Method for operating an electrohydraulic valve control system of an internal combustion engine, computer program, and control, and regulating unit for operating an internal combustion engine

The method according to one of the preceding claims, characterized in that the working chamber (30) of an actuator (24), which is to be moved from the first position into the second position, is connected to the high-pressure hydraulic accumulator (16) just before being shut off from the low-pressure return (56), and/or the working chamber (30) of an actuator (24), which is to be moved from the second position into the first position, is connected to the low-pressure return (56) just before being shut off from the high-pressure hydraulic accumulator (16).

The method according to one of the preceding claims, characterized in that the working chamber (30) of an actuator (24) is temporarily connected to the high-pressure hydraulic accumulator (16) and the low-pressure return (56) simultaneously when the internal combustion engine is operated at a low speed.

The method according to one of the preceding claims, characterized in that there is also a control or regulation of the delivery quantity by means of the hydraulic pump (14).

The method according to one of the preceding claims, characterized in that the actuator (24) has two working chambers (30, 32) that are separated from each other by pressure surfaces (34, 36) on a piston (26), which are of different sizes and work in opposition to each other, and the one working chamber (32) is continuously acted on by high pressure while the other working chamber (30) can be connected to the high-pressure hydraulic accumulator (16) and the low-pressure return (56).

The method according to one of the preceding claims, characterized in that the hydraulic fluid flows out of the working chamber (30) into a low-pressure hydraulic accumulator (52).

A computer program, characterized in that it is suitable for executing the method according to one of the preceding claims when it is run on a computer.

The computer program according to claim 11, characterized in that it is stored in a memory, in particular a flash memory or a ferrite RAM.

The control and regulating unit (78) according to claim 12, characterized in that it is provided with a computer program according to one of claims 9 or 10.