Pressure-Temperature Sensor Voltage Variation for Failure Detection
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Solution Overview
Problem
Existing sensor devices face challenges in determining failures at high temperatures without compromising pressure measurement accuracy in refrigeration cycle apparatuses.
Innovation Solution
A sensor device with a pressure-temperature sensor and an air-conditioner ECU that uses a voltage variation control mechanism to assess the functionality of the signal processing circuit by changing the supply voltage and monitoring the response of pressure and temperature signals, allowing for failure determination without affecting measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage variation control is implemented to determine sensor failure, then reliability of failure detection is improved, but measurement precision of pressure measurement deteriorates
Solution Approach 1:
The patent segments the detection process into two distinct modes: a first detection mode for normal operation with standard voltage supply that ensures measurement precision, and a second detection mode for failure detection with varied voltage supply that ensures reliability. The controller selectively switches between these modes based on operational requirements, allowing each mode to optimize for its specific purpose without compromising the other.
Solution Approach 2:
The patent implements dynamic voltage control where the voltage supplied to the sensor varies depending on the detection mode. In the first mode, a constant standard voltage is supplied for accurate measurements. In the second mode, the voltage is dynamically varied to test sensor response and determine failure. This dynamic adjustment allows the system to achieve reliable failure detection while maintaining measurement precision during normal operation.
2Adaptability or versatility
If voltage is varied to test sensor functionality, then failure determination capability is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent employs periodic action by implementing regular sensor diagnostics where the controller periodically switches to the second detection mode to vary voltage and test sensor functionality, then returns to the first detection mode for normal accurate measurements. This periodic testing approach enables the system to maintain high measurement accuracy during normal operation while periodically assessing sensor health through voltage variation.
Solution Approach 2:
The patent applies preliminary action by performing failure detection tests before they are critically needed. The controller proactively varies voltage to test sensor response in the second detection mode, identifying potential failures early before they affect measurement accuracy in normal operation. This preliminary testing ensures measurement precision is maintained by detecting issues before they degrade performance.
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 reliable failure detection of the sensor device at high temperatures without deteriorating pressure measurement accuracy, ensuring the normal operation of refrigeration systems.
Implementation Method 1
gauge units for detecting the pressure of the measured object
Implementation Method 2
gauge units for detecting the temperature of the measured object
Data Source
AI summary
A sensor device includes a pressure-temperature detection unit and a signal processing circuit. The sensor device is configured to detect abnormalities by changing a supply voltage supplied to the pressure-temperature detection unit and to the signal processing circuit, and by monitoring changes in a pressure signal and in a temperature signal caused by changing the supply voltage.