Method of reducing the harmful emissions of a multicylinder inte

Details Method of reducing the harmful emissions of a multicylinder inte Method of reducing the harmful emissions of a multicylinder inte

1997-05-19

1998-07-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02D 2108, F02M 2507

Patent

active

057822263

ABSTRACT:
In a method for reducing harmful emissions of a multi-cylinder internal combustion engine including for each cylinder intake and exhaust passages with intake and exhaust valves and an exhaust gas recirculation passage extending between an exhaust passage and the interior of a cylinder and including an exhaust gas recirculation valve, the exhaust gas recirculation valve of a first cylinder is opened during the intake cycle of the first cylinder at the beginning of the exhaust cycle of a second cylinder associated with the first cylinder and the exhaust gas recirculation valve is closed when the exhaust gas pressure in the exhaust gas recirculation passage from the second cylinder to the first cylinder falls below the combustion chamber pressure in the first cylinder or the charge air pressure in its intake passage or when a predetermined amount of exhaust gas has been recirculated.

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