Method for operating a refrigerant circuit, method for operating a motor vehicle driving engine, and refrigerant circuit

US6817193B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Roland Caesar · Stuttgart, DE
• Thomas Finkenberger · Weingarten, DE
• Jan Gaertner · Stuttgart, DE
• Wolfgang Straub · Deggingen, DE
• Juergen Wertenbach · Fellbach, DE

Key dates

• Filing date: Nov 21, 2002
• Grant date: Nov 16, 2004
• Expiry date: Nov 21, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25B2700/2116
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A refrigerant circuit for a motor vehicle air-conditioning system has a refrigerant compressor, a cooler connected downstream of the refrigerant compressor, a restrictor for expanding the refrigerant, and an evaporator for transferring heat to the refrigerant. Pressure in the refrigerant circuit is measured firstly on the high-pressure side and secondly on the low-pressure side. An air-conditioning system can be driven directly or indirectly by the motor vehicle driving engine. The refrigerant in the refrigerant circuit is almost completely liquefied upstream of the restrictor, so that it is easy to determine the refrigerant mass flow. As a result, it becomes possible to determine the compressor torque which is consumed by the refrigerant circuit and to control the motor vehicle driving engine accordingly.