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:
Jul. 07, 1987
Filed:
Sep. 11, 1985
Seiji Sumikawa, Konan, JP;
Ichiro Noguchi, Konan, JP;
Diesel Kiki Co., Ltd., Tokyo, JP;
Abstract
An air conditioning system for automotive vehicles wherein the temperature and pressure of refrigerant at the outlet of the evaporator are detected, respectively, by a temperature sensor and a pressure sensor, and the flow rate of refrigerant within the refrigerating cycle is controlled to proper values corresponding to thermal load on the system, by controlling the opening of an expansion valve with a valve control means responsive to output signals from the above sensors. The pressure of refrigerant detected by the pressure sensor is converted by conversion means into a corresponding saturation temperature of the refrigerant. Determining means determines whether or not the refrigerant quantity is insufficient by comparing the difference between the refrigerant temperature and the corresponding saturation temperature of the refrigerant with a predetermined reference value. Indicator means indicates abnormality when the refrigerant quantity is determined to be insufficient. The valve control means causes disengagement of the electromagnetic clutch of the compressor to render the refrigerant compressor inoperative when the refrigerant quantity is determined to be insufficient.