초록 ▼

A method is provided for improving the performance of an internal combustion engine, comprising the steps of inducting a charge of fluid into the combustion chamber of the engine, holding the intake valve of the combustion chamber open during a portion of the compression stroke of the piston in the

A method is provided for improving the performance of an internal combustion engine, comprising the steps of inducting a charge of fluid into the combustion chamber of the engine, holding the intake valve of the combustion chamber open during a portion of the compression stroke of the piston in the combustion chamber, expelling a portion of the inducted charge from the combustion chamber by movement of the piston in its compression stroke while the intake valve is held open, preventing the expelled portion of the inducted charge from communicating with the atmosphere by providing a check valve between the induction manifold and the atmosphere, the check valve only permitting flow in the direction from the atmosphere into the induction manifold; and closing the intake valve during the remainder of the compression stroke and after the portion of the induction charge is expelled.

대표청구항 ▼

A method for improving engine performance for a multi-cylinder internal combustion engine, the engine having more than one combustion chamber with a member for varying the volume of same, a crankshaft, a single induction manifold disposed between the atmosphere and at least two combustion chambers,

A method for improving engine performance for a multi-cylinder internal combustion engine, the engine having more than one combustion chamber with a member for varying the volume of same, a crankshaft, a single induction manifold disposed between the atmosphere and at least two combustion chambers, at least one intake valve disposed between each combustion chamber and the induction manifold, at least one of said valves beginning to open to start an induction process when the angular position of the crankshaft is at an opening angular position for said valve and the induction process being ended when the crankshaft is at a closing angular position and the last one of said intake valves closes, and a variable valve timing system for changing the timing of the induction process via control of at least one of said valves in compliance with predetermined operating conditions of the engine, the variable valve timing system including a camshaft having at least one splittable cam member with camlobe members for actuating the at least one intake valve, the method comprising: a. beginning a first engine cycle by inducting a first charge of fluid into at least one of the combustion chambers during a first induction period, said first induction period beginning at a first crankshaft opening angular position and ending at a first crankshaft closing angular position; b. holding the at least one intake valve open during a portion of the compression stroke of the volume varying member; c. expelling a portion of the inducted charge from the combustion chamber through said intake valve before the crankshaft reaches said first crankshaft closing angular position; d. preventing the expelled portion of the inducted charge from communicating with the atmosphere; e. closing the at least one intake valve to terminate expulsion of said portion of the inducted charge; f. making an adjustment to the camshaft to change the timing of the induction period; g. after changing the timing of the induction period, beginning a second engine cycle by inducting a second charge of fluid into the combustion chamber during a second induction period beginning at a second crankshaft opening angular position and ending at a second crankshaft closing angular position; h. expelling a portion of the second inducted charge from the combustion chamber through said intake valve before the crankshaft reaches said second crankshaft closing angular position; i. preventing the expelled portion of the second inducted charge from communicating with the atmosphere; and j. closing the at least one intake valve to terminate expulsion of said portion of the second inducted charge.