US3776208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection apparatus for spark plug-ignited internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1971-12-28
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Granted: 1973-12-04
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Expires: 1991-12-28
Abstract
Abstract In a fuel injection apparatus the fuel quantities injected in the associated internal combustion engine are determined as a function of the angular position of a throttle member disposed in the air intake tube of the engine. The angular position of the throttle member, in turn, is variable by an electric follower regulator circuit that includes, in a bridge circuit, a temperature-dependent resistance which is disposed in a channel bypassing the throttle member and which changes its resistance as a function of the velocity and density of the intake air passing through said channel.
Inventors
- 👤 G Stumpp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:22
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/16; F02M69/18; F02M69/22; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; Y; Y10; Y10S; Y10S261/00; Y10S261/74
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
199 words
In a fuel injection apparatus associated with an internal combustion engine having an air intake tube and an arbitrarily movable butterfly valve disposed therein, said apparatus being of the type that includes (a) a channel in communication with said air intake tube and bypassing a portion thereof, (b) means disposed in said channel for sensing the flow of air therein and (c) means for varying the injected fuel quantities in response to a change in the sensed value in said channel for metering fuel quantities in proportion to the air quantities flowing through said air intake tube, the improvement comprising A. a throttle member disposed in a portion of said air intake tube and spaced from said butterfly valve, said channel bypassing said throttle member and B. a follower regulator circuit operatively connected between said means disposed in said channel for sensing the flow of air therein and said throttle member for displacing said throttle member so as to maintain a substantially constant sensed value in said channel, said means disposed in said channel being responsive to velocity and density of air passing through said channel, the position of said throttle member being a measure for metering of fuel.
Claim 2
Dependent Claim
199 words
In a fuel injection apparatus associated with an internal combustion engine having an air intake tube and an arbitrarily movable butterfly valve disposed therein, said apparatus being of the type that includes (a) a channel in communication with said air intake tube and bypassing a portion thereof, (b) means disposed in said channel for sensing the flow of air therein and (c) means for varying the injected fuel quantities in response to a change in the sensed value in said channel for metering fuel quantities in proportion to the air quantities flowing through said air intake tube, the improvement comprising A. a throttle member disposed in a portion of said air intake tube and spaced from said butterfly valve, said channel bypassing said throttle member and B. a follower regulator circuit operatively connected between said means disposed in said channel for sensing the flow of air therein and said throttle member for displacing said throttle member so as to maintain a substantially constant sensed value in said channel, said means disposed in said channel being responsive to velocity and density of air passing through said channel, the position of said throttle member being a measure for metering of fuel.
Claim 3
Dependent Claim
33 words
An improvement as defined in claim 1, said means disposed in said channel being formed of a temperature-dependent resistance for maintaining the product of air velocity and air density constant in said channel.
Claim 4
Dependent Claim
44 words
An improvement as defined in claim 1, including a fuel metering valve having a displaceable fuel rack and a cam track connected to said throttle member and to said fuel rack for displacing the latter in response to the motion of said throttle member.
Claim 5
Dependent Claim
32 words
An improvement as defined in claim 3, said cam track being formed as a three-dimensional cam, said improvement including additional means for displacing said three-dimensional cam in response to an engine variable.
Claim 6
Dependent Claim
78 words
An improvement as defined in claim 1, said follower regulator circuit being formed as an electric regulator circuit, said means disposed in said channel being formed of a temperature-dependent resistance, the conductance of which being varied in response to the product of air velocity and air density in said channel, said improvement further including means for applying electric signals from said resistance to said electric regulator circuit, said electric signals varying in response to changes in said conductance.
Claim 7
Dependent Claim
21 words
An improvment as defined in claim 5, including means for applying to said electric regulator circuit signals characterizing additional engine variables.
Claim 8
Dependent Claim
27 words
An improvement as defined in claim 5, including an electric motor controlled by said electric regulator circuit and connected to said throttle member for displacing the latter.
Claim 9
Dependent Claim
41 words
An improvement as defined in claim 5, said electric regulator circuit being formed as a bridge circuit, said temperature-dependent resistance constituting a branch of said bridge circuit, the improvement further including a regulator forming the diagonal branch of said bridge circuit.
Claim 10
Dependent Claim
24 words
An improvement as defined in claim 8, including further resistances forming part of said bridge circuit and being variable in response to engine parameters.
Claim 11
Dependent Claim
160 words
In a method of injecting fuel in an internal combustion engine of the type having an air intake tube and an arbitrarily movable butterfly valve disposed therein, said method including the known steps of (a) measuring the flow of intake air in said tube by sensing the air flow in a channel bypassing a portion of said air intake tube and (b) varying the metered fuel quantities in response to the variation of the value sensed in said channel, the improvement comprising the steps of A. varying the flow passage section of said portion of said air intake tube in response to a change of the air flow in said channel so as to maintain in the latter a predetermined constant measured value and B. varying the metered fuel quantities in response to the variation of the flow passage section of said portion, C. and wherein said measuring step involves sensing velocity and density of air passing through said channel.
Claim 12
Dependent Claim
160 words
In a method of injecting fuel in an internal combustion engine of the type having an air intake tube and an arbitrarily movable butterfly valve disposed therein, said method including the known steps of (a) measuring the flow of intake air in said tube by sensing the air flow in a channel bypassing a portion of said air intake tube and (b) varying the metered fuel quantities in response to the variation of the value sensed in said channel, the improvement comprising the steps of A. varying the flow passage section of said portion of said air intake tube in response to a change of the air flow in said channel so as to maintain in the latter a predetermined constant measured value and B. varying the metered fuel quantities in response to the variation of the flow passage section of said portion, C. and wherein said measuring step involves sensing velocity and density of air passing through said channel.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |