Method of controlling egr for internal combustion engines

F - Mech Eng,Light,Heat,Weapons – 02 – B

Patent

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123/98.05

F02B 47/08 (2006.01) F02D 37/02 (2006.01) F02M 1/10 (2006.01) F02M 3/06 (2006.01) F02M 7/28 (2006.01) F02M 11/02 (2006.01) F02M 25/07 (2006.01) F02M 25/08 (2006.01)

Patent

CA 1168529

ABSTRACT OF THE DISCLOSURE An internal combustion engine has a primary intake pas- sage including a primary throttle valve for supplying engine cyl- ingers with an air-fuel mixture under a full range of loads, a sec- ondary intake passage including a secondary throttle valve for sup- plying 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 recircu- lation 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 pas- sage comes into operation, fuel vapor is introduced from a canister into the secondary intake passage. - 14 -

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