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. 12, 2006
Filed:
Feb. 10, 2004
Walter Demuth, Gerlingen, DE;
Rainer Heilig, Waghaeusel, DE;
Volker Kirschner, Muehlacker, DE;
Martin Kotsch, Ludwigsburg, DE;
Hans-joachim Krauss, Stuttgart, DE;
Hagen Mittelstrass, Bondorf, DE;
Harald Raiser, Balingen, DE;
Michael Sickelmann, Stuttgart, DE;
Karl-heinz Staffa, Stuttgart, DE;
Christoph Walter, Stuttgart, DE;
Walter Demuth, Gerlingen, DE;
Rainer Heilig, Waghaeusel, DE;
Volker Kirschner, Muehlacker, DE;
Martin Kotsch, Ludwigsburg, DE;
Hans-Joachim Krauss, Stuttgart, DE;
Hagen Mittelstrass, Bondorf, DE;
Harald Raiser, Balingen, DE;
Michael Sickelmann, Stuttgart, DE;
Karl-Heinz Staffa, Stuttgart, DE;
Christoph Walter, Stuttgart, DE;
BEHR GmbH & Co., Stuttgart, DE;
Abstract
The invention relates to a method of refrigerant level monitoring in a refrigerant circuit of an air-conditioning or heat-pump system having a compressor and a refrigerant which may, depending on the operating point, be operated in the supercritical range. The method includes standstill level monitoring with the compressor switched off and/or in-operation level monitoring with the compressor switched on. In the case of in-operation level monitoring, the refrigerant overheat (dTü) at the evaporator is registered and, in the event of excessive overheat, it is concluded that there is underfilling. At a standstill, the pressure and temperature of the refrigerant are registered, and it is concluded that there is an improper refrigerant filling level if the pressure (p) lies below a minimum pressure value (p) or the temperature (T) lies above a maximum saturation temperature value (T) with the pressure being outside a predefinable intended pressure range ([p,p]).