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Exhaust gas recirculation control system

  • US 7,963,277 B2
  • Filed: 06/26/2008
  • Issued: 06/21/2011
  • Est. Priority Date: 06/26/2008
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas recirculation (EGR) system for an internal combustion engine, comprising:

  • an EGR valve for controlling exhaust gas flow between an exhaust manifold of the engine and an intake manifold of the engine;

    an electronic valve regulator (EVR) coupled between said intake manifold and said EGR valve, an open and closed state of said EVR being electrically controlled;

    an electronic control unit coupled to said EVR and the engine, said electronic control unit providing a control signal to said EVR based on an indication of whether the engine is about to encounter a condition with insufficient vacuum to operate said EGR valve.

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