Algorithm to correct for offset drift in cyclic signals
AssigneeSensata Technologies, Inc.
InventorsJan-Willem Sloetjes, Serge Groenhuijzen, Bart Jan Mathijs Salden
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Abstract
A method for correcting offset drift in a sensor used in cyclic sensing is provided. The method includes: identifying a target value for a parameter of a signal between sensing cycles of the sensor; ascertaining a difference between a measured value for the signal and the target value; ascertaining a duration between the sensing cycles; using the difference and the duration, calculating a number of steps to attain the target value from the measured value; and adjusting the measured value by the number of steps to substantially agree with the target value. A pressure sensor is disclosed.
Claims16
A method for correcting offset drift of a sensor used in cyclic sensing, the method comprising:
- identifying a target value for a parameter of a signal between sensing cycles of the sensor;
- ascertaining a difference between a measured value for the signal and the target value;
- ascertaining a duration between the sensing cycles;
- using the difference and the duration, calculating a number of steps to attain the target value from the measured value;
- and
- adjusting the measured value by the number of steps to substantially agree with the target value.
A pressure sensor configured for use in cyclic sensing, the sensor comprising:
- at least one piezoresistive element configured for sensing pressure and outputting voltage;
- a circuit configured for receiving the output voltage of the piezoresistive element and identifying a target value for the voltage for between sensing cycles of the sensor;
- ascertaining a difference between a measured value for the voltage and the target value;
- ascertaining a duration between the sensing cycles;
- using the difference and the duration, calculating a number of steps to attain the target value from the measured value;
- and, adjusting the output by the number of steps to substantially agree with the target value;
- and providing the adjusted output as a corrected output of the sensor.
Dependencies are inferred from the claim text.