A vehicle air conditioner includes: a refrigeration cycle in which a refrigerant circulates; a high-temperature cycle in which a first heat medium in liquid form heated by the refrigeration cycle circulates; a low-temperature cycle in which a second heat medium in liquid form cooled by the refrigeration cycle circulates; and a seat that is provided in a vehicle interior and has a warm flow passage and a cold flow passage disposed close to each other. The warm flow passage is provided on the route of the high-temperature cycle, and the cold flow passage is provided on the route of the low-temperature cycle.

A method for controlling torque of an air conditioner compressor is disclosed. In one example, the air conditioner compressor is a variable displacement compressor. The method may provide smooth transitions between different air conditioner compressor torques.

A variable displacement swash plate type compressor includes discharge passages through which refrigerant gas in a discharge passage is discharged. The discharge passages converge on downstream sides in the flowing direction of the refrigerant. A restrictor is provided in one of the discharge passages. The restrictor is used in the discharge passage to define first and second pressure monitoring points. Specifically, the first pressure monitoring point is located in the discharge passage on the upstream side of the restrictor in the flowing direction of refrigerant gas, and the second pressure monitoring point is located in the discharge passage on the downstream side of the restrictor.

The present invention relates to an air-conditioner system for a vehicle and a method for controlling the same, and more particularly, to an air-conditioner system for a vehicle and a method for controlling the same which can change a target superheat degree depending on variation in an amount of refrigerant discharged from a compressor, namely, gradually decrease the target superheat degree by stages as the amount of refrigerant discharged from the compressor decreases, and control an electronic expansion valve based on the target superheat degree dropping by stages, thereby preventing performance degradation of an air conditioner and stabilizing the system by restraining a change in the superheat degree in an area where an amount of refrigerant discharged from a compressor varies.

A method for controlling an air conditioner compressor of a vehicle is disclosed. The method includes adjusting a displacement command in response to an error between an expected air conditioner evaporator temperature and a measured or inferred air conditioner evaporator temperature, the displacement command is further adjusted via adding a value to the displacement command based on desired air conditioner evaporator temperature, the value determined apart from the error between the expected air conditioner evaporator temperature and the measured or inferred air conditioner evaporator temperature.

A vehicle accessory power management assembly has a power device, an accessory device, a power transmitting device and a controller. The power transmitting device has an input part coupled to the power device, an output part coupled to the accessory device, and a speed ratio switching part switchable between a first operating state in which the input part and the output part rotate at a first speed ratio relative to one another and a second operating state in which the input part and the output part rotate at a second speed ratio relative to one another. The controller is configured to switch the speed ratio switching part between the first operating state and the second operating state in response determining whether the speed of output of the power device is above a pre-determined value or below a pre-determined value.

A heat pump system for a vehicle includes a compressor; a four-way valve for transferring refrigerant to external or internal heat exchanger; the external heat exchanger for heat-exchanging between the external air and the refrigerant, the internal heat exchanger for heat-exchanging between the refrigerant and the air supplied to the interior of the vehicle, or for heat-exchanging between the refrigerant and the air supplied to the interior of the vehicle; an electric component cooling circuit which absorbs the heat from electric components in the vehicle, to emit same through electric component radiator, or which absorbs heat, and heat-exchanges with refrigerant/electric component coolant heat exchanger for heat-exchanging between the refrigerant and a coolant; a first expansion means for expanding the refrigerant; and a battery chiller which heat-exchanging between a battery and the refrigerant and transferring the refrigerant to the internal heat exchanger.

A method for controlling transitions between activating and deactivating a vehicle air conditioner compressor is disclosed. In one example, displacement of the air conditioner compressor is adjusted before the air conditioner is coupled to an energy conversion device. The method may provide smooth transitions between different air conditioner compressor control modes.

A vehicle thermal management system, includes: a refrigerant subsystem including a refrigerant circulation path; a first coolant subsystem including a first coolant circulation path and a PE component fluidly connected to the first coolant circulation path; a second coolant subsystem including a second coolant circulation path and a radiator and a pump fluidly connected to the second coolant circulation path; a heat exchanger including a refrigerant passage fluidly connected to the refrigerant circulation path, a first coolant passage fluidly connected to the first coolant circulation path, and a second coolant passage fluidly connected to the second coolant circulation path; and a controller configured for controlling the pump of the second coolant subsystem based on a temperature of a refrigerant flowing into the refrigerant passage of the heat exchanger and a temperature of a second coolant flowing into the second coolant passage of the heat exchanger.

The present invention relates to a vehicular air conditioning system and provides a vehicular air conditioning system capable of preventing overheating of an inverter that controls the rotation speed of an electric compressor without cutting off the inverter, and consequently preventing the stoppage of an air conditioner due to the cut-off of the inverter and the resultant stoppage of cooling of a passenger room. The vehicular air conditioning system includes an electric compressor, an inverter configured to control a rotation speed of the electric compressor, and a control part configured to execute control so that a refrigerant flow rate on an inlet side of the electric compressor increases when a temperature of the inverter is equal to or higher than a preset overheating warning temperature.