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EXHAUST GAS RECIRCULATION APPARATUS FOR ENGINE

  • US 20140290239A1
  • Filed: 03/31/2014
  • Published: 10/02/2014
  • Est. Priority Date: 04/02/2013
  • Status: Active Grant
First Claim
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1. An exhaust gas recirculation apparatus for an engine, the apparatus including:

  • an exhaust gas recirculation passage to allow part of exhaust gas discharged from a combustion chamber of an engine to an exhaust passage to flow as exhaust recirculation gas into an intake passage and recirculate back to the combustion chamber;

    a motor-driven exhaust gas recirculation valve provided in the exhaust gas recirculation passage to regulate a flow rate of the exhaust recirculation gas in the exhaust gas recirculation passage,the exhaust gas recirculation valve including a valve seat, a valve element provided to be seatable on the valve seat, and a motor to drive the valve element; and

    a control unit configured to control the exhaust gas recirculation valve according to an operating condition of the engine,wherein the control unit is configured to;

    calculate a target correction value corresponding to the operating condition of the engine;

    cut off energization to the motor when the exhaust gas recirculation valve is to be held at a predetermined opening degree during operation of the exhaust gas recirculation valve; and

    thenrestart energization to the motor, calculate an energization cutoff correction value corresponding to an elapsed time since energization to the motor is cut off, and correct the target correction value by the calculated energization cutoff correction value when the exhaust gas recirculation valve is to be controlled to the target opening degree.

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