US3651791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling fuel supply to an internal combustion engine
Assignee: Denso Corp
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Filing: 1970-06-18
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Granted: 1972-03-28
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Expires: 1990-06-18
Abstract
Abstract A system for controlling fuel supply to an internal combustion engine having a device for sensing pressure within an intake manifold of the engine. The device has bellows operable in response to variation in absolute pressure value within the intake manifold in normal operation of the engine to cause a core to move relative to an electrical coil so that electrical signals are emitted to cause the amount of fuel supply to be controlled in accordance with the state of engine operation represented by the pressure within the intake manifold. The device also has a diaphragm operable in response to variation in pressure differential of more than a predetermined value between the pressure within the intake manifold and the atmospheric pressure to displace normal operative position of the bellows relative to the coil in a direction in which the amount of fuel supply is increased, said predetermined value of the pressure differential being set to represent the state of engine operation which requires a greater output to be produced by the engine.
Inventors
- 👤 Hisanori Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/005; F02M51/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
306 words
A device for controlling the fuel supply into an internal combustion engine, said device including a housing defining a substantially hermetically closed space therein, means within said housing sensitive to the variation in the absolute pressure value within the intake manifold of said engine, means within said housing operable in response to the pressure differential of more than a predetermined value between the pressure within said intake manifold and the atmospheric pressure so as to be displaced in one direction into mechanical connection with said absolute pressure variation sensitive means, and means for transducing the operation of said absolute pressure variation sensitive means and the displacement thereof by said pressure differential responsive means into electrical signals which are utilized to control the fuel supply to said engine, characterized by the features that said absolute pressure variation sensitive means comprise at least one bellows member, said differential pressure responsive means including a diaphragm member dividing said closed space in said housing into two chambers one of which is in communication with the interior of said intake manifold, the other chamber being open to the atmosphere, said bellows member being disposed within said one chamber, said differential pressure responsive means also including a spring member in engageMent with said diaphragm, said spring member being preloaded so as to resiliently displace said diaphragm member in the other direction when said pressure differential is less than said predetermined value, and that there are provided a second spring member biasing said bellows member in said the other direction to cause the same to follow the displacement of said diaphragm member in said the other direction for thereby shifting the normal operative position of said bellows member in said the other direction, and stop means for limiting the displacement of said diaphragm member and said bellows member in said the other direction.
Claim 2
Independent Claim
306 words
A device for controlling the fuel supply into an internal combustion engine, said device including a housing defining a substantially hermetically closed space therein, means within said housing sensitive to the variation in the absolute pressure value within the intake manifold of said engine, means within said housing operable in response to the pressure differential of more than a predetermined value between the pressure within said intake manifold and the atmospheric pressure so as to be displaced in one direction into mechanical connection with said absolute pressure variation sensitive means, and means for transducing the operation of said absolute pressure variation sensitive means and the displacement thereof by said pressure differential responsive means into electrical signals which are utilized to control the fuel supply to said engine, characterized by the features that said absolute pressure variation sensitive means comprise at least one bellows member, said differential pressure responsive means including a diaphragm member dividing said closed space in said housing into two chambers one of which is in communication with the interior of said intake manifold, the other chamber being open to the atmosphere, said bellows member being disposed within said one chamber, said differential pressure responsive means also including a spring member in engageMent with said diaphragm, said spring member being preloaded so as to resiliently displace said diaphragm member in the other direction when said pressure differential is less than said predetermined value, and that there are provided a second spring member biasing said bellows member in said the other direction to cause the same to follow the displacement of said diaphragm member in said the other direction for thereby shifting the normal operative position of said bellows member in said the other direction, and stop means for limiting the displacement of said diaphragm member and said bellows member in said the other direction.
Claim 3
Dependent Claim
30 words
A device as defined in claim 1, in which said stop means is an adjusting screw member threadably extending through the wall of said housing into said the other chamber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |