Measuring and testing – Internal combustion engine or related engine system or... – Compression
Reexamination Certificate
2000-05-30
2001-10-09
Raevis, Robert (Department: 2856)
Measuring and testing
Internal combustion engine or related engine system or...
Compression
Reexamination Certificate
active
06298719
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and a device for measuring the angular distribution of a liquid jet ejected from a spray element, particularly of a fuel jet ejected from a fuel injector.
BACKGROUND INFORMATION
Till now, for measuring the angular distribution of a fuel jet ejected from a fuel injector, the fuel injector was usually arranged above a two-dimensional field of catch containers that are each allocated to only one measuring coordinate and detect a partial spray quantity in a predetermined collecting area around the measuring coordinate. The catch containers are provided, for example, with a graduation, which is read off manually, or each of the catch containers is connected to a separate sensor, which electronically measures the partial spray quantity collected by the catch container. On the side facing the fuel injector, the catch containers are provided with a funnel-shaped enlargement having a, for example, square boundary so that the catch containers can be abuttingly arranged side by side in a matrix-like manner. The measurement of ejected fuel quantities by accumulation in an inspection glass is described, for example, in the introductory description of German Patent No. 195 16 923.
The above-described measuring device and the appertaining measuring method have the disadvantage that a separate catch container having a separate sensor has to be provided for each measuring coordinate. If the intention is to provide a resolution in an equidistant grid of 15 measuring coordinates in the two plane coordinate directions, then the measurement at a total of 225 measuring coordinates is required. This requires 255 catch containers having 225 separate sensors. In this context, it must be considered that the sensors must be calibrated among themselves to make an objective and accurate measurement possible. This requires considerable outlay and places limits on an improved resolution of the measurement.
It is also disadvantageous for the catch containers to be arranged in a plane collecting surface. When working with relatively large spray angles, the lateral offset of the catch containers with respect to the vertical spray direction is relatively large. This relatively large lateral offset limits the measurement of relatively large spray angles. Because of the long spray paths in the case of large spray angles, the measuring results are corrupted, for example, by gravitation and a deceleration of the spray jet by the ambient air. Therefore, the measurement of the angular distribution of the fuel jet in the range of large spray angles using the conventional device and the conventional method is unsatisfactory and inaccurate.
SUMMARY OF THE INVENTION
The method and device according to the present invention have the advantage over conventional methods and devices that the number of catch containers and sensors used is considerably lower than used with the method and the device used heretofore. Moreover, a considerably higher resolution of the measured angular distribution can be attained than with the method and the device used heretofore.
A calibration of the sensors can be dispensed with if, in addition to the required repetition of the measurement for compensating for the fact that a catch container is allocated a plurality of measuring coordinates, the measurement is multiply repeated as many times as sensors are present. In the process, each sensor is allocated a weighting factor, which can be determined on the basis of the redundancy of these additional measurements. If the angular distribution is normalized and the absolute spray quantity is not intended to be ascertained, then one measurement can be dispensed with. Since the sensors are not required to be calibrated, the measurement is simplified considerably and the measuring accuracy is markedly increased.
The catch containers are designed, for example, in a strip-shaped manner, and each include an equal number of measuring coordinates. The individual, strip-shaped catch containers arranged side by side can then be separated from each other by dividing walls, which, for example, have cutouts whose edges lie on a common spherical surface. In this manner, the angular distribution can be measured with high accuracy in a range of large spray angles, as well, which is not possible using the conventional plane measuring device. The partial spray quantities collected by the catch containers can be advantageously measured by a capacitive level measurement. The distances between the dividing walls are adapted, for example, to the partial spray quantities to be expected, the distances between the dividing walls being greater where only low partial spray quantities are attained, for example, in the case of catch containers outwardly arranged.
REFERENCES:
patent: 3459049 (1969-08-01), Kamps
patent: 3678743 (1972-07-01), Maresca et al.
patent: 4873103 (1989-10-01), Cordera
patent: 5753806 (1998-05-01), Ryan et al.
patent: 844230 (1949-07-01), None
patent: 30 45 401 (1982-07-01), None
patent: 37 22 059 (1988-08-01), None
patent: 41 35 580 (1993-05-01), None
patent: 195 16 923 (1996-11-01), None
patent: 0196969 (1949-07-01), None
patent: 59 196969 (1984-11-01), None
patent: 02 130260 (1990-05-01), None
patent: 03 186768 (1991-08-01), None
P. Reimers et al., “Forschungsbericht 101 Bundesanstalt für Materialprüfung (BAM) Berlin Röntgen—und Gammastrahlen Computer-Tomographie,” Feb. 1, 1984, Wirtschaftsverlang NW, Bremerhaven, pp. 2-3.
Schoeffel Eberhard
Seidel Josef
Kenyon & Kenyon
Raevis Robert
Robert & Bosch GmbH
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