Wireless Sensor Capacitance Isolation for Lubricant Monitoring
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Solution Overview
Problem
Existing methods for monitoring the lubricant level and quality in industrial machines, such as gear trains, are inadequate due to limitations in visual inspection and hardwired sensors, which are not practical for harsh environments and space-constrained applications, leading to potential damage from lubricant leakage and contamination.
Innovation Solution
A wireless sensor system coupled with a processor that generates data signals representative of the lubricant level and quality, using a capacitance control structure to isolate sensor capacitance, allowing for remote communication and autonomous operation planning to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection or hardwired sensors are used to monitor lubricant, then the monitoring method is simple, but it is not practical for harsh environments and space-constrained applications
Solution Approach 1:
The patent replaces hardwired mechanical sensor connections with a wireless sensor system that uses electromagnetic signals for data transmission. This eliminates the need for physical wiring through harsh environments, making the system practical for space-constrained and difficult-to-access applications while maintaining monitoring simplicity.
2Reliability
If wireless sensors are used for monitoring, then the system is suitable for harsh environments, but battery life is limited and space constraints prevent using larger batteries
Solution Approach 1:
The wireless sensor system operates in periodic cycles, alternating between sleep mode and active measurement/transmission modes. The sensor takes measurements at intervals and remains in low-power state between measurements, significantly extending battery life while maintaining the ability to monitor lubricant conditions in harsh environments.
Solution Approach 2:
The patent employs energy harvesting techniques that accelerate energy accumulation through environmental energy sources. The system captures and stores energy from vibrations, temperature differentials, or electromagnetic fields present in the industrial environment, supplementing battery power and extending operational duration without increasing battery size.
3Measurement precision
If sensors with high power consumption are used, then temperature sensing capabilities improve, but current draw prohibits use in wireless systems
Solution Approach 1:
The temperature sensor operates periodically rather than continuously, taking measurements at predetermined intervals and remaining in low-power state between measurements. This reduces average current draw to levels compatible with wireless battery-powered operation while maintaining sufficient temperature monitoring precision for detecting lubricant degradation.
Solution Approach 2:
The system adjusts sensor measurement parameters dynamically based on operational conditions. Temperature measurement resolution and frequency are modified according to the severity of detected anomalies - using lower precision during normal operation to conserve power, and higher precision when degradation is detected, optimizing the balance between measurement capability and power consumption.
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 effective monitoring of lubricant levels and quality in harsh environments, preventing damage by allowing for remote operation planning and reducing the risk of lubricant leakage and contamination, thus extending machine lifespan.
Implementation Method 1
The sensor is configured to contact a fluid and measure a characteristic of the fluid
Data Source
AI summary
A system includes a sensor, one or more processors, a transmitter, and a capacitance control structure. The sensor is configured to contact a fluid and measure a characteristic of the fluid. The one or more processors are operably coupled to the sensor. The one or more processors are configured to generate one or more data signals representative of the characteristic of the fluid that is measured by the sensor. The transmitter is operably coupled to the one or more processors. The transmitter is configured to wirelessly communicate the one or more data signals to a remote reader. The capacitance control structure is configured to one or more of reduce or isolate sensor capacitance of the sensor from the one or more processors.