Control method for gas concentration sensor

Details Control method for gas concentration sensor Control method for gas concentration sensor

2005-03-22

2005-03-22

Warden, Jill (Department: 1743)

Measuring and testing

Gas analysis

With compensation detail

C073S001010, C073S001020, C073S023360, C073S023200, C073S023320, C422S083000, C422S098000, C436S143000

Reexamination Certificate

active

06868712

ABSTRACT:
An A/F signal proportional to an oxygen concentration in the exhaust gas from an internal combustion engine is output upon application of a voltage based on an instruction from a microcomputer. At the time an element resistance is detected, a bias instruction signal Vr from the microcomputer is converted by a D/A converter21to an analog signal Vb. An output voltage Vc obtained by removing high frequency components from the analog signal Vb through an LPF22is input to a bias control circuit40. During this time period in which the element resistance is detected, an accurate A/F signal is not output. Therefore, the A/F signal that has theretofore prevailed is held by a Sample/Hold circuit70to thereby prevent the use of an erroneous A/F signal. Namely, at the time of detecting the element resistance, the detected value of the oxygen concentration is prevented from becoming abnormal. As a result, an accurate A/F control can be executed using the detected element resistance.

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