Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-03-31
1996-08-13
Heyman, Leonard E.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, 60285, F01N 310
Patent
active
055444814
ABSTRACT:
An air/fuel control system (10) and method for an engine (28) coupled to a catalytic converter (50) includes monitoring of the converter (50). Engine air/fuel ratio is controlled (104-178) in response to a pair of two-state signals generated by comparing the outputs of respective upstream (44, 55) and downstream (52) exhaust gas oxygen sensors to a reference voltage. The transitions in the downstream sensor are indicated when a difference in its output amplitude changes signs and a difference between stored peak values occurring during two successive changes in the sign exceeds a predetermined value (200-350). Converter efficiency is indicated from a ratio of transitions in the downstream sensor transitions to transitions in the upstream sensor output which are generated in a similar manner (690-770).
REFERENCES:
patent: 5272872 (1993-12-01), Grutter et al.
patent: 5289678 (1994-03-01), Grutter
patent: 5337556 (1994-08-01), Aihara
patent: 5357751 (1994-10-01), Orzel
patent: 5385016 (1995-01-01), Zimlich et al.
patent: 5386693 (1995-02-01), Orzel
patent: 5396875 (1995-03-01), Kotwicki et al.
Davey Christopher K.
Dickison Donald F.
Jerger Robert J.
Ford Motor Company
Heyman Leonard E.
Lippa Allan J.
May Roger L.
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