Measuring and testing – Simulating operating condition – Marine
Patent
1997-06-25
1999-07-20
Patel, Harshad
Measuring and testing
Simulating operating condition
Marine
732025, 7320422, G01M 1900, G01F 168
Patent
active
059258209
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a device for measuring the mass of a flowing medium. A device is already known (German Offenlegungsschrift 44 07 209) that is intended for measuring the mass of air aspirated by an internal combustion engine and to that end has a measuring element accommodated in a measuring conduit. The measuring element is embodied for instance in the form of a ceramic substrate or as a micromechanical component. The device has a slender, elongated, parallelepiped shape extending radially in the direction of an insertion axis and is introduced into an opening of a wall of an intake line. The wall of the intake line defines a flow cross section, which in the case of a cylindrical intake line is approximately circular. By way of example, the intake line is an intake tube of an internal combustion engine, through which the engine can aspirate air from the environment. The device is fixed in its radial position in the opening of the wall of the intake line in such a way that the measuring conduit of the measuring part of the device is oriented parallel to the medium flowing in the intake line. In the radial direction, the measuring part of the device preferably protrudes approximately to the middle of the flow cross section of the intake line. For mounting and radially fixing the position of the device on the intake line, openings are provided, for instance in a part of the device housing located outside the intake line, and screws can be introduced into these openings to connect the device to the intake line.
In mass production of the device or mass-production mounting of it on the intake line, however, installation tolerances are unavoidable, and as a result the measuring conduit of the measuring part of the device is not always aligned exactly parallel with the medium flowing in the intake line but instead can deviate somewhat from that orientation. A deviation from the intended parallel installed position of the measuring conduit, however, can lead to unstable flow conditions at the measuring part or in the measuring conduit, which are characterized by a switchover of the flow from laminar to turbulent, for instance, and as a result more or less major variations in the characteristic curves of the mounted devices can occur.
ADVANTAGES OF THE INVENTION
The device according to the invention for measuring the mass of a flowing, has the advantage over the prior art that variations in the characteristic curves resulting from installation tolerances are markedly reduced, so that in mass production or mounting of the device, essentially constant characteristic curves without variations can be expected.
By the provisions recited herein advantageous further features of and improvements to the device are possible.
BRIEF DESCRIPTION OF THE DRAWING
One exemplary embodiment of the invention is shown in simplified form in the drawing and described in further detail in the ensuing description.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The drawing in a sectional view shows part of a device 1 that serves to measure the mass of a flowing medium, especially the mass of air aspirated by internal combustion engines. The complete structure of such a device can be learned from German Offenlegungsschrift 44 07 209, for instance, whose disclosure is hereby incorporated by reference. The device 1 preferably has a slender, elongated parallelepiped form extending radially in the direction of an insertion axis 10. The insertion axis 10 is represented in the drawing by a dot and extends into the plane of the drawing, vertically to the plane of the drawing. The device 1 is introduced in a known manner into an opening made in a wall 2 of an intake line 4 and is secured to the intake line 4, for instance by a screw connection. By way of example, the intake line 4 is an intake tube of a mixture-compressing internal combustion engine with externally supplied ignition, through which tube the engine can aspirate air from the environment. The intake line 4 defines a flow cross section, which in the case of a cylind
REFERENCES:
patent: 4942763 (1990-07-01), Harpster
patent: 4955230 (1990-09-01), Hall
patent: 4981035 (1991-01-01), Hall
patent: 5024083 (1991-06-01), Inada et al.
patent: 5086650 (1992-02-01), Harrington et al.
patent: 5467648 (1995-11-01), Igarashi et al.
Konzelmann Uwe
Tank Dieter
Greigg Edwin E.
Greigg Ronald E.
Patel Harshad
Robert & Bosch GmbH
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