Method of controlling EGR for internal combustion engines

Details Method of controlling EGR for internal combustion engines Method of controlling EGR for internal combustion engines

1982-03-23

1983-10-25

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

123407, 123411, 123518, 123521, 123 1R, F02M 2506, F02P 500, F02M 3302

Patent

active

044112416

ABSTRACT:
An internal combustion engine has a primary intake passage including a primary throttle valve for supplying engine cylingers with an air-fuel mixture under a full range of loads, a secondary intake passage including a secondary throttle valve for supplying the engine cylinders with an air-fuel mixture under high loads, and an exhaust-gas recirculation passage including an exhaust-gas recirculation valve for introducing an exhaust gas into the primary intake passage. Vacuums at the primary and secondary throttle valves are utilized to control the exhaust-gas recirculation valve. A distributor for producing ignition sparks is also controlled by the vacuums at the primary and secondary throttle valves for ignition timing. The engine also includes a first mechanism for retarding ignition sparks and a second mechanism for promoting engine idling. When the exhaust-gas recirculation valve is controlled, the second mechanism is released, immediately thereafter air is introduced from the secondary intake passage into the primary intake passage for air-fuel ratio control therein, and the first mechanism is released. When the secondary intake passage comes into operation, fuel vapor is introduced from a canister into the secondary intake passage.

REFERENCES:
patent: 3294073 (1966-12-01), Bressan
patent: 3762384 (1973-10-01), Day et al.
patent: 3766896 (1973-10-01), Buehler et al.
patent: 3786793 (1974-01-01), Bohls et al.
patent: 3901202 (1975-08-01), Hollis, Jr. et al.
patent: 3908618 (1975-09-01), Tange et al.
patent: 3941105 (1976-03-01), Yagi et al.

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