Method and device for controlling a quantity control valve

摘要

In a fuel injection system of an internal combustion engine, fuel is delivered from a high-pressure pump into a fuel rail. The quantity of the delivered fuel is influenced by a quantity control valve which is activated by an electromagnetic actuating device. The level of control of the quantity control valve during the transition from the closed state to the open state of the quantity control valve is provided in the form of a sufficiently flat, descending progression which allows a robust control of the opening motion with regard to the varying specimen properties.

主权项

1. A method for controlling a quantity control valve configured to move to a closed state when controlled by a first control value of a control signal and move to an open state when controlled by a second control value of the control signal, the method comprising:
continuously decreasing the control signal from a first signal value at a first point in time to a second signal value at a second point in time; and subsequently continuously decreasing the control signal from the second signal value at the second point in time to the second control value at a third point in time; wherein the quantity control valve is:
in the closed state, not allowing fluid to enter a delivery space, at the first point in time;starts to open, beginning to allow fluid to enter the delivery space, at the second point in time;completely open in an open state, allowing fluid to enter the delivery space, before the third point in time;in the closed state for control signal values above the first signal value; andnot in the closed state for control signal values below the second signal value, as a result of at least one of (i) a predefined first time interval between the second point in time and the first point in time, and (ii) a predefined second time interval between the second point in time and the third point in time.