US3815562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure compensated air throttle and air-fuel control system
Assignee: Automotive Engine Associates LP
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Filing: 1973-03-08
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Granted: 1974-06-11
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Expires: 1993-03-08
Abstract
Abstract An air throttle is disclosed which meters a constant airflow for each control position over the range of manifold vacuums encountered in engine operation. Throttle metering area is the product of two perpendicular openings, an x-opening proportional to desired airflow and a y-opening controlled as a function of manifold vacuum to compensate throttle area for variations in manifold vacuum so that airflow for a given x-opening is constant or a desired function over the range of manifold vacuums. If flow per unit area is a function of intake manifold vacuum g(IMV) the y-opening of the throttle is proportional to 1/g(IMV) to maintain constant airflow at a given control setting x. If fuel flow is controlled proportionately to x and an air-fuel ratio function h(IMV) is desired, the throttle will produce it with a y-opening controlled to vary in proportion with h(IMV)/g(IMV).
Inventors
- 👤 M Showalter
- 👤 S Rhine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:41
CPC Classifications
F; F02; F02M; F02M69/00; F02D; F02D9/00; F02M53/00; F02M53/02; F02M9/00; F02M9/12; F02M9/121; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0233
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
In an air-fuel control system for an internal combustion engine, the combination comprising: a. fuel flow control means for supplying fuel to the engine; b. an air intake manifold operated at less than atmospheric pressure; c. a source of air at atmospheric pressure; d. an air throttle connected between said source of air and the intake manifold for controlling airflow to said manifold, said air throttle having a variable flow cross section area; and e. means for controlling the variable flow cross section area wherein said means is responsive to the fuel flow times a function of the pressure drop between the pressure at said air pressure source and the pressure in the intake manifold.
Claim 2
Dependent Claim
115 words
In an air-fuel control system for an internal combustion engine, the combination comprising: a. fuel flow control means for supplying fuel to the engine; b. an air intake manifold operated at less than atmospheric pressure; c. a source of air at atmospheric pressure; d. an air throttle connected between said source of air and the intake manifold for controlling airflow to said manifold, said air throttle having a variable flow cross section area; and e. means for controlling the variable flow cross section area wherein said means is responsive to the fuel flow times a function of the pressure drop between the pressure at said air pressure source and the pressure in the intake manifold.
Claim 3
Dependent Claim
116 words
In an air-fuel control system for an internal combustion engine, the combination comprising: a. fuel flow control means for supplying fuel to the engine; b. an air intake manifold operated at less than atmospheric pressure; c. a source of air at atmospheric pressure; d. an air throttle connected between said source of air and the intake manifold for controlling airflow to said manifold, said air throttle having a variable flow cross section area; and e. means for controlling the variable airflow cross section area wherein said means varies the cross section proportional to the fuel flow times a function of the pressure drop between the pressure of said source and the pressure in said intake manifold.
Claim 4
Dependent Claim
116 words
In an air-fuel control system for an internal combustion engine, the combination comprising: a. fuel flow control means for supplying fuel to the engine; b. an air intake manifold operated at less than atmospheric pressure; c. a source of air at atmospheric pressure; d. an air throttle connected between said source of air and the intake manifold for controlling airflow to said manifold, said air throttle having a variable flow cross section area; and e. means for controlling the variable airflow cross section area wherein said means varies the cross section proportional to the fuel flow times a function of the pressure drop between the pressure of said source and the pressure in said intake manifold.
Claim 5
Dependent Claim
27 words
The invention as set forth in claim 2 and wherein the variable flow cross section area comprises a variable opening formed by adjustable inwardly extending closure members.
Claim 6
Dependent Claim
26 words
The invention as set forth in claim 2 and wherein the variable flow cross section comprises a rectangular opening formed by adustable inwardly extending closure members.
Claim 7
Dependent Claim
40 words
The invention as set forth in claim 4 and wherein the adjustable inwardly extending closure members move in response to the fuel flow and to a function of the pressure difference between atmospheric pressure and that in the intake manifold.
Claim 8
Dependent Claim
58 words
The invention as set forth in claim 3 and wherein the variable opening is a parallelogram having a width and height, wherein said (closure) members control the width of the opening in proportion to fuel flow and the height of the opening as a function of the pressure difference between atmospheric pressure and that in the intake manifold.
Claim 9
Dependent Claim
44 words
The invention as set forth in claim 3 and wherein the means for controlling the adjustable inwardly extending closure members comprises a spring diaphragm control linkage responsive to the pressure drop between the pressure of said source and the pressure in said intake manifold.
Claim 10
Independent Claim
93 words
A method for controlling the air-fuel ratio in an internal combustion engine, said method comprising the steps of: a. controlling the flow of fuel to the engine, b. operating the intake manifold at a pressure less than atmospheric, c. feeding air to the manifold from a source of atmospheric pressure air, and d. controlling the airflow cross sectional area between the source of atmospheric pressure air and the intake manifold to vary said area in proportion to fuel flow times a function of the pressure difference between said manifold pressure and atmospheric pressure.
Claim 11
Independent Claim
93 words
A method for controlling the air-fuel ratio in an internal combustion engine, said method comprising the steps of: a. controlling the flow of fuel to the engine, b. operating the intake manifold at a pressure less than atmospheric, c. feeding air to the manifold from a source of atmospheric pressure air, and d. controlling the airflow cross sectional area between the source of atmospheric pressure air and the intake manifold to vary said area in proportion to fuel flow times a function of the pressure difference between said manifold pressure and atmospheric pressure.
Claim 12
Independent Claim
96 words
A method for controlling the air-fuel ratio in an internal combustion engine, said method comprising the steps of: a. operating the intake manifold at a pressure less than atmospheric, b. controlling the flow of fuel to the engine independently of the pressure of said intake manifold, c. feeding air to the intake manifold from a source of atmospheric pressure air, and d. controlling the airflow cross sectional area between said intake manifold and said source of atmospheric pressure air as a function of fuel flow and the pressure difference between said manifold pressure and atmospheric pressure.
Claim 13
Independent Claim
96 words
A method for controlling the air-fuel ratio in an internal combustion engine, said method comprising the steps of: a. operating the intake manifold at a pressure less than atmospheric, b. controlling the flow of fuel to the engine independently of the pressure of said intake manifold, c. feeding air to the intake manifold from a source of atmospheric pressure air, and d. controlling the airflow cross sectional area between said intake manifold and said source of atmospheric pressure air as a function of fuel flow and the pressure difference between said manifold pressure and atmospheric pressure.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |