Arrays for controllable power supply of electrovalves of an electrohydraulic valve control

A system for supplying current to a plurality of solenoid valves of an electrohydraulic valve-timing system of an internal combustion engine in a controllable manner, the plurality of solenoid valves being assigned to a gas-exchange actuator, a two-stage voltage supply being provided for the solenoid valves, the two-stage voltage supply including an inrush voltage from an inrush voltage source and a holding voltage from a holding-voltage source, the inrush voltage being greater than the holding voltage, the system comprising:

• an inrush voltage line and an a holding voltage line provided for each solenoid valve, the inrush voltage line connecting the respective solenoid valve to the inrush voltage source and the holding voltage line connecting the respective solenoid valve to the holding voltage source, wherein each solenoid valve is configured to be actuated independently of other solenoid valves for the duration of an inrush current time by an inrush current that corresponds to the inrush voltage, and for the duration of a holding current time by a holding current that corresponds to the holding voltage;
• a ground lead switch provided for each solenoid valve and configured to at least one of selectively connect and disconnect an electrical connection between the respective solenoid valve and ground;
• and
• a voltage switch, wherein a solenoid valve group is formed from at least two solenoid valves, and wherein the inrush voltage lines leading to the solenoid valves of the solenoid valve group have a common inrush-voltage circuit section, the voltage switch being provided in the common inrush-voltage circuit section for at least one of selectively connecting and disconnecting electrical connection between the inrush-voltage source and the solenoid valves of the solenoid valve group.

A system for supplying current to solenoid valves of an electrohydraulic valve-timing system of an internal combustion engine in a controllable manner, the solenoid valves being assigned to a gas-exchange actuator and being supplied with a holding voltage from a holding voltage source and an inrush voltage from an inrush voltage source, the system comprising:

• an inrush voltage line provided for each solenoid valve, the inrush voltage line connecting the solenoid valve to the inrush voltage source, wherein the solenoid valves are configured to be actuated independently of one another;
• a ground lead leading from each solenoid valve to ground, the ground lead having one ground lead switch for at least selectively connecting and disconnecting an electrical connection between the solenoid valve and ground;
• an inrush voltage line provided for each solenoid valve, the inrush voltage line connecting the respective solenoid valve to the inrush voltage source, wherein a solenoid valve group is formed from a plurality of solenoid valves, and wherein the inrush voltage lines leading to the solenoid valves of the solenoid valve group have a common inrush-voltage circuit section;
• and
• a voltage switch provided in the common inrush-voltage circuit section for at least one of selectively connecting and disconnecting an electrical connection between the inrush voltage source and the solenoid valves of the solenoid valve group by timed switching of the voltage switch using a selected make-to-break ratio, wherein an average voltage produced corresponds to the holding voltage, and wherein the solenoid valves of the solenoid valve group are selected such that there is no overlapping of inrush-voltage actuation times with holding-voltage actuation times.