US3561412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus in an engine suction conduit to prevent increase in the fuel-air ratio due to adhered fuel on the conduit walls
Assignee: Honda Motor Co Ltd
•
Filing: 1969-04-04
•
Granted: 1971-02-09
•
Expires: 1989-04-04
Abstract
Abstract A second throttle valve is placed in a suction conduit through which an air fuel mixture passes to the engine cylinders, the second throttle valve being disposed downstream of a manually operated first throttle valve and being connected to a device which is responsive to the suction pressure prevailing in the conduit when the first throttle valve is closed such that the second throttle valve is also closed, there being an air inlet conduit opening into the supply conduit to supply a measured burst of ambient air into the supply conduit downstream of the second throttle valve to compensate for admission to the cylinders of fuel adhering to the walls of the supply conduit whereby the air fuel ratio of the mixture supplied to the cylinders is maintained. Additionally, the first and second throttle valves are coupled together and a spring is interposed between the second throttle valve and the device responsive to the suction pressure in the supply conduit so that when the first throttle valve is opened during acceleration, the second throttle valve is opened therewith against the opposition of the spring irrespective of the pressure prevailing in the supply conduit.
Inventors
- 👤 Shizuo Yagi
- 👤 Akira Ishizuya
- 👤 Tetsuo Sekiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:24
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02M23/08; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0274; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
In an engine having a main conduit for the supply of a fuelair mixture thereto: a first throttle valve movable between open and closed positions for controlling flow of the fuel-air mixture in the conduit, a second throttle valve in said conduit downstream of the first throttle valve, said first throttle valve producing substantial suction pressure in said conduit when closed, means responsive to the suction pressure in said conduit and coupled to the second throttle valve to close the second throttle valve when the first throttle valve is closed, and means responsive to the suction pressure in the conduit to introduce ambient air into the conduit downstream of the second throttle valve when the first throttle valve is closed, said means for introducing ambient air into said conduit comprising means for terminating the introduction of the air shortly after such introduction.
Claim 2
Dependent Claim
142 words
In an engine having a main conduit for the supply of a fuelair mixture thereto: a first throttle valve movable between open and closed positions for controlling flow of the fuel-air mixture in the conduit, a second throttle valve in said conduit downstream of the first throttle valve, said first throttle valve producing substantial suction pressure in said conduit when closed, means responsive to the suction pressure in said conduit and coupled to the second throttle valve to close the second throttle valve when the first throttle valve is closed, and means responsive to the suction pressure in the conduit to introduce ambient air into the conduit downstream of the second throttle valve when the first throttle valve is closed, said means for introducing ambient air into said conduit comprising means for terminating the introduction of the air shortly after such introduction.
Claim 3
Dependent Claim
36 words
In an engine as claimed in claim 1 wherein said means for introducing ambient air into said conduit comprises an air supply conduit, and valve means controlling introduction of ambient air into said air supply conduit.
Claim 4
Dependent Claim
43 words
In an engine as claimed in claim 2 wherein said valve means comprises a connection with said main conduit to enable the valve means to be operated by the suction pressure prevailing in the main conduit when said first throttle valve is closed.
Claim 5
Dependent Claim
146 words
In an engine as claimed in claim 3 wherein said valve means comprises a casing and a diaphragm in said casing dividing the same into first and second chambers, spring means acting on said diaphragm to urge the same in a direction to close said valve means, one of said chambers being coupled with said connection so as to be subjected to the pressure in the main conduit, to open the valve means against the opposition of the spring means, by the suction pressure in the main conduit when the first throttle valve is closed, said means for terminating the introduction of ambient air into the main conduit being constituted by an opening in said diaphragm to provide communication between the chambers and hence equalize the pressure therebetween a short time after said one chamber has been subjected to said suction pressure in the main conduit.
Claim 6
Dependent Claim
42 words
In an engine as claimed in claim 1 comprising means coupling said first and second throttle valves to cause the second throttle valve to be opened concurrently with the first throttle valve irrespective of the suction pressure prevailing in the main conduit.
Claim 7
Dependent Claim
189 words
In an engine having a main conduit for the supply of a fuel-air mixture thereto: a first throttle valve movable between open and closed positions for controlling flow of the fuel-air mixture in the conduit, a second throttle valve in said conduit downstream of the first throttle valve, said first throttle valve producing substantial suction pressure in said conduit when closed, means responsive to the suction pressure in said conduit and coupled to the second throttle valve to close the second throttle valve when the first throttle valve is closed, and means coupling said first and second throttle valves to cause the second throttle valve to be opened concurrently with the first throttle valve irrespective of the suction prEssure prevailing in the main conduit, said means coupling the first and second throttle valves comprising a link connecting said throttle valves, and spring means between said second throttle valve and said means which closes the second throttle valve in response to the suction pressure in said main conduit whereby, when the first throttle valve is opened, the second throttle valve is simultaneously opened against the opposition of said spring means.
Claim 8
Dependent Claim
189 words
In an engine having a main conduit for the supply of a fuel-air mixture thereto: a first throttle valve movable between open and closed positions for controlling flow of the fuel-air mixture in the conduit, a second throttle valve in said conduit downstream of the first throttle valve, said first throttle valve producing substantial suction pressure in said conduit when closed, means responsive to the suction pressure in said conduit and coupled to the second throttle valve to close the second throttle valve when the first throttle valve is closed, and means coupling said first and second throttle valves to cause the second throttle valve to be opened concurrently with the first throttle valve irrespective of the suction prEssure prevailing in the main conduit, said means coupling the first and second throttle valves comprising a link connecting said throttle valves, and spring means between said second throttle valve and said means which closes the second throttle valve in response to the suction pressure in said main conduit whereby, when the first throttle valve is opened, the second throttle valve is simultaneously opened against the opposition of said spring means.
Claim 9
Dependent Claim
121 words
In an engine as claimed in claim 6 wherein said means which closes the second throttle means comprises a casing, a displaceable diaphragm in said casing dividing the same into first and second chambers, means coupling the diaphragm with said second throttle valve to operate the latter in accordance with displacement of the diaphragm, a spring acting on said diaphragm to urge the same in a direction tending to open the second throttle valve, and means connecting one of the chambers with the main conduit to provide communication therebetween such that suction pressure in the main conduit will act in said one chamber and displace the diaphragm against the action of the spring and cause the second throttle valve to close.
Claim 10
Dependent Claim
31 words
In an engine as claimed in claim 7 wherein said second throttle valve has an opening therein providing communication in said main conduit upstream and downstream of the second throttle valve.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |