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:
Oct. 16, 1984
Filed:
Jul. 16, 1982
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A refrigeration system for use in an automotive air conditioning system has a vane type variable displacement refrigerant compressor drivingly connectable by an electromagnetic clutch to an automotive engine and a refrigerant evaporator through which air is caused to flow by a blower. The compressor is provided with one or two unloading ports for releasing the refrigerant being compressed and with a valve member or members associated with the unloading port or ports. The air temperature just downstream of the evaporator is detected by a sensor which emits a signal to an electric circuit for actuating the valve member or members so that the unloading port or ports are selectively opened to vary the compressor displacement to provide a multistage compressor displacement control. The electric circuit is also operative to control the electromagnetic clutch to selectively connect and disconnect the compressor to and from the engine.