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: The invention relates to a method of operating an internal combustion engine having at least one mode of operation in which combustion substantially relies on autoignition of a compression ignitable homogeneous fuel/air mixture, more specifically of a gasoline/air mixture, the temperature in the combustion chamber being controlled by exhaust gas recirculation. To increase the charge temperature in the combustion chamber in the simplest possible manner, there is provided that the residual gases be recirculated through at least one catalyst disposed in the exhaust duct in proximity to the engine.

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 an internal combustion engine with a six-stroke process involving the following sequence of events: 1st stroke (I): air intake into the combustion chamber, 2nd stroke (II): compression of the air and injection (3a) of a first fraction of gasoline fuel into the combustion chamber, 3rd stroke (III): first working stroke after first ignition (5) of the mixture, said ignition (5) being initiated by an ignition device, 4th stroke (IV): new compression of the contents of the combustion chamber, 5th stroke (V): second working stroke after second ignition (6) of the fuel-air mixture contained in the combustion chamber, 6th stroke (VI): expulsion of the exhaust gases from the combustion chamber, a second fraction of gasoline fuel being injected (3b) prior to the second ignition (6).

Abstract: The invention relates to a method of operating an internal combustion engine with a six-stroke process involving the following sequence of events:

Abstract: The invention relates to a method for operating an internal combustion engine which is operated in at least one engine operation range in a substantially homogeneous self-ignited manner and in at least a second engine operation range in a substantially homogeneous spark-ignited manner, with a changeover occurring during engine operation between homogeneous self-ignited operation and homogeneous spark-ignited operation depending on the load and vice-versa.

Abstract: The invention relates to a method of operating an internal combustion engine that relies for operation, in at least one operational range of the engine, on the autoignition of an at least almost homogeneous fuel-air mixture, the combustion being measured and at least one parameter for the combustion in the next cycle being set in function of a signal obtained from this measurement. In order to reduce fuel consumption and emissions and to achieve direct conversion of the load requirements, there is provided that the four cycle internal combustion engine relies for operation, in at least one second operational range, on the spark ignition of an at least almost homogeneous fuel-air mixture and that the combustion event is controlled, both in the first and in the second operational range of the engine, largely independent of the torque of the internal combustion engine.

Abstract: The invention relates to a method of operating an internal combustion engine having at least one mode of operation in which combustion substantially relies on autoignition of a compression ignitable homogeneous fuel/air mixture, more specifically of a gasoline/air mixture, the temperature in the combustion chamber being controlled by exhaust gas recirculation. To increase the charge temperature in the combustion chamber in the simplest possible manner, there is provided that the residual gases be recirculated through at least one catalyst disposed in the exhaust duct in proximity to the engine.

Abstract: The invention relates to a method for determining the position of the combustion in a combustion chamber of an internal combustion engine. In order to enable an early determination of the 50% mass conversion point it is provided that the maximum value of the heating progress of the combustion is determined, that the 50% mass conversion point is assigned in a temporal respect to the maximum value of the heating progress, and that the temporal assignment of the 50% mass conversion point to the maximum value of the heating progress occurs prior to the end of the combustion.

Abstract: The invention relates to an internal combustion engine run on Otto fuel which may be compression ignition operated in a first operational range (HCCI) and spark ignition operated in a second operational range (SI), with means for adjusting valve timing of at least one intake valve (7) and of at least one exhaust valve (8), with at least one ignition equipment (18) and at least one direct injection equipment (17) in each cylinder (1). To permit in the easiest possible way compression ignition and spark ignition operation on Otto fuel, there is provided at least one intake camshaft (9) for actuating the intake valves (7) and at least one exhaust camshaft (10) for actuating the exhaust valves (8), that at least one intake valve (7) in each cylinder (1) is movable between a first and a second lift position by a device for changing the valve lift (11), and that at least one exhaust valve (8) is actuatable by a residual gas recirculation system (13) during the intake lift.

Abstract: The invention relates to a method for controlling the operation of an internal combustion engine that is operated, in at least one operational range, with a homogeneous charge compression ignition mode, combustion history being monitored and evaluated by measuring at least one parameter relevant to combustion selected from the group comprising the start of combustion, the duration of combustion and the rate of combustion, and at least one parameter relevant to combustion being controlled, for subsequent combustion events, on account of the evaluation of the combustion. In order to stabilize combustion in the homogeneous charge compression ignition mode of operation in the easiest possible way, the inventors propose to vary the level of turbulence in the combustion chamber for the purpose of controlling combustion, the level of turbulence being temporarily raised to stabilize combustion.

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: The invention relates to a method for determining the position of the combustion in a combustion chamber of an internal combustion engine. In order to enable an early determination of the 50% mass conversion point it is provided that the maximum value of the heating progress of the combustion is determined, that the 50% mass conversion point is assigned in a temporal respect to the maximum value of the heating progress, and that the temporal assignment of the 50% mass conversion point to the maximum value of the heating progress occurs prior to the end of the combustion.

Abstract: The invention relates to a method for controlling the operation of an internal combustion engine that is operated, in at least one operational range, with a homogeneous charge compression ignition mode, combustion history being monitored and evaluated by measuring at least one parameter relevant to combustion selected from the group comprising the start of combustion, the duration of combustion and the rate of combustion, and at least one parameter relevant to combustion being controlled, for subsequent combustion events, on account of the evaluation of the combustion. In order to stabilize combustion in the homogeneous charge compression ignition mode of operation in the easiest possible way, the inventors propose to vary the level of turbulence in the combustion chamber for the purpose of controlling combustion, the level of turbulence being temporarily raised to stabilize combustion.

Abstract: The invention relates to an internal combustion engine run on Otto fuel which may be compression ignition operated in a first operational range (HCCI) and spark ignition operated in a second operational range (SI), with means for adjusting valve timing of at least one intake valve (7) and of at least one exhaust valve (8), with at least one ignition equipment (18) and at least one direct injection equipment (17) in each cylinder (1). To permit in the easiest possible way compression ignition and spark ignition operation on Otto fuel, there is provided at least one intake camshaft (9) for actuating the intake valves (7) and at least one exhaust camshaft (10) for actuating the exhaust valves (8), that at least one intake valve (7) in each cylinder (1) is movable between a first and a second lift position by a device for changing the valve lift (11), and that at least one exhaust valve (8) is actuatable by a residual gas recirculation system (13) during the intake lift.

Abstract: The invention relates to a method for operating an internal combustion engine which is operated in at least one engine operation range in a substantially homogeneous self-ignited manner and in at least a second engine operation range in a substantially homogeneous spark-ignited manner, with a changeover occurring during engine operation between homogeneous self-ignited operation and homogeneous spark-ignited operation depending on the load and vice-versa.

Abstract: The invention relates to a method of operating an internal combustion engine that relies for operation, in at least one operational range of the engine, on the autoignition of an at least almost homogeneous fuel-air mixture, the combustion being measured and at least one parameter for the combustion in the next cycle being set in function of a signal obtained from this measurement. In order to reduce fuel consumption and emissions and to achieve direct conversion of the load requirements, there is provided that the four cycle internal combustion engine relies for operation, in at least one second operational range, on the spark ignition of an at least almost homogeneous fuel-air mixture and that the combustion event is controlled, both in the first and in the second operational range of the engine, largely independent of the torque of the internal combustion engine.