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METHODOLOGY FOR EXTENDING THE HIGH LOAD LIMIT OF HCCI OPERATION BY ADJUSTING INJECTION TIMING AND SPARK TIMING

  • US 20100222985A1
  • Filed: 03/02/2009
  • Published: 09/02/2010
  • Est. Priority Date: 03/02/2009
  • Status: Active Grant
First Claim
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1. Method for controlling an internal combustion engine capable of operating in a homogeneous charge compression ignition mode, including extended operation in the homogeneous charge compression ignition mode at high loads by reducing occurrence of ringing within the engine, said method comprising:

  • operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition;

    monitoring an engine load;

    monitoring an engine speed;

    determining when the engine is in a high ringing range based upon the engine load and the engine speed; and

    when the engine load is in the high ringing range, operating the engine in a reduced ringing mode, comprisingmodulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing,determining a preferred combustion phasing value, andmodulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value.

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