Patent ID: 11938783
Assignee: DENSO CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  F  H  Y | IPC B  F

Claim 7:
8. A refrigeration cycle device comprising:
a compressor configured to draw and discharge a refrigerant;
a radiator configured to dissipate heat from the refrigerant discharged from the compressor;
a first pressure reducing valve configured to reduce a pressure of the refrigerant flowing from the radiator;
a first evaporator configured to exchange heat between the refrigerant decompressed in the first pressure reducing valve and air, and to evaporate the refrigerant;
a second pressure reducing valve disposed in parallel with the first pressure reducing valve in a flow of the refrigerant and configured to reduce the pressure of the refrigerant flowing from the radiator;
a second evaporator configured to evaporate the refrigerant pressure-reduced in the second pressure reducing valve, by absorbing heat from a battery;
a third pressure reducing valve configured to reduce the pressure of the refrigerant evaporated in the second evaporator; and
a controller configured to control opening degrees of the second pressure reducing valve and the third pressure reducing valve, wherein
the controller is configured to perform a limit control in which an opening degree of the second pressure reducing valve or the third pressure reducing valve is set at a smaller one of a battery cooling opening degree and an air cooling opening degree, the battery cooling opening degree being an opening degree for setting a battery cooling capacity of the second evaporator to a target battery cooling capacity, and the air cooling opening degree being an opening degree for setting an air cooling capacity of the first evaporator to a target air cooling capacity, and
the controller is configured in the limit control,
to set the air cooling opening degree to an opening degree for setting a temperature of the first evaporator to a target first evaporator temperature,
to set the battery cooling opening degree to an opening degree for setting a temperature of the second evaporator to a target second evaporator temperature,
to determine the target second evaporator temperature to be lower than a temperature of the battery by a predetermined temperature difference, and
to increase the predetermined temperature difference as a heat generation amount of the battery increases.