Air and fuel supply system for combustion engine

Abstract

A method of operating an internal combustion engine, including at least one cylinder and a piston slidable in the cylinder, may include supplying pressurized air from an intake manifold to an air intake port of a combustion chamber in the cylinder, selectively 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, and operably controlling a fuel supply system to inject fuel into the combustion chamber after the intake valve is closed.

1 . A variable compression ratio internal combustion engine, comprising: 
 an engine block defining at least one cylinder;    a head connected with said engine block, including an air intake port, and an exhaust port;    a piston slidable in each cylinder;    a combustion chamber being defined by said head, said piston, and said cylinder;    an intake manifold;    an air intake valve controllably movable to open and close the air intake port;    an air supply system including at least one turbocharger fluidly connected to the air intake port;    a fuel supply system operable to controllably inject fuel into the combustion chamber at a selected timing; and    a variable intake valve closing mechanism configured to keep the intake valve open by selective operation of the variable intake valve closing mechanism.    
   
   
       2 - 23 . (canceled)