US4084562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel metering device
Assignee: Robert Bosch GmbH
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Filing: 1975-07-16
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Granted: 1978-04-18
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Expires: 1995-07-16
Abstract
Abstract A fuel metering device for low fuel feed pressures is described which is adapted for use in an externally ignited internal combustion engine of the air/fuel mixture-compressing type having an air-intake suction tube, and which comprises (a) conduit means for conveying fuel to the suction tube of the engine, (b) throttle means of determinable cross-sectional throttle area disposed in the conduit means, (c) bypass duct means for bypassing the throttle means, and (d) control means for switching the bypass means into the fuel flow through the conduit means to bypass the aforesaid throttle means, thereby varying the ratio of the amounts of fuel and air in the mixture being formed in the suction pipe; the control means are responsive to characteristic engine data.
Inventors
- 👤 Konrad Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/12; F02M7/18; F02M7/20; F02M7/133; Y; Y10; Y10S; Y10S261/00; Y10S261/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A fuel metering device for low fuel feed pressures and adapted for use in an externally ignited internal combustion engine of the air/fuel mixture-compressing type, having an air-intake suction tube, which device comprises: (a) conduit means for conveying fuel to the said suction tube of the engine, (b) throttle means of determinable cross-sectional throttle area disposed in said conduit means, (c) bypass duct means for bypassing said throttle means, and (d) electrical control means responsive to characteristic engine data for switching said bypass means into the fuel flow through said conduit means to bypass said throttle means, thereby varying the ratio of the amounts of fuel and air in the mixture being formed in said suction pipe, wherein said electrical control means is adapted to a work cycle and switches in said bypass means intermittently in dependence on the work cycle, the frequency of which corresponds to the suction frequency of the engine.
Claim 2
Dependent Claim
153 words
A fuel metering device for low fuel feed pressures and adapted for use in an externally ignited internal combustion engine of the air/fuel mixture-compressing type, having an air-intake suction tube, which device comprises: (a) conduit means for conveying fuel to the said suction tube of the engine, (b) throttle means of determinable cross-sectional throttle area disposed in said conduit means, (c) bypass duct means for bypassing said throttle means, and (d) electrical control means responsive to characteristic engine data for switching said bypass means into the fuel flow through said conduit means to bypass said throttle means, thereby varying the ratio of the amounts of fuel and air in the mixture being formed in said suction pipe, wherein said electrical control means is adapted to a work cycle and switches in said bypass means intermittently in dependence on the work cycle, the frequency of which corresponds to the suction frequency of the engine.
Claim 3
Dependent Claim
23 words
A fuel metering device as described in claim 1, wherein said bypass means comprise at least one bypass duct containing a throttle passage.
Claim 4
Dependent Claim
18 words
A fuel metering device as described in claim 1, wherein said electric control means comprise a solenoid valve.
Claim 5
Dependent Claim
19 words
A fuel metering device as described in claim 3, wherein said solenoid valve is in open position when de-energized.
Claim 6
Dependent Claim
96 words
A fuel metering device as described in claim 1, wherein said conduit means comprise two conduits adapted for connection to the suction pipe of the engine, wherein said bypass means includes two conduits each connected to a respective one of the conduits of said conduit means and to said electrical control means, wherein said throttle means comprise a throttle passage in each of the conduits of said conduit means, and wherein said electrical control means comprises a single valve controlling said two conduits of said conduit means in common via two conduits of said bypass means.
Claim 7
Dependent Claim
35 words
A fuel metering device as described in claim 1, further comprising fuel metering nozzle means disposed in said conduit means downstream of said throttle means where said bypass duct means reunite with said conduit means.
Claim 8
Dependent Claim
21 words
A fuel metering device as described in claim 6, further comprising nozzle control means associated with said fuel metering nozzle means.
Claim 9
Dependent Claim
33 words
A fuel metering device as described in claim 7, wherein said nozzle control means are of the Stromberg type and comprise a valve needle controlling the internal cross-sectional area of said nozzle means.
Claim 10
Dependent Claim
52 words
A fuel metering device as described in claim 7, wherein said throttle means of said conduit means are located in the latter in a position where the cross-sectional area of the throttle passage thereof can be controlled by said nozzle control means together with the internal cross-sectional area of said nozzle means.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |