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Fuel control method and system for engine with variable cam timing

  • US 5,357,932 A
  • Filed: 04/08/1993
  • Issued: 10/25/1994
  • Est. Priority Date: 04/08/1993
  • Status: Expired due to Fees
First Claim
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1. A method of determining the amount of fuel to be injected into a cylinder of an internal combustion engine having means for varying the phase angle of at least one camshaft of the engine relative to the crankshaft of the engine, comprising the steps of:

  • (a) calculating an air charge value based on measured air flow into the engine;

    (b) sensing the engine speed and the phase angle of the camshaft relative to said crankshaft at the engine speed sensed;

    (c) calculating a manifold filling coefficient as a function of the engine speed and phase angle sensed in step (b);

    (d) modifying the air charge calculated in step (a) by the manifold filling coefficient calculated in step (c);

    (e) calculating a cylinder air charge utilizing the modified air charge produced by step (d); and

    (f) calculating a cylinder fuel charge to achieve a desired air/fuel ratio.

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