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CONTROL APPARATUS OF INTERNAL COMBUSTION ENGINE

  • US 20120016571A1
  • Filed: 04/22/2009
  • Published: 01/19/2012
  • Est. Priority Date: 04/22/2009
  • Status: Active Grant
First Claim
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1. A control apparatus of a compression self-igniting internal combustion engine that is provided with an exhaust gas recirculation apparatus that recirculates part of exhaust gas discharged by an exhaust system in an intake system, and that performs, during a combustion process of the internal combustion engine, a main injection that is a fuel injection for torque generation from a fuel injection valve, the control apparatus comprising:

  • a fuel injection control means that sets, as injection periods of the main injection;

    a “

    fuel injection period for initial combustion”

    for initial low-temperature combustion in which fuel is sequentially burnt in a cylinder while performing an encounter rate lowering operation that lowers an encounter rate between oxygen and a fuel spray in the cylinder,a “

    fuel injection period for diffusive combustion”

    for performing diffusive combustion by performing, when a temperature in the cylinder is at or greater than a predetermined diffusive combustion starting temperature that leads to diffusive combustion, a fuel injection toward a region where a combustion temperature suppressing effect that is attained by exhaust gas recirculated by the exhaust gas recirculation apparatus can be used, anda “

    fuel injection period for transitional combustion”

    that is set between the “

    fuel injection period for initial combustion” and

    the “

    fuel injection period for diffusive combustion”

    , and that is for performing transitional combustion composed of premixed combustion that continuously connects the initial low-temperature combustion and the diffusive combustion, as fuel, which was injected when the temperature in the cylinder was lower than the diffusive combustion starting temperature after the initial low-temperature combustion had started, undergoes spray-cooling by an endothermic reaction of fuel injected in the subsequent “

    fuel injection period for diffusive combustion”

    .

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