Measuring and testing – Volume or rate of flow – Proportional
Patent
1998-04-09
2000-07-11
Patel, Harshad
Measuring and testing
Volume or rate of flow
Proportional
7386122, 731182, 7320421, G01F 500, G01M 1900
Patent
active
060855878
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a device for measuring the mass of a flowing medium. A device has already been disclosed (DE-OS 35 15 206) in which a capture element is provided in the vicinity of a measuring element in a measurement conduit of the device in order to prevent the measuring element from capturing dirt particles present in the air flow. The given accommodation of the capture element in the vicinity of the measuring element produces a leeward area downstream of the capture element, which should prevent the measuring element from capturing dirt particles. Nevertheless, when liquid components are entrained in the air flow, a deposit on the measuring element can be produced, which leads to a disadvantageous alteration of the characteristic curve or the measurement precision of the device.
ADVANTAGES OF THE INVENTION
The device according to the invention for measuring the mass of a flowing medium, has the advantage over the prior art that the measuring element is prevented from capturing in particular liquid components from the air flow so that a uniformly precise measurement result can occur.
Advantageous improvements and updates of the device are possible by means of the measures taken herein. It has turned out that in particular a prismatic embodiment of an interrupting body advantageously produces a particularly effective diversion of liquid components entrained in the air flow. It is of particular advantage that a channel-shaped recess is provided on an end face of the prismatic interrupting body in which the liquid components can collect in order to then drip away in the direction of a wall of the intake line disposed opposite the device, without influencing the device.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is represented in a simplified form in the drawings and will be explained in detail in the description below.
FIG. 1 shows a cross section through an intake line with a device and interrupting body accommodated in it,
FIG. 2 shows a longitudinal section along a line II--II in FIG. 1, through the intake line with the device and interrupting body, and
FIG. 3 shows a top view of the intake line with the interrupting body.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
FIG. 1 shows a cross section of a device identified with 1, which is used to measure the mass of a flowing medium, in particular the intake air mass of internal combustion engines. The internal combustion engine can be a mixture compressing engine with externally supplied ignition, or it can be an air compressing, self-igniting engine. As shown in more detail in FIG. 2, a longitudinal section along a line II--II in FIG. 1, the device 1 preferably has a slim, rod-shaped, block-like form that extends longitudinally in the direction of a plug axis 10, and is inserted, for example so that it can slide, into an opening 6 let into a wall 5 of an intake line 7 that constitutes a flow line. The wall 5 depicted with cross hatching is for example a part of cylindrically embodied intake line 7, through which a medium flows, in particular the air aspirated by the internal combustion engine. The wall 5 of the intake line 7 defines a flow cross section which in the instance of the cylindrical intake line 7 has a circular cross section, in the center of which a center axis 11 extends in the direction 18 of the flowing medium, parallel to the wall 5, and is oriented perpendicular to the slide axis 10. The direction of the flowing medium is indicated in FIGS. 1 and 2 by means of corresponding arrows 18 and runs from left to right there.
The device 1 protrudes into the flowing medium with a part called the measurement part 17 below. In the measurement part 17 of the device 1, a measurement conduit 20 is embodied in which a measuring element 21 is accommodated for measuring the medium flowing in the intake line 7. The design of a device 1 of this kind is sufficiently known by one skilled in the art, for example from DE-OS 44 07 209, whose disclosure should be a component of the current patent applicatio
REFERENCES:
patent: 4437349 (1984-03-01), Joy
patent: 4457169 (1984-07-01), Laubertach et al.
patent: 4478075 (1984-10-01), Oyama et al.
patent: 5476012 (1995-12-01), Takashima
Greigg Edwin E.
Greigg Ronald E.
Patel Harshad
Robert & Bosch GmbH
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