US3859972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system for an internal combustion engine
Assignee: Bendix Corp
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Filing: 1973-06-28
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Granted: 1975-01-14
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Expires: 1993-06-28
Abstract
Abstract Fuel injection apparatus for an internal combustion engine having a reciprocating piston pressure pump in which separate electro-mechanical control valves are operated to begin and end each fuel injection period in timed relation to rotation of the cam shaft or crank shaft of the internal combustion engine to avoid the need of fast acting magnetic valves.
Inventors
- 👤 Edwin Ben Watson
- 👤 Harlan I Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A fuel injection system for an internal combustion engine having a pumping unit with a plurality of pumping chambers, each chamber having an inlet port, a relief port, and an injection port, the injection port communicating with the engine during an injection period when the relief port is closed, means for supplying fuel to the pumping chambers through the inlet ports, means for pressurizing the fuel in the chambers, and a plurality of electromechanical valves associated with the pumping chambers, and means for providing electrical signals in timed relation to the engine for controlling one valve to close the relief port in a pumping chamber to start an injection period and for controlling another valve to open the relief port in the pumping chamber to end the injection period.
Claim 2
Dependent Claim
129 words
A fuel injection system for an internal combustion engine having a pumping unit with a plurality of pumping chambers, each chamber having an inlet port, a relief port, and an injection port, the injection port communicating with the engine during an injection period when the relief port is closed, means for supplying fuel to the pumping chambers through the inlet ports, means for pressurizing the fuel in the chambers, and a plurality of electromechanical valves associated with the pumping chambers, and means for providing electrical signals in timed relation to the engine for controlling one valve to close the relief port in a pumping chamber to start an injection period and for controlling another valve to open the relief port in the pumping chamber to end the injection period.
Claim 3
Dependent Claim
33 words
A fuel injection system as described in claim 1 in which the number of pumping chambers and the number of valves is equal to the number of cylinders in the internal combustion engine.
Claim 4
Dependent Claim
34 words
A fuel injection system as described in claim 1 in which one valve opens the relief ports in two associated pumping chambers and another valve closes the relief ports in the two pumping chambers.
Claim 5
Dependent Claim
18 words
A fuel injection system as described in claim 1 in which each valve operates at intervals of 180*.
Claim 6
Dependent Claim
36 words
A fuel injection system as described in claim 1 in which the means for pressurizing the fuel in the chambers are reciprocating pistons which periodically pressurize the fuel in the chambers during a fuel injection period.
Claim 7
Dependent Claim
29 words
A fuel injection system as described in claim 1 in which the means for providing electrical signals comprises a distributor operated by a cam shaft in the pumping unit.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |