Method for actuating a solenoid valve which is used for throughflow rate control of an agricultural spreading machine
AssigneeAmazonen-Werke H. Dreyer SE & Co. KG
InventorMarkus Trentmann
Life of this patent
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Abstract
A method for actuating a solenoid valve, which is used for throughflow rate control, of an agricultural spreading machine, wherein the solenoid valve has a valve armature, comprising: energizing the solenoid valve in order to cause an opening movement of the valve armature and/or in order to hold the valve armature in an open position in which the solenoid valve is open, interrupting or changing the energization of the solenoid valve in order to cause a closing movement of the valve armature in the direction of a valve seat, and causing a reduction in the movement speed of the valve armature during the closing movement of the valve armature.
Claims12
A method for actuating a solenoid valve of an agricultural spreading machine which is used for throughflow rate control, wherein the solenoid valve has a valve armature, comprising:
- energizing the solenoid valve in order to cause an opening movement of the valve armature or hold the valve armature in an open position in which the solenoid valve is open;
- and
- interrupting or changing the energization of the solenoid valve in order to cause a closing movement of the valve armature in the direction of a valve seat;
- and
- causing a reduction in the movement speed of the valve armature during the closing movement of the valve armature, wherein the solenoid valve has a coil and the energization of the solenoid valve for holding the valve armature in the open position is pulse-width modulated, wherein a negative induction voltage of the coil during pulse width modulated energization of the solenoid valve to hold the valve armature in the open position is limited to a first voltage limit value and during interruption or alteration of the energization of the solenoid valve to cause a closing movement of the valve armature is limited to a second voltage limit value, wherein the magnitude of the second voltage limit value is greater than the magnitude of the first voltage limit value.
A system for actuating a solenoid valve of an agricultural spreading machine used for throughflow rate control, the solenoid valve having a movable valve armature, comprising:
- a control unit via which the solenoid valve can be energized to cause an opening movement of the valve armature and/or to hold the valve armature in an open position in which the solenoid valve is open;
- wherein the control unit is adapted to cause the energization of the solenoid valve to be interrupted or changed to cause a closing movement of the valve armature in the direction of a valve seat;
- and
- wherein the control unit is configured to cause a reduction in the movement speed of the valve armature during the closing movement of the valve armature by a control intervention, in particular by causing the solenoid valve to be energized, wherein the solenoid valve has a coil and the control unit is adapted to energize the solenoid valve in a pulse width modulated manner to hold the valve armature in the open position and to limit a negative induction voltage of the coil during energizing of the solenoid valve in a pulse-width-modulated manner to hold the valve armature in the open position to a first voltage limit value and during interruption or alteration of the energization of the solenoid valve to cause a closing movement of the valve armature to a second voltage limit value, wherein a magnitude of the second voltage limit value is greater than a magnitude of the first voltage limit value.
Dependencies are inferred from the claim text.