Combined split engine and closed loop mixture control operation

Details Combined split engine and closed loop mixture control operation Combined split engine and closed loop mixture control operation

1979-06-07

1981-06-23

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123198F, 60276, 60285, F01N 315

Patent

active

042743737

ABSTRACT:
A control system for a multi-cylinder internal combustion engine comprises a split engine control unit for operating the engine on partial cylinders when reduced engine power can adequately operate the vehicle, and first and second upstream exhaust conduits for directing exhaust gases from first and second group cylinders respectively to a common junction to which a downstream exhaust conduit is connected for emitting the gases to the atmosphere. A first set of an exhaust gas sensor and catalytic converter is disposed in the first conduit to be exposed to the stream of gases exhausted from the second group cylinders which are activated at all times and a second set of an exhaust gas sensor and catalytic converter is disposed in the common downstream conduit to be exposed to the stream of gases exhausted from the first group cylinders directed through the first conduit and to the gases passed through the upstream catalytic converter in the second conduit. A feedback control circuit is responsive selectively to a signal from the first gas sensor during the partial cylinder operation for correcting the mixture ratio to a rich side of stoichiometry to promote reduction of the NOx component in the upstream converter and oxidation of HC and CO components in the downstream converter, and to a signal from the second gas sensor during the full cylinder operation for correcting the mixture ratio to a point at or near stoichiometry to promote simultaneous reduction and oxidation processes in both of the converters.

REFERENCES:
patent: 2875742 (1959-03-01), Dolza
patent: 3765205 (1973-09-01), Frost
patent: 3765394 (1973-10-01), Francis
patent: 4000614 (1977-01-01), Abthoff et al.
patent: 4134261 (1979-01-01), Iizuka et al.
patent: 4143635 (1979-03-01), Iizuka et al.
patent: 4144864 (1979-03-01), Kato et al.
patent: 4149502 (1979-04-01), Johnson et al.

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