Patent ID: 7201121

Claim:
A method of operating an internal combustion engine including at least one cylinder and a piston slidable in the cylinder, the method comprising: supplying pressurized air from an intake manifold to an air intake port of a combustion chamber in the cylinder; operating an air intake valve to open the air intake port to allow pressurized air to flow between the combustion chamber and the intake manifold substantially during a majority portion of a compression stroke of the piston, wherein said operating includes operating a fluidically driven actuator to keep the intake valve open, wherein said fluidically driven actuator is associated with a source of low pressure fluid and a source of high pressure fluid, wherein said operating of the air intake valve further includes placing at least one of the low and high pressure fluids in flow communication with the fluidically driven actuator, and wherein the operation of the air intake valve is based on at least one engine condition.