Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
1998-10-13
2001-01-23
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
06176131
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on a device for measuring the mass of a flowing medium. A device of this kind has already been disclosed (DE-OS 195 24 634), having a plate-shaped sensor element accommodated in a recess of a sensor support, and having a sensor region with at least one measurement resistor that is exposed to the flowing medium. The sensor element is partially glued in the recess by means of adhesive and has a contacting region for connection to the at least one active measurement region of the sensor element, and connecting lines lead from this contacting region to an evaluation circuit. The sensor element is mounted in the recess, essentially flush to the wall, in order to obtain a flow at the sensor element without flow separations. Between the sensor element and the walls of the recess, there is a manufacture-conditional gap that cannot be totally prevented for tolerance reasons. Furthermore, the electronic elements of the evaluation circuit as well as the connecting lines to the contacting region of the sensor element must be protected against moisture of the kind that can occur in the operation of the device in a motor vehicle.
OBJECT AND SUMMARY OF THE INVENTION
The device according to the invention has the advantage over the prior art of an improved moisture protection of the evaluation circuit components as well as the connecting lines to the contacting region of the sensor element. Enlargements of a gap that runs between the sensor element and the walls of the recess are particularly advantageous in order to reliably stop a continuous flow in the gap of a protective layer applied at least partially to the evaluation circuit so that the flow path of the protective layer always remains clearly defined.
A dividing wall provided between the evaluation circuit and the sensor element is particularly advantageous and in connection with a covering, this dividing wall permits the reliable protection of components of the evaluation circuit from external influences, wherein an improved flow guidance at the sensor element is additionally achieved. In an advantageous improvement of the invention, the protective layer can also be the adhesive that is used to glue the sensor element in the recess. It is furthermore advantageous that the gap enlargements can be provided without a separate additional cost when manufacturing the sensor support.
The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings.
REFERENCES:
patent: 5396795 (1995-03-01), Araki
patent: 5631416 (1997-05-01), Rilling et al.
patent: 5723784 (1998-03-01), Lembke et al.
patent: 42 41 333 A1 (1993-06-01), None
patent: 42 19 454 A1 (1993-12-01), None
patent: 195 24 634 A1 (1997-01-01), None
Breakthrough in Reverse Flow Detection—A New Mass Air Flow Meter Using Micron Silicon Technology, SAE Technical Paper Series, 950433, Feb. 1995.
Hecht Hans
Konzelmann Uwe
Kromer Alexander
Marberg Henning
Greigg Edwin E.
Greigg Ronald E.
Patel Harshad
Robert & Bosch GmbH
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