Centric Temperature Sensor in Combined Pressure Device
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Solution Overview
Problem
Existing combined pressure and temperature sensors for CO2 air conditioning systems in vehicles are complex, costly, and have inaccurate temperature measurements due to eccentric temperature sensor placement, which affects installation position and service life.
Innovation Solution
A combined pressure and temperature sensor design featuring a centrically positioned temperature sensor within a concentric channel, sealed by a dome-shaped extension piece with heat-conductive material, and a ring diaphragm with pressure channels on both sides, allowing for accurate temperature measurement and easy mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate threaded part with O-ring sealing is used for the temperature sensor, then the temperature sensor can be sealed, but the device becomes complex and costly, and the O-ring deteriorates over time causing leakages
Solution Approach 1:
The patent merges the sealing function directly into the sensor element body by integrating a sealing groove and sealing bead structure into the single-part sensor element. This eliminates the separate threaded part and O-ring, reducing device complexity while maintaining sealing reliability through the integrated elastomer sealing bead that prevents medium leakage without deteriorating over time like separate O-rings.
2Ease of manufacture
If the temperature sensor is positioned eccentrically, then the sensor structure is simpler, but the temperature measurement accuracy decreases and depends on installation position
Solution Approach 1:
The patent uses asymmetric positioning of the temperature sensor within the sensor element, placing it eccentrically relative to the pressure measurement diaphragm. This asymmetric design allows the temperature sensor to be optimally positioned for accurate temperature measurement of the medium while maintaining a simple single-part sensor structure that is easy to manufacture.
3Object-affected harmful factors
If a protective screen is inserted in the diaphragm area, then the sensor is protected, but the service life becomes extremely short making it suitable only for sport racing applications
Solution Approach 1:
The patent implements beforehand cushioning by designing the diaphragm with an integrated protective structure that includes a recess and protective elements built into the sensor element itself. This prior protection is incorporated into the basic design, allowing the diaphragm to withstand harsh conditions without requiring separate protective screens that would limit service life, thereby enabling long-term use in regular automotive applications.
4Measurement precision
If two separate sensors are used for pressure and temperature recording, then accurate measurements are obtained, but the expenditure becomes very great
Solution Approach 1:
The patent merges pressure and temperature sensing functions into a single integrated sensor element that contains both a pressure measurement diaphragm and a temperature sensor in one component. This combined sensor maintains accurate measurement capabilities for both pressure and temperature signals while significantly reducing system complexity and cost compared to using two separate sensors.
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
The solution provides accurate temperature measurement independent of installation position, enhances service life, and is suitable for mass production by simplifying the design and improving heat conduction, while maintaining reliable pressure measurement.
Implementation Method 1
a heat-conductive sealing material may be accommodated to improve heat conduction, in which the head of the temperature sensor is embedded
Data Source
AI summary
A combined pressure and temperature sensor for recording the pressure and the temperature of a medium. The combined pressure and temperature sensor includes a sensor element in which at least one channel is developed for accommodating a temperature sensor and at least one channel is developed for recording a pressure. The at least one channel, for recording a pressure, opens out under a pressure sensor. The at least one channel for the temperature sensor runs centrically in the sensor element.