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Adaptation method for correcting tolerances of a transducer wheel

  • US 5,789,658 A
  • Filed: 10/31/1996
  • Issued: 08/04/1998
  • Est. Priority Date: 10/31/1995
  • Status: Expired due to Term
First Claim
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1. In an adaptation method for correcting tolerances of a transducer wheel connected to a crankshaft of an engine, which includes:

  • scanning spacings between a number of mutually spaced apart teeth of the transducer wheel with a pickup furnishing a pulse train, measuring a chronological spacing of the pulse train for each tooth or for a segment encompassing a plurality of teeth, and correcting the chronological spacing in overrunning operating states of the engine, the improvement which comprises;

    calculating a mean tooth time from currently measured tooth time values or segment time values;

    standardizing the current tooth time values to the mean tooth time defining standardized tooth times;

    determining an rpm range in which the engine is operating;

    ascertaining an adaptation factor for each tooth in dependence on the ascertained rpm range;

    correcting the adaptation factor belonging to every jth tooth in an ith rpm range with the standardized tooth times defining a series of corrected adaptation factors;

    calculating a correction factor for each tooth or each segment from the corrected adaptation factors; and

    correcting a jth tooth time value with the corresponding correction factor.

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