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:
Mar. 26, 2024
Filed:
Feb. 12, 2020
Mitsubishi Heavy Industries Thermal Systems, Ltd., Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD, Tokyo, JP;
Abstract
The purpose of the present invention is to provide a vehicle air conditioning system and a control method of the vehicle air conditioning system which enable detecting leaks of flammable refrigerant without requiring a separate sensor. This vehicle air conditioning system is provided with: a refrigeration cycle for cooling (); a heat pump cycle for heating (); a refrigerant that is very flammable, has an explosive range near room temperature, and circulates in the refrigeration cycle for cooling () and the heat pump cycle for heating (); an outside temperature sensor () which detects the outside temperature; a pressure sensor () which detects the refrigerant pressure; and a control device which calculates the refrigerant density, which is the density of refrigerant, on the basis of the outside temperature and the pressure, and determines whether or not the refrigerant density has fallen below a prescribed threshold value which is based on the amount of sealed refrigerant, the total volume in the refrigeration cycle for cooling () and in the heat pump cycle for heating (), the volume of the vehicle cabin, the standard density of the atmosphere, and the explosive limit of the refrigerant.