US3898969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply systems for engines
Assignee: CAV Ltd
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Filing: 1973-12-28
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Granted: 1975-08-12
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Expires: 1993-12-28
Abstract
Abstract A fuel system for an engine has control means determining the rate of supply of fuel to the engine. This control means is responsive to system parameters, one of which is obtained from a demand transducer. The minimum speed of the engine is limited in accordance with the rate of supply of fuel to be produce an idling curve having a predetermined slope, and this slope is increased if the engine speed is below a predetermined value.
Inventors
- 👤 Malcolm Williams
- 👤 Christopher Robin Jones
- 👤 Richard William Crookes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A fuel supply system for an engine, including control means for determining the rate of fuel supply by the system, a demand transducer for providing a signal to the control means representing a demanded engine operating parameter thereby defining engIne operating curves having a first predetermined slope, means for limiting the minimum speed of the engine in accordance with the rate of supply of fuel to produce an engine idling curve of a second predetermined slope less steep than said first predetermined slope, and means operable when the engine speed falls below a predetermined value for supplementing the input applied to the control means by the demand transducer so as to simulate an increased demand and produce an engine idling curve having a third predetermined slope steeper than said first predetermined slope.
Claim 2
Dependent Claim
132 words
A fuel supply system for an engine, including control means for determining the rate of fuel supply by the system, a demand transducer for providing a signal to the control means representing a demanded engine operating parameter thereby defining engIne operating curves having a first predetermined slope, means for limiting the minimum speed of the engine in accordance with the rate of supply of fuel to produce an engine idling curve of a second predetermined slope less steep than said first predetermined slope, and means operable when the engine speed falls below a predetermined value for supplementing the input applied to the control means by the demand transducer so as to simulate an increased demand and produce an engine idling curve having a third predetermined slope steeper than said first predetermined slope.
Claim 3
Dependent Claim
38 words
A fueld supply system as defined in claim 1, wherein said third predetermined slope is substantially vertical thereby effecting a substantially maximum rate of fuel supply to the engine when said engine speed falls below said predetermined value.
Claim 4
Dependent Claim
56 words
A system as claimed in claim 2 in which the control means comprises a pump supplying fuel to the engine, an actuator controlling the output of the pump, and an electronic governor controlling the actuator, the governor receiving an input from the demand transducer and from at least one further transducer responsive to a system parameter.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |