Sensor bias drift compensation
AssigneeDelphi Technologies, Inc.
InventorsMichael Ik-Ming Chia, Seyed R. Zarabadi
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Abstract
A method of removing bias drift from the output signal of a sensor is provided. The method includes sensing a condition with a sensor and generating an output signal, differentiating the output signal, and comparing the differentiated output signal with a threshold change. The method also includes the steps of determining the presence of bias drift based on the comparison, generating a bias adjustment command signal based on the determined presence of bias drift, and adjusting the sensed signal generated by the sensor in accordance with the bias adjusted command signal so as to remove bias drift from the output signal.
Claims20
A method of compensating for bias drift in a signal produced by a sensor, said method comprising the steps of:
- sensing a condition with a sensor and generating an output signal indicative of the sensed condition;
- differentiating the output signal by computing a difference in the output signal during a time period;
- comparing the differentiated output signal with a threshold change;
- determining presence of a bias drift in the output signal based on said comparison;
- generating a bias adjustment command signal based on said determined presence of bias drift;
- and
- adjusting the output signal generated by the sensor in accordance with the bias adjusted command signal so as to remove the bias drift from the output signal.
A sensor having bias compensation for removing bias drift error for an output signal, said sensor comprising:
- a sensing element for sensing a condition and generating an output signal indicative of the sensed condition;
- and
- a bias compensation controller for determining the presence of a bias drift and generating a bias adjustment command signal to adjust the output signal to remove the bias drift, wherein said controller differentiates the output signal by computing a difference in the output signal during a time period, compares the differentiated output signal with a threshold change, and determines the bias adjustment command signal as a function of the comparison.
A bias removal device for removing bias drift error from an output signal generated by a sensor, said bias removal device comprising:
- a bias compensation controller for receiving an output signal from a sensor and determining the presence of bias drift, said controller generating a bias adjustment command signal to adjust the sensed output signal to remove the bias drift, wherein said controller differentiates the output signal by computing a difference in the output signal during a time period, compares the differentiated output signal with a threshold change, and determines the bias adjustment command signal as a function of the comparison.
Dependencies are inferred from the claim text.