Method of setting switching points for a sensor output signal
AssigneeSiemens Aktiengesellschaft
InventorDieter Draxelmayr
Life of this patent
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Abstract
The sensor configuration has a sensor and a calibration circuit, which self-calibrates the system by setting its switching points. The calibration circuit is located in the output circuit of the sensor. The method utilizes the calibration circuit to set an offset in the output circuit using an offset D/A converter in such a way that the switching points coincide with reference values. The offset D/A converter is driven with a calibration logic unit.
Claims2
A method of setting switching points in a system driven by a sensor configuration with a sensor generating an output signal having upper and lower signal peaks, which comprises the following steps:
- determining switching points for a selectable ratio between an upper reference value and a lower reference value;
- comparing the upper and lower reference values with upper and lower signal peaks in the output signal of the sensor;
- fixing a ratio between the signal peaks of the output signal by readjusting an offset of the output signal whenever an asymmetrical signal position is detected;
- simultaneously postadjusting the reference values to the upper and lower signal peaks equally quickly and in opposite directions whenever the upper and lower reference values are situated between the signal peaks or the signal peaks are situated between the upper and lower reference values;
- and
- continually repeating the comparing, fixing and postadjusting steps.
Dependencies are inferred from the claim text.