METHOD AND DEVICE FOR DETERMINING A RECOGNITION THRESHOLD
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Abstract
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.
21 Citations
15 Claims
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1-7. -7. (canceled)
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8. 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:
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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. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A device for determining a recognition threshold for recognizing a presence of a tooth or a tooth gap of a position sensor in front of a sensor, the device comprising:
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an interface to read 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; a unit to ascertain 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, and to ascertain 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; a unit to compute a first differential absolute value which represents a predetermined percentage of a difference between the first value based on the maximum value and the first value based on the minimum value of the sensor signal, and to compute 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 a unit to determine the recognition threshold, so that the 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, and to determine 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.
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15. A computer-readable storage medium storing program code to determine a first and a second recognition threshold for recognizing a present of teeth or tooth gaps of a position sensor in front of a sensor, the program code, when executed by a device, causing the device to perform:
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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 at least one 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.
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Specification