Patent ID: 8205583

Claim:
A method of operating an engine including at least a first cylinder and a second cylinder, the method comprising: operating the first cylinder of the engine to provide a net flow of gases from an intake manifold to an exhaust manifold while combusting a mixture including said gases in said first cylinder during each cycle of the first cylinder; during said operation of the first cylinder, operating the second cylinder of the engine to provide a net flow of gases from the exhaust manifold to the intake manifold, wherein said net flow of gases from the exhaust manifold to the intake manifold includes at least a portion of said combusted mixture by the first cylinder; and performing combustion in the second cylinder while providing said net flow of gases to the intake manifold from the exhaust manifold, wherein said combustion is performed with a stratified charge of fuel and said gases within the second cylinder, said stratified charge lean of stoichiometry.