Indirect heat pump air conditioning system, control method and pure electric vehicle

Abstract

The invention relates to an indirect heat pump air conditioning system, a control method and a pure electric vehicle. When refrigeration and heating of a passenger compartment are started, a vehicle-mounted air conditioner refrigerant exchanges heat indirectly with a cooling liquid loop; therefore, the refrigerant is not directly guided into the passenger compartment, so that the safety risk caused by combustion and explosion of the refrigerant is greatly reduced. The system includes: a first refrigerant circulation loop; a second refrigerant circulation circuit; a first cooling liquid circulation loop; and a second cooling liquid circulation loop; the first cooling liquid circulation loop and the second cooling liquid circulation loop are communicated through a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve; a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve are controlled so that the cooling liquid in the second cooling liquid circulation loop flows into the first cooling liquid circulation loop and then flows back to the second cooling liquid circulation loop, or, the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop flow independently.

Description

technical field [0001] The invention relates to a heat pump air conditioning system for an electric vehicle, in particular to an indirect heat pump air conditioning system, a control method and a pure electric vehicle for heating and cooling a passenger compartment of a vehicle with a multiplexed heat exchange core for indirect heat exchange. Background technique [0002] Due to the advantages of high efficiency and energy saving of heat pump systems, major automobile manufacturers have started the development of heat pump systems. However, due to the limitation of physical properties of traditional R134a refrigerant, the system efficiency is low in the environment below -10 °C, and it cannot meet the heating needs of the passenger compartment. , major OEMs seek new heat pump air conditioning refrigerants, such as R410A, CO2, etc., but the alternatives all have the shortcomings of high flammability or high system pressure. The traditional car air conditioner evaporator is dir...

AI Technical Summary

Problems solved by technology

[0002] Due to the advantages of high efficiency and energy saving of heat pump systems, major automobile manufacturers have started to develop heat pump systems. However, due to the limitation of physical characteristics of traditional R134a refrigerant, the system efficiency is low in the environment below -10°C, which cannot meet the heating needs of the passenger compartment. , the major OEMs are looking for new heat pump air-conditioning refrigerants, such as: R410A, CO2, etc., but the substitutes have the disadvantages of high flammability or high system pressure. The traditional automotive air-conditioning evaporator is directly placed in the passenger compartment. Introducing refrigerant into the passenger compartment poses a high safety risk

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