magnetic field strength of the magnet and output sensor data representative of the detected magnetic field strength. The sensor assembly is configured to determine a position of the push rod based on the sensor data over the entire stroke distance.