When at least one of a first condition that a set compressor rotational speed is equal to or less than a compressor rotational speed limit set in advance based on a predetermined noise regulation value and a second condition that a set fan rotational speed is equal to or less than a fan rotational speed limit set in advance based on the predetermined noise regulation value is not satisfied, a cooling device sets a corrected compressor rotational speed such that noise generated with actuation of a compressor and a fan reaches the predetermined noise regulation value or less, and sets a corrected fan rotational speed based on the corrected compressor rotational speed. The cooling device sets a lower value of the corrected fan rotational speed for a higher corrected compressor rotational speed.

A method for operating an electromotive refrigerant compressor having an electric motor, includes operating the electric motor using a supply voltage from a second on-board electrical system. The electric motor is operated in an emergency mode if a fault in a low-voltage supply from a first on-board electrical system and/or a fault in a bus for transmitting a control signal, in particular for a desired rotation speed of the electric motor, to the electromotive refrigerant compressor, are/is detected. An electromotive refrigerant compressor, an air-conditioning installation including such an electromotive refrigerant compressor, a computer program product and a computer-readable medium, are also provided.

In at least one embodiment, a vehicle climate control system including a compressor, at least one sensor, and at least one controller is provided. The compressor is configured to circulate fluid about a refrigerant loop. The at least one sensor is configured to provide a signal indicative of a pressure of the fluid in the refrigerant loop. The at least one controller is programmed to control a first valve to open to enable the fluid to flow to an evaporator for a battery responsive to the pressure of the fluid being greater than a predetermined pressure level to reduce the pressure of the fluid.

In a vehicle air conditioning apparatus, during a cooling operation, and a cooling and dehumidifying operation, a refrigerant flows through an outdoor heat exchanger, flows through a supercooling radiator, and then flows into a radiator to absorb heat. During a heating operation, the refrigerant flows through a heat exchanger and then is sucked into a compressor without passing through the supercooling radiator. During a first heating and dehumidifying operation, the refrigerant flows through another radiator, flows through the supercooling radiator, and then flows into another heat exchanger to absorb heat.

Systems and methods for operating a heater for a passenger cabin of a vehicle. In one example, fan speed of an evaporator cooling fan is adjusted to improve heating efficiency. In particular, fan speed is incrementally increased and maintained at the higher speed if output power of a compressor is reduced by more than an amount of power used to incrementally increase the fan speed.

There is disclosed a vehicle air conditioner which is capable of enlarging an effective range of a dehumidifying and heating mode to environmental conditions and smoothly dehumidifying and heating a vehicle interior. A vehicle air conditioner 1 executes a dehumidifying and heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, and decompresses the refrigerant by which heat has been radiated and then lets the refrigerant absorb heat in a heat absorber 9 and an outdoor heat exchanger 7, the controller decreases an outdoor blower voltage FANVout of an outdoor blower 15 and decreases an air volume into the outdoor blower 15 in a case where a temperature Te of the heat absorber 9 is high even when the controller adjusts a valve position of an outdoor expansion valve 6 into a lower limit of controlling in a situation in which a temperature TCI of the radiator 4 is satisfactory.

A control apparatus for a compressor of a vehicle capable of turning-on/off a compressor based on coolant pressure of an air conditioner in the winter and a method thereof are provided. The control apparatus includes a compressor that is configured to reduce a temperature by compressing a coolant of an air conditioner and a controller that is configured to operate the compressor, to confirm an operation coolant pressure of the air conditioner after operating the compressor. The controller also operates the compressor based on the operation coolant pressure of a measured coolant pressure of the air conditioner when an ambient temperature of the vehicle is less than a reference temperature.

In a vehicle air conditioning apparatus, during a cooling operation, and a cooling and dehumidifying operation, a refrigerant flows through an outdoor heat exchanger, flows through a supercooling radiator, and then flows into a radiator to absorb heat. During a heating operation, the refrigerant flows through a heat exchanger and then is sucked into a compressor without passing through the supercooling radiator. During a first heating and dehumidifying operation, the refrigerant flows through another radiator, flows through the supercooling radiator, and then flows into another heat exchanger to absorb heat.

A cooling device for, for example, a cooling object has a refrigerant circuit with an evaporator, in which a cold air flow for the cooling object exchanges heat with the refrigerant, and a defrosting system for de-icing the evaporator. The defrosting system is controlled according to the degree of icing of the evaporator. The degree of icing of the evaporator is determined by the control unit of the defrosting system on the basis of the temperature of the cold air flow from the cooling object to the evaporator, the temperature and/or the operating pressure of the refrigerant upstream of the evaporator and at least one operating parameter of the compressor.

The present invention discloses a vehicle refrigeration system, which includes: a refrigeration module which has a compressor 20, a condenser 31, a throttling element 40 and an evaporator 50 that are connected in sequence through a pipeline; and a power module which has an engine 10 linked to the compressor 20; where the engine has a variable speed component which is capable of causing the engine to run at different multistep or stepless rotating speeds. Through the vehicle refrigeration system, the present invention solves technical problems that exist in the existing vehicle refrigeration system, for example, the vehicle refrigeration system has poor regulation capability, is not applicable to extreme working conditions and the like.