Method and apparatus for maintaining stoichiometric air-to-fuel

Details Method and apparatus for maintaining stoichiometric air-to-fuel Method and apparatus for maintaining stoichiometric air-to-fuel

1992-10-29

1993-05-18

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123406, F02M 700

Patent

active

052111547

ABSTRACT:
This invention provides an self-calibrating buffer amplifier for a Universal Exhaust Gas Oxygen sensor interface circuit which couples and processes a voltage signal proportional to pumping cell current to a level and reference voltage suitable for input to an A-to-D convertor. The goal of this invention is to increase the accuracy of air-to-fuel ratio control by continually correcting for the effects of offset quantities in the amplifier stage necessary to the interface circuitry. This goal is accomplished by an approach which effectively generates and subtracts these offset quantities from the processed signal.

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