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Air dynamics state characterization

  • US 5,423,208 A
  • Filed: 11/22/1993
  • Issued: 06/13/1995
  • Est. Priority Date: 11/22/1993
  • Status: Expired due to Term
First Claim
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1. A method for detecting transitions between a steady state condition and a transient condition in an internal combustion engine having a plurality of cylinders and an inlet air valve for metering inlet air to an intake manifold, in which inlet air rate to the intake manifold substantially corresponds to inlet air rate to the cylinders in the steady state condition, comprising the steps of:

  • sensing a first set of engine operating parameters;

    sensing a second set of engine operating parameters;

    detecting a transition from the steady state condition to the transient condition by (a) determining variations in the magnitude of the sensed first set of engine operating parameters over a first time period, (b) comparing each of the determined variations to a corresponding one of a set of transient noise threshold values, and (c) detecting the transition from the steady state condition to the transient condition when each of the determined variations exceeds the corresponding one of the set of transient noise threshold values; and

    detecting a transition from the transient condition to the steady state condition by (a) determining variations in the magnitude of the sensed second set of engine operating parameters over a second time period, (b) comparing each of the determined variations to a corresponding one of a set of steady state noise threshold values, and (c) detecting the transition from the transient condition to the steady state condition when each of the determined variations is less than or equal to the corresponding one of the set of steady state noise threshold values.

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