Fluid pump controlling system, a fluid pump controlling method, a linear compressor and a cooler

A fluid pump (10) 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 power,
• a piston-position sensing assembly (11), and
• an electronic controller (16) electrically connected to the sensing assembly (11), the electronic controller (16) monitoring the piston displacement 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 from a trigger signal until the occurrence of the calibration impact to store a maximum value of piston displacement, and monitoring the piston displacement within the cylinder and preventing displacement as far as the maximum value of piston displacement, wherein the calibration procedure is performed prior to operation and in response to receiving an impact signal during operation.

A fluid pump controlling method, the 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, wherein the method comprises the steps of:
• subjecting the piston stroke in the cylinder to a calibration procedure until a calibration impact is detected, wherein the calibration procedure comprises successively incrementing the piston stroke to cause the calibration impact with the stroke end, the calibration procedure further comprising:
• (a) monitoring the piston stroke for a stabilization time,
• (I) incrementing the piston stroke if no impact occurs during the stabilization time and repeating the step (a), or
• (II) decrementing the piston stroke if an impact occurs during the stabilization time;
• and
• (b) storing a value of the piston stroke determined in step (II)
• controlling the piston displacement during operation by applying a maximum piston stroke length equal to the stored value.

A fluid pump controlling method, the 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,
• wherein the method comprises the steps of:
• (a) turning on the fluid pump (10), causing the piston to displace in the cylinder;
• (b) successively incrementing the piston stroke during a calibration procedure to cause an impact with the stroke end to determine and store a maximum value of piston displacement,
• (c) monitoring the piston stroke for a stabilization time between the successive increments of the stroke,
• (d) decrementing the piston stroke if an impact occurs during the stabilization time, and
• (e) controlling the piston displacement during operation by applying a maximum piston stroke length equal to the stored maximum value.