A pressure sensor for detecting pressure in a combustion chamber of internal combustion engines has a housing, a sensor element composed of a piezoresistive material and arranged in the housing, a diaphragm, a punch introducing a pressure to be determined onto the sensor element and located between the...http://www.google.de/patents/US5315875?utm_source=gb-gplus-sharePatent US5315875 - Pressure sensor for detecting the pressure in the combustion chamber of internal-combustion engines
