Patent US6675017B1 successfully refreshed from Google Patents.
US3908360A
Expired / Lapsed
US
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Pump metering fuel control system
Assignee: Colt Industries Operating Corp
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Filing: 1974-01-14
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Granted: 1975-09-30
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Expires: 1994-01-14
Abstract
Abstract A fuel control system has an electric motor-driven, positive displacement metering pump located in a fuel tank for supplying and metering fuel to an engine. The speed of the motor is determined by an electronic scheduling device which senses various engine parameters and generates a signal indicative of a scheduled fuel flow. A motor control circuit is responsive to the signal from the scheduling device to control the speed of the motor in accordance with the signal''s magnitude. A vapor core pump is in series flow relationship with the positive displacement pump to raise the pressure of the metered fuel to a level required for engine delivery. A throttling type differential pressure regulator is disposed intermediately of the pumps to maintain a constant pressure rise across the positive displacement pump so that fuel flow is a linear function of motor speed, and also to throttle flow to the vapor core pump. Alternatively, the metering pump may be driven by means of a controllable clutch assembly connected to an engine driven shaft.
Inventors
- 👤 Gene A Meyer
- 👤 John S Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/08; F02; F02C; F02C7/00; F02C7/22; F02C7/236; F04B; F04B49/00; F04B49/007; F04B49/06; F04B49/22; F04B49/225; F04C11/00; F04C11/005; F04C11/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A fuel control system for an engine comprising: a computer scheduling section to sense selected engine parameters and to generate a fuel flow signal indicative of a scheduled fuel flow; a positive displacement metering pump for pumping a metered fuel flow to the engine, the fuel flow increasing with the speed of the metering pump; a variable speed drive mechanism drivingly connected to the metering pump to run the metering pump; means for generating a feedback signal indicative of the actual speed of the metering pump; a computer control section, having a summing means, operatively connected to the variable speed drive mechanism for controlling the speed thereof and hence the speed of the pump, the summing means being adapted to receive and sum the fuel flow signal and the feedback signal for generating an error signal; and a throttling type differential pressure regulator operatively connected to the pump for maintaining a substantially constant pressure head across the pump to linearize the relationship between the fuel flow and the pump speed.
Claim 2
Dependent Claim
170 words
A fuel control system for an engine comprising: a computer scheduling section to sense selected engine parameters and to generate a fuel flow signal indicative of a scheduled fuel flow; a positive displacement metering pump for pumping a metered fuel flow to the engine, the fuel flow increasing with the speed of the metering pump; a variable speed drive mechanism drivingly connected to the metering pump to run the metering pump; means for generating a feedback signal indicative of the actual speed of the metering pump; a computer control section, having a summing means, operatively connected to the variable speed drive mechanism for controlling the speed thereof and hence the speed of the pump, the summing means being adapted to receive and sum the fuel flow signal and the feedback signal for generating an error signal; and a throttling type differential pressure regulator operatively connected to the pump for maintaining a substantially constant pressure head across the pump to linearize the relationship between the fuel flow and the pump speed.
Claim 3
Dependent Claim
31 words
The fuel control system of claim 1, wherein the computer scheduling section and the computer control section are electronic components and wherein the variable speed drive mechanism is an electric motor.
Claim 4
Dependent Claim
49 words
The fuel control system of claim 1, further including: a vapor core pump fluidly connected to the metering pump for raising the pressure of the fuel pumped thereby; and wherein the differential pressure regulator is connected to the inlet of the vapor core pump to throttle the flow thereto.
Claim 5
Dependent Claim
19 words
The fuel control system of claim 1, further including: a fuel tank, the positive displacement pump being mounted therein.
Claim 6
Dependent Claim
19 words
The fuel control system of claim 3, further including: a fuel tank, the positive displacement pump being mounted therein.
Claim 7
Dependent Claim
25 words
The fuel control system of claim 5, further including: means to connect the vapor core pump to the engine such that it is driven thereby.
Claim 8
Dependent Claim
88 words
The fuel control system of claim 1, further including: a main fuel supply conduit upstream of the engine for receiving the metered fuel flow; a flow measuring conduit in parallel flow relationship to the main fuel supply conduit; valve means for directing the metered fuel flow to either the main fuel supply conduit or the flow measuring conduit; and a flow meter operatively connected to the flow measuring conduit to generate a signal to the computer indicative of the metered fuel flow for the calibration of the computer.
Claim 9
Dependent Claim
30 words
The fuel control system of claim 7, further including: a barrier filter positioned in the flow measuring conduit upstream of the flow meter for filtering flow to the flow meter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |