Method and device for determining a recognition threshold

摘要

A method for determining a recognition threshold for recognizing the presence of a tooth or a tooth gap of a position sensor in front of a sensor is presented. The method includes a step of reading in a sensor signal which represents a variation over time of a measured magnetic field when the teeth and the tooth gaps of the position sensor are passed by the sensor. In addition, the method includes a step of ascertaining from the sensor signal a first value based on a minimum value of the sensor signal and a first value based on a maximum value of the sensor signal within a predefined time interval. The method also includes a step of computing a differential absolute value which represents a predetermined percentage of a difference between the value based on the at least one maximum value and a value based on the at least one minimum value of the sensor signal. Lastly, the method includes a step of determining the recognition threshold, so that the recognition threshold represents a value that corresponds to a result of adding the differential absolute value to the first value based on the minimum value of the sensor signal.

主权项

1. A method for determining a first and a second recognition threshold for recognizing a presence of teeth or tooth gaps of a position sensor in front of a sensor, the method comprising:
reading in a sensor signal which represents a variation over time of a measured magnetic field when the teeth and the tooth gaps of the position sensor are passed by the sensor; ascertaining from the sensor signal a first value based on a minimum value of the sensor signal and a first value based on a maximum value of the sensor signal within a predefined time interval; computing a first differential absolute value which represents a predetermined percentage of a difference between the first value based on the maximum value of the sensor signal and the first value based on the minimum value of the sensor signal; determining a first recognition threshold, so that the first recognition threshold represents a value that corresponds to a result of adding the first differential absolute value to the first value based on the minimum value of the sensor signal; ascertaining from the sensor signal a second value based on a minimum value of the sensor signal and a second value based on a maximum value of the sensor signal within a second predefined time interval subsequent to the predefined time interval; computing a second differential absolute value which represents a second predetermined percentage of a difference between the second value based on the maximum value and the second value based on the minimum value of the sensor signal; and determining a second recognition threshold, which is different from the first recognition threshold, so that the second recognition threshold represents a value that corresponds to a result of adding the second differential absolute value to the second value based on the minimum value of the sensor signal, wherein the method provides for precise determination of a position of the teeth or the gaps of the position sensor.