Method for controlling a compressor of a refrigeration system comprising a motor, and a compressor of a refrigeration system

A compressor of a refrigeration system, with

• a motor compressing a refrigerant flow,
• at least one valve influencing the volume of the refrigerant flow through the compressor,
• a control device controlling the valve, whereby the valve can be controlled in a cycle of consecutive time intervals (I) of an identical length, either in the sense of opening or in the sense of closing, so that the valve is either completely closed or completely open during a time interval (I),
• at least one sensor unit detecting a percentage capacity (S) of the compressor corresponding to the current refrigeration requirement of a refrigeration location,
• an evaluation unit detecting a percentage open time (F) of the valve over a number of time intervals (I) including the current time interval (In) and further preceding time intervals (In−1, In−2, In−3, In−4), whereby
• the control device is connected with the evaluation unit and is designed in such a way that the valve is opened for the following time interval (In+1) when the ratio of the percentage capacity (S) of the compressor (1) corresponding to the refrigeration requirement is greater than the open time percentage (F) of the valve determined in the past, and the valve is closed for the following time interval (In+1) when the ratio of the percentage capacity (S) of the compressor corresponding to the refrigeration requirement is smaller than the open time percentage (F) of the valve determined in the past.