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Methods for reducing raw particulate engine emissions

  • US 9,488,093 B2
  • Filed: 01/09/2014
  • Issued: 11/08/2016
  • Est. Priority Date: 01/11/2013
  • Status: Active Grant
First Claim
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1. A method for reducing particulate emissions from a direct injection applied-ignition engine during a starting phase, comprising:

  • adjusting at least one of a fuel release pressure threshold and enrichment factor based on one or more engine conditions;

    activating a starting device to rotate a crankshaft coupled to an engine cylinder without injecting any fuel;

    before fuel pressure exceeds the fuel release pressure threshold, rotating the crankshaft without injecting any fuel;

    supplying fuel to the cylinder based on the enrichment factor only when the fuel pressure exceeds the fuel release pressure threshold; and

    stratifying a cylinder charge while adjusting at least one fuel injection within one of a compression phase and expansion phase of the engine.

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