A vehicle heat pump system includes a compressor, a first valve coupled to an outlet of the compressor, a cooling circuit between the first valve and the inlet of the compressor, a heating circuit between the first valve and the inlet of the compressor and a controller. The heating circuit includes
A vehicle heat pump system includes a compressor, a first valve coupled to an outlet of the compressor, a cooling circuit between the first valve and the inlet of the compressor, a heating circuit between the first valve and the inlet of the compressor and a controller. The heating circuit includes a heating circuit evaporator and a second valve between the heating circuit evaporator and the inlet of the compressor. The controller is configured to operate the first valve to switch between a cooling mode and a heating mode, cycle the second valve opened and closed in the heating mode, such that when closed, the compressor draws refrigerant out of the cooling circuit and refrigerant pressure builds up within the heating circuit, and maintain the second valve open upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit during the cycling of the second valve.
대표청구항▼
1. A vehicle heat pump system comprising: a compressor including an inlet side and an outlet side;a first valve fluidly coupled to the outlet side of the compressor to receive compressed refrigerant exiting the outlet side of the compressor;a cooling circuit being fluidly coupled between the first v
1. A vehicle heat pump system comprising: a compressor including an inlet side and an outlet side;a first valve fluidly coupled to the outlet side of the compressor to receive compressed refrigerant exiting the outlet side of the compressor;a cooling circuit being fluidly coupled between the first valve and the inlet side of the compressor;a heating circuit fluidly coupled between the first valve and the inlet side of the compressor, the heating circuit including a heating circuit evaporator, the heating circuit further including a second valve located between the heating circuit evaporator and the inlet side of the compressor, the first valve being configured to switch direction of flow of compressed refrigerant exiting the compressor between flowing to the cooling circuit establishing a cooling mode and flowing to the heating circuit establishing a heating mode, the second valve being configured to switch between an open state and a closed state such that in the open state refrigerant within the heating circuit flows to the inlet side of the compressor and in the closed state refrigerant within the heating circuit is prevented from flowing to the inlet side of the compressor; anda controller operatively coupled to the first and second valves, the controller being configured to switch the first valve to block refrigerant flow to the heating circuit and direct refrigerant flow to the cooling circuit to establish the cooling mode,the controller being configured to switch the first valve to block refrigerant flow to the cooling circuit and direct refrigerant flow to the heating circuit to establish the heating mode, and the controller being further configured such that while operating in the heating mode the controller cycles the second valve between the open state where refrigerant flows from the heating circuit to the inlet of the compressor and the closed state where the second valve blocks refrigerant flow from the heating circuit to the inlet side of the compressor, such that with the second valve in the closed state the compressor draws refrigerant out of the cooling circuit and refrigerant pressure builds up within the heating circuit, andthe controller being further configured to maintain the second valve in the open state upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit during the cycling of the second valve while operating in the heating mode. 2. The vehicle heat pump system according to claim 1, wherein the cooling circuit includes a cooling circuit condenser and a cooling circuit evaporator. 3. The vehicle heat pump system according to claim 1, further comprising a vehicle having a vehicle structure and a passenger compartment within the vehicle structure, the heating circuit evaporator being positioned within the passenger compartment, andthe heating circuit includes a heating circuit condenser that is also positioned within the passenger compartment. 4. The vehicle heat pump system according to claim 3, wherein the heating circuit evaporator includes a blower motor configured to force airflow across heat exchanging surfaces of the heating circuit evaporator and direct airflow out of the passenger compartment. 5. The vehicle heat pump system according to claim 1, wherein the heating circuit evaporator includes a blower motor configured to force airflow across heat exchanging surfaces of the heating circuit evaporator. 6. The vehicle heat pump system according to claim 1, wherein the cooling circuit includes a cooling circuit evaporator and a cooling circuit condenser, andthe heating circuit is fluidly coupled to the cooling circuit evaporator such that while the first valve is operated to establish the heating mode, the cooling circuit evaporator operates as a heating circuit condenser in the heating circuit. 7. The vehicle heat pump system according to claim 6, further comprising a vehicle having a vehicle structure and a passenger compartment within the vehicle structure, the heating circuit evaporator and the cooling circuit evaporator both being positioned within the passenger compartment, and the cooling circuit condenser being positioned within the vehicle structure outside of the passenger compartment. 8. The vehicle heat pump system according to claim 7, wherein the heating circuit evaporator includes a blower motor configured to force airflow across heat exchanging surfaces of the heating circuit evaporator and direct airflow from the passenger compartment. 9. The vehicle heat pump system according to claim 6, further comprising a third valve between the cooling circuit condenser and the cooling circuit evaporator, andthe controller further controlling the first, second and third valves by:operating the first valve to direct refrigerant flow from the cooling circuit condenser to the inlet side of the compressor while the first valve is operated to establish the heating mode, andoperating the third valve to block flow of refrigerant between the cooling circuit condenser and the cooling circuit evaporator while the first valve is operated to establish the heating mode. 10. A vehicle heat pump system comprising: a compressor including an inlet side and an outlet side;a first valve fluidly coupled to the outlet side of the compressor to receive compressed refrigerant exiting the outlet side of the compressor;a cooling circuit being fluidly coupled between the first valve and the inlet side of the compressor:a heating circuit fluidly coupled between the first valve and the inlet side of the compressor, the heating circuit including a heating circuit evaporator, the heating circuit further including a second valve located between the heating circuit evaporator and the inlet side of the compressor;a controller operatively coupled to the first and second valves, the controller controlling the first and second valves by:operating the first valve to block refrigerant flow to the heating circuit and direct refrigerant flow to the cooling circuit to establish a cooling mode,operating the first valve to block refrigerant flow to the cooling circuit and direct refrigerant flow to the heating circuit to establish a heating mode,cycling the second valve between an open state where refrigerant flows from the heating circuit to the inlet of the compressor and a closed state where the second valve blocks refrigerant flow from the heating circuit to the inlet side of the compressor while the first valve is operated to establish the heating mode, such that with the second valve in the closed state the compressor draws refrigerant out of the cooling circuit and refrigerant pressure builds up within the heating circuit, andmaintaining the second valve in the open state upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit during the cycling of the second valve, anda third valve located between the cooling circuit evaporator and the inlet side of the compressor, andthe controller is operatively coupled to the third valve, the controller controlling the third valve by:operating the third valve temporarily to an open state where refrigerant flows from the cooling circuit to the inlet of the compressor while the first valve is operated to establish the heating mode and the second valve is cycling between the open state and the closed state, andoperating the third valve to a closed state isolating the cooling circuit from the heating circuit while the second valve is set to the open state upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit with the second valve in the closed state. 11. A vehicle including a heat pump system comprising: a vehicle structure and a passenger compartment within the vehicle structure;a compressor coupled to the vehicle structure, the compressor including an inlet side and an outlet side;a first valve fluidly coupled to the outlet side of the compressor to receive compressed refrigerant exiting the outlet side of the compressor;a cooling circuit being fluidly coupled between the first valve and the inlet side of the compressor to cool the passenger compartment of the vehicle;a heating circuit fluidly coupled between the first valve and the inlet side of the compressor to heat the passenger compartment of the vehicle, the heating circuit including a heating circuit evaporator positioned to absorb heat from airflow exhausting the passenger compartment, the heating circuit further including a second valve located between the heating circuit evaporator and the inlet side of the compressor, the first valve being configured to switch direction of flow of compressed refrigerant exiting the compressor between flowing to the cooling circuit establishing a cooling mode and flowing to the heating circuit establishing a heating mode, the second valve being configured to switch between an open state and a closed state such that in the open state refrigerant within the heating circuit flows to the inlet side of the compressor and in the closed state refrigerant within the heating circuit is prevented from flowing to the inlet side of the compressor; anda controller operatively coupled to the first and second valves, the controller being configured to switch the first valve to block refrigerant flow to the heating circuit and direct refrigerant flow to the cooling circuit to establish the cooling mode,the controller being configured to switch the first valve to block refrigerant flow to the cooling circuit and direct refrigerant flow to the heating circuit to establish the heating mode, and the controller being further configured such that while operating in the heating mode the controller cycles the second valve between an open state where refrigerant flows from the heating circuit to the inlet of the compressor and a closed state where the second valve blocks refrigerant flow from the heating circuit to the inlet side of the compressor, such that with the second valve in the closed state the compressor draws refrigerant out of the cooling circuit and refrigerant pressure builds up within the heating circuit, andthe controller being further configured to maintain the second valve in the open state upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit during the cycling of the second valve while operating in the heating mode. 12. The vehicle including a heat pump system according to claim 11, wherein the cooling circuit includes a cooling circuit condenser located within the vehicle structure outside of the passenger compartment and a cooling circuit evaporator located within the passenger compartment. 13. The vehicle including a heat pump system according to claim 12, wherein the cooling circuit includes a third valve located between the cooling circuit evaporator and the inlet side of the compressor, andthe controller is operatively coupled to the third valve, the controller controlling the third valve by:operating the third valve temporarily to an open state where refrigerant flows from the cooling circuit to the inlet of the compressor while the first valve is operated to establish the heating mode and the second valve is cycling between the open state and the closed state, andoperating the third valve to a closed state isolating the cooling circuit from the heating circuit while the second valve is set to the open state upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit with the second valve in the closed state. 14. The vehicle including a heat pump system according to claim 11, wherein the heating circuit includes a heating circuit condenser, with the heating circuit condenser and heating circuit evaporator being positioned within the passenger compartment. 15. The vehicle including a heat pump system according to claim 14, wherein the heating circuit evaporator includes a blower motor configured to force airflow across heat exchanging surfaces of the heating circuit evaporator and direct airflow out of the passenger compartment. 16. The vehicle including a heat pump system according to claim 11, wherein the heating circuit evaporator includes a blower motor configured to force airflow across heat exchanging surfaces of the heating circuit evaporator and direct airflow out of the passenger compartment. 17. The vehicle including a heat pump system according to claim 11, wherein the cooling circuit includes a cooling circuit evaporator located within the passenger compartment, andthe heating circuit is fluidly coupled to the cooling circuit evaporator such that while the first valve is operated to establish the heating mode, the cooling circuit evaporator operates as a heating circuit condenser in the heating circuit. 18. The vehicle including a heat pump system according to claim 17, wherein the heating circuit evaporator and the cooling circuit evaporator of the cooling circuit are both positioned within the passenger compartment. 19. The vehicle including a heat pump system according to claim 17, further comprising a third valve between the cooling circuit condenser and the cooling circuit evaporator, andthe controller further controlling the first, second and third valves by:operating the first valve to direct refrigerant flow from the cooling circuit condenser to the inlet side of the compressor while the first valve is operated to establish the heating mode, andoperating the third valve to block flow of refrigerant between the cooling circuit condenser and the cooling circuit evaporator while the first valve is operated to establish the heating mode.
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이 특허에 인용된 특허 (3)
Iritani Kunio (Anjo JPX) Isaji Akira (Nishio JPX) Suzuki Nobunao (Toyohashi JPX), Air conditioning apparatus for automobile.
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