Claims
- 1. In an apparatus for measuring the mass of a flowing medium, which includes a flow conduit for the medium which has a restricted section, a bypass line which has a mouth connected to said restricted section and through which a proportionate mass of the medium flows which is at a predetermined proportion with respect to a mass of the medium flowing through the flow conduit and said proportionate mass of the medium discharges from said mouth into said restricted section, at least one temperature-dependent resistor disposed in the bypass line, and a regulating means for regulating the temperature and/or resistance of the at least one temperature-dependent resistor, in accordance with the flowing mass of medium wherein a control variable of the at least one temperature-dependent resistor, is a standard for the flowing mass of medium, the improvement wherein said restricted section includes first and second portions of said flow conduit for said medium with said second portion downstream of said first portion, said first portion having a narrower cross section than said second portion such that said first portion of said restricted section of the flow conduit for the medium is embodied such that the flow cross section of the medium in the flow direction in said first portion of said restricted section is smaller up to the mouth of the bypass line than said second portion and said second portion beginning at the mouth of the bypass line is wider than said first portion by an amount which corresponds to the bypass line cross section at the mouth of said bypass, and wherein the medium flow conduit is embodied such that said second portion downstream of said first portion forms a stepped widening of the flow cross section.
- 2. An apparatus as defined by claim 1, wherein the apparatus is an apparatus for measuring the aspirated air mass in an internal combustion engine.
- 3. An apparatus as defined in claim 1, in which said bypass line includes a section which converges toward its mouth, and said medium flow conduit includes a step-like enlargement downstream of said converging section of said bypass line.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3130626 |
Aug 1981 |
DEX |
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Parent Case Info
This application is a division of application Ser. No. 395,876, filed July 7, 1982 now U.S. Pat. No. 4,468,957.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3559482 |
Baker et al. |
Feb 1971 |
|
4393697 |
Sato et al. |
Jul 1983 |
|
4395907 |
Morita et al. |
Aug 1983 |
|
4400974 |
Nashimura et al. |
Aug 1983 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
395876 |
Jul 1982 |
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