Gearbox Fluid Sensing with Stationary-State Measurement Gating
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Solution Overview
Problem
Existing vehicle monitoring systems face challenges in accurately measuring fluid levels and axle temperatures due to movement-induced inaccuracies, and fail to differentiate between healthy and damaged components based on temperature comparisons alone.
Innovation Solution
A system that includes fluid sensors and positioning systems to determine when a vehicle is stationary, allowing for accurate fluid level measurements, and temperature sensors to compare axle temperatures at different speeds, identifying damaged components by relative temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid level measurements are taken during vehicle movement, then continuous monitoring is achieved, but measurement accuracy deteriorates due to movement-induced inaccuracies
Solution Approach 1:
The system performs preliminary assessment by checking vehicle movement status before acquiring fluid level measurements. The processor determines whether the vehicle is stationary or moving based on positioning data, and only acquires measurements when stationary conditions are met, preventing inaccurate measurements from being recorded
Solution Approach 2:
The system dynamically adjusts the measurement acquisition strategy based on real-time vehicle movement conditions. Instead of continuous or periodic measurements regardless of state, the system adaptively triggers measurements only when stationary conditions are detected, optimizing both accuracy and resource usage
2Productivity
If temperature measurements are taken at all speeds, then continuous monitoring is achieved, but the ability to identify damaged components deteriorates due to inability to differentiate temperature patterns
Solution Approach 1:
The system applies different analysis criteria to temperature measurements based on vehicle operating conditions. When the vehicle is stationary, absolute temperature values are used for assessment. When moving, the system analyzes temperature changes and patterns specific to that speed range, applying context-appropriate evaluation to identify damaged components
Solution Approach 2:
The system performs preliminary classification of temperature measurements based on vehicle speed and movement status before conducting damage assessment. This preliminary step separates measurements into stationary and moving categories, allowing subsequent analysis to use appropriate criteria for each condition
3Adaptability or versatility
If fluid sensors are installed onboard, then fluid level monitoring capability is improved, but measurement reliability worsens when vehicle movement is not accounted for
Solution Approach 1:
The positioning system acts as an intermediary between the fluid sensor and the measurement acquisition process. It provides movement status information that mediates when measurements should be taken, ensuring that fluid level readings are only recorded when the vehicle is stationary, thus maintaining reliability
Data Source
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AI summary
A vehicle sensor system includes a fluid sensor (118) configured to be disposed onboard a vehicle system (104) and at least partially extend into a gearbox (300) of a traction motor (110) of the vehicle system (104). The fluid sensor (118) is configured to output data representative of an amount of a lubricating fluid in the gearbox (300). The system also includes a positioning system (120) configured to output data representative of movement or an absence of movement of the vehicle system (104), and one or more processors (106) configured to determine the amount of the lubricating fluid in the gearbox (300) based on the data that is output by the fluid sensor (118) responsive to the data output by the positioning system (120) indicating that the vehicle system (104) has not moved or has moved by less than a designated distance for at least a designated, non-instantaneous period of time.