Method for detecting rotational speed
AssigneeSiemens Aktiengesellschaft
InventorsRalf Bohnig, Achim Przymusinski, Christian Stahl
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Abstract
In a method for detecting rotational speed of an internal combustion engine (1), a sector wheel (4) which is driven by the internal combustion engine (1) is scanned, the throughflow of a specific segment of the sector wheel is detected, the duration of said segment-throughflow is measured and a rotational speed value is determined therefrom. Additionally, the throughflow of a specific part of the segment is detected before and after determination of the rotational speed value and a gradient of the duration of the partial segment throughflow is determined in order to update the rotational speed value.
Claims16
A method for ascertaining the rotational speed of an internal combustion engine, comprising the steps of:
- a) scanning a sector wheel which is driven by the internal combustion engine,
- b) detecting a pass of a specific segment of the sector wheel, measuring the duration of this segment pass and ascertaining a rotational speed value therefrom,
- c) detecting a pass of a specific part of the segment before and after ascertaining the rotational speed value, and ascertaining a gradient of the duration of the part-segment pass, and
- d) associating the rotational speed value with the gradient in order to update the rotational speed value.
A method for ascertaining the rotational speed of an internal combustion engine, comprising the steps of:
- a) scanning a sector wheel which is driven by the internal combustion engine,
- b) measuring the duration of the pass of a specific segment of the sector wheel and evaluating a rotational speed value therefrom,
- c) detecting a pass of a specific part of the segment before and after evaluating the rotational speed value, and evaluating a gradient of the duration of the part-segment pass, and
- d) associating the rotational speed value with the gradient in order to update the rotational speed value.
An arrangement for ascertaining the rotational speed of an internal combustion engine, comprising:
- a) a sensor for scanning a sector wheel which is driven by the internal combustion engine,
- b) means for detecting a pass of a specific segment of the sector wheel, measuring the duration of this segment pass, and ascertaining a rotational speed value therefrom,
- c) means for detecting a pass of a specific part of the segment before and after ascertaining the rotational speed value, and ascertaining a gradient of the duration of the part-segment pass, and
- d) means for associating the rotational speed value with the gradient in order to update the rotational speed value.
Dependencies are inferred from the claim text.