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Control system for compression-ignition engine

  • US 10,641,197 B2
  • Filed: 11/14/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 12/15/2017
  • Status: Active Grant
First Claim
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1. A control system for a compression-ignition engine, comprising:

  • an engine having a combustion chamber formed by a cylinder, a piston, and a cylinder head;

    an injector attached to the engine and configured to supply fuel into the combustion chamber;

    a spark plug disposed to be oriented into the combustion chamber;

    a swirl valve provided to an intake passage of the engine; and

    a controller connected to the injector, the spark plug, and the swirl valve, and configured to output a control signal to the injector, the spark plug, and the swirl valve, respectively, the controller including a processor configured to execute;

    a swirl adjusting module to adjust an opening of the swirl valve to generate a swirl flow inside the combustion chamber;

    a fuel injection amount controlling module to control fuel injection amounts by the injector, of a pre-injection in which fuel is injected into the combustion chamber and a post-injection in which fuel is injected again after the pre-injection, the fuel injection amount controlling module outputting a first control instruction to the injector to increase a ratio of an injection amount of the post-injection to a total amount of fuel to be injected into the combustion chamber in one cycle as an engine speed increases within a low load side of an operating range where a partial compression-ignition combustion is performed in which the swirl flow is generated, and the fuel injection amount controlling module outputting a second control instruction to the injector to reduce the ratio of the injection amount of the post-injection to the total amount of fuel to be injected into the combustion chamber in one cycle as the engine speed increases within a high load side of the operating range where the partial compression-ignition combustion is performed in which the swirl flow is generated; and

    a combustion controlling module to output an ignition instruction to the spark plug so as to ignite at a given ignition timing after the swirl generation by the swirl adjusting module and the fuel injection by the fuel injection amount controlling module, so that partial compression-ignition combustion in which the mixture gas combusts by flame propagation and then combusts by compression ignition is performed.

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