Current replication circuit and method for use in exhaust gas ox

Details Current replication circuit and method for use in exhaust gas ox Current replication circuit and method for use in exhaust gas ox

1994-05-11

1995-07-04

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 700

Patent

active

054291054

ABSTRACT:
A method and circuit for generating an output signal representative of the pumping current required to equalize the oxygen diffusion between the sensing cell and the pumping cell of an oxygen-ion concentration proportional sensor located in the exhaust system of an internal combustion engine. A replication current, which is isolated from but representative of the pumping current, is generated. The replication current is then passed through a load resistance for generating the output signal. The replication current is generated simultaneously with but isolated from the pumping current, thereby eliminating the need for separate amplification of a sensed version of the pumping current.

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8090A IEEE Transactions on Circuits and Systems, I: Fundamental Theory and Applications 39 (1992) Oct., No. 10, New York, U.S.

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