Patent US3742918A successfully refreshed from Google Patents.
US3742918A
Expired / Lapsed
US
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Electronically controlled fuel-supply system for compression-ignition engine
Assignee: Société Industrielle d'Electronique et d'Informatique
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Filing: 1970-05-13
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Granted: 1973-07-03
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Expires: 1990-05-13
Abstract
Abstract One or more cylinders of a compression-ignition engine are connected to respective supply conduits through control valves normally spring-biased into a closed position. A feed pump periodically delivers fuel under pressure, from a reservoir, to a distributing channel leading to the supply conduit or conduits, this channel also having a return conduit for each cylinder with a bypass valve closed during all or part of the compression stroke of the pump. The closure of this bypass valve, during a gating interval established by an electronic network, causes a pressure buildup in the supply conduit sufficient to open the control valve against the force of its loading spring so that fuel under pressure enters the injector throughout the gating interval whose timing and duration may be determined by one or more operating parameters, such as throttle position and engine speed, fed into the network.
Inventors
- 👤 F Murtin
- 👤 L Mercier
- 👤 J Barat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:45
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/36; F02D41/365; F02D41/38; F02D41/40; F02M51/00; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
265 words
A system for controlling the fuel supply to a compressionignition engine having at least one piston cylinder provided with a fuel injector, comprising: a source of fuel for said engine; a distributing channel provided with a first extension conduit terminating at said injector and with a second extension conduit leading to a drain for excess fuel; pump means disposed between said source and said channel for delivering fuel at high pressure to said channel; first valve means in said first conduit provided with biasing means normally maintaining same in a closed position; electrically controlled second valve means in said second conduit for intermittently blocking the path from said channel to said drain; and electronic gating means for periodically closing said second valve means during recurrent operating cycles of the engine with simultaneous opening of said first valve means against the force of said biasing means, said gating means including a first pulse generator controlled by the engine for establishing a first period beginning at a predetermined point in a cycle, a second pulse generator controlled by said first pulse generator for establishing a second period beginning with the end of said first period, a first circuit responsive to a first operating parameter of the engine and connected to said first pulse generator for varying the length of said first period, and a second circuit responsive to a second operating parameter of the engine and connected to said second pulse generator for varying the length of said second period, said second valve means being closable by said gate means for the duration of said second period.
Claim 2
Independent Claim
265 words
A system for controlling the fuel supply to a compressionignition engine having at least one piston cylinder provided with a fuel injector, comprising: a source of fuel for said engine; a distributing channel provided with a first extension conduit terminating at said injector and with a second extension conduit leading to a drain for excess fuel; pump means disposed between said source and said channel for delivering fuel at high pressure to said channel; first valve means in said first conduit provided with biasing means normally maintaining same in a closed position; electrically controlled second valve means in said second conduit for intermittently blocking the path from said channel to said drain; and electronic gating means for periodically closing said second valve means during recurrent operating cycles of the engine with simultaneous opening of said first valve means against the force of said biasing means, said gating means including a first pulse generator controlled by the engine for establishing a first period beginning at a predetermined point in a cycle, a second pulse generator controlled by said first pulse generator for establishing a second period beginning with the end of said first period, a first circuit responsive to a first operating parameter of the engine and connected to said first pulse generator for varying the length of said first period, and a second circuit responsive to a second operating parameter of the engine and connected to said second pulse generator for varying the length of said second period, said second valve means being closable by said gate means for the duration of said second period.
Claim 3
Dependent Claim
65 words
A system as defined in claim 1 wherein said pump means comprises a reciprocable pump piston for performing a succession of compression strokes timed to span an injection interval established by the opening of said first valve means and closure of said second valve means, said pump piston being coupled with the engine for correlating said compression strokes with the timing of said first period.
Claim 4
Dependent Claim
31 words
A system as defined in claim 1 wherein said first circuit includes a generator of speed-dependent analog voltage, said second circuit including a generator of analog controlled by an accelerator pedal.
Claim 5
Dependent Claim
23 words
A system as defined in claim 1 wherein said first circuit includes a mass-flow meter disposed in an air intake of said cylinder.
Claim 6
Dependent Claim
38 words
A system as defined in claim 1 wherein said gating means further includes a control circuit for selectively placing said second valve means under the exclusive control of said first pulse generator for closure during said first period.
Claim 7
Independent Claim
233 words
A system for controlling the fuel supply to a compression-ignition engine having at least one piston cylinder provided with a fuel injector, comprising: a source of fuel for said engine; a distributing channel provided with a first extension conduit terminating at said injector and with a second extension conduit leading to a drain from excess fuel; pump means disposed between said source and said channel for delivering fuel at high pressure To said channel; first valve means in said first conduit provided with biasing means normally maintaining same in a closed position; second valve means in said second conduit for intermittently blocking the path from said channel to said drain, said second valve means being provided with electromagnetic actuating means energizable for closing same and spring means effective in a de-energized state of said actuating means for holding said second valve means open, said actuating means including an ancillary actuator of insufficient power to overcome the action of said spring means and a main actuator capable of doing so when aided by said ancillary actuator; and electronic gating means for periodically closing and opening said second valve means with concurrent opening of said first valve means against the force of said biasing means, said gating means including a generator of first energizing pulses for said ancillary actuator and a generator of second energizing pulses, overlapping said first energizing pulses, for said main actuator.
Claim 8
Independent Claim
233 words
A system for controlling the fuel supply to a compression-ignition engine having at least one piston cylinder provided with a fuel injector, comprising: a source of fuel for said engine; a distributing channel provided with a first extension conduit terminating at said injector and with a second extension conduit leading to a drain from excess fuel; pump means disposed between said source and said channel for delivering fuel at high pressure To said channel; first valve means in said first conduit provided with biasing means normally maintaining same in a closed position; second valve means in said second conduit for intermittently blocking the path from said channel to said drain, said second valve means being provided with electromagnetic actuating means energizable for closing same and spring means effective in a de-energized state of said actuating means for holding said second valve means open, said actuating means including an ancillary actuator of insufficient power to overcome the action of said spring means and a main actuator capable of doing so when aided by said ancillary actuator; and electronic gating means for periodically closing and opening said second valve means with concurrent opening of said first valve means against the force of said biasing means, said gating means including a generator of first energizing pulses for said ancillary actuator and a generator of second energizing pulses, overlapping said first energizing pulses, for said main actuator.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |