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Method for improving spark ignited internal combustion engine acceleration and idling in the presence of poor driveability fuels

  • US 5,957,994 A
  • Filed: 08/12/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 08/12/1996
  • Status: Expired due to Term
First Claim
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1. A method for accelerating rotational speed of a crankshaft of an internal combustion engine having a plurality of cylinders each having a spark plug wherein a predetermined amount of fuel is delivered to be combusted at a firing time within each of the plurality of cylinders with each rotation of the crankshaft based on an acceleration demand made by an operator, the method comprising the steps of:

  • receiving the acceleration demand;

    measuring the rotational speed of the crankshaft;

    defining an expected engine speed based on the acceleration demand;

    calculating a speed error as the rotational speed of the crankshaft less the expected engine speed;

    calculating engine acceleration from the rotational speed; and

    adjusting the predetermined amount of delivered fuel to be combusted in each of the plurality of cylinders to reduce the speed error as the speed error changes as a function of the engine acceleration.

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