Method for controlling defrosting of air conditioner of heat pump type electric automobile on basis of humidity sensor technology

Abstract

The invention discloses a method for controlling defrosting of an air conditioner of a heat pump type electric automobile on the basis of a humidity sensor technology. The method comprises the following steps: acquiring ambient humidity Hamb, ambient temperature Tamb and the surface temperature TEVAP of fins of an outdoor heat exchanger in a running process of the automobile through a temperature and humidity sensor, and storing acquired data once at set time intervals Tset; judging a current automobile running environment is in a common frost region or severe frost region in a theoretical frost region of an air heat source pump according to the ambient humidity Hamb and the ambient temperature Tamb, if the current automobile running environment is in the common frost region or severe frost region in the theoretical frost region of the air heat source pump, carrying out the next step, and if the current automobile running environment is not in the common frost region or severe frost region in the theoretical frost region of the air heat source pump, returning to the previous step; carrying out defrosting action for the time delta T; and judging whether the current surface temperature TEVAP of the fins of the current outdoor heat exchanger is greater than 0 DEG C or not, if the current surface temperature TEVAP of the fins of the current outdoor heat exchanger is greater than 0 DEG C, finishing defrosting control, and if the current surface temperature TEVAP of the fins of the current outdoor heat exchanger is not greater than 0 DEG C, returning to the previous step. By the method, defrosting action of a heat pump air conditioner system can be finished accurately and effectively, and energy consumption can be greatly reduced.

Description

technical field [0001] The invention relates to the field of electric vehicle air conditioner control, in particular to a heat pump type electric vehicle air conditioner defrosting control method based on humidity sensor technology. Background technique [0002] With the rapid development of the new energy electric vehicle industry, the energy consumption of the air conditioning system has an increasing impact on the cruising range of the vehicle, which also puts forward higher requirements for the energy saving and consumption reduction indicators of the electric air conditioning system. At present, the electric vehicle air conditioning system on the market mainly uses PTC to directly heat the air or the water heating PTC to heat the antifreeze and then use the warm air core to exchange heat with the air twice to solve the internal heating problem of the vehicle compartment. Due to the shortcomings of high energy consumption and low heating efficiency of PTC heaters, the lo...

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Problems solved by technology

[0007] Purpose of the invention: The purpose of the invention aims at the shortcomings of low defrosting efficiency and high energy consumption in the traditional defrosting method, and proposes a heat pump type electric vehicle air conditioner defrosting control method based on humidity sensor technology. The air humidity during driving is used as an input signal, and the air-conditioning controller conducts logical interpretation to determine the timing of entering and exiting defrosting, so as to ensure that the heat pump air-conditioning system can perform the defrosting cycle in a timely and effective manner, and ensure the operating efficiency of the air-conditioning system

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