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US 2017/0356894 A1Published application
Method for Operating an Oxygen Sensor, Computer Program Product and Oxygen Sensor
AssigneeContinental Automotive GmbH
InventorsJohannes Ante, Markus Hien, Denny Schädlich
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Abstract
A method and apparatus for compensates for oxygen sensor aging determines a correction of by measuring oxygen content above a specified threshold value and measuring current flowing through the sensor over time.
Claims7
A method for operating an oxygen sensor having a sensor element for an intake tract of an internal combustion engine, wherein sensor element aging is compensated for as a function of sensor element operating time, the method comprising;
- measuring a pumping current required to pump oxygen through a zirconium membrane of the sensor;
- determining oxygen content by evaluating the equation:
- O2=r*(a+b*Ipump+c*Ipump2),
- wherein Ipump is the measured pumping current, a, b and c are factors for quadratic factory calibration, and r is the recalibration factor for aging compensation;
- and
- changing the value of r responsive to the operating time of the sensor element.
3 more elements
An apparatus comprising:
- an oxygen sensor comprising yttrium-stabilized zirconium oxide ceramic;
- a computer, operatively coupled to the oxygen sensor;
- a memory device operatively coupled to the computer and storing program instructions, which when executed cause the computer to:
- compensate for aging of the oxygen sensor as a function of an operating time of the oxygen sensor;
- the compensation comprising:
- measuring a pumping current required to pump oxygen through a zirconium membrane of the sensor;
- determining oxygen content by evaluating the equation:
- O2=r*(a+b*Ipump+c*Ipump2),
- wherein Ipump is the measured pumping current, a, b and c are factors for quadratic factory calibration, and r is the recalibration factor for aging compensation;
- and
- changing the value of r responsive to the operating time of the sensor element.
8 more elements
Dependencies are inferred from the claim text.