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EXHAUST GAS RECIRCULATION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

  • US 20110054762A1
  • Filed: 05/20/2008
  • Published: 03/03/2011
  • Est. Priority Date: 05/20/2008
  • Status: Active Grant
First Claim
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1. An exhaust gas recirculation apparatus for an internal combustion engine characterized by comprising:

  • a turbocharger that has a turbine arranged on an exhaust passage of said internal combustion engine and a compressor arranged on an intake passage of said internal combustion engine;

    a low pressure EGR passage that serves to take in, as a low pressure EGR gas, a part of an exhaust gas from said exhaust passage at a location downstream of said turbine and recirculate the low pressure EGR gas to said intake passage at a location upstream of said compressor;

    a high pressure EGR passage that serves to take in, as a high pressure EGR gas, a part of the exhaust gas from said exhaust passage at a location upstream of said turbine and recirculate the high pressure EGR gas to said intake passage at a location downstream of said compressor;

    a calculation unit that calculates a low pressure EGR rate representative of the proportion of an amount of low pressure EGR gas to an amount of intake air sucked into said internal combustion engine and a high pressure EGR rate representative of the proportion of an amount of high pressure EGR gas to said amount of intake air by using a CO2 concentration in said intake passage at a location downstream of a connection portion of said low pressure EGR passage and upstream of a connection portion of said high pressure EGR passage, a CO2 concentration in said intake passage at a location downstream of the connection portion of said high pressure EGR passage, and a CO2 concentration of the exhaust gas discharged from said internal combustion engine; and

    an EGR rate control unit that controls said low pressure EGR rate and said high pressure EGR rate calculated by said calculation unit to individual target values, respectively.

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