Adaption device for transmitter wheel of combustion engine

Details Adaption device for transmitter wheel of combustion engine Adaption device for transmitter wheel of combustion engine

1995-11-20

1997-12-09

Dombroske, George M.

Measuring and testing

Test stand

For engine

36443103, 36443107, G01P 0348, G01D 0102, F02D 4100

Patent

active

056963165

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a device for adaption of tolerances in measurement of angular segment lengths of a segmented transmitter wheel which is affixed for example to the crankshaft of an internal combustion engine.
A device of this type is known from document DE-A-41 33 679. The device described there also has a learning progress determining device, as well a comparison device.
A transmitter wheel of an internal combustion engine can be calibrated such that it supplies a measurement signal via a transducer whenever a respective piston is situated in its upper dead center. To this end, a transmitter wheel in a six cylinder engine has three teeth which each extend over 60.degree. as well as three sections which are disposed between the teeth, have a low wheel diameter, and likewise each extend over 60.degree.. At each ascending and descending tooth edge, the transducer supplies a measurement signal. In the above described function, the above described transmitter wheel has six segments. If only the rising tooth edges are taken into account in the same transmitter wheel, it has three segments, each with a length of 120.degree.. For the sake of simplicity, only a transmitter wheel with three segments is referred to below. The number of segments and their positions are not important to the invention.
If the transmitter wheel turns at a certain speed and the duration between two segments beginnings is determined by counting time pulses, the count value of 100 might be produced, for example, for each segment of an ideal transmitter wheel, thus the total count value would be 300 for one complete revolution of the transmitter wheel. In actual use, though, due to varying tolerances, irregular count values are obtained, for example the count value 101 for the first segment, the count value 97 for the second segment, and the count value 102 for the third segment. If the measurement signals which are generated with the help of the transmitter wheel are required for precise processing algorithms, these actual segment lengths must be taken into account instead of the ideal ones. In addition, an adaption is required, which in the exemplary case, starts from the count value of 100 for each segment, but then adapts to the above-mentioned precise values. If the segment lengths at a fixed speed are precisely measured in this manner, then these precisely determined segment lengths can then be used to very precisely determine speed changes of the transmitter wheel by means of new time measurements.
It can easily be seen from the above example that when there is a fixed timing cycle, the count value obtained for a segment length depends on the speed of the transmitter wheel. In order to be independent of the speed with regard to the length of a segment, it is useful to carry out a standardization procedure. This can be done, for example, with reference to the count value for one complete revolution. In the above example, each ideal segment would then have the length 100/300, while in the real transmitter wheel of the example, the individual segments would have the lengths 101/300, 97/300, or 102/300. A certain one of the segments, though, can be referred to so that for example the first segment has the length 101/101, the second has the length 97/101, and the third has the length 102/101. This is particularly possible when no absolute measurement of speed is required, but it is sufficient to determine a percentage speed change. It is furthermore possible to arbitrarily set the length of any segment to one and to determine the length difference of the other segments from this chosen segment. In the exemplary case, this means that the second segment is 4/101 shorter than the first and in comparison, the third segment is 1/101 longer than the first.
It should be noted that it is quite unimportant to the invention how the length of a segment is detected, i.e. whether absolutely or relatively, whether with reference to one complete revolution or a chosen segment, or whether as a difference.
With the dev

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