Control of exhaust gas stoichiometry with inducted secondary...

Details Control of exhaust gas stoichiometry with inducted secondary... Control of exhaust gas stoichiometry with inducted secondary...

2007-05-15

2007-05-15

Vo, Hieu T. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S676000, C060S285000

Reexamination Certificate

active

11482082

ABSTRACT:
A method for operating a marine engine uses four valves to control the flow of secondary air that is inducted into each of the cylinders of an engine. An oxygen sensor is disposed in an exhaust passage downstream from the cylinders and upstream from a catalytic converter. A carburetor is calibrated to provide a richer than stoichiometric air/fuel ratio so that inducted secondary air through the valves associated with each cylinder can result in a stoichiometric ratio of air flowing into each cylinder. The cylinders are each provided with their own valve in order to allow the air/fuel ratios to be equalized for each cylinder regardless of the configuration and geometry of the intake manifold and its associated conduits.

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