Abstract: A cylinder head (10) for a combustion cylinder of an internal combustion engine is described, which has at least one inlet opening and at least one outlet opening, as well as gas exchange valves (11) which are operable by electrohydraulic valve actuators (15) which as inlet valves (111) control the at least one inlet opening and as outlet valves (112) control the at least one outlet opening. For the purpose of premanufacturing a compact, complete module which, as a separate component, may be tested for reliability and may be installed into the engine block of the internal combustion engine without additional preassembly effort, there is present at cylinder head (10) at least one high pressure rail (37) for supplying fluid under high pressure, and at least one recycling rail for recycling fluid, which have coupling openings (39, 40) for the hydraulic coupling of the valve actuators (15), and also means for fastening the valve actuators (15) are provided (FIG. 1).

Abstract: In a method and a circuit system for operating a solenoid valve, particularly for actuating an electrohydraulic gas-exchange valve control, an injection valve, or an intake or exhaust valve of an internal combustion engine, to permit the simplest possible driving of the solenoid valve, the solenoid valve is acted upon in a controlled manner in a cycle including three phases, in which in a pull-up phase, the solenoid valve is connected for a predefined time duration to a first voltage of predetermined magnitude for generating a pull-up current, in a holding phase is connected to a second voltage of predetermined magnitude for generating a holding current, and in a de-energize phase is separated from both voltages.

Abstract: A connection between two shaft ends situated coaxially one behind the other, of a gas exchange valve of an internal combustion engine and a piston rod of a valve actuator is provided, where at least one coupling member at least partially surrounds the shaft ends. The coupling member is radially compressed with respect to the two shaft ends by at least one compressing member to produce static friction locking between each shaft end and the coupling member that transfers the actuating motion of valve actuator to gas exchange valve in a slip-free manner. As a result, the fatigue strength of the connection may be increased and its assembly and disassembly may be simplified.

Abstract: A device for controlling an opening cross section in the combustion cylinder of an internal combustion engine is provided, the device having a gas exchange valve integrated into the combustion cylinder and having an actuator which drives the valve element to execute a closing stroke and an opening stroke. A valve brake which is active during a residual closing stroke of the valve element is provided for the purpose of reducing the impact velocity of the valve closure member of the valve element on the valve seat in the closing stroke of the valve element. The valve brake has a hydraulic damping element with a fluid displacement volume which flows out through a throttle cross section of a throttle opening, and a control unit for controlling the throttle cross section as a function of the viscosity of the displacement volume.

Abstract: A connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleevelike actuating piston of a valve actuator, has at least two shell-like key pieces, surrounding the shaft end and on whose radially outer circumferential surface there is a conically tapering portion, pointing away from a combustion chamber of the engine, and extending in complementary fashion to the cone angle of a radially inner conical portion of a conical fastening sleeve that includes the key pieces, and the conical fastening sleeve and the key pieces can be braced axially against one another. Protrusions and recesses engaging one another are provided on the radially inner circumferential surface of the key pieces and on the radially outer circumferential surface of the shaft end of the gas exchange valve. The conical fastening sleeve is formed by the actuating piston and the actuating piston and the key pieces have threaded portions that can be screwed into one another.

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: The invention relates to a connection (42) between a shaft end (22) of a gas exchange valve (1) of an internal combustion engine and a sleevelike actuating piston (2) of a valve actuator (4), having at least two shell-like key pieces (44, 46), surrounding the shaft end (22) and on whose radially outer circumferential surface there is a conically tapering portion (50), pointing away from a combustion chamber of the engine, which portion extends in complementary fashion to the cone angle of a radially inner conical portion (60) of a conical fastening sleeve that includes the key pieces (44, 46), and the conical fastening sleeve and the key pieces (44, 46) can be braced axially against one another, and protrusions (70) and recesses (72) engaging one another are provided on the radially inner circumferential surface of the key pieces (44, 46) and on the radially outer circumferential surface of the shaft end (22) of the gas exchange valve (1).