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.