Wheel-Mounted Odometry for Train Slip Detection
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Solution Overview
Problem
Existing technologies face challenges in accurately determining the location and movement of vehicles, such as trains, due to issues like wheel slip and wheel slide, especially when positioning equipment is disabled, and there is a need for precise tracking and monitoring of vehicle position, speed, and acceleration.
Innovation Solution
A system comprising wheel-mounted accelerometers and gyroscopes, along with a marker detection sensor and inclinometer, which measure centripetal and tangential accelerations, angular speed, and grade, allowing for accurate determination of vehicle speed, direction, distance traveled, and stationary status, even in conditions of wheel spin or slide, without relying on external measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning equipment is used to track vehicle location, then basic position information can be obtained, but the system fails to accurately detect wheel slip and wheel slide conditions
Solution Approach 1:
The positioning system is segmented into multiple independent measurement components: accelerometers mounted on each wheel to measure wheel-specific acceleration, gyroscopes to measure angular velocity, and encoders to measure rotation angle. This segmentation allows individual wheel conditions to be monitored separately, enabling detection of wheel slip and slide that would be missed by a single centralized positioning sensor.
Solution Approach 2:
The patent introduces accelerometers and gyroscopes as intermediary sensors between the wheel and the positioning system. These intermediaries directly measure the physical state of the wheel (acceleration, angular velocity) and provide data that reveals wheel slip conditions, acting as mediators that translate mechanical wheel behavior into detectable signals for the control system.
2Reliability
If wheel-mounted sensors are installed to measure acceleration and angular velocity, then wheel slip can be detected, but the device complexity increases
Solution Approach 1:
Multiple sensor types (accelerometers, gyroscopes, encoders) are merged into an integrated wheel-mounted measurement system. The accelerometers measure linear acceleration, gyroscopes measure angular velocity, and encoders measure rotation angle, combining these measurements into a unified data stream that comprehensively characterizes wheel behavior and enables reliable slip detection through a single coordinated system.
Solution Approach 2:
The wheel-mounted sensor system performs multiple functions simultaneously: it measures wheel acceleration, angular velocity, and rotation angle, while also detecting wheel slip, calculating wheel radius, and providing data for both positioning and control purposes. This multi-functionality reduces the need for separate specialized sensors for each measurement type.
3Loss of information
If multiple sensors are mounted on each wheel to measure various parameters, then comprehensive wheel data is obtained, but the manufacturing cost and installation complexity increase
Solution Approach 1:
The system measures multiple physical parameters (acceleration, angular velocity, rotation angle) and uses changes in these parameters over time to detect wheel slip conditions. By monitoring parameter changes rather than requiring direct measurement of slip itself, the system achieves comprehensive wheel state information using standard sensor types that are relatively easy to manufacture and install.
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 provides precise and reliable tracking of vehicle movement, enabling accurate monitoring of wheel diameter, track conditions, and rail adhesion, and detects cold motion, even when the primary positioning system is off, ensuring continuous and accurate data collection.
Implementation Method 1
The accelerometer measures the centripetal acceleration of the wheel
Implementation Method 2
The gyroscope measures the angular speed of the wheel
Implementation Method 3
A marker detection sensor with a field of view that overlaps with the marker is provided
Data Source
AI summary
A standalone odometry device includes an accelerometer and/or gyroscope configured to be mounted on a wheel or axle of a vehicle. A controller in communication with the accelerometer and/or gyroscope is configured to receive data from the accelerometer and/or gyroscope. The controller processes the data to determine one or more of the speed, wheel rotation direction, accumulated distance travelled, stationary status, acceleration, deceleration, wheel diameter, and grade of surface on which the wheel is in contact.