Patent US4249505A successfully refreshed from Google Patents.
US4249505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation system for quantity of intake air for an internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1979-05-29
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Granted: 1981-02-10
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Expires: 1999-05-29
Abstract
Abstract A system for controlling the quantity of intake air for an internal combustion engine in response to changes in air density employs a supplementary air intake passage connecting the main air intake passage on the downstream side of the carburetor throttle valve with the atmosphere. An atmospheric pressure compensation valve controls the open cross-sectional area of the supplementary air passage in response to changes in atmospheric pressure. In addition, a vacuum responsive control valve controls the open cross-sectional area of the supplementary air intake passage to pass an amount of air through the supplementary passage proportional to the amount of air passed through the main air intake passage.
Inventors
- 👤 Hiroyuki Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02M23/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
Apparatus for controlling the quantity of intake air for an internal combustion engine comprising: (a) a main air intake passage equipped with a carburetor having a throttle valve; (b) a supplementary air intake passage connecting the main air intake passage on the downstream side of the throttle valve with the atmosphere; (c) atmospheric pressure correction means in the supplementary air intake passage for varying the open cross-sectional area of the supplementary air passage in response to changes in atmospheric pressure; and (d) means for controlling the open cross-sectional area of the supplementary air intake passage so as to pass an amount of air through the supplementary air intake passage proportional to the amount of air passed through the main air intake passage.
Claim 2
Dependent Claim
122 words
Apparatus for controlling the quantity of intake air for an internal combustion engine comprising: (a) a main air intake passage equipped with a carburetor having a throttle valve; (b) a supplementary air intake passage connecting the main air intake passage on the downstream side of the throttle valve with the atmosphere; (c) atmospheric pressure correction means in the supplementary air intake passage for varying the open cross-sectional area of the supplementary air passage in response to changes in atmospheric pressure; and (d) means for controlling the open cross-sectional area of the supplementary air intake passage so as to pass an amount of air through the supplementary air intake passage proportional to the amount of air passed through the main air intake passage.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1 in which the means for controlling the open cross-sectional area of the supplementary air intake passage comprises a first vacuum responsive control valve in the supplementary air intake passage.
Claim 4
Dependent Claim
80 words
The apparatus of claim 2 wherein the first vacuum control valve comprises a vacuum chamber which is connected by a connecting passage to the main air intake passage, and the means for controlling the open cross-sectional area of the supplementary air intake passage includes a second vacuum responsive control in the connecting passage for controlling the vacuum in the vacuum chamber of the first control valve in proportion to the amount of air passed through the main air intake passage.
Claim 5
Dependent Claim
96 words
The apparatus of claim 3 wherein the second vacuum control valve comprises first and second vacuum chambers separated from each other by a diaphragm, wherein the first vacuum chamber is connected to the supplementary air intake passage on the upstream side of the first control valve and the second vacuum chamber is connected both to the venturi of the carburetor and the vacuum chamber of the first control valve, wherein the connection between the second vacuum chamber and the vacuum chamber of the first control valve is capable of being opened and closed by the diaphragm.
Claim 6
Dependent Claim
61 words
The apparatus of claim 4 wherein the main air intake passage is provided, on the downstream side of the throttle valve, with a second supplementary air intake passage, the second supplementary air intake passage being equipped with a third vacuum responsive control valve, the chamber of the third control valve being connected to the vacuum chamber of the first control valve.
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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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |