An air conditioning system of a vehicle having an internal combustion engine includes a condenser configured to receive refrigerant output by an electric compressor and transfer heat from the refrigerant within the condenser to air passing the condenser. A first evaporator is configured to receive refrigerant from the condenser when a first control valve is open and transfer heat from air passing the first evaporator to the refrigerant within the first evaporator. A first blower is configured to blow air across the first evaporator to a first section of a cabin of the vehicle. A second evaporator is configured to receive refrigerant from the condenser when a second control valve is open and transfer heat from air passing the second evaporator to the refrigerant within the second evaporator. A second blower is configured to blow air across the second evaporator to a second section of the cabin of the vehicle.

An air conditioning system of a vehicle having an internal combustion engine includes a condenser configured to receive refrigerant output by an electric compressor and transfer heat from the refrigerant within the condenser to air passing the condenser. A first evaporator is configured to receive refrigerant from the condenser when a first control valve is open and transfer heat from air passing the first evaporator to the refrigerant within the first evaporator. A first blower is configured to blow air across the first evaporator to a first section of a cabin of the vehicle. A second evaporator is configured to receive refrigerant from the condenser when a second control valve is open and transfer heat from air passing the second evaporator to the refrigerant within the second evaporator. A second blower is configured to blow air across the second evaporator to a second section of the cabin of the vehicle.

An air conditioning system of a vehicle having an internal combustion engine includes a condenser configured to receive refrigerant output by an electric compressor and transfer heat from the refrigerant within the condenser to air passing the condenser. A first evaporator is configured to receive refrigerant from the condenser when a first control valve is open and transfer heat from air passing the first evaporator to the refrigerant within the first evaporator. A first blower is configured to blow air across the first evaporator to a first section of a cabin of the vehicle. A second evaporator is configured to receive refrigerant from the condenser when a second control valve is open and transfer heat from air passing the second evaporator to the refrigerant within the second evaporator. A second blower is configured to blow air across the second evaporator to a second section of the cabin of the vehicle.

A refrigeration cycle device includes: a variable displacement compressor including a discharge capacity varying part to change a refrigerant discharge capacity; a controller that outputs a capacity control signal to the variable displacement compressor to change the refrigerant discharge capacity; a heat exchanger that condenses or cools refrigerant discharged from the variable displacement compressor; a decompressor that decompresses and expands refrigerant flowing out of the heat exchanger; an evaporator that evaporates refrigerant decompressed and expanded by the decompressor; and a high load determiner that determines whether the compressor is in a high load operational status based on the capacity control signal.

An air conditioning apparatus for recreational vehicles comprises a refrigeration circuit for circulating a refrigerant fluid, said refrigeration circuit including: a condenser, an expansion valve, an evaporator, in heat exchange with a room of the recreational vehicle to be air-conditioned, a compressor, and a leakage detection system, including: a refrigerant fluid sensor, configured to detect a control parameter representative of a physical condition of the refrigerant fluid at the outlet of the evaporator or at the inlet of the condenser; a control unit, connected to the refrigerant fluid sensor, and to the compressor.

A method for adaptive power engine control of a transport refrigeration unit (TRU) is provided. The method includes determining a current compressor power of a compressor of the TRU. The method also includes determining an adaptive compressor power error of the compressor. Also, the method includes calculating and setting a target compressor power of the compressor based on the current compressor power and the adaptive compressor power error. Further, the method includes determining a suction pressure control point of the compressor based on the target compressor power and a compressor curve map. Moreover, the method includes operating the compressor with the suction pressure control point of the compressor.

Vehicle air conditioning device comprising a bypass pipe which passes a radiator and an outdoor expansion valve, and opening/closing valves. A control device executes a heating mode to open solenoid valve 30 and close solenoid valve 40, and a dehumidifying and heating mode to close the solenoid valve 30, open solenoid valve 40, let a refrigerant radiate heat in outdoor heat exchanger 7, let the refrigerant absorb heat in heat absorber 9, and generate heat in auxiliary heater 23. When changing from the heating mode to the dehumidifying and heating mode, the control device sends the refrigerant to receiver drier portion 14, controls a compressor to reduce a difference between pressures before and after the solenoid valve 40, opens solenoid valve 40, closes solenoid valve 30, shuts off the outdoor expansion valve, and shifts the compressor to control in the dehumidifying and heating mode.

A system is disclosed for incorporation into a refrigerated delivery vehicle, the system enabling efficient cooling of the refrigerated compartment of a vehicle to avoid unnecessary idling of the vehicle's engine.

When the magnitude of a motor current Iu is smaller than a threshold value at a timing when a polarity of the motor current Iu is expected to be reversed after the elapse of one control cycle, a control device sets a correction amount of a width of a pulse generated by PWM control at a correction amount +. When the magnitude of the motor current is greater than the threshold value at the timing, the control device sets the correction amount of the width of the pulse generated by the PWM control at zero or a value smaller than the correction amount +. As a result, an error of a dead time period in inverter control can be reduced.

Disclosed are climate systems and methods for control the climate systems. A climate system includes a plurality of compressors, a first heat exchanger disposed downstream of the compressors and a second heat exchanger disposed downstream of the first heat exchanger. The compressors and heat exchangers are fluidly connected by refrigerant lines to form a refrigerant circuit. The climate system also includes a controller that controls the operation of the compressors to draw back lubricant to the compressors without use of an oil equalization system.