Patent ID: 8333566

Claim:
A fluid pump controlling system comprising, a fluid pump ( 10 ) comprising a piston displaceably positioned in a cylinder, the cylinder having a piston displacement stroke and the cylinder having a stroke end, the fluid pump ( 10 ) being driven by an electric motor fed by electric voltage; a sensing assembly ( 11 ) to measure the behavior of the piston, and an electronic controller ( 16 ) to control the electric voltage, the electronic controller ( 16 ) being electrically connected to the sensing assembly ( 11 ), the electronic controller ( 16 ) being arranged to monitor the displacement of the piston within the cylinder during operation by detecting an impact signal, the impact signal being transmitted by the sensing assembly ( 11 ) upon occurrence of an impact of the piston with the stroke end, the impact signal being transmitted by the sensing assembly ( 11 ) to the electronic controller ( 16 ), the electronic controller ( 16 ) being configured to cause a calibration impact by performing a calibration procedure comprising successively incrementing the piston displacement stroke by increasing the voltage fed to the electric motor, the voltage increment being controlled by a trigger signal until the occurrence of the calibration impact, and storing a maximum value of piston displacement corresponding to the piston displacement as far as the stroke end, wherein the calibration procedure is performed prior to operation and in response to receiving an impact signal during operation.