Patent ID: 6564758
Filing Date: 2003-05-20
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method for operating an internal combustion engine with variable gas exchange control times, selectively in one of at least two different operating modes, the at least two operating modes including a normal operating mode, an exhaust-gas holding operating mode, an exhaust-gas filling operating mode and an additional-stroke operating mode, the method comprising the steps of:in the exhaust-gas holding operating mode, in accordance with at least one combustion space and at least part of successive working cycles, inserting a compression phase and an expansion phase after a combustion and expansion phase, maintaining an outlet valve closed in the compression phase and opening the outlet valve one of during a subsequent expansion phase and at a commencement of a following gas expulsion phase; in the exhaust-gas filling operating mode, in accordance with at least one combustion space and at least part of successive working cycles, maintaining an inlet valve closed and the outlet valve open during a gas intake phase, subsequently inserting a compression phase and an expansion phase, maintaining the outlet valve closed in the compression phase and opening the outlet valve one of during the subsequent expansion phase and at a commencement of a following gas expulsion phase; and in the additional-stroke operating mode, in accordance with at least one combustion space and at least part of successive working cycles, performing two compression phases and two expansion phases, a first one of the two compression and expansion phases including a fuel combustion action and a second one of the two compression and expansion phases including one of a fuel combustion action and an exhaust/emission control measure.