US4246879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection apparatus
Assignee: Volkswagen AG
•
Filing: 1977-08-25
•
Granted: 1981-01-27
•
Expires: 1997-08-25
Abstract
Abstract A fuel injection apparatus for use with an internal combustion engine provides for the injection of a fuel carrying air stream into the intake manifold of the engine adjacent the intake port of each cylinder. The apparatus includes a fuel proportioning device which releases a quantity of fuel to the fuel carrying air stream in accordance with the rate of air flow in the engine air intake.
Inventors
- 👤 Ernst Fiala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:08
CPC Classifications
F; F02; F02M; F02M71/00; F02M71/02
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
176 words
Apparatus for injecting fuel into the intake manifold of an internal combustion engine having at least one combustion chamber with an intake port and having a first intake passage through which there is an air flow to said combustion chamber by said intake manifold, comprising: a second passage, separate from said first passage and having a venturi-like constriction; a pump following said constriction in said second passage, for drawing a continuous stream of air through said second passage, said pump having an output at a pressure which is greater than the pressure in said intake manifold; fuel proportioning means comprising a fuel reservoir wherein fuel is maintained at a constant level, a first orifice communicating with said air passage constriction, and a second variable cross-section orifice, arranged between said first orifice and said fuel reservoir; means, responsive to the rate of air flow in said first passage, for controlling the opening of said second orifice; and means for supplying the pressurized fuel carrying air stream from said pump to said intake manifold adjacent said intake port.
Claim 2
Dependent Claim
176 words
Apparatus for injecting fuel into the intake manifold of an internal combustion engine having at least one combustion chamber with an intake port and having a first intake passage through which there is an air flow to said combustion chamber by said intake manifold, comprising: a second passage, separate from said first passage and having a venturi-like constriction; a pump following said constriction in said second passage, for drawing a continuous stream of air through said second passage, said pump having an output at a pressure which is greater than the pressure in said intake manifold; fuel proportioning means comprising a fuel reservoir wherein fuel is maintained at a constant level, a first orifice communicating with said air passage constriction, and a second variable cross-section orifice, arranged between said first orifice and said fuel reservoir; means, responsive to the rate of air flow in said first passage, for controlling the opening of said second orifice; and means for supplying the pressurized fuel carrying air stream from said pump to said intake manifold adjacent said intake port.
Claim 3
Dependent Claim
25 words
Apparatus as specified in claim 1 wherein there is provided a nozzle pin, movable in said second orifice, thereby to vary said second orifice opening.
Claim 4
Dependent Claim
70 words
Apparatus as specified in claim 2 wherein said air intake passage includes a variable throttle, wherein there is provided a flap, connected to said nozzle pin for moving said pin in said orifice, said flap being arranged in said air intake passage ahead of said throttle in the direction of flow, and being movable by air flow through said air intake passage against a spring, thereby to move said pin.
Claim 5
Dependent Claim
37 words
Apparatus as specified in claim 2 wherein said nozzle pin is axially tapered and forms an annular opening in said second orifice, the cross-section of said annular opening varying according to the axial position of said pin.
Claim 6
Dependent Claim
54 words
Apparatus as specified in claim 4 wherein said pin is tapered to a larger cross-section on the portion of said pin extending through said second orifice and into said reservoir, whereby when said pin is dipped into said reservoir to open said second orifice, said pin temporarily raises said fluid level in said reservoir.
Claim 7
Dependent Claim
54 words
Apparatus as specified in claim 1 wherein said air intake passage includes a throttle and a flap responsive to air flow through said intake passage for operating said fuel proportioning means and wherein said pump draws said separate air stream from a portion of said air intake passage between said throttle and said flap.
Claim 8
Dependent Claim
15 words
Apparatus as specified in claim 1 wherein said pump is an electrically driven gear pump.
Claim 9
Dependent Claim
19 words
Apparatus as specified in claim 1 wherein there are provided means for varying the flow volume of said pump.
Claim 10
Dependent Claim
27 words
Apparatus as specified in claim 8 wherein said means for varying the flow volume of said pump comprises a variable speed electric motor for driving said pump.
Claim 11
Dependent Claim
21 words
Apparatus as specified in claim 8 wherein said means for varying the flow volume of said pump comprises mechanically operative means.
Claim 12
Dependent Claim
31 words
Apparatus as specified in claim 10 wherein said mechanically operative means comprises a bypass connecting the inlet and outlet of said pump and a variable opening valve arranged in said bypass.
Claim 13
Dependent Claim
39 words
Apparatus as specified in claim 1 wherein there are provided dividing means connected to the outlet of said pump for dividing said air stream into a number of passages at least equal to the number of said combustion chambers.
Claim 14
Dependent Claim
36 words
Apparatus as specified in claim 12 wherein there are provided first nozzles between said dividing means and said passages and second nozzles between said passages and said intake manifold in the region of said intake ports.
Claim 15
Dependent Claim
25 words
Apparatus as specified in claim 1 wherein there is provided heating means at the outlet of said pump for heating said fuel carrying air stream.
Claim 16
Dependent Claim
16 words
Apparatus as specified in claim 14 wherein said heating means comprises an electric resistance heating element.
Claim 17
Dependent Claim
47 words
Apparatus as specified in claim 1 wherein there is provided a fuel tank connected to said fuel proportioning means and wherein a portion of said fuel carrying air stream is provided from the outlet of said pump to said fuel tank thereby to pressurize said fuel tank.
Claim 18
Dependent Claim
19 words
Apparatus as specified in claim 16 wherein there is provided a pressure reducer between said pump and said tank.
Claim 19
Dependent Claim
27 words
Apparatus as specified in claim 1 wherein there is provided means for partially reacting said fuel carrying air stream thereby to heat the intake of said engine.
Claim 20
Dependent Claim
79 words
Apparatus as specified in claim 18 wherein there are provided means for dividing said fuel carrying air stream into a number of passages, said number being in excess of the number of said cylinders, at least one of said excess passages providing a portion of said fuel carrying air stream to said intake passage, and wherein there is provided means for igniting said air stream from said excess passage in said intake passage, thereby to partially react said fuel.
Claim 21
Dependent Claim
22 words
Apparatus as specified in claim 19 wherein there is provided a controllable valve in said excess passage connected to said intake passage.
Claim 22
Dependent Claim
12 words
Apparatus as specified in claim 20 wherein said valve is magnetically activated.
Claim 23
Dependent Claim
83 words
Apparatus as specified in claim 2 wherein said intake passage includes a throttle, wherein there is provided a fixed tapered bullet in said passage prior to said throttle, a control ring, axially moveable in said passage against a restoring spring and surrounding said bullet to form a variable cross-section annular passage between said bullet and said ring, and wherein said nozzle pin is connected to said control ring and activated by movement of said ring in response to air flow through said passage.
Claim 24
Dependent Claim
23 words
Apparatus as specified in claim 22 wherein said control ring is connected to the walls of said intake passage by annular rolling diaphragm.
Claim 25
Dependent Claim
30 words
Apparatus as specified in claim 22 wherein said control ring is connected to said nozzle pin by a rod mounted in a cylindrical guide and axially movable in said guide.
Claim 26
Dependent Claim
28 words
Apparatus as specified in claim 24 wherein said rod is provided with a screw for adjusting the position of said nozzle pin with respect to said control ring.
Claim 27
Dependent Claim
46 words
Apparatus as specified in claim 24 wherein said guide is centrally mounted and coaxial within said intake line, wherein an extension of said guide forms at least a portion of said fuel reservoir, and wherein said second orifice is mounted between said guide and said reservoir.
Claim 28
Dependent Claim
26 words
Apparatus as specified in claim 24 wherein there are provided control means for axially moving said control ring according to the operating condition of said engine.
Claim 29
Dependent Claim
32 words
Apparatus as specified in claim 27 wherein said control means comprises a spring connecting said ring to said throttle for moving said ring when said throttle is in a fully opened position.
Claim 30
Dependent Claim
30 words
Apparatus as specified in claim 27 wherein said control means comprises a damper connected between said throttle and said ring for moving said ring when said throttle is opened rapidly.
Claim 31
Dependent Claim
19 words
Apparatus as specified in claim 1 wherein there is provided means for adding exhaust gasses to said air stream.
References Cited (Backward Citations)
US1460667A
Cited
US3198498A
Cited
US3168084A
Cited
US3259378A
Cited
DE1281748B
Cited
US3286998A
Cited
DE1281746B
Cited
US3285585A
Cited
US3404667A
Cited
US3713630A
Cited
US3721428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |