Daimler Ag

Daimler Chrysler Ag

Roland Caesar

Jan Gaertner

Juergen Wertenbach

Wolfgang Straub

Thomas Finkenberger

Joan Aguilar Rojas

A refrigerant compressor has a control valve for controlling the degree of conveyance of the refrigerant compressor by setting a drive housing pressure pof the refrigerant compressor. A control body controls a conveying-side control line between a discharge chamber, acted upon by high pressure of the compressor, and the drive housing of the compressor, and also controls a suction-side control line between the drive housing and a suction chamber, acted upon by suction pressure of the compressor variably in a throttling and/or shutting-off manner. The control body is driven electromagnetically. To improve the refrigerating capacity and the control behavior of the refrigerating system, the control body, which can shut off both the conveying-side and the suction-side control line, is also driven by means of a pressure cell.

Control valve for a refrigerant compressor and refrigerant compressor

A method for air conditioning a motor vehicle, in which, in a heating mode, the passenger compartment of the motor vehicle is heated via a passenger compartment heat exchanger () through heat pump operation of a refrigerating circuit (). To prevent fogging of the windows of the motor vehicle from the outset, the temperature and humidity in the passenger compartment are recorded by measurement technology, and when the temperature is in a predefined range and the atmospheric humidity reaches a defined threshold, the mass flow of refrigerant in the circuit is throttled upstream of the passenger compartment heat exchanger (), in such a manner that the moisture contained in the air stream passing the passenger compartment heat exchanger () is at least substantially condensed at the passenger compartment heat exchanger (), and the moisture which has already condensed at the heat exchanger () remains at the heat exchanger (). The passenger compartment is heated by a heat source which is outside the circuit () until the temperature in the passenger compartment exceeds an upper limit temperature of the predefined range.

Method for air conditioning a motor vehicle

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.

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Stuttgart, Germany

Roland Caesar