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Exhaust pressure transducer

  • US 5,844,769 A
  • Filed: 08/19/1992
  • Issued: 12/01/1998
  • Est. Priority Date: 08/19/1992
  • Status: Expired due to Fees
First Claim
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1. In combination with a diesel engine having an exhaust manifold, an exhaust gas pressure transducer including a housing mounted in said manifold defining an internal cavity having an exhaust gas inlet opening permitting the entry of exhaust gas having carbon particulates into said cavity, a pressure sensor disposed in said cavity, said pressure sensor comprising a planar flexible diaphragm having a peripheral portion disposed in fixed position in said housing and a large central deflecting portion adjoining said peripheral portion and disposed to deflect relative to said fixed peripheral portion upon the presence of pressure within said cavity, said cavity being characterized by the absence of housing structure disposed sufficiently adjacent to substantially the entire area of said deflecting portion of said diaphragm that, upon diesel engine exhaust gas being introduced in said cavity over a long time period, soot buildup on said housing structure would inhibit movement of said diaphragm wherein said cavity is defined by a cylindrical housing wall having a diameter equal to the diameter of the deflecting portion of said diaphragm.

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