US3728993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection apparatus including an air sensor and means for the direction-dependent damping of its movement
Assignee: Robert Bosch GmbH
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Filing: 1971-12-16
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Granted: 1973-04-24
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Expires: 1991-12-16
Abstract
Abstract In a fuel injection apparatus - in which the air-fuel ratio is maintained constant by an air sensor displaceable in the suction tube by the intake air drawn into the internal combustion engine with which the fuel injection apparatus is associated - in order to prevent undesired shifts in the metered fuel quantities in the low rpm range, the pressurized liquid used as a return force for the air sensor passes through a throttle assembly which throttles the liquid flow to an extent dependent upon the direction of flow therethrough.
Inventors
- 👤 K Eckert
- 👤 H Knapp
- 👤 W Sautter
- 👤 V Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:45
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/30; F02M69/36; F02M69/38; F02M69/386; F02M69/16; F02M69/18; F02M69/22; F02M69/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
321 words
In a fuel injection apparatus for introducing metered fuel in the air intake tube of an internal combustion engine, the improvement comprising A. a butterfly valve disposed in said air intake tube for controlling the flow of intake air therein, B. means for arbitrarily varying the position of said butterfly valve, C. an air sensor disposed in said air intake tube spaced from said butterfly valve, said air sensor being displaced to an extent proportionate to the throughgoing air quantities, D. a fuel metering valve having a movable valving member the position of which determining the fuel quantities to be injected, E. means for transmitting the motion of said air sensor to said movable valving member of said fuel metering valve for effecting a metering of fuel quantities proportionate to said air quantities, F. a pressure chamber, G. a pressure conduit connected with said pressure chamber for carrying liquid under pressure thereto and therefrom, H. means for pressurizing said liquid carried by said pressure conduit to said pressure chamber, I. a movable plunger having a work face disposed in said pressure chamber and exposed to the pressure therein, said pressure urging said plunger out of said pressure chamber, said plunger being connected to said means defined in (E) for exerting a return force on said air sensor by virtue of the pressurized liquid in said pressure chamber, said means defined in (E) urging said plunger into said pressure chamber in response to the deflecting forces exerted on said air sensor and J. a throttle assembly arranged between said pressure conduit and said pressure chamber to restrict the flow of said liquid to and from said pressure chamber, said throttle assembly including direction-dependent means for throttling the flow of said liquid to a smaller extent in a direction from said pressure conduit to said pressure chamber and to a greater extent in a direction from said pressure chamber to said pressure conduit.
Claim 2
Dependent Claim
321 words
In a fuel injection apparatus for introducing metered fuel in the air intake tube of an internal combustion engine, the improvement comprising A. a butterfly valve disposed in said air intake tube for controlling the flow of intake air therein, B. means for arbitrarily varying the position of said butterfly valve, C. an air sensor disposed in said air intake tube spaced from said butterfly valve, said air sensor being displaced to an extent proportionate to the throughgoing air quantities, D. a fuel metering valve having a movable valving member the position of which determining the fuel quantities to be injected, E. means for transmitting the motion of said air sensor to said movable valving member of said fuel metering valve for effecting a metering of fuel quantities proportionate to said air quantities, F. a pressure chamber, G. a pressure conduit connected with said pressure chamber for carrying liquid under pressure thereto and therefrom, H. means for pressurizing said liquid carried by said pressure conduit to said pressure chamber, I. a movable plunger having a work face disposed in said pressure chamber and exposed to the pressure therein, said pressure urging said plunger out of said pressure chamber, said plunger being connected to said means defined in (E) for exerting a return force on said air sensor by virtue of the pressurized liquid in said pressure chamber, said means defined in (E) urging said plunger into said pressure chamber in response to the deflecting forces exerted on said air sensor and J. a throttle assembly arranged between said pressure conduit and said pressure chamber to restrict the flow of said liquid to and from said pressure chamber, said throttle assembly including direction-dependent means for throttling the flow of said liquid to a smaller extent in a direction from said pressure conduit to said pressure chamber and to a greater extent in a direction from said pressure chamber to said pressure conduit.
Claim 3
Dependent Claim
69 words
An improvement as defined in claim 1, said throttle assembly including A. a movable throttle plate exposed to said liquid to assume a first position in response to the liquid flow in a direction from said pressure conduit to said pressure chamber and to assume a second position in response to the liquid flow iN a direction from said pressure chamber to said pressure conduit, said throttle plate having
Claim 4
Dependent Claim
27 words
a continuously open relatively small throttle opening and B. stationary wall means blocking said relatively large throttle opening in said second position of said movable throttle plate.
Claim 5
Dependent Claim
27 words
a continuously open relatively small throttle opening and B. stationary wall means blocking said relatively large throttle opening in said second position of said movable throttle plate.
Claim 6
Dependent Claim
59 words
a counterbore communicating with said aperture and B. a tongue valve plate having a throttle opening in registry with said counterbore, said tongue valve plate being resiliently urged against said stationary component over said counterbore, said tongue valve plate being adapted to move away from said counterbore by said liquid flowing from said pressure conduit to said pressure chamber.
Claim 7
Dependent Claim
59 words
a counterbore communicating with said aperture and B. a tongue valve plate having a throttle opening in registry with said counterbore, said tongue valve plate being resiliently urged against said stationary component over said counterbore, said tongue valve plate being adapted to move away from said counterbore by said liquid flowing from said pressure conduit to said pressure chamber.
Claim 8
Dependent Claim
129 words
An improvement as defined in claim 1, said throttle assembly including A. a chamber of circular cross section, B. a triangular throttle plate movable in said chamber and having a continuously open, relatively small throttle opening, the contour of said triangular throttle plate and said last-named chamber defining relatively large throttle openings, C. stationary wall means bounding the last-named chamber and D. spring means disposed in the last-named chamber in engagement with said triangular throttle plate, said triangular throttle plate being urged by said spring means into engagement with said stationary wall means for blocking said relatively large throttle openings, said triangular throttle plate being adapted to be moved out of engagement with said stationary wall means by said liquid flowing from said pressure conduit to said pressure chamber.
Claim 9
Dependent Claim
16 words
An improvement as defined in claim 1, said throttle assembly including A. a stationary component having
Claim 10
Dependent Claim
94 words
An improvement as defined in claim 1, said throttle assembly including A. means defining a continuously open, relatively small throttle opening, B. means defining a relatively large throttle opening, C. a valve ball cooperating with said relatively large throttle opening, D. means urging said valve ball into engagement with said means defining said relatively large throttle opening for closing the same, said valve ball being adapted to move away from the last-named means for opening said relatively large throttle opening by means of said liquid flowing from said pressure conduit to said pressure chamber.
Claim 11
Dependent Claim
31 words
An improvement as defined in claim 1, including a regulator assembly means communicating with said pressure conduit for affecting the pressure therein as a function of at least one engine variable.
Claim 12
Dependent Claim
25 words
An improvement as defined in claim 1, said movable valving member of said fuel metering valve and said plunger being one and the same component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |