Method and controller for controlling a switch valve

1. A method for controlling a pressure dissipation valve for a fuel injection system, wherein the pressure dissipation valve comprises a closure element movable between a first end position blocking a valve opening and a second end position at least partially opening the valve opening, a spring applying a spring force urging the closure element toward the first end position, and an electromagnetic actuator responding to an applied voltage to apply an actuator force to the closure element acting oppositely to the spring force, the method comprising:

applying a constant voltage to the actuator to induce an opening current pulse until the closure element begins motion counter to the spring force;

immediately ending the application of the constant voltage upon the beginning of motion of the closure element;

thereafter, applying a pulsed voltage to the actuator to induce a substantially constant holding-open current intensity;

maintaining the pulsed voltage for a predetermined duration to hold the closure element in the second end position; and

interrupting the application of voltage after the predetermined duration, wherein the closure element moves into the first end position as a result of the spring force.

2. The method as claimed in claim 1 , wherein the actuator force acting on the closure element owing to the induced current intensity of the opening current pulse is greater in terms of magnitude than the spring force of the spring.

3. The method as claimed in claim 1 , wherein the application of voltage is interrupted until an induced current intensity of 0 is attained.

4. The method as claimed in claim 1 , further comprising, during the movement of the closure element into the first end position after the interruption of the application of voltage, applying a constant voltage to the actuator to induce a braking current intensity; and

wherein a duration of the application of voltage for inducing the braking current intensity is shorter than the duration of the application of voltage for inducing the opening current pulse.

5. The method as claimed in claim 4 , wherein the actuator force acting on the closure element as a result of the induced braking current intensity is lower than the spring force of the spring.

6. The method as claimed in claim 4 , further comprising:

ending the application of the constant voltage;

then immediately applying a pulsed voltage to the actuator until such time as the closure element is situated in the first end position; and

then ending the application of voltage.

7. A control device for a pressure dissipation valve in a fuel injection system, the control device comprising:

a processor; and

a memory storing a set of instructions executable by the processor, the set of instruction, when loaded and executed by the processor, programming the processor to:

apply a constant voltage to an actuator to induce an opening current pulse until a closure element of the pressure dissipation valve begins motion counter to a spring force urging the closure element toward a closed position;

immediately end the application of the constant voltage upon the beginning of motion the closure element;

thereafter, apply a pulsed voltage to the actuator to induce a substantially constant holding-open current intensity;

maintain the pulsed voltage for a predetermined duration to hold the closure element in the second end position; and

interrupt the application of voltage after the predetermined duration, wherein the closure element moves into the first end position as a result of the spring force.

8. The method as claimed in claim 1 , wherein the actuator force acting on the closure element owing to the induced holding-open current intensity substantially corresponds in terms of magnitude to the spring force.