Multi-split air conditioning system and control method therefor

A control method for a multi-split system,

• wherein the multi-split system comprises an outdoor unit, at least one indoor unit, and a heat-storage module,
• wherein the outdoor unit comprises a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger, and an outdoor throttle;
• wherein each indoor unit comprises an indoor heat exchanger and an indoor throttle;
• wherein the heat-storage module comprises a heat accumulator and a heat-storage throttle,
• wherein the first four-way valve is provided with
• a first port connected to an exhaust port of the compressor,
• a second port connected to an end of each indoor heat exchanger, and
• a third port connected to an air-return port of the compressor;
• wherein the second four-way valve is provided with
• a first port connected to the exhaust port of the compressor,
• a second port connected to an end of the outdoor heat exchanger, with another end of the outdoor heat exchanger connected to an end of each indoor throttle via the outdoor throttle;
• and another end of each indoor throttle connected to another end of each indoor heat exchanger,
• a third port connected to the air-return port of the compressor, and
• a fourth port connected to an end of the heat accumulator, with another end of the heat accumulator connected to the end of each indoor throttle via the heat-storage throttle,
• wherein the control method comprises:
• acquiring an operation mode of the multi-split system, in response to determining that a shut-down instruction is received or an indoor temperature reaches to a set temperature;
• and
• controlling the first four-way valve, the second four-way valve, the outdoor throttle, the indoor throttle and the heat-storage throttle in accordance with the operation mode.