Patent US5443046A successfully refreshed from Google Patents.
US5443046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Efficiently pumped fuel supply system
Assignee: Brunswick Corp
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Filing: 1994-01-13
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Granted: 1995-08-22
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Expires: 2014-01-13
Abstract
Abstract In a low pressure continuous flow fuel injection system for an internal combustion engine, an electric fuel pump (18) is energized with a variable duty cycle to vary the pumped volume output of the pump according to engine fuel requirements. The duty cycle is varied to energize the pump to pump substantially only the amount of fuel required by the engine, such that at idle or low engine speed, the pump is energized a lower percentage of the time than at high engine speed. Fuel flow through the fuel injector (12) is continuous, but energization of the pump is not, such that the pump is not pumping at full capacity when unneeded. An electric idle air control valve (54) is also energized with a variable duty cycle to vary the amount of bypass idle air supplied to the intake manifold (10).
Inventors
- 👤 Brian R. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:16
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/46; F02M69/462; F02M69/465; F02M11/00; F02M11/02; F02M3/00; F02M3/06; F02M3/07; F02M35/00; F02M35/10; F02M35/10209; F02M35/10216; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/0279; F02D9/08; F02D9/10; F02D9/1035; F02D9/1055; F02M35/10373; F02M35/1038
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
A method for supplying fuel to an internal combustion engine having an intake manifold, comprising providing a continuation flow fuel injector with an inlet receiving fuel, and an outlet supplying fuel to said intake manifold, said fuel injector outlet being in continuous communication with said fuel injector inlet, providing an electric fuel pump supplying fuel to said fuel injector inlet, and energizing said fuel pump with a variable duty cycle to vary the pumped volume output of said pump according to engine fuel requirements, varying said duty cycle to energize said pump to pump substantially only the amount of fuel required by said engine, such that at low engine speed, said pump is energized a lower percentage of the time than at high engine speed, and such that fuel flow through said fuel injector is continuous, but energization of said pump is not, such that said pump is not pumping at full capacity when unneeded, supplying fuel from said fuel injector inlet to said fuel injector outlet along a longitudinal axis, and emitting fuel from said fuel injector outlet transversely of said longitudinal axis.
Claim 2
Independent Claim
184 words
A method for supplying fuel to an internal combustion engine having an intake manifold, comprising providing a continuation flow fuel injector with an inlet receiving fuel, and an outlet supplying fuel to said intake manifold, said fuel injector outlet being in continuous communication with said fuel injector inlet, providing an electric fuel pump supplying fuel to said fuel injector inlet, and energizing said fuel pump with a variable duty cycle to vary the pumped volume output of said pump according to engine fuel requirements, varying said duty cycle to energize said pump to pump substantially only the amount of fuel required by said engine, such that at low engine speed, said pump is energized a lower percentage of the time than at high engine speed, and such that fuel flow through said fuel injector is continuous, but energization of said pump is not, such that said pump is not pumping at full capacity when unneeded, supplying fuel from said fuel injector inlet to said fuel injector outlet along a longitudinal axis, and emitting fuel from said fuel injector outlet transversely of said longitudinal axis.
Claim 3
Dependent Claim
35 words
The method according to claim 1 comprising varying said duty cycle of energization of said pump according to the difference between the pressure at said fuel injector inlet and the pressure in said intake manifold.
Claim 4
Dependent Claim
20 words
The method according to claim 2 comprising varying said duty cycle of energization of said pump according to engine speed.
Claim 5
Dependent Claim
51 words
The method according to claim 1 comprising providing an emulsion air bleed communicating with said fuel injector between said fuel injector inlet and said fuel injector outlet and entraining air into the fuel passing through said fuel injector to help breakup the fuel prior to being released into said intake manifold.
Claim 6
Dependent Claim
178 words
A fuel injection system for an internal combustion engine having an intake manifold, comprising a continuous flow fuel injector with an inlet receiving fuel, and an outlet supplying fuel to said intake manifold, said fuel injector outlet being in continuous communication with said fuel injector inlet, a variable duty cycle energized electric fuel pump supplying variable volume pumped fuel to said fuel injector inlet according to engine fuel requirements, wherein said duty cycle is varied to energize said pump to pump substantially only the amount of fuel required by said engine, such that at low engine speed, said pump is energized a lower percentage of the time than at high engine speed, and such that fuel flows through said fuel injector continuously, but said pump is not continuously energized, such that said pump is not pumping at full capacity when unneeded, said fuel is supplied from said fuel injector inlet to said fuel injector outlet along a longitudinal axis, and wherein said fuel injector outlet has a plurality of discharge ports emitting fuel transversely of said longitudinal axis.
Claim 7
Dependent Claim
178 words
A fuel injection system for an internal combustion engine having an intake manifold, comprising a continuous flow fuel injector with an inlet receiving fuel, and an outlet supplying fuel to said intake manifold, said fuel injector outlet being in continuous communication with said fuel injector inlet, a variable duty cycle energized electric fuel pump supplying variable volume pumped fuel to said fuel injector inlet according to engine fuel requirements, wherein said duty cycle is varied to energize said pump to pump substantially only the amount of fuel required by said engine, such that at low engine speed, said pump is energized a lower percentage of the time than at high engine speed, and such that fuel flows through said fuel injector continuously, but said pump is not continuously energized, such that said pump is not pumping at full capacity when unneeded, said fuel is supplied from said fuel injector inlet to said fuel injector outlet along a longitudinal axis, and wherein said fuel injector outlet has a plurality of discharge ports emitting fuel transversely of said longitudinal axis.
Claim 8
Dependent Claim
36 words
The system according to claim 5 wherein said duty cycle of energization of said pump is varied according to the difference between the pressure at said fuel injector inlet and the pressure in said intake manifold.
Claim 9
Dependent Claim
21 words
The system according to claim 6 wherein said duty cycle of energization of said pump is varied according to engine speed.
Claim 10
Dependent Claim
53 words
The system according to claim 5 further comprising in combination an emulsion air bleed communicating with said fuel injector between said fuel injector inlet and said fuel injector outlet and entraining air into said fuel passing through said fuel injector to help breakup the fuel prior to being released into said intake manifold.
References Cited (Backward Citations)
US4048964A
Cited
US4034730A
Cited
US4646706A
Cited
US4522176A
Cited
US4643147A
Cited
US4711219A
Cited
US4699109A
Cited
US4732131A
Cited
US4750464A
Cited
US4763626A
Cited
US4777913A
Cited
US4840148A
Cited
US4794888A
Cited
US5241938A
Cited
US5156133A
Cited
US5284119A
Cited
US5287839A
Cited
US5339785A
Cited
US5237975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |