Patent US3835825A successfully refreshed from Google Patents.
US3835825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines
Assignee: Federal Mogul Coventry Ltd
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Filing: 1972-05-26
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Granted: 1974-09-17
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Expires: 1992-05-26
Abstract
Abstract An internal combustion engine is provided with valve means for admitting air to the engine inlet manifold downstream of the throttle valve, and the valve means is operative to pass air to the inlet manifold under engine over-run conditions when the throttle valve is closed, the supply of fuel is cut-off and the engine speed is substantially above idling speed. There is also described a fuel injection system having a plurality of fuel injection valves arranged to supply fuel to an engine and including means which are operative, after the supply of fuel has been cut-off during engine over-run conditions, to deliver fuel to the engine via a plurality of the fuel injection valves simultaneously.
Inventors
- 👤 A Baxendale
- 👤 E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:44
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3005; F02D41/0002; F02D41/0005; F02D41/02; F02D41/04; F02D41/12; F02D41/123; F02D41/126; F02M; F02M23/00; F02M23/04; F02M23/06; F02M51/00; F02M51/02; F02M69/00; F02M69/30; F02M69/32; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A fuel injection system for an internal combustion engine which includes a plurality of groups of fuel injection valves, a separate pulse generator connected to each group of valves to control the operation thereof, a control circuit connected to the pulse generators to provide a signal inhibiting the operation of or output from the generators during engine over-run conditions and a further pulse generator connected to all the groups of injection valves to cause their simultaneous operation for a predetermined period upon the termination of engine over-run conditions.
Claim 2
Dependent Claim
88 words
A fuel injection system for an internal combustion engine which includes a plurality of groups of fuel injection valves, a separate pulse generator connected to each group of valves to control the operation thereof, a control circuit connected to the pulse generators to provide a signal inhibiting the operation of or output from the generators during engine over-run conditions and a further pulse generator connected to all the groups of injection valves to cause their simultaneous operation for a predetermined period upon the termination of engine over-run conditions.
Claim 3
Dependent Claim
33 words
A system as claimed in claim 1, including a trigger device producing trigger pulses at a repetition rate proportional to engine speed which are fed to trigger each of the separate pulse generators.
Claim 4
Dependent Claim
79 words
A system as claimed in claim 2, wherein the control circuit is fed with trigger pulses proportional to engine speed and comprises a diode pump circuit producing a D.C. voltage proportional to engine speed, said D.C. voltage being fed through a throttle switch, which is closed only when the engine throttle is closed, to a Schmitt trigger circuit producing an output operating a transistor switch to inhibit the output from each of the separate pulse generators under over-run conditions.
References Cited (Backward Citations)
US3705572A
Cited
US3661126A
Cited
US3570460A
Cited
US3690305A
Cited
US3703162A
Cited
US3735742A
Cited
US3727591A
Cited
US3747575A
Cited
US3742920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |