Patent ID: 7178490

Claim:
A device for electrohydraulic valve lift switching, comprising: an oil line to feed the supply side of an on/off valve, wherein the on/off valve is connected on an output side to a hydraulically activatable actuating element to cause valve lift switching, whereby an action of pressurized oil on the actuating element is configured to be controlled by the on/off valve, the on/off valve being and connected to a control device for activation; and an oil pressure metering device being arranged in the oil line, and connected to the control device to detect a short-term drop in oil pressure in the oil line and to report the short term drop in the oil pressure to the control device, wherein the control device is configured to identify that a valve lift switch has taken place, and to detect a switch time period between activation of the on/off valve by the control device and the short-term drop in oil pressure, and wherein the control device is configured to use differences between the determined switch time and a target value to adapt a timing of the valve lift switching.