Abstract: An electrohydraulic valve control (10) of an internal combustion engine includes at least one actuator (24) that acts on a gas exchange valve (38). This actuator (24) in turn has at least one working chamber (30), which in order to switch the actuator (24) from a first position into a second position, is connected to a high-pressure hydraulic accumulator (16) and shut off from a low-pressure return (56). In order to switch the actuator (24) from the second position back into the first position, the working chamber (30) is connected to the low-pressure return (56) and shut off from the high-pressure hydraulic accumulator (16). The pressure in the high-pressure hydraulic accumulator (16) is kept constant or reduced in a simple manner by virtue of the working chamber (30) being connected to the high-pressure hydraulic accumulator (16) and the low-pressure return (56) at the same time.

Abstract: An hydraulically controlled actuator (16) for activating a valve (10) is proposed, especially for activating a gas-exchange valve (10) in a combustion cylinder (11) of an internal combustion engine, which includes two fluid-filled pressure chambers (21, 22) having controllable chamber volumes and a movable operating piston (18) which delimits the pressure chambers (21, 22) by piston sides facing away from one another, the operating piston (18) acting upon the valve (10) and having an effective closing area acted upon by fluid pressure in the pressure chambers (21, 22) to close the valve (10) and an effective opening area acted upon by the fluid pressure to open the valve (10). To influence the kinematics of the opening and closing movement of the valve (10), the operating piston (18) is designed such that the surface area of at least one of the two effective areas changes along the sliding path of the operating piston (18).

Abstract: A hydraulic actuator for gas exchange valves of internal combustion engines is proposed, in which the lifting of the gas exchange valve from the valve seat is effected with great force. The opening motion of the gas exchange valve then ensues at reduced force. Upon closure of the gas exchange valve, the gas exchange valve is braked before striking the valve seat, so that operation of the gas exchange valve with little wear and little noise can be achieved (FIG. 1).

Abstract: An internal combustion engine having at least one combustion cylinder that includes a combustion chamber provided with gas-exchange valves, and an electrohydraulic valve control device having valve actuators that actuate the gas-exchange valves. To reduce manufacturing costs and/or the installation space required for the electrohydraulic valve control device, at least two synchronously controlled gas-exchange valves are connected using a coupling element to a common valve actuator, and the connection sites of the gas-exchange valves are flexibly formed on the coupling element.

Abstract: A gas exchange valve device (10) for an internal combustion engine (12), in particular of a motor vehicle, is provided with a hydraulic apparatus (15). This hydraulic apparatus (15) includes a fluid circuit (38, 42, 46, 54) and at least one pressure reservoir (62, 72) connected to the fluid circuit (38, 42,46, 54) and containing a piston (66, 76) prestressed by a device (68, 84), and also includes a controllable actuating device (16). A gas exchange valve (12) is also provided, whose valve element (26) is acted on by the actuating device (16). In order to achieve a simpler design of the gas exchange valve device (10), the invention proposes that the pressure reservoir (72) be disposed so that in an approximately unpressurized state of the pressure reservoir (72), its piston (76) at least indirectly locks the valve element (26) of the gas exchange valve (12) in an essentially closed position. (FIG.

Abstract: An apparatus for controlling gas exchange valves of an internal combustion engine is disclosed, which have hydraulic valve actuators (11) each assigned to one gas exchange valve, with one adjusting piston (13) acting on the gas exchange valve and two hydraulic work chambers (121, 122) defined by the adjusting piston (13), of which chambers the first work chamber (121), acting on the gas exchange valve (10) in the closing direction, is constantly filled with fluid that is under pressure, and the second work chamber (122), acting on the gas exchange valve (10) in the opening direction, can be filled with and relieved of fluid that is under pressure in alternation via a first and second electrical control valve (24, 25; 26, 27).

Abstract: The invention relates to an electrohydraulic valve controller, in particular for controlling a gas exchange valve in internal combustion engines, having a hydraulically actuatable control valve, whose including a control valve piston which can be acted upon, via electrically actuatable valves, by a hydraulic medium that is under pressure, and a hydraulically acting valve brake is assigned to the control valve piston. It is provided that the The valve brake (46) includes a temperature compensation for the hydraulic medium.

Abstract: A connection between a shaft end of a gas exchange valve of an internal combustion engine and a final control element of a valve actuator, with at least two shell-shaped wedge-shaped pieces, surrounding the shaft end and braced on the final control element, whose radially outer circumferential surface extends conically and which are surrounded by at least one conical clamping sleeve whose radially inner circumferential surface extends complimentary to the cone angle of the wedge-shaped pieces, wherein on the radially inner circumferential surface of the wedge-shaped pieces and on the radially outer circumferential surface of the shaft end of the gas exchange valve, protrusions and recesses that mesh with one another are provided.

Abstract: A method and a device for controlling a gas fill of a plurality of cylinders in an internal combustion engine having variable valve timing, in which a detection signal of a filling sensor is sampled with a sampling rate. Furthermore, a detection interval is determined for one cylinder. The sampling values for ascertaining a sampling-value sum are added up within this detection interval. In addition, a number of sampling values within the first detection interval are counted for ascertaining a first count value. The air mass filled into the first cylinder is then ascertained by forming a quotient from the sampling-value sum and the count value.

Abstract: A method and a device for operating an internal combustion engine including a plurality of cylinders, determine whether a torque of the internal combustion engine is above a torque threshold value. If the torque is less than the torque threshold value, all the cylinders of the engine are operated in a lean operating state. If the torque is greater than or equal to the torque threshold value, a first number of cylinders of the engine is operated in a homogeneous operating state, and the remaining cylinders of the engine are operated in the lean operating state.

Abstract: A method and a device for modifying a torque of an internal combustion engine including at least one first cylinder with an exhaust valve including a variable valve control, in which it is determined whether there is a demand for modifying the torque within a first working cycle of the at least one mfirst cylinder, and the basic triggering of the exhaust valve of the first cylinder is modified in the first working cycle when it is determined that it is necessary to modify the torque during the first working cycle.

Abstract: The invention relates to a device of the build-up of pressure in supply systems (6, 11, 20, and 23) to components (19, 36) on internal combustion engines (2). The invention includes directly couples lubricant systems and pressure-generating systems (3, 8), an electric fuel pump (34), as well as a control apparatus for determining lubricant pressures. A supply module (12, 34) is provided with an independent drive (16) and supplies lubricant in the lubricant oil circuit (24) or to selected lubricating position, or fuel into a fuel supply (36). The supply module (12, 34) can optionally include a pressure converter (30).

Abstract: An internal combustion engine (10) includes a hydraulic system (32) with a hydraulic pump (34). A lubricant system (14) for moving parts of the engine (10) is also provided, which includes a lubricant pump (16). To enable making the engine (10) smaller, it is proposed that the hydraulic pump (34) is connected to the lubricant system (14) in such a way that it can be lubricated by the lubricant.

Abstract: A control system and a control method for an internal combustion engine have a cylinder including an intake valve and an exhaust valve with a fully variable valve-gear assembly. An engine control unit determines setpoint values with regard to a fresh gas charge, an internal residual gas charge, a torque reduction, an EGR control strategy, and a charging strategy. In addition, a transmission device is provided which transmits setpoint values determined by the engine control unit to a valve control unit in synchronization with the crankshaft angle. The valve control unit controls the fully variable valve-gear assembly of the intake and exhaust valve of the cylinder of the internal combustion engine on the basis of the setpoint values determined by the engine control unit.

Abstract: A pressure reservoir is used to exert pressure on a hydraulic system. With the hydraulic system, a gas exchange valve, for instance, of an internal combustion engine can be actuated. The pressure reservoir (62) includes a housing (64, 68) and a piston (72) that is prestressed in operation by a device (88, 90). To enable making the pressure reservoir (62) as small as possible, it is proposed that the device (88, 90) which prestresses the piston (72) of the pressure reservoir (62) has a characteristic force-travel curve, in one range of motion of the piston (72), that has a slope which differs from the slope in a different range of motion of the piston (72).

Abstract: The method for cylinder-charge control consists in implementing an internal recirculation of residual gas in the cylinder, through controlling the closing times (AS) of at least one exhaust valve of the respective cylinder and by opening (EÖ1) at least one intake valve in the vicinity of top dead center (OT) of the piston, along with intermittent discharge of residual gas in front of the at least one intake valve, and that within one charge-exchange process in the cylinder, in at least two phases (EÖ1, ES1, EÖ2, ES2) that are offset in time from one another, at least one intake valve is opened. This method optimizes the engine operation in the warm-up phase from the standpoint of consumption, pollutant emission and running smoothness.

Abstract: The present invention relates to a connection (24) between a shaft end (20) of a gas exchange valve (1) of an internal combustion engine and a sleeve-shaped actuating element (2) of a valve actuator (4), which is guided in an axially movable manner within a pressure region (58), which is able to be pressurized with a pressure medium, of the valve actuator (4) and at least partially surrounds the shaft end (20).

Abstract: A timing gear for triggering a gas exchange valve for adjusting the output of an internal combustion engine through the opening and closing of the gas exchange valve and a method for triggering the gas exchange valve, where at least one of the opening and closing of the gas exchange valve is executed as a function of a delay interval when opening and/or closing the gas exchange valve and where in order to determine the delay time, the gas exchange valve is adjusted for the length of a predetermined adjustment interval and at least one of the opening and closing of the gas exchange valve is detected.

Abstract: An internal combustion engine having at least one combustion cylinder that includes a combustion chamber provided with gas-exchange valves, and an electrohydraulic valve control device having valve actuators that actuate the gas-exchange valves. To reduce manufacturing costs and/or the installation space required for the electrohydraulic valve control device, at least two synchronously controlled gas-exchange valves are connected using a coupling element to a common valve actuator, and the connection sites of the gas-exchange valves are flexibly formed on the coupling element.

Abstract: The present invention relates to a connection between two shaft ends (8, 10), situated coaxially one behind the other, of a gas exchange valve (1) of an internal combustion engine and a piston rod (2) of a valve actuator (4), where at least one coupling member (14) at least partially surrounds the shaft ends (8, 10).