A control method includes obtaining an operating instruction including a set operating duration, determining a first maximum operating power of an air conditioner of a vehicle according to the set operating duration and a current remaining charge of a battery of the vehicle, controlling the air conditioner to operate in a power range not exceeding the first maximum operating power, recording a continuous operating duration of the air conditioner and obtaining a real-time remaining charge of the battery, determining a second maximum operating power of the air conditioner according to the continuous operating duration and the real-time remaining charge, and controlling the air conditioner to continue operating in a power range not exceeding the second maximum operating power.

An in-vehicle air conditioning device includes a refrigerant circuit and a controller. The refrigerant circuit includes an electric compressor, a condenser, an expansion valve, and an evaporator. A refrigerant circulates through the refrigerant circuit. The refrigerant circuit includes a pipe which is connected to the electric compressor and through which the refrigerant discharged from the electric compressor flows. The controller calculates a pulsation frequency of pulsation generated in the pipe based on a target rotational speed for the electric compressor based on an air conditioning request. The controller calculates an air column resonance frequency of the pipe based on a sonic speed of the refrigerant and a length of the pipe. When the pulsation frequency is within a predetermined frequency band including the air column resonance frequency, the controller updates the target rotational speed for the electric compressor so as to avoid the pulsation frequency being within the frequency band.

An in-vehicle air conditioning device includes a refrigerant circuit, a first cooling liquid circuit, a second cooling liquid circuit, a housing covering the refrigerant circuit, a gas sensor inside the housing, and a controller configured to control a compressor of the refrigerant circuit. The refrigerant circuit includes a compressor, a condenser for heat dissipation, an expansion valve, and an evaporator for heat absorption, and circulates a hydrocarbon-based refrigerant. The first cooling liquid circuit includes a radiator and circulates a cooling liquid heated by the condenser of the refrigerant circuit. The second cooling liquid circuit includes a cooler core for cooling an air conditioning airflow, and circulates the cooling liquid cooled by the evaporator of the refrigerant circuit. When the controller receives a command to activate the compressor, the controller avoids activation of the compressor when the gas concentration detected by the gas sensor is higher than a predetermined concentration.

In a heat management system for a vehicle, and a control method thereof, the control method includes: determining whether a delayed operation condition of a compressor is satisfied while the compressor is not operated; controlling an operation of the compressor to be delayed based on the determining that the delayed operation condition of the compressor is satisfied; determining whether a battery cooling condition is satisfied based on the determining that the delayed operation condition of the compressor is not satisfied; and controlling the compressor to be operated based on the determining that the battery cooling condition is satisfied.