Automobile electronic expansion valve control method and device and heat pump system

Abstract

The invention provides an automobile electronic expansion valve control method and device and a heat pump system. The automobile electronic expansion valve control method comprises the following stepsthat the battery core body temperature T, the target evaporator temperature T0, the rapid cooling threshold value T1, the battery water inlet temperature T2, the target superheat degree DZ of an evaporator and the target superheat degree DL of a cooler are obtained; the cooling grade of the battery is judged according to the battery core body temperature T and the rapid cooling threshold value T1; and the opening degree of a first electronic expansion valve at the evaporator and a second electronic expansion valve at the cooler is adjusted according to the battery cooling grade, and the rotating speed of the compressor is adjusted according to the battery cooling grade, the target evaporator temperature T0 and the battery water inlet temperature T2 so as to change the refrigerant flow. Bymeans of the control method, the refrigerant flow on the two sides of the evaporator and the cooler of the new energy automobile can be dynamically adjusted according to the air conditioner heat loadand the battery refrigeration requirement, on the premise that the service life of the battery is guaranteed, the comfort of the whole automobile is guaranteed to the maximum extent, and energy is saved.

Description

technical field [0001] The invention relates to the field of automobile air-conditioning controllers, in particular to a method and device for controlling an automobile electronic expansion valve and a heat pump system. Background technique [0002] At present, the air-conditioning system of traditional fuel vehicles generally uses a thermal expansion valve. Its working principle is to adjust the refrigerant flow rate by sensing the superheat of the refrigerant vapor at the outlet of the evaporator. Although the thermal expansion valve can automatically adjust the refrigerant flow rate, but in the new In energy vehicles, there are more obvious defects. Because the current heat dissipation of the power battery is relatively large, the air conditioning system not only needs to cool the passenger compartment, but also needs to cool the power battery at the same time. When the cooling demand of the power battery suddenly increases, if the thermal expansion valve is still used, t...

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Problems solved by technology

[0002] At present, the air-conditioning system of traditional fuel vehicles generally uses a thermal expansion valve. Its working principle is to adjust the refrigerant flow rate by sensing the superheat of the refrigerant vapor at the outlet of the evaporator. Although the thermal expansion valve can automatically adjust the refrigerant flow rate, but in the new In energy vehicles, there are obvious defects

Because the current heat dissipation of the power battery is relatively large, the air conditioning system not only needs to cool the passenger compartment, but also needs to cool the power battery at the same time. When the cooling demand of the power battery suddenly increases, if the thermal expansion valve is still used, the battery cooling will be turned on. , it has a greater impact on the cooling of the passenger compartment

[0003] The battery of existing new energy vehicles is usually cooled by the air conditioner compressor, but the evaporator & Chiller (cooler) are both equipped with a thermal expansion valve + solenoid valve. When the battery needs to be cooled, the Chiller (cooler) side The sudden opening of the solenoid valve causes a sudden change in the temperature of the air outlet of the air conditioner and poor comfort; in order to weaken the impact of the rapid cooling of the battery on the air conditioner, the rapid cooling is usually only turned on when the temperature of the battery core is high, which has a certain impact on the battery life; When the cooling demand of the air conditioner is small and the cooling demand of the battery is large, since the opening of the thermal expansion valve cannot be adjusted, the temperature of the evaporator of the air conditioner will be much lower than the required temperature, wasting energy

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