US4920942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for supplying fuel to internal combustion engines
Assignee: Bosch Corp
•
Filing: 1988-04-19
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Granted: 1990-05-01
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Expires: 2008-04-19
Abstract
Abstract For supplying fuel from a fuel tank to an internal combustion engine by a fuel supply pump, a fuel delivery pressure of the fuel supply pump is regulated by a pressure regulating valve so as to maintain the difference between the fuel delivery pressure of the pump and an inner pressure of an intake manifold of the engine at a prescribed constant value, and the delivery volume of fuel from the pump is controlled in response to the fuel delivery pressure so as to minimize the amount of surplus fuel produced by the pressure regulating operation of the pressure regulating valve.
Inventors
- 👤 Kyoichi Fujimori
- 👤 Masaki Sano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
F; F02; F02M; F02M49/00; F02M69/00; F02M69/02; F02D; F02D41/00; F02D41/30; F02D41/3082; F02M37/00; F02M37/04; F02M37/08; F02M51/00; F02M51/02; F02M69/16; F02M69/18; F02M69/20; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; F02D2250/00; F02D2250/31
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
203 words
A fuel supplying system in which fuel in a fuel supply means is pressurized by means of a fuel supply pump and is supplied to an internal combustion engine; said system comprising: a pressure regulating member for regulating the pressure of pressurized fuel derived from said fuel supply pump by returning surplus fuel to said fuel supply means so as to maintain the difference between an output fuel pressure of said fuel supply pump and an inner pressure of an intake manifold of said engine at a prescribed constant value; a fuel injecting member for injecting into said engine the fuel regulated in pressure by said pressure regulating member; a sensing means for sensing the pressure of fuel delivered by said fuel supply pump, said sensing means being incorporated in said fuel supply pump; and, a control means incorporated in said fuel supply pump and responsive to said sensing means for controlling the amount of fuel delivered by said fuel supply pump in accordance with the pressure of fuel delivered from said fuel supply pump so that the amount of surplus fuel produced by the pressure regulating operation of said pressure regulating member and returned to the fuel supply means is effectively reduced.
Claim 2
Dependent Claim
203 words
A fuel supplying system in which fuel in a fuel supply means is pressurized by means of a fuel supply pump and is supplied to an internal combustion engine; said system comprising: a pressure regulating member for regulating the pressure of pressurized fuel derived from said fuel supply pump by returning surplus fuel to said fuel supply means so as to maintain the difference between an output fuel pressure of said fuel supply pump and an inner pressure of an intake manifold of said engine at a prescribed constant value; a fuel injecting member for injecting into said engine the fuel regulated in pressure by said pressure regulating member; a sensing means for sensing the pressure of fuel delivered by said fuel supply pump, said sensing means being incorporated in said fuel supply pump; and, a control means incorporated in said fuel supply pump and responsive to said sensing means for controlling the amount of fuel delivered by said fuel supply pump in accordance with the pressure of fuel delivered from said fuel supply pump so that the amount of surplus fuel produced by the pressure regulating operation of said pressure regulating member and returned to the fuel supply means is effectively reduced.
Claim 3
Dependent Claim
56 words
A system as claimed in claim 1 wherein said sensing means is a transducing means for producing an electric signal corresponding to the pressure of fuel delivered from said fuel supply pump, and said controlling means is an electric circuit means responsive to said electric signal for controlling the rotational speed of said fuel supply pump.
Claim 4
Dependent Claim
40 words
A system as claimed in claim 1 further comprising a driving means for producing a driving signal for electronically driving said fuel injecting member so as to provide said engine with an adequate amount of fuel for operating said engine.
Claim 5
Dependent Claim
42 words
A system as claimed in claim 1 wherein said pressure regulating member adjusts the amount of fuel returned to said fuel supply means in response to the intake pressure, whereby the pressure of fuel supplied to said fuel injecting member is adjusted.
Claim 6
Dependent Claim
59 words
A system as claimed in claim 1 wherein said pressure regulating member has a housing which has an inlet portion and an outlet portion, a return pipe whose opening is located in the housing, and a regulator which cooperates with the opening to adjust the amount of fuel returned through the return pipe in response to the intake pressure.
Claim 7
Dependent Claim
80 words
A system as claimed in claim 2 wherein said controlling means has a first circuit means responsive to said electric signal for producing an output signal relating to said electric signal, and a driving signal generator means responsive to the output signal for producing a driving control signal by which the rotational speed of said fuel supply pump is controlled so as to increase/decrease in correspondence to the increase/decrease of the pressure of fuel delivered by said fuel supply pump.
Claim 8
Dependent Claim
56 words
A system as claimed in claim 6 wherein said controlling means further comprises a first differential circuit which is responsive to sudden increasing change in said electric signal and provides said first circuit means with a signal of a high level corresponding to the sudden increasing change, whereby response characteristics of said controlling means are improved.
Claim 9
Dependent Claim
56 words
A system as claimed in claim 2 wherein said controlling means further comprises a second differential circuit which is responsive to sudden decreasing change in said electric signal and provides said first circuit means with a signal of a high level corresponding to the sudden decreasing change, whereby response characteristics of said controlling means is improved.
Claim 10
Dependent Claim
35 words
A system as claimed in claim 1, further comprising a driving means for electronically driving said fuel injecting member so as to provide said engine with an adequate amount of fuel for operating said engine.
Claim 11
Dependent Claim
73 words
A system as claimed in claim 1, further comprising a driving means for producing a driving signal for electronically driving said fuel injecting member so as to provide said engine with an adequate amount of fuel for operating said engine, and means responsive to said driving signal for stopping the pressurizing operation of the fuel supply pump when the amount of fuel injected from said fuel injecting member to said engine is zero.
Claim 12
Dependent Claim
22 words
A system as claimed in claim 1, wherein said control means and said sensing means are incorporated into said fuel supply pump.
Claim 13
Dependent Claim
65 words
A system as claimed in claim 20, wherein said fuel supply pump comprises a casing having an input port for receiving fuel from said fuel supply means and an output port for providing pressurized fuel to said fuel regulating member, and wherein said sensing means is incorporated in said casing to detect the pressure of said pressurized fuel at the output port of said casing.
References Cited (Backward Citations)
US3822677A
Cited
US3967598A
Cited
US3913547A
Cited
US3935851A
Cited
US4125093A
Cited
US4112901A
Cited
US4205648A
Cited
US4248194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |