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. 09, 2001
Filed:
Jul. 26, 2000
Thomas Finkenberger, Kernen-Stetten, DE;
Florian Kauf, Stuttgart, DE;
Jürgen Wertenbach, Fellbach, DE;
DaimlerChrysler AG, , DE;
Abstract
The invention relates to a method for operating a subcritically and transcritically operated vehicle air conditioner having a vapor compression circuit in which in which a compressor, a gas cooler, an expansion valve and an evaporator are connected in series and form an integral closed cycle. On the high-pressure side of the vapor compression circuit, for the purpose of offering refrigerating capacity, a pressure is produced which is supercritical with reference to the critical pressure of the refrigerant circulating in the circuit, and a subcritical pressure is reached simultaneously on the low-pressure side of the circuit. Thermal energy is fed via the evaporator to the refrigerant cooled down on the low-pressure side with the refrigerant mass flow being regulated by the compressor and the desired high pressure being set by means of an expansion valve. During the starting operation of the vehicle air conditioner the refrigerant mass flow is set directly to a required value and the refrigerant pressure is set in accordance with at least one prescribed parameter, and the air conditioner is regulated upon the overshooting of safety pressure limits P1-P4, the regulation depending upon which safety pressure limits are overshot.