Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1975-10-30
1977-11-08
Nilson, Robert G.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
123119R, 123119D, 261121B, F02D 3300, F02D 3500
Patent
active
040569322
ABSTRACT:
With respect to an internal combustion engine equipped with a carburetor and a catalytic converter which requires to feed the engine with a stoichiometric air/fuel mixture, the control system is for regulating the air/fuel ratio produced in the carburetor and comprises an auxiliary air admitting passage connected to the fuel discharge passage of the carburetor in addition to a usual air bleed passage for the fuel discharge passage, an electromagnetic valve for controlling the admission of air into the auxiliary passage, an oxygen sensor disposed in the exhaust system upstream of the catalytic converter, and a control circuit for producing continual pulses at a frequency between 5 and 100 Hz. The widths of the individual pulses are increased gradually while the output of the oxygen sensor indicates the air/fuel ratio being below the stoichiometric ratio, and vice versa. The valve is opened as each pulse is applied thereto so that the air feed rate to the fuel in the fuel passage is momentarily augmented by admission of air into the auxiliary passage.
REFERENCES:
patent: 2939673 (1960-06-01), Rosholt
patent: 3693947 (1972-09-01), Masaki
patent: 3765387 (1973-10-01), Knapp
patent: 3861366 (1973-04-01), Masaki
patent: 3921612 (1975-11-01), Aono
patent: 3942493 (1976-03-01), Linder
patent: 3963009 (1976-06-01), Mennesson
Nakamura Koyo
Sanbuichi Hiroshi
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Nilson Robert G.
Nissan Motor Co,. Ltd.
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