US3667494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass air flow measuring means
Assignee: Individual
•
Filing: 1970-08-11
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Granted: 1972-06-06
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Expires: 1990-08-11
Abstract
Abstract A mass air flow sensitive fuel control for controlling fuel to a multiple cylinder internal combustion engine wherein the fuel control apparatus includes mass air flow sensing means such as a high gain venturi disposed in the air induction passage for measuring the mass air flow to a single engine cylinder and a fuel control valve actuated as a function of the venturi air pressure output for controlling fuel flow to all of the engine cylinders as a function of the mass air flow to the one engine cylinder.
Inventors
- 👤 Elmer A Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:35
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/16; F02M69/18; F02M69/20; F02M1/00; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
Mass air flow measuring means comprising: first venturi means including a first converging entrance section and a first diverging discharge section connected by a first throat section defined by a generally circular inner body portion and a spaced apart annular outer portion concentric therewith; second venturi means including a second converging entrance section and a second diverging discharge section connected by a second throat portion formed in said inner body portion; conduit means connecting said second discharge section with said first throat portion to thereby provide a reduced back pressure against the air flow through said second venturi which, in turn, results in a correspondingly relatively large pressure differential between venturi impact and throat air pressures derived from said second venturi means for a given total mass air flow through said first and second venturi means; pressure responsive means responsive to said air pressure differential and operative to produce an output signal representative thereof and thus mass air flow through said first and second venturi means.
Claim 2
Dependent Claim
166 words
Mass air flow measuring means comprising: first venturi means including a first converging entrance section and a first diverging discharge section connected by a first throat section defined by a generally circular inner body portion and a spaced apart annular outer portion concentric therewith; second venturi means including a second converging entrance section and a second diverging discharge section connected by a second throat portion formed in said inner body portion; conduit means connecting said second discharge section with said first throat portion to thereby provide a reduced back pressure against the air flow through said second venturi which, in turn, results in a correspondingly relatively large pressure differential between venturi impact and throat air pressures derived from said second venturi means for a given total mass air flow through said first and second venturi means; pressure responsive means responsive to said air pressure differential and operative to produce an output signal representative thereof and thus mass air flow through said first and second venturi means.
Claim 3
Dependent Claim
58 words
Mass air flow measuring means as claimed in claim 1 wherein: said first section is provided with a circumferentially extending stepped portion; and said conduit means includes a slot formed in said circular inner body and extending radially therethrough to communicate said second discharge section with said first throat section on the downstream side of said stepped portion.
Claim 4
Dependent Claim
22 words
Mass air flow measuring means as claimed in claim 2 wherein: said slot is arcuate and substantially coextensive with said stepped portion.
Claim 5
Dependent Claim
37 words
Mass air flow measuring means as claimed in claim 1 wherein: said inner body portion is provided with a radially extending strut portIon adapted to bear against said annular outer portion and secured thereto by fastening means.
Claim 6
Dependent Claim
32 words
Mass air flow measuring means as claimed in claim 1 wherein: said first throat section is substantially annular; and said second throat portion is circular and concentric with said first throat portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |