Patent ID: 8459124

Claim:
A general pressure sensor for an automobile comprising a sensor housing, a silicon piezoresistive sensitive core, a sensor core seat, a signal conditioning circuit and an automobile electric device interface, and the silicon piezoresistive sensitive core, the sensor core seat and the signal conditioning circuit are disposed in the inner cavity of the sensor housing, and the sensor housing is installed to the interface of the automobile electric device, wherein, the silicon piezoresistive sensitive core comprises a silicon piezoresistive sensitive element and a glass ring sheet, the silicon piezoresistive sensitive element comprises a silicon film sheet which is, in turn, covered with a silicon oxide layer and a silicon nitride layer on its front surface, the middle part of the front surface of the silicon piezoresistive sensitive element is provided with a Wheatstone bridge, while after the silicon film sheet is exposed in the surrounding part, the silicon piezoresistive sensitive element is welded and fixed to one surface of the glass ring sheet with a thermal expansion coefficient similar to silicon, a strain resistance on the Wheatstone bridge is led out via an inner lead wire, and an insulation oxidation layer is formed on one surface of the glass ring sheet and the silicon piezoresistive sensitive element; the other surface of the silicon ring sheet is hermetically fixed to a ring-shape recession surface provided on the sensor core seat, the sensor core seat is hermetically and rotationally fixed to a pressure inlet on the sensor housing, the inner lead wire on the silicon piezoresistive sensitive core is led to an interposing board provided on one end of the central hole via the other end of the central hole on the ring-shape recession surface of the sensor core seat, and then the inner lead wire is in turn led out via the signal conditioning circuit by automobile electric device interface; the sensor housing comprises a sensor base and a sensor shield which is rotationally fixed to the sensor base and then forms the inner cavity, the sensor shield is installed to the automobile electric device interface, the middle part of the sensor base has a stepped hole as the pressure inlet, and the sensor core seat is rotationally fixed to the stepped hole on the sensor base by means of thread sealant.