Measuring and testing – Volume or rate of flow – Thermal type
Patent
1989-01-03
1990-07-31
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
049441825
ABSTRACT:
When an air flow rate meter is used in the intake tube of internal combustion engines, such a meter typically having a flat substrate with at least one resistor film disposed on it, the problem arises of dirt deposits on the substrate end face facing into the flow, which cause undesirable changes in the characteristic curve compared with the calibrated new state of the air flow rate meter. The novel embodiment of the air flow rate member is intended to enable calibration based on conditions expected in practice. To produce the effect, while the air flow rate meter is new, of long-term soiling of an air flow rate meter substrate over a period of operation, a leading body, for instance shaped as a U, is disposed on the end face of the substrate facing into the flow. The leading body simulates a soiled effect while the air flow rate meter is still new, and this effect is taken into account in the calibration. The leading body may be of electrically conductive plastic or lacquer and may be connected to a ground line (15). The air flow rate meter is quite generally suitable for measuring flowing media.
REFERENCES:
patent: 3900819 (1975-08-01), Djorup
patent: 4234774 (1987-10-01), Lauterbach
patent: 4273335 (1980-07-01), Peter et al.
patent: 4300391 (1981-11-01), Eiermann
patent: 4833912 (1985-05-01), Ohta et al.
Gneiss Heinz
Kienzle Wolfgang
Sauer Rudolf
Wuensch Werner
Goldstein Herbert
Greigg Edwin E.
Robert & Bosch GmbH
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