US4224915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection apparatus
Assignee: Volkswagen AG
•
Filing: 1978-09-14
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Granted: 1980-09-30
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Expires: 1998-09-14
Abstract
Abstract Apparatus for injecting fuel into the intake pipes of an internal combustion engine. The apparatus has an air channel branching off from the intake line at a point ahead of an adjustable throttle flap; a fuel metering device supplying fuel to the air channel in dependence upon engine load; and a fuel delivery pump arranged to receive a fuel-air mixture from the air channel through a narrowed constriction. The fuel pump passes the fuel-air mixture, with additional air which may be supplied thereto, to a fuel distributor which directs the mixture to the individual intake pipes of the engine.
Inventors
- 👤 Klaus-Dieter Emmenthal
- 👤 Otto Schafer
- 👤 Rudolf-Helmut Strozyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:27
CPC Classifications
F; F02; F02D; F02D3/00; F02D3/04; F02M; F02M71/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
203 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) means for supplying auxiliary air at the outlet of said fuel pump for forming a fuel-air mixture to be supplied to said distributor, said auxiliary air supplying means including an air pressure generator and a bypass line connecting said air pressure generator to said fuel pump outlet in the immediate vicinity of said fuel pump.
Claim 2
Dependent Claim
203 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) means for supplying auxiliary air at the outlet of said fuel pump for forming a fuel-air mixture to be supplied to said distributor, said auxiliary air supplying means including an air pressure generator and a bypass line connecting said air pressure generator to said fuel pump outlet in the immediate vicinity of said fuel pump.
Claim 3
Dependent Claim
24 words
The fuel injection apparatus recited in claim 1, further comprising a check valve connecting the outlet of said fuel pump to said bypass line.
Claim 4
Dependent Claim
62 words
The fuel injection apparatus recited in claim 1, wherein a portion of said bypass line extends between the outlet of said fuel delivery pump and said distributor, and wherein the length of said portion of said bypass line and the lengths of the outlet lines of said distributor are dimensioned to provide a thorough mixing of the fuel with the auxiliary air.
Claim 5
Dependent Claim
17 words
The fuel injection apparatus recited in claim 1, wherein said air pressure generator is an engine-driven compressor.
Claim 6
Dependent Claim
47 words
The fuel injection apparatus recited in claim 2, wherein said air pressure generator is an engine-driven compressor which produces pressure fluctuations of the auxiliary air in said bypass line, said pressure fluctuations acting on said check valve to ensure a timed fuel injection into said bypass line.
Claim 7
Dependent Claim
18 words
The fuel injection apparatus recited in claim 5, wherein said compressor is constructed to produce said pressure fluctuations.
Claim 8
Dependent Claim
21 words
The fuel injection apparatus recited in claim 5, further comprising means for non-uniformly driving said compressor, thereby producing said pressure fluctuations.
Claim 9
Dependent Claim
23 words
The fuel injection apparatus recited in claim 1, wherein at least one working chamber of the engine serves as said air pressure generator.
Claim 10
Dependent Claim
29 words
The fuel injection apparatus recited in claim 8, further comprising a check valve connecting said working chamber to said bypass line to permit flow only into said bypass line.
Claim 11
Dependent Claim
194 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having a first intake line for conducting air to said intake pipes with a first arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) a second intake line arranged in parallel with said first intake line and having a second, arbitrarily adjustable throttle flap arranged therein; wherein said fuel metering means includes means for metering additional fuel in dependence upon the air flow through said second intake line.
Claim 12
Dependent Claim
194 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having a first intake line for conducting air to said intake pipes with a first arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) a second intake line arranged in parallel with said first intake line and having a second, arbitrarily adjustable throttle flap arranged therein; wherein said fuel metering means includes means for metering additional fuel in dependence upon the air flow through said second intake line.
Claim 13
Dependent Claim
31 words
The fuel injection apparatus recited in claim 10, further comprising means for supplying auxiliary air at said fuel delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Claim 14
Dependent Claim
25 words
The fuel injection apparatus recited in claim 10, wherein said second throttle flap is arranged to open and close together with said first throttle flap.
Claim 15
Dependent Claim
24 words
The fuel injection apparatus recited in claim 10, wherein said second throttle flap is arranged to open only under conditions of high engine load.
Claim 16
Dependent Claim
23 words
The fuel injection apparatus recited in claim 10, wherein said second intake line and said second throttle flap are components of a carburetor.
Claim 17
Dependent Claim
34 words
The fuel injection apparatus recited in claim 10, further comprising an air flap arranged in said second intake line and means operatively connecting said air flap with a component of said fuel metering means.
Claim 18
Dependent Claim
20 words
The fuel injection apparatus recited in claim 15, wherein said component of said fuel metering means is a needle valve.
Claim 19
Dependent Claim
168 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross-section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) auxiliary fuel supply means for supplying additional fuel, at a point immediately ahead of said distributor, for acceleration of the engine.
Claim 20
Dependent Claim
168 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross-section of said air channel and said distributor for supplying fuel and air to said distributor; and (e) auxiliary fuel supply means for supplying additional fuel, at a point immediately ahead of said distributor, for acceleration of the engine.
Claim 21
Dependent Claim
31 words
The fuel injection apparatus recited in claim 17, further comprising means for supplying auxiliary air at said fuel delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Claim 22
Dependent Claim
197 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor, said fuel delivery pump having separate chambers for fuel and air and a common drive means for changing the volume of said chambers to effect a pumping action; and (e) means for supplying additional air to said fuel delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Claim 23
Dependent Claim
197 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a fuel delivery pump connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor, said fuel delivery pump having separate chambers for fuel and air and a common drive means for changing the volume of said chambers to effect a pumping action; and (e) means for supplying additional air to said fuel delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Claim 24
Dependent Claim
67 words
The fuel injection apparatus recited in claim 19, wherein said means for changing the volumes of said chambers include a stepped piston having a first portion of smaller diameter extending into a first cylindrical region of a stepped cylinder forming one of said chambers and a second portion of larger diameter extending into a second cylindrical region of said stepped cylinder forming the other of said chambers.
Claim 25
Dependent Claim
41 words
The fuel injection apparatus recited in any one of the claims 1-20, wherein said fuel metering means include a main fuel supply tube projecting into said air channel having a fuel exit opening which is directed toward said fuel delivery pump.
Claim 26
Dependent Claim
192 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: p1 (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a delivery pump for fuel and air connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; (e) an auxiliary fuel supply means for supplying additional fuel directly into said intake pipes for acceleration of the engine; and (f) means for supplying auxiliary air at said delivery pump for forming a fuel-air mixture to be supplied to said distributor.
Claim 27
Dependent Claim
192 words
Apparatus for injecting fuel into the intake pipes of an internal combustion engine, said engine having an intake line for conducting air to said intake pipes with an arbitrarily adjustable throttle flap arranged therein, said fuel injection apparatus comprising, in combination: p1 (a) an air channel branching off from said intake line at a point ahead of said throttle flap, as viewed in the direction of air flow through said intake line, and having at its opposite end a narrowed cross section; (b) fuel metering means for supplying fuel to said air channel in dependence upon engine load; (c) a fuel distributor and means, connected to said distributor, for supplying a fuel-air mixture to the individual intake pipes of the engine; (d) a delivery pump for fuel and air connected between said narrowed cross section of said air channel and said distributor for supplying fuel and air to said distributor; (e) an auxiliary fuel supply means for supplying additional fuel directly into said intake pipes for acceleration of the engine; and (f) means for supplying auxiliary air at said delivery pump for forming a fuel-air mixture to be supplied to said distributor.
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |