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Exhaust gas purification device and method for diesel engine

  • US 20030070425A1
  • Filed: 10/11/2002
  • Published: 04/17/2003
  • Est. Priority Date: 10/12/2001
  • Status: Active Grant
First Claim
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1. An exhaust gas purification device for a diesel engine having an injector injecting fuel directly into a combustion chamber of the engine, comprising:

  • a NOx trap catalyst trapping nitrogen oxides (NOx) contained in exhaust gas when an air-fuel ratio of the exhaust gas is leaner than stoichiometric air-fuel ratio, and reducing NOx stored in the catalyst when the air-fuel ratio of the exhaust gas is richer than stoichiometric air-fuel ratio; and

    a controller programmed to;

    make a judgment as to whether the catalyst should be regenerated;

    calculate instruction values regarding the main fuel injection, in accordance with engine operating conditions and the judgment;

    calculate instruction values regarding additional fuel injection, when the judgment shows that the catalyst should be regenerated; and

    control the injector according to the instruction values regarding the main and the additional fuel injection, in order to regenerate the catalyst.

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