Patent ID: 8500414

Claim:
A method of controlling a gear pump comprising two meshing gear wheels, wherein the two gear wheels are driven via respective shafts each by a drive unit, the method comprising determining a current position of the one gear wheel with respect to the current position of the other gear wheel and continuously adjusting the current position of the one gear wheel with respect to the current position of the other gear wheel according to specified predefined operating conditions, wherein the determination of the current position of the one gear wheel with respect to the current position of the other gear wheel is adjusted via a reference value, which is determined in a calibration before the normal operation of the gear pump or during interruptions of the normal operation of the gear pump, wherein the reference value lies in the middle between tooth flanks of a tooth space of a gear wheel, and wherein in the calibration the reference value is determined during rotation of the gear wheels in that, the one gear wheel is driven by the other gear wheel with a predetermined torque, a first angle difference is determined by calculating the difference between values measured with rotary encoders/sensor units, the other gear wheel is driven by the one gear wheel with a predetermined torque, a second angle difference is determined by calculating the difference between values measured with the rotary encoders/sensor units, a difference is determined between the first angle difference and the second angle difference, and the reference value is specified within the determined difference.