US3974811A — Fuel injection system

Claim 1

Independent Claim 150 words

A fuel injection system for mixture-compressing externally ignited internal combustion engines employing continuous fuel injections comprising, in combinations: a. an induction tube into which fuel is to be continuously injected; b. a measuring member positioned within said induction tube for moving as a function of the air flow rate therein; c. an arbitrarily actuable, throttle butterfly valve disposed within said induction tube, said measuring member and said butterfly fly being disposed sequentially; d. a fuel metering and quantity distribution valve assembly including a fuel passage, a movable part disposed in the fuel passage, said valve assembly being coupled to said measuring member and controlled thereby for metering out a fuel quantity in proportion to the air flow rate in said induction tube; e. means for providing a restoring force, which acts in opposition to the force provided by the air flow in the induction tube, to said measuring member including:

Claim 2

Dependent Claim 150 words

A fuel injection system for mixture-compressing externally ignited internal combustion engines employing continuous fuel injections comprising, in combinations: a. an induction tube into which fuel is to be continuously injected; b. a measuring member positioned within said induction tube for moving as a function of the air flow rate therein; c. an arbitrarily actuable, throttle butterfly valve disposed within said induction tube, said measuring member and said butterfly fly being disposed sequentially; d. a fuel metering and quantity distribution valve assembly including a fuel passage, a movable part disposed in the fuel passage, said valve assembly being coupled to said measuring member and controlled thereby for metering out a fuel quantity in proportion to the air flow rate in said induction tube; e. means for providing a restoring force, which acts in opposition to the force provided by the air flow in the induction tube, to said measuring member including:

Claim 3

Dependent Claim 194 words

at least one pressure control valve controllable in dependence on at least one engine operating parameter; 2. a control pressure circuit having said control valve therein; 3. means for supplying pressurized fluid to said control pressure circuit; and 4. a control slide formed by the movable part of the fuel metering and quantity distribution valve assembly, said control slide being acted upon by the fluid in said control pressure circuit coupled to said measuring member for transmitting the restoring force thereto; f. at least one movable heatable control element operable in dependence on temperature and at least one spring forming part of said at least one pressure control valve, said control element acting in opposition to the force of said spring when at least one operating temperature of the engine is below normal running temperature; g. an electrical heating means for heating said control element; h. valve means coupled to said pressure control circuit and responsive to movement of said butterfly valve for reducing the pressure of the pressurized fluid in said control circuit during engine warm-up phase when the engine is suddenly accelerated; and i. an electromagnet provided for controlling the valve means.

Claim 4

Dependent Claim 194 words

at least one pressure control valve controllable in dependence on at least one engine operating parameter; 2. a control pressure circuit having said control valve therein; 3. means for supplying pressurized fluid to said control pressure circuit; and 4. a control slide formed by the movable part of the fuel metering and quantity distribution valve assembly, said control slide being acted upon by the fluid in said control pressure circuit coupled to said measuring member for transmitting the restoring force thereto; f. at least one movable heatable control element operable in dependence on temperature and at least one spring forming part of said at least one pressure control valve, said control element acting in opposition to the force of said spring when at least one operating temperature of the engine is below normal running temperature; g. an electrical heating means for heating said control element; h. valve means coupled to said pressure control circuit and responsive to movement of said butterfly valve for reducing the pressure of the pressurized fluid in said control circuit during engine warm-up phase when the engine is suddenly accelerated; and i. an electromagnet provided for controlling the valve means.

Claim 5

Dependent Claim 34 words

A fuel injection system according to claim 1, wherein said means for reducing the pressure includes spring means, said electromagnet being arranged to reduce the force of said spring means on said valve means.

Claim 6

Dependent Claim 57 words

A fuel injection system according to claim 1, further comprising a second control valve including a second, heatable control element operable in dependence on temperature, said second control valve being positioned in said control pressure circuit downstream from said at least one control valve and openable at a lower pressure than said at least one control valve.

Claim 7

Dependent Claim 36 words

A fuel injection system according to claim 1, wherein said means for supplying pressurized fluid to said control pressure circuit is a means for supplying pressurized fuel to said control pressure circuit as the pressurized fluid.

Claim 8

Dependent Claim 150 words

A fuel injection system for mixture-compressing externally ignited internal combustion engines employing continuous fuel injections comprising, in combinations: a. an induction tube into which fuel is to be continuously injected; b. a measuring member positioned within said induction tube for moving as a function of the air flow rate therein; c. an arbitrarily actuable, throttle butterfly valve disposed within said induction tube, said measuring member and said butterfly fly being disposed sequentially; d. a fuel metering and quantity distribution valve assembly including a fuel passage, a movable part disposed in the fuel passage, said valve assembly being coupled to said measuring member and controlled thereby for metering out a fuel quantity in proportion to the air flow rate in said induction tube; e. means for providing a restoring force, which acts in opposition to the force provided by the air flow in the induction tube, to said measuring member including:

Claim 9

Dependent Claim 150 words

A fuel injection system for mixture-compressing externally ignited internal combustion engines employing continuous fuel injections comprising, in combinations: a. an induction tube into which fuel is to be continuously injected; b. a measuring member positioned within said induction tube for moving as a function of the air flow rate therein; c. an arbitrarily actuable, throttle butterfly valve disposed within said induction tube, said measuring member and said butterfly fly being disposed sequentially; d. a fuel metering and quantity distribution valve assembly including a fuel passage, a movable part disposed in the fuel passage, said valve assembly being coupled to said measuring member and controlled thereby for metering out a fuel quantity in proportion to the air flow rate in said induction tube; e. means for providing a restoring force, which acts in opposition to the force provided by the air flow in the induction tube, to said measuring member including:

Claim 10

Dependent Claim 211 words

at least one pressure control valve controllable in dependence on at least one engine operating parameter; 2. a control pressure circuit having said control valve therein; 3. means for supplying pressurized fluid to said control pressure circuit; and 4. a control slide formed by the movable part of the fuel metering and quantity distribution valve assembly, said control slide being acted upon by the fluid in said control pressure circuit coupled to said measuring member for transmitting the restoring force thereto; f. at least one movable heatable control element operable in dependence on temperature and at least one spring forming part of said at least one pressure control valve, said control element acting in opposition to the force of said spring when at least one operating temperature of the engine is below normal running temperature; g. an electrical heating means for heating said control element; h. valve means coupled to said pressure control circuit and responsive to movement of said butterfly valve for reducing the pressure of the pressurized fluid in said control circuit during engine warm-up phase when the engine is suddenly accelerated, wherein the volume of said control pressure circuit is adjustable, said means for reducing the pressure being coupled to said control pressure circuit for changing its volume.

Claim 11

Dependent Claim 211 words

at least one pressure control valve controllable in dependence on at least one engine operating parameter; 2. a control pressure circuit having said control valve therein; 3. means for supplying pressurized fluid to said control pressure circuit; and 4. a control slide formed by the movable part of the fuel metering and quantity distribution valve assembly, said control slide being acted upon by the fluid in said control pressure circuit coupled to said measuring member for transmitting the restoring force thereto; f. at least one movable heatable control element operable in dependence on temperature and at least one spring forming part of said at least one pressure control valve, said control element acting in opposition to the force of said spring when at least one operating temperature of the engine is below normal running temperature; g. an electrical heating means for heating said control element; h. valve means coupled to said pressure control circuit and responsive to movement of said butterfly valve for reducing the pressure of the pressurized fluid in said control circuit during engine warm-up phase when the engine is suddenly accelerated, wherein the volume of said control pressure circuit is adjustable, said means for reducing the pressure being coupled to said control pressure circuit for changing its volume.

Claim 12

Dependent Claim 53 words

A fuel injection system according to claim 5, wherein said control pressure circuit includes a piston mounted axially slidable in a pressure chamber, one end face of said piston being exposed to pressurized fluid in said control pressure circuit and its other end face being exposed to pressurized fluid in a relief circuit.

Claim 13

Dependent Claim 24 words

A fuel injection system according to claim 6, including a pair of stops for limiting axial displacement of said piston in both axial directions.

Claim 14

Dependent Claim 25 words

A fuel injection system according to claim 6, including an electromagnet for opening a relief valve in said relief circuit for reducing the pressure therein.

Claim 15

Dependent Claim 38 words

A fuel injection system according to claim 8, wherein said piston is positioned with its said one end face subjected to a force smaller than the force acting on its other face when said relief valve is closed.

Claim 16

Dependent Claim 25 words

A fuel injection system according to claim 9, wherein said control pressure circuit and said relief circuit are connected by two throttles and check valve.

Claim 17

Dependent Claim 136 words

A fuel injection system according to claim 5 further comprising: a pressure-sensitive jar within which there is mounted a diaphragm which separates a first chamber from a second chamber; and an air line interconnecting said first chamber with a point in said induction tube downstream from said throttle butterfly valve, wherein said means for reducing the pressure of the pressurized fluid in said control circuit includes a diaphragm bellows, the interior volume of which is in fluid communication with said control pressure circuit, one end of said diaphragm bellows being affixed to a wall of the pressure-sensitive jar, the other end of which being connected to the diaphragm which separates the first chamber within said jar from the second chamber within said jar, said first and second chambers being in fluid communication via a throttle aperture.

Claim 18

Dependent Claim 43 words

A fuel injection system according to claim 11, wherein said air line contains a valve which has a movable member in the form of an electrically heatable bimetallic spring for closing said air line after termination of the warm-up phase of engine operation.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-08-17	1980-02-16	1980-08-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-08-17	1984-02-16	1984-08-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-08-17	1988-02-16	1988-08-17	$7700.00	Window Closed / Lapsed

Fuel injection system

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