Pressure Sensor Module for High Temperature, High Pressure, and Quick Response

Paper #:
  • 2018-01-0759

Published:
  • 2018-04-03
Author(s):
Affiliated:
Abstract:
According to the advance of engine control development, demands for direct sensing of physical quantity has been growing. Regarding pressure sensing, key properties for direct sensing are robustness against high temperature and pressure, and response time. In this work, a pressure sensor module with these key properties was developed. First of all, various pressure sensing principles were compared, and piezoelectric device was selected as a suitable sensing principle for required properties because of its thermally stable piezoelectric effect, stiff structure, and potential for simple installation structure. Then, the piezoelectric sensor module was modeled as an equivalent spring model. Based on this model, degradation mechanism of the sensor accuracy was established by converting the sensor components degradation to spring constant changes, and then the contact state between each component was proven to be the important factor for sensor accuracy. Regarding robustness against high temperature, the sensor module was designed to compose multiple thermal isolation layer with outer housing which is optimized according to its application. Regarding robustness against pressure and response time, breakage of piezoelectric element is the main technical issue. Based on FEM analysis, bounce of piezoelectric element in the sensor structure, which is caused by response delay of sensor components, was proven to be the main cause of the element breakage. To prevent piezoelectric element bounce, pre-load welding structure was developed as a countermeasure. Finally, a cylinder pressure sensor was designed as an application example of this pressure sensor module. As a result of engine bench test, target accuracy, robustness against temperature and pressure, and response time were confirmed.
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