Heat exchange system, air conditioning apparatus and control method for air conditioning apparatus

An air conditioning apparatus, comprising:

• a heat exchange system comprising:
• a compressor, comprising an exhaust port and a suction port;
• a four-way valve, wherein a first end port of the four-way valve is communicated with the suction port, and a second end port of the four-way valve is communicated with the exhaust port;
• an outdoor heat exchanger, wherein one end of the outdoor heat exchanger is communicated with a third end port of the four-way valve;
• a throttle device, wherein one end of the throttle device is communicated with another end of the outdoor heat exchanger;
• an indoor heat exchanger, wherein one end of the indoor heat exchanger is communicated with another end of the throttle device, and another end of the indoor heat exchanger is communicated with a fourth end port of the four-way valve;
• a fluid reservoir, comprising a first communication port and a second communication port, wherein the first communication port is communicated with the suction port, and the second communication port is communicated with one end of the indoor heat exchanger;
• a first valve body, being arranged on a flow path between the fluid reservoir and the compressor;
• a second valve body, being arranged on a flow path between the second communication port of the fluid reservoir and the throttle device;
• and
• a detection device arranged at the indoor heat exchanger and communicating with refrigerant in the indoor heat exchanger, and configured to detect an amount of refrigerant for heat exchange cycle in the heat exchange system,
• wherein when the heat exchange system operates in a heating condition, working states of the first valve body and the second valve body are controlled according to the amount of refrigerant in the heat exchange system.