A heat pump air conditioner unit, its control method and electric passenger car

Abstract

The invention provides a heat pump air-conditioning unit, a control method thereof and an electric passenger car. The heat pump air-conditioning unit comprises at least two independent air-conditioning circulating systems, and each of the independent air-conditioning circulating systems comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttling element. When the outdoor heat exchanger in one of the air-conditioning circulating systems requires defrosting, at least one coolant capable of heating the indoor heat exchanger in the other air-conditioning circulating systems operates circularly. The heat pump air-conditioning unit has the advantages that when one of the air-conditioning circulating systems defrosts, at least one of the other air-conditioning circulating systems can be used for continuing heating indoors, so that effect of indoor temperature decrease and great indoor temperature fluctuation during defrosting on users' comfort can be effectively prevented; an indoor environment can be cooled and heated sectionally, and even if one section of air-conditioning system fails, at least the other section of air-conditioning system can operate normally, so that sectional sequential defrosting can be achieved and system reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a heat pump air conditioning unit, a control method thereof and an electric passenger car. Background technique [0002] Compared with traditional internal combustion engines and hybrid electric buses in the prior art, since there is no waste heat from the engine to use, the air conditioning system of the passenger car generally adopts a single-cooling air conditioning system + PTC system heating scheme, and PTC electric heating is used in winter Heating, but the efficiency of PTC electric heating is very low (the highest will not exceed 1), so when the air conditioner is in heating mode in winter, it needs to consume more power to heat, which will greatly shorten the cruising range of pure electric buses. [0003] The use of heat pump air-conditioning systems on pure electric buses can effectively improve the efficiency in heating mode, thereby increasing th...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the indoor temperature will drop during defrosting in the heat pump air-conditioning system in the prior art, thereby providing a heat pump air-conditioning unit, its control method and electric passenger car

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