Engine air/fuel control system with catalytic converter and exha

Details Engine air/fuel control system with catalytic converter and exha Engine air/fuel control system with catalytic converter and exha

1994-12-19

1996-03-19

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60278, 60285, F01N 320

Patent

active

054995000

ABSTRACT:
An engine air/fuel control system is shown (300-428) responsive to a feedback variable derived (410-428) from an exhaust gas oxygen sensor (16) positioned upstream of a catalytic converter (20). A non-catalytic exhaust gas oxygen sensor (24) having a non-catalytic electrode (490) positioned in the engine exhaust downstream of the converter (20) is coupled to a current pumping circuit (28). Current is pumped into an electrode of the downstream sensor (24) shifting its output step change towards richer air/fuel ratios. Pumping current is gradually increased in amplitude until the downstream sensor (24) incurs a change in its output state (602-634). The pumping current occurring at the time of such change in output states provides a measurement of catalyst efficiency.

REFERENCES:
patent: 5099647 (1992-03-01), Hamburg
patent: 5268086 (1993-12-01), Hamburg et al.
patent: 5313791 (1994-05-01), Hamburg
patent: 5363091 (1994-11-01), Kotwicki
patent: 5375413 (1994-12-01), Hamburg
patent: 5379590 (1995-01-01), Hamburg

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