Air conditioning system for two-stage enthalpy-added vehicle and control method

Abstract

The invention provides an air conditioning system for a two-stage enthalpy-added vehicle and a control method. The air conditioning system for the two-stage enthalpy-added vehicle includes a compressor (1), an indoor heat exchanger (6), an outdoor heat exchanger (2) and a main throttling device (3), wherein the compressor (1) includes a medium pressure air supplementing port (12) and is a variablecapacity compressor; a pipe between the indoor heat exchanger (6) and the main throttling device (3) is further provided with an air-supplementing and enthalpy-increasing component, and medium pressure refrigerant gas generated by the air-supplementing and enthalpy-increasing component is communicated with the medium pressure air supplementing port (12). High heating capacity can be provided forthe vehicle air conditioning system in a volume ratio variable air-supplementing and enthalpy-increasing mode, the shortcoming of low heating capacity in automobiles, and particularly in electric automobiles are overcome, the energy efficiency can be effectively improved, the power consumption can be reduced, the heating capacity and energy efficiency under the low temperature operating conditionscan be ensured, and the energy efficiency under normal operating conditions is ensured.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a two-stage enthalpy increasing vehicle air conditioning system and a control method. Background technique [0002] At present, since pure electric buses do not have waste heat from fuel engines as a heating source, heat pump or heat pump + PTC technical solutions are mostly used in the industry. There are three problems in adopting the heat pump system scheme in severe winter: [0003] 1. The heating capacity of the single-stage heat pump system is insufficient, especially at low ambient temperatures below 0°C; [0004] 2. The heat pump + PTC solution meets the heating capacity requirements, but the heating energy efficiency is low and the power consumption is high. Seriously affect the cruising range of electric vehicles; [0005] 3. The volume ratio of the high and low pressure stages of ordinary two-stage enthalpy-increasing compressors cannot be chang...

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Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defects of insufficient heating capacity of electric vehicles in the prior art, especially at low ambient temperatures below 0°C, low heating energy efficiency, and high power consumption, thereby A two-stage enthalpy-increasing vehicle air-conditioning system and control method are provided

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