US3844265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for regulating the amount of fuel injected by injection systems of internal combustion engines
Assignee: Fiat Auto SpA
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Filing: 1972-02-24
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Granted: 1974-10-29
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Expires: 1992-02-24
Abstract
Abstract A device for regulating the amount of injected fuel in injection systems of internal combustion engines, of the kind provided with a spatial cam and a follower, the spatial cam having two degrees of freedom whereas the follower has an additional degree of freedom, means for controlling the displacements of the points of contact of the cam with the follower along a first direction and second means for controlling the relative displacements of said points of contact along a second direction, in which said first named means are an electrical-mechanical transducer having its input associated with the engine mainshaft and a second transducer having its input electrically connected to the output of the first transducer and the output mechanically connected to either of said cam or said follower.
Inventors
- 👤 F Surace
- 👤 E Rogora
- 👤 A Bassi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:38
CPC Classifications
F; F02; F02D; F02D1/00; F02D1/02; F02D1/08; F02D1/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
323 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device so as to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contact of the follower with the cam surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of injected fuel as a function of the position of said point of contact with respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine operation of the throttle angle, the improvement that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member.
Claim 2
Independent Claim
323 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device so as to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contact of the follower with the cam surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of injected fuel as a function of the position of said point of contact with respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine operation of the throttle angle, the improvement that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member.
Claim 3
Dependent Claim
66 words
The regulation device according to claim 1, characterized in that said second control means are sensitive to the throttle angle and the spatial cam, the follower, said second control means and the second transducer are consolidated into a single unit which is mechanically connected to the body which contains the throttle(s), the connection between the body and the engine being made of a resiliently deformable material.
Claim 4
Independent Claim
413 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contacts of the follower with the cam surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of the injected fuel as a function of the position of said point of contact with respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine operation of the throttle angle, the improvement being that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member, a variable volume chamber, a feed of pressurized fluid, a discharge, duct means respectively connecting the chamber with the feed and discharge, said second transducer consisting of the variable-volume chamber connected to the feed of pressurized fluid and to the discharge through said duct means, and means sensitive to the algebraic sign of the difference between the speed electric signal emitted by the first transducer and a reference signal controlling said duct means, so that the duct means be opened alternatively as a function of the sign of said difference.
Claim 5
Independent Claim
413 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contacts of the follower with the cam surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of the injected fuel as a function of the position of said point of contact with respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine operation of the throttle angle, the improvement being that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member, a variable volume chamber, a feed of pressurized fluid, a discharge, duct means respectively connecting the chamber with the feed and discharge, said second transducer consisting of the variable-volume chamber connected to the feed of pressurized fluid and to the discharge through said duct means, and means sensitive to the algebraic sign of the difference between the speed electric signal emitted by the first transducer and a reference signal controlling said duct means, so that the duct means be opened alternatively as a function of the sign of said difference.
Claim 6
Dependent Claim
43 words
The regulation device according to claim 3, characterized in that it comprises means which produce said reference signal as a function of the relative displacement of the point of contact with respect to the cam surface along the first of the directions aforementioned.
Claim 7
Dependent Claim
36 words
The regulation device according to claim 3 characterized in that said chamber is a variable-volume chamber because one of its walls is movable, resilient means being provided which counteract the forces exerted by the pressurized fluid.
Claim 8
Dependent Claim
52 words
The regulation device according to claim 3, characterized in that said chamber is a variable volume chamber because one of its walls is movable the forces exerted on said wall by the pressurized fluid being counteracted by the force originated by the existance of a constant pressure in a second variable-volume chamber.
Claim 9
Dependent Claim
28 words
The regulation device according to claim 5, characterized in that in said variable volume chambers the movable wall is formed at least in part by a deformable diaphragm.
Claim 10
Dependent Claim
33 words
The regulation device according to claim 6, characterized in that the movable wall of the first chamber has a surface which is higher than that of the movable wall of the second chamber.
Claim 11
Dependent Claim
40 words
The regulation device according to claim 7, characterized in that the non-deformable portion of at least one of the movable walls acts by means of a rod on the arm of a displacement-multiplying lever mechanically connected to the spatial cam.
Claim 12
Dependent Claim
47 words
The regulation device according to claim 9, characterized in that the rod associated with the diaphragm of the first chamber acts on said lever at a distance from the pivotal point which is greater than that of the rod associated to the diaphragm of the second chamber.
Claim 13
Independent Claim
320 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device so as to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contact of the follower with the same surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of injected fuel as a function of the position of said point of contact wiTh respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine intake pressure, the improvement that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member.
Claim 14
Independent Claim
320 words
A device for regulating the amount of injected fuel for injection systems of internal combustion engines, comprising a first member defined by a spatial cam and a second member defined by a follower maintained in engagement with the spatial cam surface, said two members being connected to the body of the device so as to allow two degrees of freedom in total to said two members, the follower being allowed an additional degree of freedom so as to be allowed to carry out displacements in the direction of the cam rises, said two degrees of freedom permitting relative displacements of the point of contact of the follower with the same surface along two corresponding directions which are perpendicular to one another and perpendicular to the cam rises, said follower acting on component parts of the injection system which are enabled to vary the amount of injected fuel as a function of the position of said point of contact wiTh respect to the cam surface, first means controlling, as a function of the engine speed of rotation, the relative displacement of the point of contact with respect to the cam surface along the first of the two directions, and second means controlling the relative displacement along the second of the two directions as a function of a parameter representative of the engine intake pressure, the improvement that said first means comprise a first mechanical-electrical transducer, a second electrical-mechanical transducer, a feed-back unit consisting of a third mechanical-electrical transducer and of a comparison element, the input of the first transducer being mechanically coupled to the mainshaft and its output being electrically connected to the comparison element, the input of the third transducer being mechanically coupled to said first member and its output being electrically coupled to said comparison element, the input of said second transducer being electrically coupled to the comparison element, while the output is mechanically coupled to said first member.
Claim 15
Dependent Claim
49 words
The regulation device according to claim 11 characterized in that said second control means are sensitive to the pressure in the intake duct and the spatial cam, the follower, said second control means are consolidated into a single unit placed in a desired position with respect to the engine.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |