A method of operating an engine in a delayed exhaust engine cycle may include opening an intake valve of the engine during a first stroke to form an intake stroke. The method may further include closing the intake valve and determining an engine operating temperature. The engine operating temperatur
A method of operating an engine in a delayed exhaust engine cycle may include opening an intake valve of the engine during a first stroke to form an intake stroke. The method may further include closing the intake valve and determining an engine operating temperature. The engine operating temperature may be compared to a predetermined temperature limit. A first fuel mass may be provided to the combustion chamber between an end portion of a second stroke and a beginning portion of a third stroke. The third stroke may form a first power stroke and the intake valve and an exhaust valve in communication with the combustion chamber may be closed during the second and third strokes. The exhaust valve may be maintained in a closed position during a fourth stroke when the engine operating temperature is less than the predetermined temperature limit.
대표청구항▼
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
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; andmaintaining 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. 2. The method of claim 1, wherein the maintaining includes switching an exhaust valve lift mechanism to a deactivated mode to prevent an exhaust cam lobe engaged therewith from opening the exhaust valve. 3. The method of claim 1, further comprising maintaining the intake valve in a closed position during a fifth stroke immediately subsequent to the fourth stroke when the engine operating temperature is less than the predetermined temperature limit. 4. The method of claim 3, wherein the maintaining the intake valve in the closed position includes switching an intake valve lift mechanism to a deactivated mode to prevent an intake cam lobe engaged therewith from opening the intake valve. 5. The method of claim 1, further comprising opening the exhaust valve during the fourth stroke to form an exhaust stroke when the engine operating temperature is greater than the predetermined temperature limit. 6. The method of claim 1, further comprising determining an oxygen level in the combustion chamber, the exhaust valve being maintained in the closed position during the fourth stroke when the engine operating temperature is less than the predetermined temperature limit and when the oxygen level is greater than a predetermined oxygen limit. 7. The method of claim 1, wherein the maintaining includes maintaining the intake and exhaust valves in the closed position for at least seven consecutive strokes immediately subsequent to the first stroke when the engine operating temperature is less than the predetermined temperature limit. 8. A method comprising: opening an intake valve of a diesel engine to provide an air flow to a combustion chamber of the diesel 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, maintaining the intake valve and an exhaust valve in communication with the combustion chamber in a closed position after the first stroke;maintaining the intake and exhaust valves in the closed position during a second stroke immediately subsequent to the first stroke, the second stroke forming a first compression stroke;maintaining the intake and exhaust valves being closed during a third stroke immediately subsequent to the second stroke;maintaining the intake and exhaust valves in the closed position during a fourth stroke immediately subsequent to the third stroke, the fourth stroke forming a second compression stroke, the exhaust valve being in the closed position preventing exhaust gas from exiting the combustion chamber during the fourth stroke;maintaining the intake and exhaust valves in the closed position during a fifth stroke immediately subsequent to the fourth stroke;maintaining the intake and exhaust valves in the closed position during a sixth stroke immediately subsequent to the fifth stroke, the sixth stroke forming a third compression stroke;maintaining the intake and exhaust valves being closed during a seventh stroke immediately subsequent to the sixth stroke; andproviding a first fuel mass to the combustion chamber to form a first power stroke during one of the third and seventh strokes. 9. The method of claim 8, further comprising opening the exhaust valve during an eighth stroke immediately subsequent to the seventh stroke and forming an exhaust stroke. 10. The method of claim 8, wherein the first fuel mass is provided to the combustion chamber between an end portion of the second stroke and a beginning portion of a third stroke to form the first power stroke during the third stroke. 11. The method of claim 10, further comprising providing a second fuel mass to the combustion chamber between an end portion of the sixth stroke and a beginning portion of the seventh stroke to form a second power stroke during the seventh stroke. 12. The method of claim 11, further comprising providing a third fuel mass between an end portion of the sixth stroke and a beginning portion of a seventh stroke immediately subsequent to the sixth stroke, the seventh stroke forming an intermediate power stroke. 13. The method of claim 8, further comprising maintaining the intake and exhaust valves closed during an eighth stroke immediately subsequent to the seventh stroke, the eighth stroke forming a fourth compression stroke. 14. The method of claim 13, further comprising maintaining the intake and exhaust valves closed during a ninth stroke immediately subsequent to the eighth stroke, a tenth stroke immediately subsequent to the ninth stroke, and an eleventh stroke immediately subsequent to the tenth stroke, the tenth stroke forming a fifth compression stroke. 15. The method of claim 14, wherein the first fuel mass is provided to the combustion chamber between an end portion of the second stroke and a beginning portion of a third stroke to form the first power stroke during the third stroke, the method further comprising providing a second fuel mass to the combustion chamber between an end portion of the sixth stroke and a beginning portion of the seventh stroke to form a second power stroke during the seventh stroke and providing a third fuel mass to the combustion chamber between an end portion of the tenth stroke and a beginning portion of a eleventh stroke immediately subsequent to the tenth stroke, the eleventh stroke forming a third power stroke. 16. The method of claim 8, wherein the intake and exhaust valves are maintained in the closed position while an oxygen content within the combustion chamber is greater than a predetermined oxygen limit. 17. The method of claim 16, wherein a maximum oxygen content in the combustion chamber occurs immediately subsequent to the intake stroke. 18. The method of claim 16, wherein the intake and exhaust valves are maintained in a closed position while an engine operating temperature is less than a predetermined temperature limit. 19. The method of claim 8, wherein the maintaining the intake and exhaust valves in the closed position includes placing intake and exhaust valve lift mechanisms in a deactivated mode preventing opening of the intake and exhaust valves by intake and exhaust cam lobes associated therewith. 20. The method of claim 19, further comprising switching the intake and exhaust valve lift mechanisms to an activated mode allowing opening of the intake and exhaust valves by the intake and exhaust cam lobes associated therewith, the intake and exhaust valves each being opened once per four consecutive strokes during the activated mode.
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