US3807376A
Expired / Lapsed
US
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Apparatus for regulating the recycling of partially combusted fuels in an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1971-12-17
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Granted: 1974-04-30
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Expires: 1991-12-17
Abstract
Abstract In an internal combustion engine having an inlet manifold and an outlet or exhaust pipe, the present apparatus regulates the recycling of partially combusted fuels. The apparatus includes a feedback pipe which connects the exhaust pipe and the intake manifold to permit the exhaust gases to flow from the former to the latter. A cut-off valve is provided in the feedback pipe and is movable therein between first and second positions, the cutoff valve blocking the flow of the partially combusted fuels in the first position and permitting the flow of the latter in the second position. The cut-off valve is electromagnetically controlled by an activating circuit which controls the position of the cut-off valve under different predetermined operating conditions of the combustion engine or the vehicle driven by the combustion engine.
Inventors
- 👤 O Glockler
- 👤 D Eichler
- 👤 W Gansert
- 👤 W Soll
- 👤 H Eisele
- 👤 P Schulzke
- 👤 E Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F02D41/02; F02D41/18; F02D41/182; F02D9/00; F02M; F02M1/00; G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/28; F02D2700/00; F02D2700/02; F02D2700/0202; F02D2700/0215; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/434; F02M2700/4342; F02M2700/4345; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
388 words
In an internal combustion engine having inlet means and outlet means, an apparatus for regulating the recycling of partially combusted fuels from said outlet means to said inlet means; valve means provided in said feedback conduit means for regulating the passage of said partially combusted fuels through said feedback conduit means; and activating means for controlling said valve means as a function of a predetermined operating condition of said internal combustion engine, wherein said valve means comprises a cut-off valve movable between first and second positions, said cut-off valve blocking the flow of partially combusted fuels in said first position and permitting the flow of the latter in said second position; and electromagnetic means for moving said cut-off valve from one of said positions to the other, wherein said inlet means comprises an intake manifold and a movably mounted control element in said intake manifold so constructed and mounted as to assume different predetermined positions in dependence upon at least said one operating condition of said engine, and further comprising switch means coupled to said control element for activation in dependence upon the position of said control element, said switch means being connected to said activating means, the latter being connected to said electromagnetic means for influencing the position of said cut-off valve in response to predetermined positions of said control element, wherein said switch means comprises first and second switches, each switch having a pre-set condition which causes said activating means to influence said electromagnetic means to maintain said cut-off valve in said first position, said pre-set conditions for each switch being attainable by movement of said control element to predetermined positions, said first switch only attaining said pre-set condition when said control element is in a position corresponding to idling of said engine, and said second switch only attaining said pre-set condition when said control element is in a position corresponding to full load and near full load operation of said engine, said activating means further comprising threshold means for detecting a preselected threshold level and having input means, wherein said threshold means comprises an electronic threshold circuit having at least one transistor for sensing said preselected threshold level and said input means including a timing element for delaying the action of said one transistor for at least 0.1 seconds on the occurrence of said level.
Claim 2
Dependent Claim
388 words
In an internal combustion engine having inlet means and outlet means, an apparatus for regulating the recycling of partially combusted fuels from said outlet means to said inlet means; valve means provided in said feedback conduit means for regulating the passage of said partially combusted fuels through said feedback conduit means; and activating means for controlling said valve means as a function of a predetermined operating condition of said internal combustion engine, wherein said valve means comprises a cut-off valve movable between first and second positions, said cut-off valve blocking the flow of partially combusted fuels in said first position and permitting the flow of the latter in said second position; and electromagnetic means for moving said cut-off valve from one of said positions to the other, wherein said inlet means comprises an intake manifold and a movably mounted control element in said intake manifold so constructed and mounted as to assume different predetermined positions in dependence upon at least said one operating condition of said engine, and further comprising switch means coupled to said control element for activation in dependence upon the position of said control element, said switch means being connected to said activating means, the latter being connected to said electromagnetic means for influencing the position of said cut-off valve in response to predetermined positions of said control element, wherein said switch means comprises first and second switches, each switch having a pre-set condition which causes said activating means to influence said electromagnetic means to maintain said cut-off valve in said first position, said pre-set conditions for each switch being attainable by movement of said control element to predetermined positions, said first switch only attaining said pre-set condition when said control element is in a position corresponding to idling of said engine, and said second switch only attaining said pre-set condition when said control element is in a position corresponding to full load and near full load operation of said engine, said activating means further comprising threshold means for detecting a preselected threshold level and having input means, wherein said threshold means comprises an electronic threshold circuit having at least one transistor for sensing said preselected threshold level and said input means including a timing element for delaying the action of said one transistor for at least 0.1 seconds on the occurrence of said level.
Claim 3
Dependent Claim
150 words
In an internal combustion engine provided with at least one engine cylinder, an air inlet means leading into said engine cylinder, exhaust-gas outlet means leading out of said cylinder for carrying away exhaust gas, fuel-injection means for injecting predetermined quantities of fuel into said engine cylinder, and a throttle valve in said air inlet means for controlling the flow of air through said air inlet means, in combination therewith, feedback conduit means having one end communicating with said exhaust-gas outlet means and having another end communicating with said air inlet means at a location of said air inlet means upstream of the location of said throttle valve; valve means provided in said feedback conduit means for regulating the passage of said partially combusted fuels through said feedback conduit means; and activating means for controlling said valve means as a function of a predetermined operating condition of said internal combustion engine.
Claim 4
Dependent Claim
150 words
In an internal combustion engine provided with at least one engine cylinder, an air inlet means leading into said engine cylinder, exhaust-gas outlet means leading out of said cylinder for carrying away exhaust gas, fuel-injection means for injecting predetermined quantities of fuel into said engine cylinder, and a throttle valve in said air inlet means for controlling the flow of air through said air inlet means, in combination therewith, feedback conduit means having one end communicating with said exhaust-gas outlet means and having another end communicating with said air inlet means at a location of said air inlet means upstream of the location of said throttle valve; valve means provided in said feedback conduit means for regulating the passage of said partially combusted fuels through said feedback conduit means; and activating means for controlling said valve means as a function of a predetermined operating condition of said internal combustion engine.
Claim 5
Dependent Claim
65 words
In an internal combustion engine as define in claim 2, wherein said valve means comprises a cut-off valve movable between first and econd positions, said cut-off valve blocking the flow of partially combusted fuels in said first position and permitting the flow of the latter in said second position; and electromagnetic means for moving said cut-off valve from one of said positions to the other.
Claim 6
Dependent Claim
104 words
In an internal combustion engine as defined in claim 3, wherein said inlet means comprises an intake manifold and movably mounted control means in said intake manifold so constructed and mounted as to assume different predetermined positions in dependence upon at least said one operating condition of said engine, and further comprising switch means coupled to said control means for activation in dependence upon the position of said control element, said switch means being connected to said activating means, the latter being connected to said electromagnetic means for influencing the position of said cutoff valve in response to predetermined positions of said control Means.
Claim 7
Dependent Claim
113 words
In an internal combustion engine as defined in claim 4, wherein said switch means comprises first and second switches, each switch having a pre-set condition which causes said activating means to influence said electromagnetic means to maintain said cutoff valve in said first position, said pre-set conditions for each switch being attainable by the movement of said control means to predetermined positions, said first switch only attaining said pre-set condition when said control means is in a position corresponding to idling of said engine, and said second switch only attaining said pre-set condition when said control means is in a position corresponding to full load and near full load operation of said engine.
Claim 8
Dependent Claim
26 words
In an internal combustion engine as defined in claim 5, wherein said control means comprises said throttle valve, said switches being coupled to said throttle valve.
Claim 9
Dependent Claim
36 words
In an internal combustion engine as defined in claim 5, said control means comprising a movable airflow sensing baffle plate provided in said intake manifold, said switches being controllable by the movement of said baffle plate.
Claim 10
Dependent Claim
21 words
In an internal combustion engine as defined in claim 7, wherein said movable airflow-sensing baffle plate comprises a pivotable flap member.
Claim 11
Dependent Claim
67 words
In an internal combustion engine as defined in claim 5, wherein said electromagnetic means comprises an electromagnetic device having an excitation winding, said activating means comprising a transistor, said switching means being arranged in the base circuit of said transistor, said excitating winding being connected in series with the emitter-collector path of said transistor, said excitation winding winding serving to influence the position of said cutoff valve.
Claim 12
Dependent Claim
78 words
In an internal combution engine as defined in claim 9, wherein each switch has first and second contacts, said first contact being connected to the emitter of said transistor, said activating means further comprising voltage divider means operable under the same supply voltage as the series emitter-collector circuits, said divider means having at least one tap point, the base of said transistor being connected to said tap point, said second contacts being also connected to said divider means.
Claim 13
Dependent Claim
26 words
In an internal combustion engine as defined in claim 10, wherein said activating means further comprises two diodes connecting said second contacts to said divider means.
Claim 14
Dependent Claim
20 words
In an internal combustion engine as defined in claim 11, wherein said divider means comprises at least two series resistances.
Claim 15
Dependent Claim
52 words
In an internal combustion engine as defined in claim 12, wherein said divider means comprises three resistances and a diode connected in series, said divider means having two tap points, said base of said transistor being connected to one tap point and said second contacts being connected to the other tap point.
Claim 16
Dependent Claim
77 words
In an internal combustion engine as defined in claim 9, wherein said activating means has a supply lead, a limiting resistor being connected between the emitter and said lead, and two series connected diodes connected between the base and said lead to thereby form a parallel conduction path to the base-emitter path of said transistor, said two diodes being arranged to conduct currents in the same direction as can flow in the base-emitter path of said transistor.
Claim 17
Dependent Claim
20 words
In an internal combustion engine as defined in claim 7, said throttle valve being located downstream of said control means.
Claim 18
Dependent Claim
25 words
In an internal combustion engine as defined in claim 4, wherein said control means comprises a movable airflow-sensing baffle plate located in said intake manifold.
Claim 19
Dependent Claim
42 words
In an internal combustion engine as defined in claim 15, wherein said baffle plate and said control means are arranged in spaced relationship in said intake manifold, said feedback conduit means joining the latter between said baffle plate and said control means.
Claim 20
Dependent Claim
34 words
In an internal combustion engine as defined in claim 15, whereiN said feedback conduit means joins said intake manifold upstream of said baffle plate in the direction of air intake through said intake manifold.
Claim 21
Dependent Claim
58 words
In an internal combustion engine as defined in claim 4, further comprising potentiometer means having a movable tap contact arranged to produce variable voltage levels said control means being connected to said tap contact for sharing movement therewith; and treshold means connected to said tap contact for responding to at least one predetermined level of said variable voltage.
Claim 22
Dependent Claim
38 words
In an internal combustion engine as defined in claim 5, said activating means further comprising threshold means for detecting a preselected threshold level and having input means, said first and second switches being connected to said input means.
Claim 23
Dependent Claim
25 words
In an internal combustion engine as defined in claim 1, said threshold circuit comprising two transistors, positive feedback coupling being used to connect said transistors.
Claim 24
Dependent Claim
42 words
In an internal combustion engine as defined in claim 21, wherein the emitters of said two transistors are connected to one another, said threshold circuit further comprising an emitter resistance connecting said connected emitters with a voltage supply lead of said circuit.
Claim 25
Dependent Claim
30 words
In an internal combustion engine as defined in claim 22, said threshold circuit further comprising base resistances connecting each of the bases of said two transistors with said supply lead.
Claim 26
Dependent Claim
34 words
In an internal combustion engine as defined in claim 22, said threshold circuit further comprising a direct feedback coupling component connecting the collector of said one transistor and the base of the other transsistor.
Claim 27
Dependent Claim
16 words
In an internal combustion engine as defined in claim 24, wherein said component is a resistance.
Claim 28
Dependent Claim
53 words
In an internal combustion engine as defined in claim 24, said threshold circuit further comprising a divider circuit connected between the voltage supply leads and having a tap point, the base of said one transistor being connected to said tap point, and diodes connecting said first and second switches to said tap point.
Claim 29
Dependent Claim
39 words
In an internal combustion engine as defined in claim 26, said threshold circuit further comprising temperature sensitive switch means sensitive to the operating temperature of said engine; and a diode connecting said temperature sensitive switch to said tap point.
Claim 30
Dependent Claim
30 words
In an internal combustion engine as defined in claim 26, said threshold circuit further comprising sensitive switch means; and a diode connecting said sensitive switch means to said tap point.
Claim 31
Dependent Claim
24 words
In an internal combustion engine as defined in claim 28, wherein said sensitive switch means is sensitive to the speed of said combustion engine.
Claim 32
Dependent Claim
28 words
In an internal combustion engine as defined in claim 28, wherein said sensitive switch means is sensitive to the speed of the vehicle powered by said combustion engine.
Claim 33
Dependent Claim
32 words
In an internal combustion engine as defined in claim 28, wherein said sensitive switch means is sensitive to the operating conditions of the transmission of the vehicle powered by said combustion engine.
Claim 34
Dependent Claim
30 words
In an internal combustion engine as defined in claim 1, wherein said timing element comprises at least a capacitor connected in parallel with the emitter-base path of said one transistor.
Claim 35
Dependent Claim
22 words
In an internal combustion engine as defined in claim 32, wherein said switches are connected to the base of said one transistor.
References Cited (Backward Citations)
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |