Patent ID: 8191516
Filing Date: 2012-06-05
Classification: F01P,F02D,Y02T

Abstract:
1. A method comprising: opening an intake valve of an engine to provide an air flow to a combustion chamber of the engine defined by a cylinder bore and a piston disposed therein during a first stroke, the first stroke forming an intake stroke; closing the intake valve; determining an engine operating temperature; comparing the engine operating temperature to a predetermined temperature limit; providing a first fuel mass to the combustion chamber between an end portion of a second stroke immediately subsequent to the first stroke and a beginning portion of a third stroke immediately subsequent to the second stroke, the third stroke forming a first power stroke and the intake valve and an exhaust valve in communication with the combustion chamber being closed during the second and third strokes; and maintaining the exhaust valve in a closed position during a fourth stroke immediately subsequent to the third stroke when the engine operating temperature is less than the predetermined temperature limit to prevent exhaust gas from exiting the combustion chamber during the fourth stroke.