Patent ID: 7073375
Filing Date: 2006-07-11
Classification: F01N,G01L,Y02T

Abstract:
1. An exhaust back pressure sensing system, comprising: an absolute pressure sensor exposable to an exhaust gas, wherein said absolute pressure sensor comprises at least one pressure sense die and a hermetically sealed cover located above a diaphragm configured from said at least one pressure sense die, wherein said sealed cover and said diaphragm form a reference pressure cavity therebetween; a housing in which said absolute pressure sensor is located in association with a carrier for maintaining said absolute pressure sensor and a circuit board populated with a plurality of surface mounted components for electrical connection to said absolute pressure sensor; and a pressure inlet formed from said carrier, wherein said pressure inlet is filled with a gel for protecting said diaphragm and at least one adhesive thereof, thereby preventing said exhaust gas, including acids and hazardous chemicals thereof from damaging said at least one pressure sense die and electrically sensitive portions thereof.