Apparently the site is offline now but I want to post what was on it.
Pressure Measurement in Combustion Engines
Contact Person : Dr.-Ing.Ha-Duong Ngo
Introduction:
There is a great demand in the automotive industry for high temperature (up to 500°C) pressure sensors that can be operated in combustion engines. By accurately monitoring and controlling the pressure and temperature in the combustion chamber (Fig. 1), the
Engine efficiency can be raised and the fuel consumption and pollutant emission reduced. Therefore a micromechanical high temperature pressure sensor using a membrane based piezoresistive ß-SiC-on-SOI (SiCOI) sensor chip and a specially designed housing has been developed and fabricated.
Fig. 6: Dynamic cylinder pressure measured with the SiCOI sensor in the combustion chamber of a gasoline Engine at 1500 rpm. For comparison the output signal of a quartz pressure transducer from Kistler AG is shown.
Conclusions:
With a micromechanical piezoresistive SiCOI pressure sensor static and dynamic measurements have been performed. The SiCOI sensor was tested under static pressures of up to 200 bar in the temperature range between room temperature and 300°C. The dynamic pressure measurements in the combustion chamber of a gasoline Engine were performed at 1500 rpm under different loads. The work demonstrates, that the fabricated and characterized SiCOI sensor is best suited for accurately monitoring the cylinder pressure of combustion engines, i.e. the recognition of misfire, above dead center and maximum pressure.