A car air conditioning system

Abstract

An automobile air condition system adopts the following four modes: a refrigeration mode, a heating mode, a demisting mode, and a deicing mode, and comprises a heating parts temperature control circuit and a heat pump system, wherein a refrigerant circulation circuit is in heat exchange with the heating parts temperature control circuit through a double-fluid passage heat exchanger; a first fluid passage of the double-fluid passage heat exchanger is communicated with the refrigerant circulation circuit, and a second fluid passage thereof is communicated with the heating parts temperature control circuit; the heating parts temperature control circuit can be selectively conducted to cool heating parts; the refrigerant from a compressor passes towards a heater and then is split into two ways, wherein the first-way refrigerant passes through the heat exchanger outside a car and then through a first throttle valve to throttle, and the second-way refrigerant passes through a second throttle valve to throttle and then towards the double-fluid passage heat exchanger. The system can work in outdoor environment with ultra low temperature; and in the deicing mode and the heating mode, a battery and other heating parts can be cooled at the same time.

Description

technical field [0001] The invention relates to the technical field of automobile air conditioning, in particular to an electric automobile air conditioning system. Background technique [0002] With the development of low-carbon economy, more stringent requirements are put forward for energy saving and emission reduction. Electric vehicles will become one of the aspects of future automobile development due to their energy-saving and environmental protection features. However, since electric vehicles use batteries as a power source, their air-conditioning systems are also different from the original automotive air-conditioning systems. [0003] With the continuous improvement of the quality of life, people pay more and more attention to the comfort in the car compartment. Traditional internal combustion engine vehicles can use the waste heat of the internal combustion engine and the heat of the engine exhaust to heat the compartment, while the power of electric vehicles main...

AI Technical Summary

Problems solved by technology

[0004] However, in the various heating methods mentioned above, if an independent heat source is used, such as purely using PTC for heating, it will consume more battery energy, which will reduce the mileage of the car; if fuel heating is used, not only the heating efficiency is low, It will also pollute the environment and increase the load on the car

In addition, the current car air conditioner blows out cold air in the compartment during demisting, which will cause discomfort in the compartment when the weather is relatively cold.

[0005] For example, the invention titled electric vehicle heat pump system and application number 200510027576.8 uses the heat pump system to control the temperature of electric vehicles, but the air conditioner has certain limitations on the defogging and defrosting modes. When the nearby dew point temperature is higher than the temperature of the outer glass, fog will be generated, affecting the driver's sight

And when the temperature outside the car is below zero, there may be rainwater or snow accumulated on the surface of the heat exchanger outside the car, causing the energy efficiency ratio to decrease during heating operation.

Therefore, for automotive air conditioners, defogging and deicing functions are required. When defogging and deicing are required, the internal condenser and internal evaporator cannot be turned on at the same time in this patent; at most, the internal evaporator can only be turned on separately. , that is to start the cooling mode, which will cause the temperature in the car to drop, which will greatly reduce the comfort in the car; and in addition, the patent does not provide cooling for heat-generating components such as batteries, which will affect the service life of heat-generating components such as batteries

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