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:
Dec. 22, 2020
Filed:
Sep. 07, 2017
Sanden Automotive Climate Systems Corporation, Isesaki, JP;
Tetsuya Ishizeki, Isesaki, JP;
Yuma Yamazaki, Isesaki, JP;
Akira Horikoshi, Isesaki, JP;
Ryo Miyakoshi, Isesaki, JP;
Kohei Yamashita, Isesaki, JP;
Megumi Shigeta, Isesaki, JP;
SANDEN AUTOMOTIVE CLIMATE SYSTEMS CORPORATION, Gunma, JP;
Abstract
A vehicle air conditioner is provided which is capable of detecting a refrigerant lack accompanying a refrigerant leakage and the like over time at the earliest possible stage and protecting a compressor. The vehicle air conditioner is provided with a compressor, a radiator, an outdoor expansion valve, and a heat absorber. The vehicle air conditioner holds normal time data indicating a relation between the number of revolutions NC of the compressor and a discharge refrigerant temperature Td thereof when a sufficient amount of refrigerant is filled in a refrigerant circuit R. The present invention calculates a discharge refrigerant temperature estimated value Tdst in normal time from the normal time data on the basis of a current number of revolutions NC and compares the discharge refrigerant temperature estimated value Tdst with a current discharge refrigerant temperature Td to determine a refrigerant lack of the refrigerant circuit.