METHOD AND APPARATUS FOR DETERMINING A MOVEMENT OF AN INJECTION VALVE NEEDLE

摘要

The invention relates to a method for determining a point in time when a valve needle arranged in an injection valve changes directions. In said method, a variable providing information on a curve indicating the pressure (40) in a control chamber of the injection valve is directly measured using a sensor in the control chamber, and from said variable providing information on the pressure curve (40), it is determined at what point in time the curve is at an extreme point, and said point in time is identified as the point in time when the direction changes.