Refrigeration system having a heat pump function for a motor vehicle, having a single sensor device on the low-pressure side

A refrigeration system having heat pump function for a motor vehicle, comprising:

• a refrigerant compressor, which is connectable or connected to a primary line;
• a directly or indirectly acting external heat exchanger, which is arranged in the primary line;
• a first evaporator, which is arranged in the primary line;
• a first directly or indirectly acting heat exchanger, comprising a chiller, which is arranged fluidically parallel to the first evaporator;
• a refrigerant collector arranged on the low-pressure side, and
• a control device,
• wherein a single sensor device is arranged downstream of the first evaporator and the first directly or indirectly acting heat exchanger comprising the chiller, wherein the single sensor device is configured to detect the pressure and the temperature of the refrigerant on the low-pressure side of the refrigeration system, and
• wherein the control device is configured to obtain one or more detected pressure and/or temperature values from the single sensor device and is configured to perform one of:
• monitoring temporary, in particular short-term or long-term, overheating of the refrigerant for recognizing underfilling;
• and
• monitoring the minimum suction pressure for anti-icing protection.