Patent US3722490A successfully refreshed from Google Patents.
US3722490A
Expired / Lapsed
US
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Method of and apparatus for injecting fuel into a diesel engine
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1969-10-31
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Granted: 1973-03-27
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Expires: 1989-10-31
Abstract
Abstract A fuel injection system for diesel engine effects a two-stage fuel injection for starting the engine and a single stage fuel injection for operating the engine. During start-up, during each piston cycle, a portion of the fuel is initially injected at a first point during the latter half of the suction stroke and the initial half of the compression stroke of each piston, and an additional amount of the same fuel is subsequently injected at a second point near the end of the same compression stroke of each piston. When the engine has reached a predetermined number of rpms the regular operation of the engine continues with the fuel being injected only in a single stage at approximately the same point in the cycle as the second injection of fuel in the start up procedure.
Inventors
- 👤 A Nishina
- 👤 M Yamaguchi
- 👤 K Araya
- 👤 A Enomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:43
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/447; F01; F01L; F01L13/00; F02M45/00; F02M45/02; F02M45/04; F02M45/06; F02M45/063; F02M59/38; F02M59/42; F01L2760/00; F01L2760/007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A method of starting and operating a diesel engine comprising the steps of effecting a two-stage fuel injection, during starting of the engine, by initially injecting a portion of the fuel at a first point during the latter half of the suction stroke and the initial half of the compression stroke of each piston, and subsequently injecting an additional amount of the same fuel at a second point near the end of the same compression stRoke of each piston; and when the engine has attained a selected operating speed, discontinuing injection of fuel at the first point and thereafter injecting the same fuel at only the second point, in each compression stroke, to effect only a single stage fuel injection during further operation of the engine.
Claim 2
Independent Claim
126 words
A method of starting and operating a diesel engine comprising the steps of effecting a two-stage fuel injection, during starting of the engine, by initially injecting a portion of the fuel at a first point during the latter half of the suction stroke and the initial half of the compression stroke of each piston, and subsequently injecting an additional amount of the same fuel at a second point near the end of the same compression stRoke of each piston; and when the engine has attained a selected operating speed, discontinuing injection of fuel at the first point and thereafter injecting the same fuel at only the second point, in each compression stroke, to effect only a single stage fuel injection during further operation of the engine.
Claim 3
Dependent Claim
283 words
Fuel injection apparatus for a diesel engine, operable to effect a two-stage injection of a single fuel during starting of the engine and only a single-stage injection of the same fuel during running of the engine, said apparatus comprising, in combination, a casing having an axial bore therethrough; a valve at one end of said bore communicating with an engine combustion chamber; a fuel inlet port communicating radially with said bore intermediate the ends of said bore; a substantially cylindrical plunger reciprocable in said bore; driving means engaged with the outer end of said plunger to reciprocate said plunger to draw fuel into said bore through said inlet port and to eject fuel through said valve into the engine combustion chamber; said plunger, in an injection stroke, blocking said fuel inlet port; the inner end of said plunger being higher at one end of a diameter than at the other end of said diameter; and rotating means operable to rotate said plunger between a starting position, in which said higher inner end controls said inlet port, and a running position, in which said lower inner end controls said inlet port; said driving mechanism effecting two reciprocations of said plunger in each cycle, with the second inward stroke of said plunger being longer than the first inward stroke of said plunger and terminating with said lower inner end of said plunger at an inlet port blocking level; each outward stroke of said plunger terminating with said lower inner end of said plunger at an inlet port clearing level; said higher inner end of said plunger, in only said starting position, blocking said inlet port between said first and second inward strokes of said plunger.
Claim 4
Dependent Claim
283 words
Fuel injection apparatus for a diesel engine, operable to effect a two-stage injection of a single fuel during starting of the engine and only a single-stage injection of the same fuel during running of the engine, said apparatus comprising, in combination, a casing having an axial bore therethrough; a valve at one end of said bore communicating with an engine combustion chamber; a fuel inlet port communicating radially with said bore intermediate the ends of said bore; a substantially cylindrical plunger reciprocable in said bore; driving means engaged with the outer end of said plunger to reciprocate said plunger to draw fuel into said bore through said inlet port and to eject fuel through said valve into the engine combustion chamber; said plunger, in an injection stroke, blocking said fuel inlet port; the inner end of said plunger being higher at one end of a diameter than at the other end of said diameter; and rotating means operable to rotate said plunger between a starting position, in which said higher inner end controls said inlet port, and a running position, in which said lower inner end controls said inlet port; said driving mechanism effecting two reciprocations of said plunger in each cycle, with the second inward stroke of said plunger being longer than the first inward stroke of said plunger and terminating with said lower inner end of said plunger at an inlet port blocking level; each outward stroke of said plunger terminating with said lower inner end of said plunger at an inlet port clearing level; said higher inner end of said plunger, in only said starting position, blocking said inlet port between said first and second inward strokes of said plunger.
Claim 5
Dependent Claim
45 words
A fuel injection apparatus, as claimed in claim 2, including means operatively associated with said rotating means and operable, responsive to the engine attaining a predetermined running speed, to activate said rotating means to rotate said plunger from its starting position into its running position.
Claim 6
Dependent Claim
42 words
A fuel injection apparatus, as claimed in claim 2, in which the inner end of said plunger has a stepped formation providing said higher and lower inner ends, each step being substantially semicircular and said steps being spaced axially from each other.
Claim 7
Dependent Claim
44 words
A fuel injection apparatus, as claimed in claim 2, wherein the inner end of said plunger is an oblique surface sloping, at an acute angle to the axis of said plunger, from one end of said diameter to the other end of said diameter.
Claim 8
Dependent Claim
61 words
A fuel injection apparatus, as claimed in claim 3, in which said rotating means comprises a reciprocable rack meshing with gear teeth on said plunger; said operating means for activating said rotating means comprising a lever secured to and extending from said rack; and an engine speed responsive governor coupled to said lever to operate said rack to rotate said plunger.
Claim 9
Dependent Claim
61 words
A fuel injection apparatus, as claimed in claim 2, wherein said operating means comprises a rotatable cam cooperable with the outer end of said plunger and having two cam lobes, of different radial extent, for effecting the respective inward strokes of said plunger; said cam having respective cam surfaces interconnecting said cam lobes and controlling the outward movement of said plunger.
Claim 10
Dependent Claim
46 words
A fuel injection apparatus, as claimed in claim 6, wherein said lever is pivoted intermediate its ends; and a manual control lever connected to said first-mentioned lever and operable to swing said first-mentioned lever to rotate said plunger from said starting position to said running position.
Claim 11
Dependent Claim
69 words
A fuel injection apparatus, as set forth in claim 6, comprising a starting button mounted on said casing, a stop cooperating with said rAck for holding said rack in the operating position, a rack pin mounted on said rack and secured in position by said stop in the operating position and releasable by depressing said button, said rack pin effecting the movement of said rack to the starting position.
Claim 12
Dependent Claim
47 words
A fuel injection apparatus, as set forth in claim 2, comprising an injection conduit connected at one end to said valve, a nozzle secured to the opposite end of said conduit, and a needle valve mounted within said nozzle for injecting the fuel into an engine 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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |