DEVICE FOR FILLING VEHICLE AIR CONDITIONING SYSTEMS WITH COOLANT R744

Abstract

The invention relates to a device for filling vehicle air conditioning systems with refrigerant R744 in such a manner that it allows the calculation of mass deviations in line sections during filling with the refrigerant R744. An adapter hose assembly is configured such that it is segmented, wherein segmentation takes place by inserting several pairs of respectively separate temperature and pressure sensors for determining the respective density of the refrigerant in the adapter hose assembly. The device comprises a mass calculator for controlling the filling valve in accordance with a central correction calculation based on different density deviations determined using the pairs of respectively separate temperature and pressure sensors and also using the parameters of the mass measurement provided by the mass flow meter.

Claims

1. A device for filling vehicle air conditioning systems with refrigerant R744, wherein the device comprises a filling system with pumps, lines, and storage tanks, an adapter hose assembly as the filling section, an adapter with a filling valve and a mass measuring system at the beginning of the filling section, wherein one temperature and pressure sensor respectively is disposed at the beginning and end of the filling section to determine the density of the refrigerant, and wherein a control system is associated with the device, wherein the adapter hose assembly is configured such that it is segmented, wherein segmentation takes place by inserting several pairs of respectively separate temperature and pressure sensors for determining the respective density of the refrigerant in the adapter hose assembly, wherein the device comprises a mass calculator for controlling the filling valve in accordance with a central correction calculation based on different density deviations determined using the pairs of respectively separate temperature and pressure sensors and also using the parameters of the mass measurement provided by the mass flow meter.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0014] An embodiment of the invention is described in greater detail below with reference to the drawing. Wherein:

[0015] FIG. 1 shows the basic structure of a filling section for the refrigerant R744 (prior art)

[0016] FIG. 2 shows a modified filling section for the refrigerant R744 in which a temperature and pressure sensor is inserted at the beginning and end of the filling line (prior art)

[0017] FIG. 3 shows the basic structure of a device with refrigerant R744 according to the invention for filling

DETAILED DESCRIPTION

[0018] FIG. 1 and FIG. 2 show filling sections according to the state of the art described above, whose main assemblies include a hydraulic cabinet 1 with pumps, lines, and storage tank, a mass measuring system 2, an adapter hose assembly 3, an adapter 4 with filling valve 8, temperature and pressure sensors 5a or 5b, respectively, and a control system 7.

[0019] FIG. 3 shows filling section designed according to the invention for refrigerant R744. Likewise, a hydraulic cabinet 1 with pumps, lines, storage tank, a mass measuring system 2, an adapter hose assembly 3, and an adapter 4 with a filling valve 8 are provided as known from prior art. A temperature and pressure sensor 5a and 5b, respectively, is placed at the beginning and end of the adapter hose assembly 3; in addition, a control system 7 is associated with the device.

[0020] In the present context, it is essential that the adapter hose assembly 3 can have a segmented configuration and be split. This segmentation is designed based on functional aspects, preferably on aspects of handling. Respectively separate pairs of temperature and pressure sensors 6 are assigned to individual segments of the adapter hose assembly 3. These pairs of temperature and pressure sensors 6, whose number can be increased or decreased, allow calculation of density deviations in each line segment of the adapter hose assembly 3.

[0021] All measured data is captured and processed in real time by a mass calculator 9. Control of the filling valve 8, which depends on the correction calculation due to different density deviations and the mass measurement at the inlet of the section, is assumed by the mass calculator 9. An interface with the control system 7 allows handing over of process parameters such as the mass to be filled and handing over of results achieved.

LIST OF REFERENCE SYMBOLS

[0022] 1 Hydraulic cabinet/R744 filling system [0023] 2 Mass measuring system [0024] 3 Adapter hose assembly [0025] 4 Adapter [0026] 5a Temperature and pressure sensor at the beginning of the filling section [0027] 5b Temperature and pressure sensor at the end of the filling section [0028] 6 Pairs of temperature and pressure sensors at the segments of the filling section [0029] 7 Control system of the filling system [0030] 8 Filling valve [0031] 9 Mass calculator