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Exhaust Gas Purification System for Internal Combustion Engine

  • US 20090158713A1
  • Filed: 06/11/2007
  • Published: 06/25/2009
  • Est. Priority Date: 06/09/2006
  • Status: Abandoned Application
First Claim
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1. An exhaust gas purification system for an internal combustion engine, characterized by comprising:

  • an EGR apparatus for introducing at least part of the exhaust gas of said internal combustion engine as EGR gas into an air intake system of said internal combustion engine;

    a supercharger for supercharging intake air using energy from the exhaust gas of said internal combustion engine;

    EGR gas amount control unit for controlling the EGR gas amount introduced into said air intake system of said internal combustion engine by said EGR apparatus;

    target EGR gas amount calculation unit for calculating a target EGR gas amount that is a target value of the EGR gas amount, based on the operating state of said internal combustion engine;

    target charging pressure calculation unit for calculating a target charging pressure that is a target value of the charging pressure, based on the operating state of said internal combustion engine; and

    charging pressure detection unit for detecting the actual charging pressure, whereinif the actual charging pressure detected by said charging pressure detection unit is lower than the target charging pressure when said internal combustion engine is in a transient operating state, said EGR gas amount control unit controls the EGR gas amount to an amount smaller than the target EGR gas amount.

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