The pressure sensor designed by First Sensor Technology GmbH (FST) uses a special patented piezo-resistive monolithic sensor element for measuring the point stress on a steel diaphragm. The sensor works in a temperature range between -40 deg C and 140 deg C and has an accuracy of 1.3 % depending on the temperature range. With this concept a pressure sensor with minimized outside dimensions has been developed, applicable for engine oil, diesel, transmission oil, gasoline and blend, carbon dioxide and other media in a pressure range between 35 bar and 3000 bar. The pressure sensor concept has a one part pressure connector, which is made of stainless steel and includes thread and diaphragm. Therefore, no further welding processes are needed and we also have a clear separation from pressurized media On top of the diaphragm an ASIC including a piezo-resistive sensor element (Weathstone bridge) is soldered on a metal membrane. This ASIC includes all fail safe functionalities like an integrated sensor check of signal conditioning path and others. The sensor element has to be electrically connected by wire bonding to the PCB. The housing with integrated pins is assembled afterwards. The complete pressure sensor is calibrated in an end of line calibration. In this article the next generation of high pressure sensors for automotive and industrial applications is discussed for high volume markets. One of the most important topics is the fail safe concept and the possibilities and benefits for customers use. Furthermore, the flexibility to accomplish customer needs in combination with short development terms is also discussed. The paper offers to meet the customers applications like qualifying new materials, modifying outside dimensions, etc. Another topic is the robust design and a description how to withstand harsh environments. Additionally, results of the finite element analysis (FEA) are also shown.
"Intelligent" high pressure sensor for automotive application
Intelligenter Hochdrucksensor für fahrzeugtechnische Anwendungen
2007
12 Seiten, 12 Bilder
Conference paper
English
"Intelligent" High Pressure Sensor for Automotive Application
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