Adaption device for transmitter wheel of combustion engine
First Claim
1. A device for adaption of tolerances in the measurement of angular segment lengths of a segmented transmitter wheel, comprising a transducer aligned with regard to the transmitter wheel so that at each segment limit it outputs a measurement signal;
- one respective segment length calculation device provided at least for each segment but one and determining a segment length of the associated segment from two successive measurement signals to output a corresponding segment length value;
one respective averaging device provided for each segment and averaging the segment length values for the associated segment out to an adaptation value;
a speed determining device, each of the averaging devices having at least two averaging sub-devices each associated with a speed range; and
a speed selector provided for each segment and operating so that each averaging sub-device only receives a kind of segment length values which apply to the speed range associated with it.
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Accused Products
Abstract
A transmitter wheel is used for example to detect speed changes of an internal combustion engine with high precision in order to calculate a running imbalance value from them. A transmitter wheel of this kind has for example three segments, which are ideally the same length, but in reality usually have lengths which differ slightly from one another. In order to prevent measurement errors which are caused by this, it is known to determine the actual lengths by means of an adaption process. The device according to the invention is embodied such that for each segment, it has a plurality of adaption filters to detect different adaption values for different speed ranges. It has namely turned out that in different speed ranges, different lengths are measured, which is an error that must be compensated for since the length of a segment is in fact actually constant.
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Citations
18 Claims
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1. A device for adaption of tolerances in the measurement of angular segment lengths of a segmented transmitter wheel, comprising a transducer aligned with regard to the transmitter wheel so that at each segment limit it outputs a measurement signal;
- one respective segment length calculation device provided at least for each segment but one and determining a segment length of the associated segment from two successive measurement signals to output a corresponding segment length value;
one respective averaging device provided for each segment and averaging the segment length values for the associated segment out to an adaptation value;
a speed determining device, each of the averaging devices having at least two averaging sub-devices each associated with a speed range; and
a speed selector provided for each segment and operating so that each averaging sub-device only receives a kind of segment length values which apply to the speed range associated with it. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- one respective segment length calculation device provided at least for each segment but one and determining a segment length of the associated segment from two successive measurement signals to output a corresponding segment length value;
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10. A device for adaption of tolerances in the measurement of angular segment lengths of a segment transmitter wheel, comprising a transducer aligned with regard to the transmitter wheel so that at each segment limit it outputs a measurement signal;
- one respective segment length calculation device provided at least for each segment but one and determining a segment length of the associated segment from two successive measurement signals to output a corresponding segment length value;
one respective averaging device provided for each segment, and averaging the segment length values for the associated segment out to an adaption value;
a speed determining device, each of the averaging devices having at least two averaging sub-devices each associated with a speed; and
a weighting device provided for each segment and operating so that with each segment length value, each averaging sub-device receives a weighting factor, with which the averaging is to be carried out and which is smaller the more the actual speed is removed from the speed associated with the averaging sub-device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- one respective segment length calculation device provided at least for each segment but one and determining a segment length of the associated segment from two successive measurement signals to output a corresponding segment length value;
Specification