The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2021
Filed:
May. 11, 2017
Sanden Automotive Climate Systems Corporation, Isesaki, JP;
Tetsuya Ishizeki, Isesaki, JP;
Yuma Yamazaki, Isesaki, JP;
Akira Horikoshi, Isesaki, JP;
Kohei Yamashita, Isesaki, JP;
Ryo Miyakoshi, Isesaki, JP;
Megumi Shigeta, Isesaki, JP;
SANDEN AUTOMOTIVE CLIMATE SYSTEMS CORPORATION, Gunma, JP;
Abstract
There is disclosed a vehicle air conditioning device which is capable of judging, as early as possible, refrigerant shortage, for example, due to leakage of refrigerant with elapse of time, and protecting a compressor. The vehicle air conditioning device includes a compressor, a radiator, an outdoor expansion valve, and a heat absorber. A control device possesses normal time data indicating a relation between a suction refrigerant temperature Ts and a discharge refrigerant temperature Td of the compressor when a refrigerant circuit R is charged with a sufficient amount of the refrigerant. The control device calculates, from the normal time data, a discharge refrigerant temperature estimated value Tdst at normal time on the basis of the current suction refrigerant temperature Ts, and compares the value and the current discharge refrigerant temperature Td, thereby judging refrigerant shortage of the refrigerant circuit.