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US4448064A
Expired / Lapsed
US
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Device for detecting the intake air flow rate in an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1982-05-24
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Granted: 1984-05-15
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Expires: 2002-05-24
Abstract
Abstract An apparatus for measuring the flow rate of intake air into an internal combustion engine is designed such that a conduit mounting ultrasonic sensors can respond quickly to changes in the intake air temperature. In this manner, any modulation of the emitted ultrasonic energy due to temperature effects can be eliminated, such that the device may accurately measure the flow.
Inventors
- 👤 Yoshiaki Asayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:43
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/325; G01F1/3282
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A device for detecting an intake air flow rate in an internal combustion engine, comprising: a casing into which intake air is introduced; a detector for detecting the air flow rate; an air conduit housing said detector; and a partition blocking off a section of said casing and being penetrated on its upstream side by said conduit for bounding upstream and downstream regions of the intake air, said partition being positioned downstream of the air flow detecting portion of said detector.
Claim 2
Independent Claim
81 words
A device for detecting an intake air flow rate in an internal combustion engine, comprising: a casing into which intake air is introduced; a detector for detecting the air flow rate; an air conduit housing said detector; and a partition blocking off a section of said casing and being penetrated on its upstream side by said conduit for bounding upstream and downstream regions of the intake air, said partition being positioned downstream of the air flow detecting portion of said detector.
Claim 3
Dependent Claim
20 words
A device according to claim 1, in which said detector comprises a vortex-shedding flowmeter for ultrasonically detecting von Karman vortices.
Claim 4
Independent Claim
22 words
A device according to claims 1 or 2, in which said casing comprises an air cleaner casing for the internal combustion engine.
Claim 5
Dependent Claim
36 words
A device according to claim 1, wherein the outer surface of said air conduit housing said detector is located in the path of intake air, whereby said conduit rapidly assumes the temperature of said intake air.
Claim 6
Independent Claim
24 words
A device according to claims 1 or 4, an air flow into said casing being substantially perpendicular to an air flow through said detector.
Claim 7
Dependent Claim
17 words
A device according to claim 1, said partition being connected to said detector at one end thereof.
References Cited (Backward Citations)
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Cited
US4083244A
Cited
US4217929A
Cited
JPS5565114A
Cited
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Cited
US4361119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |