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  • Solenoid valve for controlling an electrically controlled fuel ignition valve

    Date: 2011-12-8 8:51:45
    Solenoid valve for controlling an electrically controlled fuel injection valve. A solenoid valve of this kind has been disclosed in EP 0 690 223 A2. It is used there to control an electrically controlled fuel injection valve. The valve needle of the fuel injection valve is loaded in the closing direction by a pressure prevailing in a control chamber. The solenoid valve operates in a known manner so that in order to initiate the injection, it initiates a discharge of the control chamber when the magnet of the solenoid valve is excited and the valve needle of the injection valve is consequently lifted up from its seat through the influence of the high pressure acting on it on the other side. In the solenoid valve, the armature is connected to an armature bolt which the valve member of the solenoid valve in turn rests against.

    Furthermore, the proposal has already been made to reduce the moving mass of the unit comprising the armature and valve member in such a way that a part of the armature is embodied so that it can move in relation to another part of the armature. However, this results in a disadvantage by virtue of the fact that the part of the armature that can move in relation to the other part postoscillates after the valve member comes to rest against its seat. Through an oscillation of this kind, the armature assumes an indefinite position after a preinjection, which can result in the fact that during the subsequent main injection, different opening times of the solenoid valve can occur with the same triggering, which leads to a variance in injection quantities.

    The disadvantage of the known solenoid valve is comprised in that an oscillation of the armature and/or rebounding of the valve member can occur during its operation, which is particularly disadvantageous if a rapid switching sequence of the solenoid valve is required and the intent is to carry out an injection that is controlled by the solenoid valve and is divided into a preinjection and a main injection.

    The solenoid valve has the advantage that a rebound of the valve member against its seat and a postoscillation of the first armature part are prevented so that after the solenoid valve closes, this valve member assumes its closed position and after a desired first deflection movement, the armature part assumes its rest position again rapidly before the main injection begins. It is also advantageous that a damping of a deflection movement of the armature part produced in this manner can be achieved without additional parts in that a damping pocket is produced in the region of the armature part.

solenoid valve
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