COMPENSATOR CIRCUITRY AND METHOD FOR AN OXYGEN SENSOR

Compensator circuitry (200) is provided for an oxygen sensor (1) which includes a pump cell (5) and a reference cell (4). The compensator circuitry (200) includes a feedback control loop which maintains the reference cell (4) at a reference voltage. The feedback control loop includes a digital compe...

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Bibliographische Detailangaben
Hauptverfasser:	GOSE, Mark, RIPLEY, Eugene V, CAMPBELL, Jerry W, ENGELHARDT, Marc R, HOU, Jingyi
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	Compensator circuitry (200) is provided for an oxygen sensor (1) which includes a pump cell (5) and a reference cell (4). The compensator circuitry (200) includes a feedback control loop which maintains the reference cell (4) at a reference voltage. The feedback control loop includes a digital compensator (43) which determines and outputs a compensation current to the pump cell (5) dependent on a reference voltage measured from the reference cell (4). The digital compensator (43) also suspends the determination and output of the compensation current for a set time which is dependent on detection of edges in an oxygen sensor heater Pulse Width Modulation signal.