A high-efficiency defrosting heat pump type pure electric passenger car air conditioner

Abstract

The invention discloses a heat pump type pure electric bus air conditioner with an efficient defrosting function. The air conditioner comprises a compressor, two evaporator assemblies, a condenser assembly, a pipeline assembly and a controller assembly. A PTC electric heater is arranged between an evaporation core and evaporation fans of an evaporator. An exhaust gas temperature sensor is arrangedat an outlet of the compressor. Defrosting temperature sensors are arranged on a condensing core. Outdoor temperature sensors are arranged at an air inlet of a condenser. An evaporation temperature sensor is arranged on each evaporation core. A return air temperature sensor is arranged at a return air port of each evaporator assembly. All the sensors are connected with the controller assembly through pipelines. According to the pure electric bus air conditioner, the defrosting mode starting time and the defrosting mode stop time of the air conditioner, and the rotating speed of the compressor, the opening degrees of electronic expansion valves and the starting level of PTC electric heating in the defrosting process are intelligently calculated by monitoring the bus outside environment temperature, the temperature of the condensing core, and the exhaust gas temperature of the compressor, the defrosting efficiency is improved, and the power consumption of the product is reduced.

Description

technical field [0001] The invention relates to the technical field of electric passenger car air conditioners, in particular to a high-efficiency defrosting heat pump type pure electric passenger car air conditioner. Background technique [0002] Since there is no waste heat from the fuel engine of traditional vehicles to use, the existing pure electric bus air conditioners can only rely on air conditioning units or PTC heaters for heating in winter. Using PTC heaters for heating can effectively compensate for the poor heating performance of the air conditioning heat pump system at low temperature, but The efficiency is too low, which seriously affects the cruising range of the vehicle. The efficiency of the heat pump air conditioning system is high, but the condenser is prone to frost during the heating operation of the unit. After the condenser is frosted, the performance of the unit is significantly attenuated. In order to reduce the risk of frosting on the system, some ...

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Problems solved by technology

[0002] Since there is no waste heat from the fuel engine of traditional vehicles to use, the existing pure electric bus air conditioners can only rely on air conditioning units or PTC heaters for heating in winter. Using PTC heaters for heating can effectively compensate for the poor heating performance of the air conditioning heat pump system at low temperature, but The efficiency is too low, seriously affecting the cruising range of the vehicle

The efficiency of the heat pump air conditioning system is high, but the condenser is prone to frost during the heating operation of the unit. After the condenser is frosted, the performance of the unit is significantly attenuated. In order to reduce the risk of frosting on the system, some passenger car air conditioners When the temperature is low, the use of heat pumps is limited, and only electric heating is used for heating; although some manufacturers use heat pump systems for heating, they do not consider the impact of air conditioner operating conditions on system defrosting, resulting in incomplete defrosting or low defrosting efficiency ; In addition, because the thermal expansion valve is used as the throttling mechanism, the flow adjustment accuracy is poor, resulting in low refrigerant flow during the defrosting process, which in turn affects the defrosting efficiency

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