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System for diagnosing delta pressure sensor operation

  • US 6,850,833 B1
  • Filed: 11/03/2003
  • Issued: 02/01/2005
  • Est. Priority Date: 11/03/2003
  • Status: Active Grant
First Claim
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1. A system for diagnosing operation of a delta pressure sensor used with an internal combustion engine, comprising:

  • an intake manifold and an exhaust manifold each operatively coupled to the engine;

    an EGR conduit fluidly coupled between the intake and exhaust manifolds;

    a flow restriction mechanism disposed in-line with the EGR conduit, the delta pressure sensor producing a delta pressure signal indicative of a pressure differential across the flow restriction mechanism; and

    a control computer comparing the delta pressure signal to a modeled delta pressure value modeled as a function of at least engine speed and one of engine load and engine output torque percentage, the control computer diagnosing a fault state of the delta pressure sensor based on the comparison.

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