VEHICLE AIR-CONDITIONING DEVICE

WIPO Patent Application WO/2024/090118

A1

[Problem] To smoothly execute a preparatory operation performed at the start of a hot gas heating operation and obtain desired heating performance. [Solution] This vehicular air-conditioning device comprises: a refrigerant circuit including a compressor, an indoor heat exchange unit, and an external heat exchange unit; an air-conditioning unit having an indoor heat exchange unit disposed therein; and a control device that controls the refrigerant circuit and the air-conditioning unit. The refrigerant circuit has a hot gas bypass that reduces the pressure of, and returns to the compressor, at least a portion of a refrigerant compressed by the compressor, without passing through the indoor heat exchange unit and the external heat exchange unit. The control device: is capable of executing a hot gas heating operation in which the portion of the refrigerant compressed by the compressor is caused to release heat in the indoor heat exchanger, without being caused to absorb heat in the external heat exchange unit, so as to heat the vehicle interior; performs, at the start of the hot gas heating operation, a preparatory operation in which the refrigerant is circulated through the refrigerant circuit, while preventing or suppressing heat radiation in the indoor heat exchange unit, until the refrigerant reaches a prescribed state; and restricts air volume adjustment of the volume of air blown into the vehicle interior at least during the preparatory operation.

OKADA MIZUKI (JP)
HUANG YUNSHENG (JP)
MAJIMA HIROTO (JP)
ZHANG HONGMING (JP)

PCT/JP2023/035329

May 02, 2024

September 28, 2023

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SANDEN CORP (JP)

B60H1/22

WO2022201568A1

2022-09-29

JPH0478716A	1992-03-12
JP2004017684A	2004-01-22

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