US3880125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system for internal combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1973-03-12
•
Granted: 1975-04-29
•
Expires: 1993-03-12
Abstract
Abstract A fuel injection system for multi-cylinder internal combustion engines wherein the length of intervals during which the electromagnetic fuel injection valves remain open depends on the rate of air flow in the intake manifold. The flow meter in the manifold employs a pivotable flap which is mounted in the path of inflowing air and is rigid with a damping blade serving to prevent fluctuations in the angular position of the flap. The flap controls a variable resistor which is connected with one input of a control circuit for the coils of fuel injection valves. The position of the flap is further influenced by varying distance of the engine from sea level and by changes in the temperature of inflowing air.
Inventors
- 👤 Werner Kammerer
- 👤 Erwin Naegele
- 👤 Peter Romann
- 👤 Norbert Rittmannsberger
- 👤 Heinrich Knapp
- 👤 Gernot Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/182; F02M; F02M69/00; F02M69/30; F02M69/32; F02M69/46; F02M69/48
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
357 words
In an electrically controlled fuel injection system for internal combustion engines, particularly in an intermittently operated fuel injection system, a combination comprising an intake manifold having an inlet and an outlet; an adjustable throttle mounted in said manifold; at least one electromagnetic fuel injection valve provided in the region of said outlet; a control circuit operable to open said valve for varying intervals of time which determine the amounts of injected fuel, said circuit including an energy storing device which undergoes a first change of stored energy between successive openings of said valve and undergoes an opposite second change of stored energy during successive openings of said valve whereby the duration of the second change of stored energy determines the length of said intervals; transducer means for changing the duration of the second change of stored energy of said device as a function of changes in the quantity of air flowing in said manifold, comprising a regulating member including an output connected with said circuit and having a plurality of conditions each corresponding to a different length of said intervals, and an air quantity meter operative to change the condition of said regulating member as a function of changes in the rate of air flow in said manifold, said meter comprising a flap pivotably mounted in said manifold between said throttle and said inlet to assume a plurality of positions each corresponding to a different rate of air flow in said manifold, said flap being operatively connected with said regulating member, and pneumatic damping means rigid with said flap and operative to oppose fluctuations in the position of said flap, wherein said flow meter further comprises resilient means for opposing the pivotal movement of said flap in response to increasing rate of air flow in said manifold, said flap being pivotable about an axis which is adjacent to the path of air flow in said manifold, wherein said meter further includes a housing forming part of said manifold, said flap being mounted in said housing and said damping means comprising a blade inclined with respect to said flap, said flap having a hub which surrounds said axis.
Claim 2
Dependent Claim
357 words
In an electrically controlled fuel injection system for internal combustion engines, particularly in an intermittently operated fuel injection system, a combination comprising an intake manifold having an inlet and an outlet; an adjustable throttle mounted in said manifold; at least one electromagnetic fuel injection valve provided in the region of said outlet; a control circuit operable to open said valve for varying intervals of time which determine the amounts of injected fuel, said circuit including an energy storing device which undergoes a first change of stored energy between successive openings of said valve and undergoes an opposite second change of stored energy during successive openings of said valve whereby the duration of the second change of stored energy determines the length of said intervals; transducer means for changing the duration of the second change of stored energy of said device as a function of changes in the quantity of air flowing in said manifold, comprising a regulating member including an output connected with said circuit and having a plurality of conditions each corresponding to a different length of said intervals, and an air quantity meter operative to change the condition of said regulating member as a function of changes in the rate of air flow in said manifold, said meter comprising a flap pivotably mounted in said manifold between said throttle and said inlet to assume a plurality of positions each corresponding to a different rate of air flow in said manifold, said flap being operatively connected with said regulating member, and pneumatic damping means rigid with said flap and operative to oppose fluctuations in the position of said flap, wherein said flow meter further comprises resilient means for opposing the pivotal movement of said flap in response to increasing rate of air flow in said manifold, said flap being pivotable about an axis which is adjacent to the path of air flow in said manifold, wherein said meter further includes a housing forming part of said manifold, said flap being mounted in said housing and said damping means comprising a blade inclined with respect to said flap, said flap having a hub which surrounds said axis.
Claim 3
Dependent Claim
331 words
In an electrically controlled fuel injection system for internal combustion engines, particularly in an intermittently operated fuel injection system, a combination comprising an intake manifold having an inlet and an outlet; an adjustable throttle mounted in said manifold; at least one electromagnetic fuel injection valve provided in the region of said outlet; a control circuit operable to open said valve for varying intervals of time which determine the amounts of injected fuel, said circuit including an energy storing device which undergoes a first change of stored energy between successive openings of said valve and undergoes an opposite second change of stored energy during successive openings of said valve whereby the duration of the second change of stored energy determines the length of said intervals; transducer means for changing the duration of the second change of stored energy of said device as a function of changes in the quantity of air flowing in said manifold, comprising a regulating member including an output connected with said circuit and having a plurality of conditions each corresponding to a different length of said intervals, and an air quantity meter operative to change the condition of said regulating member as a function of changes in the rate of air flow in said manifold, said meter comprising a flap pivotably mounted in said manifold between said throttle and said inlet to assume a plurality of positions each corresponding to a different rate of air flow in said manifold, said flap being operatively connected with said regulating member, and pneumatic damping means rigid with said flap and operative to oppose fluctuations in the position of said flap, wherein said flow meter further comprises a housing forming part of said manifold and defining a measuring channel wherein the air flows from said inlet to said outlet and a damping chamber communicating with said measuring channel, said flap being located in said channel and said damping means comprising a blade rigid with said flap and located in said damping chamber.
Claim 4
Dependent Claim
331 words
In an electrically controlled fuel injection system for internal combustion engines, particularly in an intermittently operated fuel injection system, a combination comprising an intake manifold having an inlet and an outlet; an adjustable throttle mounted in said manifold; at least one electromagnetic fuel injection valve provided in the region of said outlet; a control circuit operable to open said valve for varying intervals of time which determine the amounts of injected fuel, said circuit including an energy storing device which undergoes a first change of stored energy between successive openings of said valve and undergoes an opposite second change of stored energy during successive openings of said valve whereby the duration of the second change of stored energy determines the length of said intervals; transducer means for changing the duration of the second change of stored energy of said device as a function of changes in the quantity of air flowing in said manifold, comprising a regulating member including an output connected with said circuit and having a plurality of conditions each corresponding to a different length of said intervals, and an air quantity meter operative to change the condition of said regulating member as a function of changes in the rate of air flow in said manifold, said meter comprising a flap pivotably mounted in said manifold between said throttle and said inlet to assume a plurality of positions each corresponding to a different rate of air flow in said manifold, said flap being operatively connected with said regulating member, and pneumatic damping means rigid with said flap and operative to oppose fluctuations in the position of said flap, wherein said flow meter further comprises a housing forming part of said manifold and defining a measuring channel wherein the air flows from said inlet to said outlet and a damping chamber communicating with said measuring channel, said flap being located in said channel and said damping means comprising a blade rigid with said flap and located in said damping chamber.
Claim 5
Dependent Claim
77 words
A combination as defined in claim 1, wherein said valve comprises a coil and said circuit comprises first and second inputs and an output, said first input being connected with the output of said regulating member, and further comprising amplifier means connected between the output of said control circuit and said coil, and signal generating means connected with said second input and operative to furnish to said circuit signals in synchronism with the RPM of the engine.
Claim 6
Dependent Claim
15 words
A combination as defined in claim 1, wherein said energy storing device includes a capacitor.
Claim 7
Dependent Claim
15 words
A combination as defined in claim 1, wherein said energy storing device includes an inductance.
Claim 8
Dependent Claim
15 words
A combination as defined in claim 1, wherein said regulating member is a variable resistor.
Claim 9
Dependent Claim
47 words
A combination as defined in claim 4, wherein said flow meter further comprises a shaft rotably mounted in said housing and defining said axis, said hub having an axial bore receiving said shaft and said housing having a sleeve extending into said bore and surrounding said shaft.
Claim 10
Dependent Claim
25 words
A combination as defined in claim 7, wherein said flow meter further comprises at least one antifriction bearing interposed between said shaft and said sleeve.
Claim 11
Dependent Claim
69 words
A combination as defined in claim 7, wherein said shaft comprises an end portion extending beyond said sleeve and said flow meter further comprises a holder provided on said end portion, said flow meter further comprising a helical spring arranged to oppose the pivotal movement of said flap in response to increasing rate of air flow in said manifold, said spring having an end portion secured to said holder.
Claim 12
Dependent Claim
49 words
A combination as defined in claim 9, wherein said flow meter further comprises a retainer coaxial with said shaft and angularly adjustably secured to said housing, said spring further having a second end portion spaced radially outwardly from said first mentioned end portion thereof and secured to said retainer.
Claim 13
Dependent Claim
19 words
A combination as defined in claim 10, wherein said retainer is a disk having a recess for said spring.
Claim 14
Dependent Claim
19 words
A combination as defined in claim 10, wherein said retainer is a disk having an annulus of gear teeth.
Claim 15
Dependent Claim
63 words
A combination as defined in claim 7, wherein said shaft comprises an end portion extending beyond said sleeve and provided with a carrier, said regulating member including a variable resistor having a movable portion secured to said carrier and a stationary portion which constitutes said output and along which said movable portion slides in response to rotation of said shaft with said flap.
Claim 16
Dependent Claim
28 words
A combination as defined in claim 13, wherein said movable portion of said resistor includes a contact adjacent to and coaxial with the end portion of said shaft.
Claim 17
Dependent Claim
29 words
A combination as defined in claim 13, wherein said flow meter furtHer comprises a weight secured to said carrier and arranged to statically balance said flap and said blade.
Claim 18
Dependent Claim
62 words
A combination as defined in claim 13, wherein said flow meter further comprises supporting means provided on said carrier and turnable within limits relative to said shaft, said supporting means having a prong, and two stationary contact elements normally engaging with each other, said prong being arranged to disengage said contact elements in at least one angular position of said supporting means.
Claim 19
Dependent Claim
35 words
A combination as defined in claim 13, wherein said variable resistor is a potentiometer and said movable portion is the slider of said potentiometer, said resistor further comprising a support for said stationary portion thereof.
Claim 20
Dependent Claim
17 words
A combination as defined in claim 17, wherein said stationary portion consists of conductive synthetic plastic material.
Claim 21
Dependent Claim
15 words
A combination as defined in claim 17, wherein said stationary portion is a laminated structure.
Claim 22
Dependent Claim
42 words
A combination as defined in claim 17, wherein said support consists of ceramic material and comprises a plurality of current-conducting fields, said flow meter further comprising a plurality of elastic contacts engaging said fields to connect said stationary portion with said circuit.
Claim 23
Dependent Claim
24 words
A combination as defined in claim 17, further comprising a control resistor connected in series with said stationary portion and maintained on said support.
Claim 24
Dependent Claim
39 words
A combination as defined in claim 17, further comprising a socket provided on said housing and a plurality of contacts extending into said socket and connected with said circuit, one of said contacts being connected with said movable portion.
Claim 25
Dependent Claim
42 words
A combination as defined in claim 1, wherein said flow meter further comprises a normally closed relief valve provided in said flap and arranged to open in response to development of a predetermined pressure differential at the opposite sides of said flap.
Claim 26
Dependent Claim
46 words
A combination as defined in claim 1, wherein said flow meter further comprises a housing forming part of said manifold and receiving said flap, said housing being provided with a bypass channel having end portions communicating with said manifold at the opposite sides of said flap.
Claim 27
Dependent Claim
18 words
A combination as defined in claim 24, further comprising adjustable flow restrictor means provided in said bypass channel.
References Cited (Backward Citations)
US2886015A
Cited
US2982276A
Cited
US3581723A
Cited
US3683877A
Cited
US3575147A
Cited
US3683870A
Cited
US3710769A
Cited
US3750631A
Cited
US3727081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |