Compensated open-loop control of oxygen sensor heater

Details Compensated open-loop control of oxygen sensor heater Compensated open-loop control of oxygen sensor heater

2006-05-02

2006-05-02

Raevis, Robert (Department: 2856)

Measuring and testing

Gas analysis

Reexamination Certificate

active

07036351

ABSTRACT:
An oxygen sensor heater control determines heater activation based on an open-loop control parameter and a correction factor that compensates for part-to-part variability. Following a cold start where the heater temperature can be reliably estimated, the engine controller predicts the resistance of the heating element and heater circuit at the desired operating temperature of the sensor, and computes the correction factor for heater activation based on the predicted resistance values and nominal resistance values. At least one predicted value is stored in non-volatile memory, and used to compute the correction factor following a warm or hot start of the engine.

REFERENCES:
patent: 5001643 (1991-03-01), Domino et al.
patent: 6336354 (2002-01-01), Suzuki et al.
patent: 6742379 (2004-06-01), Matsubara et al.

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