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Auto-ignition timing control and calibration method

  • US 7,076,360 B1
  • Filed: 03/15/2005
  • Issued: 07/11/2006
  • Est. Priority Date: 03/15/2005
  • Status: Expired due to Fees
First Claim
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1. A method of controlling an internal combustion engine when operating in a controlled auto-ignition mode, the method comprising the steps of:

  • before the commencement of an engine compression phase determining a target crank angle from a predetermined data table and from current engine operating conditions, the data table providing a plurality of auto-ignition timing crank angle data relating to a plurality of engine operating conditions;

    determining a plurality of engine operating parameters;

    iteratively performing the steps of(i) utilizing the plurality of engine operating parameters, computing a predicted compression temperature which would be reached by the combustible charge at the target crank angle during the compression phase of the engine cycle;

    (ii) comparing the predicted compression temperature with a target temperature;

    (iii) modifying a computational value of at least one settable engine operating parameter;

    (iv) returning to step (i) until a combination of parameters is found which would result in the predicted compression temperature matching the target temperature at the target crank angle; and

    setting at least one of the actual engine operating parameters for the engine cycle in accordance with the final values ascertained by the iterative calculation process.

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