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System and method for enhanced combustion control in an internal combustion engine

  • US 6,609,493 B2
  • Filed: 11/07/2001
  • Issued: 08/26/2003
  • Est. Priority Date: 11/21/2000
  • Status: Active Grant
First Claim
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1. A system for enhanced combustion control in an internal combustion engine having at least one cylinder, a reciprocating piston within the cylinder to define a combustion chamber therein, comprising:

  • a fuel supply system having a fuel injector positioned to directly inject fuel into the combustion chamber, the fuel supply system being capable of performing a split injection wherein a first fuel injection in each engine cycle precedes a second fuel injection that occurs during compression stroke in the same engine cycle;

    a spark plug positioned to produce a spark to ignite a first air/fuel mixture portion created due to the second fuel injection to initiate a first stage combustion, the first stage combustion elevating temperature and pressure high enough to cause auto-ignition of a second air/fuel mixture portion surrounding the first air-fuel mixture portion to initiate an auto-ignited second stage combustion; and

    an engine controller programmed to perform control over beginning time of the auto-ignited second stage combustion in response to at least one of the engine speed and engine load.

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