Abstract: The invention relates to a method for operating a reciprocating piston machine, particularly an internal combustion engine, having at least one piston rod that is hydraulically adjustable in length for setting a compression ratio, wherein the piston rod comprises a piston and a hydraulic cylinder for adjusting its length, wherein the piston with the hydraulic cylinder delimits at least one working chamber, through the fill level of which at least two switching positions of the piston rod are possible, wherein independently from the setting of the compression ratio the working chamber is at least partially filled and emptied as a function of at least one first predetermined requirement to effect an at least partial exchange of a hydraulic medium in the at least one working chamber.

Abstract: The invention relates to a method for operating a reciprocating piston machine, particularly an internal combustion engine, having at least one piston rod that is hydraulically adjustable in length for setting a compression ratio, wherein the piston rod comprises a piston and a hydraulic cylinder for adjusting its length, wherein the piston with the hydraulic cylinder delimits at least one working chamber, through the fill level of which at least two switching positions of the piston rod are possible, wherein independently from the setting of the compression ratio the working chamber is at least partially filled and emptied as a function of at least one first predetermined requirement to effect an at least partial exchange of a hydraulic medium in the at least one working chamber.

Abstract: The invention relates to a liquefied petroleum gas direct injection engine (100) comprising at least one cylinder comprising a combustion chamber (1) having a spark plug (2), one or more intake valve or valves (4) and one or more exhaust valve or valves (5). The LPG engine (100) further comprises at least one injector (6) for injecting liquefied petroleum gas in liquid state directly into the combustion chamber, the LPG being injected at a pre-established pressure value; a high pressure pump (9) for feeding pressurized liquefied petroleum gas to at least one injector (6); and an electronic control unit (13) configured to operate the at least one injector (6) for injecting the LPG during a specific injection time period or periods such that a predefined target mass of liquefied petroleum gas is injected, and between 360° BTDC and 60° BTDC of the engine cycle. The invention also refers to a control method of a liquefied petroleum gas direct injection engine (100).

Abstract: For the establishment of a crank-angle based signal pattern with high discrimination representing a relevant working characteristic of an internal combustion engine, the working characteristic is detected with high time discrimination and with the aid of a time-based and angled-based crank-angle signal of low angle discrimination and transformed to a crank-angle basis under interpolation, and whereby there is assigned to the top dead center (OT) of the respective cylinder, by a multiple, a freely selectable angle increment under interpolation with high angle discrimination.

Abstract: The invention relates to a method of operating a direct injection internal combustion engine operated on both spark-ignitable and autoignitable fuel, more specifically on gasoline, wherein the operational range of the engine is allocated autoignition ranges and spark-ignition ranges, an at least nearly homogeneous fuel-air mixture being produced in the combustion chamber in autoignition ranges, a high compression ratio suitable for spontaneous ignition of the fuel being provided and the combustion in the autoignition range being mostly initiated by spontaneous ignition, and wherein, in the ranges of spark ignition, combustion is initiated by spark ignition of said air-fuel mixture and a spark ignition range is assigned to the full load range and an autoignition range assigned to at least part of the part load range and wherein the effective compression ratio is lowered in spark ignition ranges and combustion controlled by regulating the residual gas content in the ranges of spontaneous ignition.

Abstract: For the establishment of a crank-angle based signal pattern with high discrimination representing a relevant working characteristic of an internal combustion engine, the working characteristic is detected with high time discrimination and with the aid of a time-based and angled-based crank-angle signal of low angle discrimination and transformed to a crank-angle basis under interpolation, and whereby there is assigned to the top dead center (OT) of the respective cylinder, by a multiple, a freely selectable angle increment under interpolation with high angle discrimination.

Abstract: The invention relates to a method of operating a direct injection internal combustion engine operated on both spark-ignitable and autoignitable fuel, more specifically on gasoline, wherein the operational range of the engine is allocated autoignition ranges and spark-ignition ranges, an at least nearly homogeneous fuel-air mixture being produced in the combustion chamber in autoignition ranges, a high compression ratio suitable for spontaneous ignition of the fuel being provided and the combustion in the autoignition range being mostly initiated by spontaneous ignition, and wherein, in the ranges of spark ignition, combustion is initiated by spark ignition of said air-fuel mixture and a spark ignition range is assigned to the full load range and an autoignition range assigned to at least part of the part load range and wherein the effective compression ratio is lowered in spark ignition ranges and combustion controlled by regulating the residual gas content in the ranges of spontaneous ignition.