Cooling system control

A cooling system (30) comprising a compressor (32), a condenser (34) and an evaporator (36) wherein a refrigerant is circulated, the cooling system further comprising a valve (38) interconnected in the flow of the refrigerant from the condenser to the evaporator, the valve being configured to enter a first, open, state when the compressor is in an on-phase and to enter a second, closed, state when the compressor is in an off state by a controller (42), wherein the controller is adapted to control the valve to operate in accordance with at least one of:

• opening the valve a first variable time period before the compressor is switched to an on-phase;
• where the first variable time period is set in response to an external parameter obtained by the controller, and/or
• closing the valve a second variable time period before the compressor is switched to an off-phase, where the second variable time period is set in response to an external parameter obtained by the controller,
• where the controller is adapted to, when the compressor is in an off state, move a piston of the compressor backwards against the normal direction of operation of the piston.

A cooling system (30) comprising a compressor (32), a condenser (34) and an evaporator (36) wherein a refrigerant is circulated, the cooling system further comprising a valve (38) interconnected in the flow of the refrigerant from the condenser to the evaporator, the valve being configured to enter a first, open, state when the compressor is in an on-phase and to enter a second, closed, state when the compressor is in an off state by a controller (42), wherein the controller is adapted to control the valve to operate in accordance with at least one of:

• opening the valve a first variable time period before the compressor is switched to an on-phase;
• where the first variable time period is set in response to an external parameter obtained by the controller, and/or
• closing the valve a second variable time period before the compressor is switched to an off-phase, where the second variable time period is set in response to an external parameter obtained by the controller,
• where the controller is adapted to, when the compressor is in an off state, move a piston of the compressor backwards against the normal direction of operation of the piston, and
• wherein the controller is adapted to move the piston with a pre-determined force and/or during a predetermined time.