Patent ID: 8166959

Claim:
In a cylinder of a directly injected internal combustion engine, a method comprising: in a four stroke engine: operating the cylinder with negative valve overlap by closing an exhaust valve of a cylinder of the engine and opening an intake valve of the cylinder after the exhaust valve of the cylinder has closed; expanding a volume of the cylinder at least until a pressure within the cylinder is reduced to below an intake manifold pressure by moving a piston of the cylinder away from top dead center for at least a portion of between the closing of the exhaust valve and the opening of the intake valve; initiating an injection of a fuel blend directly into the cylinder via an in-cylinder injector after the exhaust valve has closed, the fuel blend including a mixture of gasoline and an alcohol, the alcohol including methanol; and adjusting at least an intake and/or exhaust valve timing responsive to an amount of the alcohol in the fuel blend.