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EGR controller for cylinder cut-off engine

  • US 6,244,258 B1
  • Filed: 12/01/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 12/02/1998
  • Status: Expired due to Term
First Claim
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1. An EGR controller for a cylinder cut-off engine, which controls an EGR action so that exhaust gas from said cylinder cut-off engine is recirculated to an induction side via an EGR path, said cylinder cut-off engine being changeable over a running state between an all-cylinder run where all cylinders are running and a cut-off-cylinder run where a part of the cylinders are cut off, said EGR controller comprising:

  • an open/close unit opening and closing said EGR path;

    a detecting unit detecting an engine temperature at said cylinder cut-off engine;

    a comparing unit comparing said engine temperature detected by said detecting unit with a first predetermined temperature and a second predetermined temperature that is lower than said first predetermined temperature;

    a determining unit determining whether the running state of said cylinder cut-off engine is said all-cylinder run or said cut-off-cylinder run; and

    a control unit controlling said EGR action so as to be executed when said engine temperature is higher than said first predetermined temperature at said all-cylinder run, and when said engine temperature is higher than said second predetermined temperature at said cut-off-cylinder run, by driving said open/close unit so as to open or close in accordance with a result of comparison by said comparing unit and on a result of determination by said determining unit.

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