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Method for operating a direct-injection spark-assisted compression-ignition engine

  • US 8,434,450 B2
  • Filed: 01/27/2010
  • Issued: 05/07/2013
  • Est. Priority Date: 01/27/2010
  • Status: Active Grant
First Claim
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1. A method for operating a compression-ignition internal combustion engine comprising a plurality of combustion chambers operating in a four-stroke combustion cycle and configured to operate at a geometric compression ratio greater than 10:

  • 1, the method comprising;

    operating the engine in a spark-assisted compression-ignition combustion mode for all speed/load engine operating points, comprising;

    forming a fuel/air charge by injecting a first quantity of fuel into each combustion chamber during a compression stroke, said injecting being completed prior to any combustion within the combustion chamber;

    operating the engine to manage temperature of the fuel/air charge in the combustion chamber below an auto-ignition point of the fuel/air charge; and

    providing a spark discharge in the combustion chamber subsequent to injecting the first quantity of fuel and in advance of the fuel/air charge achieving an auto-ignition temperature.

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