US3736912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for compensation of the operation of a negative pressure control type fuel injection apparatus
Assignee: Honda Motor Co Ltd
•
Filing: 1971-09-30
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Granted: 1973-06-05
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Expires: 1991-09-30
Abstract
Abstract An apparatus of the type in which the amount of fuel injected to an internal combustion engine is controlled by a control member arranged to be moved with a front wall urged forwardly by a return spring and rearwardly by negative pressure in a negative pressure chamber connected to an air intake passage of the internal combustion engine. A second negative pressure chamber is provided behind the foregoing negative pressure chamber and the foregoing return spring is supported by a second front wall, which is urged forward by a second return spring in the second negative pressure chamber, the interior of the second negative pressure chamber being selectively connected to the atmosphere and the air intake passage of the engine through a change-over valve.
Inventors
- 👤 T Okura
- 👤 K Miyaki
- 👤 S Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
F; F02; F02D; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0261; F02D2700/0266
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
In apparatus for the control of the amount of fuel injection to an internal combustion engine by the displacement of a control member under the action of a diaphragm wall subjected to the negative pressure in an air intake passage leading to the engine and a return spring, an improvement comprising displacEable means supporting the return spring, and means for moving said displaceable means in response to change in atmospheric pressure to vary the effect of the action of the return spring on the diaphragm wall, said displaceable means including a movable wall against which the return spring bears, said means for moving the displaceable means comprising a negative pressure chamber in communication with said movable wall, and means for selectively connecting said negative pressure chamber to the air intake passage and to atmosphere.
Claim 2
Dependent Claim
134 words
In apparatus for the control of the amount of fuel injection to an internal combustion engine by the displacement of a control member under the action of a diaphragm wall subjected to the negative pressure in an air intake passage leading to the engine and a return spring, an improvement comprising displacEable means supporting the return spring, and means for moving said displaceable means in response to change in atmospheric pressure to vary the effect of the action of the return spring on the diaphragm wall, said displaceable means including a movable wall against which the return spring bears, said means for moving the displaceable means comprising a negative pressure chamber in communication with said movable wall, and means for selectively connecting said negative pressure chamber to the air intake passage and to atmosphere.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1 wherein the means for selectively connecting the negative pressure chamber to the air intake passage and to atmosphere comprises a change-over valve.
Claim 4
Dependent Claim
19 words
Apparatus as claimed in claim 2 comprising a check valve between the change-over valve and the air intake passage.
Claim 5
Dependent Claim
79 words
Apparatus as claimed in claim 2 wherein said means for selectively connecting the negative pressure chamber to the air intake passage and to atmosphere further comprises a pressure-sensitive means responsive to atmospheric pressure and coupled to the change-over valve for moving the same from a first position in which the change-over valve connects the negative pressure chamber to the air intake passage to a second position in which the change-over valve connects the negative pressure chamber to the atmosphere.
Claim 6
Dependent Claim
45 words
Apparatus as claimed in claim 4 wherein said pressure sensitive means comprises a solenoid acting on the change-over valve, a switch controlling energization of the solenoid and a detector sensitive to atmospheric pressure reduction and coupled to the switch to control opening and closing thereof.
Claim 7
Dependent Claim
38 words
Apparatus as claimed in claim 2 comprising a second return spring acting on said movable wall to urge the same to a forward position tending to intensify the action of the first return spring on the diaphragm wall.
Claim 8
Dependent Claim
26 words
Apparatus as claimed in claim 6 comprising means acting in concert with the second return spring to reduce the strength required for said second return spring.
Claim 9
Dependent Claim
74 words
Apparatus as claimed in claim 7 wherein the means acting in concert with the second return spring comprises a second negative pressure chamber in communication with the movable wall on a side thereof opposite the first negative pressure chamber, a second change-over valve selectively connecting the second chamber with the atmosphere and the intake passage, and means connecting the two change-over valves for operation of the first and second chambers in reverse phase relation.
Claim 10
Dependent Claim
18 words
Apparatus as claimed in claim 8 wherein said second chamber is at the periphery of the first chamber.
References Cited (Backward Citations)
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US2876755A
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US3064636A
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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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |