Adaptation method for correcting tolerances of a transducer wheel
First Claim
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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Accused Products
Abstract
An adaptation method for correcting tolerances of a transducer wheel includes determining a correction factor for each individual tooth or each segment of the transducer wheel by measuring angular speed while taking into account both production tolerances and variations from one manufactured part to another of its kind as well as noncentral support of the transducer wheel on the shaft. The correction factor also compensates for a mass moment caused by a piston and a connecting rod. In an adaptation algorithm, a periodic disturbance by a gas moment caused by varying cylinder pressures and a moment fed back from the road are taken into account.
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Citations
9 Claims
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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. - View Dependent Claims (2, 3, 4, 5)
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6. In an adaptation method for correcting tolerances of a transducer wheel 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 an engine, the improvement which comprises; calculating a mean tooth time from currently measured tooth time values or segment time values; calculating a differential variable in accordance with the equation;
##EQU19## Tdiff (n) is the differential variable, T(n) is the currently measured tooth time values or segment time values, and T is the mean tooth time;determining an rpm range in which the engine is operating and defining an ascertained rpm range; ascertaining an adaptation factor for each tooth depending on the ascertained rpm range; correcting a jth tooth difference in an ith rpm range with the differential variable defining corrected adaption 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 correction factor for each tooth. - View Dependent Claims (7, 8, 9)
Specification