US4369650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable air flow sensor arrangement
Assignee: Nissan Motor Co Ltd
•
Filing: 1980-11-21
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Granted: 1983-01-25
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Expires: 2000-11-21
Abstract
Abstract A Karman type air flow sensor element is disposed within a duct slidably mounted between members defining an annular space. The annular space causes the intake air to increase its velocity as it approaches the inner periphery of the annular space thus creating a pressure differential zone. By moving the duct so that the inlet and outlet are exposed to different high and low pressures respectively the pressure differential across said the inlet and outlet of the duct can be controlled to vary the fraction of the total intake air inducted therethrough.
Inventors
- 👤 Tadahiro Yamamoto
- 👤 Kenji Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:06
CPC Classifications
G; G01; G01F; G01F5/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
In an internal combustion engine having a combustion chamber and an induction passage leading from the ambient atmosphere to said combustion chamber, an air flow sensor comprising: a duct in said induction passage, said duct having an inlet and an outlet and through which flows a fraction of the total intake air received via said induction passage; flow velocity increasing means for locally increasing the rate of flow of the air passing through said induction passage to create a pressure gradient zone; and an adjusting device for varying the fraction of the total intake air permitted to flow through said duct, said adjusting device including a mechanism for moving said duct within said pressure gradient zone to vary the pressure differential across the inlet and outlet of said duct.
Claim 2
Dependent Claim
129 words
In an internal combustion engine having a combustion chamber and an induction passage leading from the ambient atmosphere to said combustion chamber, an air flow sensor comprising: a duct in said induction passage, said duct having an inlet and an outlet and through which flows a fraction of the total intake air received via said induction passage; flow velocity increasing means for locally increasing the rate of flow of the air passing through said induction passage to create a pressure gradient zone; and an adjusting device for varying the fraction of the total intake air permitted to flow through said duct, said adjusting device including a mechanism for moving said duct within said pressure gradient zone to vary the pressure differential across the inlet and outlet of said duct.
Claim 3
Dependent Claim
63 words
An air flow sensor as claimed in claim 1 wherein said flow velocity increasing means takes the form of first and second members which define an annular space therebetween; and said mechanism for moving said duct includes means for slidingly supporting said duct in said annular space; and an adjust screw operatively interconnecting said duct and one of said first and second members.
Claim 4
Dependent Claim
33 words
An air flow sensor as claimed in claim 1 or 2 further comprising a carburetor equipped with a fuel injector which is controlled in response to the output of said air flow sensor.
Claim 5
Dependent Claim
40 words
An air flow sensor as claimed in claim 3 wherein said air flow sensor is disposed in an air cleaner mounted on said carburetor and wherein said first and second members serve to mount the lid of the air cleaner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |