초록 ▼

An external heat exchanger of a heat pump air-conditioner on an electric vehicle is determined as being frosted based on signals from temperature sensors. If the external heat exchanger is frosted, then a frosting flag is set and the air-conditioner is operated in a cooling mode to radiate heat from

An external heat exchanger of a heat pump air-conditioner on an electric vehicle is determined as being frosted based on signals from temperature sensors. If the external heat exchanger is frosted, then a frosting flag is set and the air-conditioner is operated in a cooling mode to radiate heat from the external heat exchanger for thereby defrosting the external heat exchanger while the air-conditioner is in a pre-air-conditioning mode before the driver enters the electric vehicle or while the battery on the electric vehicle is being charged. While the battery is being charged, the external heat exchanger is defrosted by the electric energy supplied from an external power supply to charge the battery.

대표청구항 ▼

A defrosting control system in a heat-pump air-conditioner for air-conditioning an electric vehicle with a compressor that is electrically actuated by the electric energy stored in a battery on the electric vehicle, comprising: frosting determining means for determining whether an external heat exch

A defrosting control system in a heat-pump air-conditioner for air-conditioning an electric vehicle with a compressor that is electrically actuated by the electric energy stored in a battery on the electric vehicle, comprising: frosting determining means for determining whether an external heat exchanger of the air-conditioner is frosted; air-conditioning operation detecting means for detecting whether the air-conditioner is operating in a pre-air-conditioning mode before a driver enters the electric vehicle; and defrosting means for operating the air-conditioner to defrost the external heat exchanger by causing the external heat exchanger to function as a heat radiator when the external heat exchanger is determined as being frosted by said frosting determining means and the air-conditioner is determined as operating in the pre-air-conditioning mode by said air-conditioning operation detecting means.