There is provided a vehicle air conditioning device of a heat pump system which improves comfortability when changing to heating only by an auxiliary heating device. The device includes a heating medium circulating circuit 23 to heat air to be supplied from an air flow passage 3 to a vehicle interior, and when shifting to the heating of the vehicle interior only by the heating medium circulating circuit 23 in a heating mode, a controller executes a shifting control to increase a heating capability of the heating medium circulating circuit 23 prior to stopping a compressor 2 and decrease a heating capability of a radiator 4 in accordance with the increase of the heating capability of the heating medium circulating circuit 23.

A thermal management arrangement for vehicles is disclosed including a refrigerant circuit having chillers and/or heat pump function and a heat carrier network for cooling and/or heating components of the vehicle. The heat carrier network has a heat carrier reservoir and a plurality of heat carrier supply segments fed from the heat carrier reservoir. A separately controlled and regulated ambient heat exchanger supply segment implements a circuit having a central low-temperature ambient heat exchanger and least one heat carrier reservoir.

A heating apparatus of the invention executes a first heating control for heating a heater core by a heat generation device when a process of heating the heater core is requested while an engine operation is stopped. The heating apparatus executes a second heating control for heating the cooling water which cooled an internal combustion engine, by the heat generation device and supplying the heated cooling water to the heater core when a heater core temperature is not increased to a requested temperature only by the heat generation device. The heating apparatus executes a third heating control for stopping the engine operation, heating the cooling water which cooled the internal combustion engine, by the heat generation device, and supplying the heated cooling water to the heater core when an engine temperature becomes equal to or higher than a predetermined temperature while the second heating control is executed.

This air conditioning device for a vehicle comprises: an indoor condenser; an indoor evaporator; a first expansion valve; a second expansion valve; a refrigerant line; an expansion valve control detector; and a controller. The expansion valve control detector is constituted by: only one temperature sensor that detects the temperature of refrigerant in an inter-expansion valve line of the refrigerant line; and only one pressure sensor that detects the pressure of the refrigerant in the inter-expansion valve line. During a cooling operation, the controller issues, to the first expansion valve, an opening command corresponding to a state quantity of the refrigerant that has been detected by the expansion valve control detector, and during a heating operation, the controller issues, to the second expansion valve, an opening command corresponding to a state quantity of the refrigerant that has been detected by the expansion valve control detector.

A heat pump system for vehicle may include first cooling apparatus that includes first radiator and first water pump connected by first coolant line, second cooling apparatus that includes second radiator and second water pump connected by second coolant line, battery module provided in battery coolant line selectively connectable to second coolant line through first valve, and chiller provided in battery coolant line, connected to refrigerant line of air conditioner through refrigerant connection line, and adjusting coolant temperature by heat-exchanging selectively received coolant with refrigerant, wherein main heat-exchanger provided is connected to first and second coolant lines to receive coolant circulating first and second cooling apparatuses, and wherein main heat-exchanger is connected to first and second connection lines connected to refrigerant line through refrigerant valve to condense or evaporate refrigerant through heat-exchanging with coolant such that flow direction of refrigerant is changed depending on mode of vehicle.

Systems and methods for heating and cooling a vehicle using a heat pump are disclosed herein. In one embodiment, a system for heating and cooling the vehicle includes a heat pump having: a compressor located in an engine compartment of the vehicle, and an evaporator located in a sleeper or a cab of the vehicle. The system also includes a controller for selecting a cooling mode or a heating mode for the heat pump. In one embodiment, the system includes a clutch for engaging the compressor with a transmission of the vehicle.

A heat pump system includes a compressor, a fluid switching device, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a flow regulating device and a throttle element. The second heat exchanger includes a first heat exchange portion and a second heat exchange portion. An outlet of the first heat exchange portion communicates with the throttle element. An inlet of the first heat exchange portion communicates with at least one of a second port of the third heat exchanger and an outlet of the fourth heat exchanger. An inlet of the second heat exchange portion communicates with the outlet of the first heat exchanger. An outlet of the second heat exchange portion communicates with an inlet of the compressor. In a heating mode, the function of the second heat exchanger is reduced, thereby the heating capacity of the heat pump system is improved.

A method of operating a cooling system for a vehicle including providing a cooling system including a coolant loop having a coolant valve, a first refrigerant loop having a first compressor and a first chiller configured to exchange heat with the coolant loop, a second refrigerant loop having a second compressor and a second chiller configured to exchange heat with the coolant loop, and a cooling system controller operably coupled to the first compressor, the second compressor, and the coolant valve. The coolant valve is configured to selectively direct or prevent the flow of coolant between the battery and each of the first chiller and the second chiller. The method further includes operating the cooling system in one of a second chiller only mode, a first chiller only mode, an air conditioning (AC) only mode, a first refrigerant loop only mode, and a dual refrigerant loop mode.

A refrigeration circuit for a vehicle system includes a compressor, an evaporator, an accumulator, an inlet tube, an outlet tube, and a bypass valve. The inlet tube is configured to deliver refrigerant from the evaporator to the accumulator. The outlet tube is configured to deliver refrigerant from the accumulator to the compressor. The bypass valve is in fluid communication with the inlet and outlet tubes. The bypass valve has an open position and a closed position. The bypass valve is configured to direct refrigerant flow from the inlet tube to the outlet tube to bypass the accumulator when in the open position. The bypass valve is configured to restrict refrigerant from flowing from the inlet tube to the outlet tube when in the closed position.

A vehicle HVAC system includes a compressor, a first heat exchanger for exchanging heat between the refrigerant outside air, a first check valve set, a first expansion device for decompressing a first portion of the refrigerant, a second heat exchanger for exchanging heat between the first portion of the refrigerant and a second portion of the refrigerant, a second expansion device for decompressing the second portion of the refrigerant, a second check valve set, a third heat exchanger for exchanging heat between the refrigerant and inside air, and a selector valve for switching between a heating mode and a cooling mode. The first check valve set and the second check valve set together maintain a constant flow direction through the first expansion device, the second heat exchanger, and the second expansion device between the heating mode and the cooling mode.