US4474161A
Expired / Lapsed
US
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Method for mixture formation for mixture-compressing internal combustion engines and fuel supply system for performing the method
Assignee: Robert Bosch GmbH
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Filing: 1982-09-14
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Granted: 1984-10-02
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Expires: 2002-09-14
Abstract
Abstract A method for mixture formation for mixture-compressing internal combustion engines having a turbocharger and a fuel supply system for performing the method. The fuel supply system serves to regulate the fuel-air mixture in accordance with operating parameters of the engine and includes a first fuel supply element disposed upstream of a throttle valve and a second fuel supply element disposed upstream of a compressor. Below the operating temperature of the engine, fuel is fed only via the first fuel supply element. Above the operating temperature of the engine, the feeding of fuel is effected via the first fuel supply element until such time as the charging range begins, at a predetermined intake manifold pressure (p um ), and above this pressure only via the second fuel supply element. The transition from one fuel supply element to the other takes place in accordance with a predetermined timed function. As a result, good fuel preparation and good cylinder filling are attained.
Inventors
- 👤 Heinrich Knapp
- 👤 Manfred Lembke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
F; F02; F02B; F02B37/00; F02D; F02D23/00; F02D23/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
191 words
A method of mixture formation for mixture-compressing internal combustion engines that include an air inlet, an air intake manifold connected to said air inlet, a throttle valve in said intake manifold, a compressor disposed in said intake manifold upstream of said throttle valve, a first fuel injection valve upstream of said throttle valve and a second fuel injection valve upstream of said compressor comprising the steps of activating said first fuel injection valve upon starting said engine for injecting fuel into said intake manifold upstream of said throttle valve until predetermined engine operating parameters have been obtained, activating said second fuel injection valve for injecting fuel into said intake manifold upstream of said compressor upon reaching second predetermined engine operating parameters, simultaneously operating said first fuel injection valve and said second fuel injection valve until reaching third predetermined engine operating parameters, inactivating said first fuel injection valve upon reaching said third predetermined engine operating parameters, and operating said first and second fuel injection valves during predetermined engine operating parameters, wherein only said first fuel injection valve is activated at engine operating parameters at which said engine is below the operating temperature.
Claim 2
Independent Claim
191 words
A method of mixture formation for mixture-compressing internal combustion engines that include an air inlet, an air intake manifold connected to said air inlet, a throttle valve in said intake manifold, a compressor disposed in said intake manifold upstream of said throttle valve, a first fuel injection valve upstream of said throttle valve and a second fuel injection valve upstream of said compressor comprising the steps of activating said first fuel injection valve upon starting said engine for injecting fuel into said intake manifold upstream of said throttle valve until predetermined engine operating parameters have been obtained, activating said second fuel injection valve for injecting fuel into said intake manifold upstream of said compressor upon reaching second predetermined engine operating parameters, simultaneously operating said first fuel injection valve and said second fuel injection valve until reaching third predetermined engine operating parameters, inactivating said first fuel injection valve upon reaching said third predetermined engine operating parameters, and operating said first and second fuel injection valves during predetermined engine operating parameters, wherein only said first fuel injection valve is activated at engine operating parameters at which said engine is below the operating temperature.
Claim 3
Dependent Claim
50 words
A method as defined by claim 1, characterized in that following the attainment of the operating temperature of the engine when the engine is operated below a predetermined intake manifold pressure (p um ) downstream of the compressor, the fuel feeding is effected only via the first fuel supply element.
Claim 4
Dependent Claim
89 words
A method as defined by claim 2, characterized in that the event of a slow increase in engine load from the time the predetermined intake manifold pressure (p um ) is attained, the fuel feeding via the first fuel supply element is reduced in accordance with a predetermined function, and in an adapted manner the fuel feeding via the second fuel second fuel supply element begins and is increased, so that the sum of the fuel quantities fed via both fuel supply elements corresponds to the required fuel quantity.
Claim 5
Dependent Claim
128 words
A method as defined by claim 2, characterized in that in the event of an abrupt acceleration process of the engine, beginning at an operating point below the predetermined intake manifold pressure (p um ) until the attainment of the predetermined intake manifold pressure (p um ), an increased fuel quantity is fed via the first fuel supply element and beyond the attainment of the predetermined intake manifold pressure (p um ) the fuel feeding via the first fuel supply element is reduced in accordance with a predetermined function and the fuel feeding via the second fuel supply element begins and is increased in an adapted manner, so that the sum of the fuel quantities fed by the two fuel supply elements corresponds to the required fuel quantity.
Claim 6
Dependent Claim
48 words
A method as defined by claim 1, characterized in that after the attainment of the engine operating temperature when the engine is operated above a predetermined intake manifold pressure (p um ) downstream of the compressor, the fuel feeding is effected only via the second fuel supply element.
Claim 7
Dependent Claim
104 words
A method as defined by claim 5, characterized in that in the event of a slow reduction of the engine load, from an operating point above the predetermined intake manifold pressure (p um ), the fuel feeding via the second fuel supply element is reduced beyond the point of attainment of the predetermined intake manifold pressure (p um ) in accordance with a predetermined function and the fuel feeding via the second fuel supply element begins and is increased in an adapted manner, so that the sum of the fuel quantities fed by the two fuel supply elements corresponds to the required fuel quantity.
Claim 8
Dependent Claim
118 words
A method as defined by claim 5, characterized in that in the event of an abrupt reduction of engine load from an operating point above the predetermined intake manifold pressure (p um ) until the attainment of the predetermined intake manifold pressure (p um ), a reduced fuel quantity is fed via the second fuel supply element, and beyond the predetermined intake manifold pressure (p um ) the feeding of fuel via the second fuel supply element is reduced and in an adapted manner the fuel feeding via the first fuel supply element begins and is increased, so that the sum of the fuel quantities fed by the two fuel supply elements corresponds to the required fuel quantity.
Claim 9
Dependent Claim
29 words
A method as defined by claim 1, 2, 5, 3, 4, 6 or 7 characterized in that an electromagnetically actuatable fuel injection valve serves as the fuel supply element.
Claim 10
Dependent Claim
55 words
A method as defined by claim 8, characterized in that the fuel pressure present at the first fuel injection valve is regulatable in accordance with the intake manifold pressure (p) between the compressor and the throttle valve, and the fuel pressure present at the second fuel injection valve is regulatable in accordance with atmospheric pressure.
Claim 11
Dependent Claim
83 words
A fuel supply system for mixture-compressing internal combustion engines, comprising an intake manifold, a throttle valve in said intake manifold, a compressor (turbocharger) disposed in said intake manifold upstream of said throttle valve, a first fuel supply element disposed directly upstream of said throttle valve, and a second fuel supply element disposed directly upstream of said compressor, and engine parameter control means for exclusively operating said first fuel supply element when said engine is operating at a temperature below a predetermined operating temperature.
Claim 12
Dependent Claim
83 words
A fuel supply system for mixture-compressing internal combustion engines, comprising an intake manifold, a throttle valve in said intake manifold, a compressor (turbocharger) disposed in said intake manifold upstream of said throttle valve, a first fuel supply element disposed directly upstream of said throttle valve, and a second fuel supply element disposed directly upstream of said compressor, and engine parameter control means for exclusively operating said first fuel supply element when said engine is operating at a temperature below a predetermined operating temperature.
Claim 13
Dependent Claim
62 words
A fuel supply system as defined by claim 10 which includes control means connected to said intake manifold downstream of said compressor which controls said first and second fuel supply elements for feeding fuel into said intake manifold in accordance with the intake manifold pressure (p) downstream of the compressor when said engine is operating at a temperature above a predetermined temperature.
Claim 14
Dependent Claim
33 words
A fuel supply system as defined by claim 11, characterized in that above a predetermined intake manifold pressure (p um ), the fuel feeding is effected only via the second fuel supply element.
Claim 15
Dependent Claim
122 words
A fuel supply system as defined by claim 12, characterized in that in the event of an abrupt reduction in engine load, beginning at an operating point above the predetermined intake manifold pressure (p um ) until the attainment of the predetermined intake manifold pressure (p um ), a reduced fuel quantity is fed via the second fuel supply element, and beyond the predetermined intake manifold pressure (p um ) the feeding of fuel via the second fuel supply element is reduced and in an adapted manner the feeding of fuel via the first fuel supply element begins and is increased, so that the sum of the fuel quantities fed via the two fuel supply elements corresponds to the required fuel quantity.
Claim 16
Dependent Claim
33 words
A fuel supply system as defined by claim 11, characterized in that below a predetermined intake manifold pressure (p um ), the fuel feeding is effected only via the first fuel supply element.
Claim 17
Dependent Claim
90 words
A fuel supply system as defined by claim 14, characterized in that in the event of a slow increase in engine load, beyond the attainment of the predetermined intake manifold pressure (p um ), the fuel feeding via the first fuel supply element is reduced in accordance with a predetermined function, and in an adapted manner the fuel feeding via the second fuel supply element begins and is increased, so that the sum of the fuel quantities fed via the two fuel supply elements corresponds to the required fuel quantity.
Claim 18
Dependent Claim
126 words
A fuel supply system as defined by claim 14, characterized in that in the event of an abrupt acceleration process of the engine, beginning at an operating point below a predetermined intake manifold pressure (p um ) until the attainment of the predetermined intake manifold pressure (p um ), an increased fuel quantity is fed via the first fuel supply element, and beyond the predetermined intake manifold pressure (p um ), the fuel feeding via the first fuel supply element is reduced in accordance with a predetermined function, and the fuel feeding via the second fuel supply element begins and is increased in an adapted manner, so that the sum of the fuel quantities fed by both fuel supply elements corresponds to the required fuel quantity.
Claim 19
Dependent Claim
105 words
A fuel supply system as defined by claim 14, characterized in that in the event of a slow reduction in engine load, beginning at an operating point above the predetermined intake take manifold pressure (p um ), the feeding of fuel via the second fuel supply element is reduced beyond the attainment of the predetermined intake manifold pressure (p um ) in accordance with a predetermined function, and the fuel feeding via the first fuel supply element begins and is increased in an adapted manner, so that the sum of the fuel quantities fed by both fuel supply elements corresponds to the required fuel quantity.
Claim 20
Dependent Claim
33 words
A fuel supply system as set forth in claim 10, 11, 14, 12, 15, 16, 17 or 13, characterized in that an electromagnetically actuatable fuel injection valve serves as the fuel supply element.
Claim 21
Dependent Claim
78 words
A fuel supply system as defined by claim 10, which includes a pressure regulating valve disposed in a fuel supply line leading to the first and second injection valves, the pressure regulating valve regulating the pressure of the fuel flowing to the first injection valve in accordance with the intake manifold pressure (p) between the compressor and the throttle valve and regulating the pressure of the fuel flowing to the second injection valve in accordance with atmospheric pressure.
Claim 22
Dependent Claim
65 words
A fuel supply system as defined by claim 19, in which: said pressure regulating valve includes a yielding wall, said yielding wall cooperating with a valve seat, said yielding wall being subjected on one side to the pressure of the fuel in the fuel supply line and being acted upon on another side by a regulating spring and by pressure in a pneumatic control line.
Claim 23
Dependent Claim
66 words
A fuel supply system as defined by claim 20 which includes: a switchover valve disposed in a pneumatic control line, said switchover valve being electromagnetically triggered to connect said pneumatic control line with said intake manifold section between the compressor and the throttle valve when injection is occurring via the first injection valve and with the atmosphere when injection is occurring via the second injection valve.
References Cited (Backward Citations)
US2849992A
Cited
US3541784A
Cited
US3724435A
Cited
US3935847A
Cited
US4182294A
Cited
JPS5672239A
Cited
US4400944A
Cited
JPS57135216A
Cited
EP0074531A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |