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AssigneeRobert Bosch GmbH
InventorsHans Hecht, Gerhard Hueftle, Thomas Lenzing, Manfred Strohrmann, Wolfgang Mueller, Dieter Tank, Holger Krebs, Uwe Konzelmann, Markus Sippel, Horst Kubitz, Henning Marberg
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In devices for measuring the mass of aspirated air of an internal combustion engine, for instance, via a line, it is already known to provide a tubular body inside this line and to provide a temperature-dependent measuring element inside the tubular body. In order that dirt particles and liquid droplets entrained by the aspirated air will be kept away from the measuring element, in accordance with the invention, a protective screen is disposed inside the tubular body, upstream of the measuring element; the screen extends in inclined fashion in the flow direction, and dirt particles and liquid droplets are deposited on it and carried to a downstream end of the protective screen, so that via an outflow opening they can reach the inner conduit wall of the tubular body and be made to bypass the measuring element.
In a device for measuring at least one parameter of a medium flowing in a line, in particular the aspirated air mass of an internal combustion engine, having a tubular body, disposed in a line and experiencing the flow of the medium through it in the flow direction, and having a measuring element bathed by the medium and disposed in a flow passage of the tubular body, the flowing medium in the flow passage having regions of flow, at least one of the regions of flow is in contact with the measuring element, the improvement wherein at least partly upstream of the measuring element (25), a protective screen (28) is disposed inside the flow passage (11) of the tubular body (8) and has screen openings (32) with center lines (41), which when the protective screen (28) is disposed in the tubular body (8) extend in inclined fashion relative to the flow direction (5), so that dirt particles and liquid droplets entrained by the flowing medium are diverted downstream of the protective screen (28) into a region of the flowing medium which does not come in contact with the measuring element (25).
Dependencies are inferred from the claim text.