A method for controlling a compression refrigeration system comprising: - a refrigerant circuit comprising - a refrigerant, - an evaporator, - a compressor, - a condenser, - a throttle valve, - an internal heat exchanger for transferring thermal energy of the refrigerant before entering the throttle valve to the refrigerant before entering the compressor, and - a control unit a) for detecting overheating (T ÜE) of the refrigerant at the entry to the compressor, the overheating (T ÜE) being defined as a difference between a dew point temperature and a temperature of the refrigerant, and b) for controlling the throttle valve based on the overheating (T ÜE), wherein the method includes the following steps: - determining a first target overheating of the refrigerant at the entry to the compressor, wherein the first target overheating maximises the efficiency of the compression refrigeration system as a function of an operating point of the compression refrigeration system, - determining a second target overheating of the refrigerant at the entry to the compressor based on a maximum allowable hot gas temperature at the outlet of the compressor, and - control of the throttle valve based on the lower value from the first target overheating and the second target overheating. - a refrigerant circuit comprising - a refrigerant, - an evaporator, - a compressor, - a condenser, - a throttle valve, - an internal heat exchanger for transferring thermal energy of the refrigerant before entering the throttle valve to the refrigerant before entering the compressor, and - a control unit a) for detecting overheating (T ÜE) of the refrigerant at the entry to the compressor, the overheating (T ÜE) being defined as a difference between a dew point temperature and a temperature of the refrigerant, and b) for controlling the throttle valve based on the overheating (T ÜE), - a refrigerant, - an evaporator, - a compressor, - a condenser, - a throttle valve, - an internal heat exchanger for transferring thermal energy of the refrigerant before entering the throttle valve to the refrigerant before entering the compressor, and - a control unit a) for detecting overheating (T ÜE) of the refrigerant at the entry to the compressor, the overheating (T ÜE) being defined as a difference between a dew point temperature and a temperature of the refrigerant, and b) for controlling the throttle valve based on the overheating (T ÜE), a) for detecting overheating (T ÜE) of the refrigerant at the entry to the compressor, the overheating (T ÜE) being defined as a difference between a dew point temperature and a temperature of the refrigerant, and b) for controlling the throttle valve based on the overheating (T ÜE), - determining a first target overheating of the refrigerant at the entry to the compressor, wherein the first target overheating maximises the efficiency of the compression refrigeration system as a function of an operating point of the compression refrigeration system, - determining a second target overheating of the refrigerant at the entry to the compressor based on a maximum allowable hot gas temperature at the outlet of the compressor, and - control of the throttle valve based on the lower value from the first target overheating and the second target overheating.