US4974571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed jet combustion generator for non-premixed charge engines
Assignee: University of California
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Filing: 1989-02-24
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Granted: 1990-12-04
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Expires: 2009-02-24
Abstract
Abstract A device for introducing fuel into the head space of cylinder of non-premixed charge (diesel) engines is disclosed, which distributes fuel in atomized form in a plume, whose fluid dynamic properties are such that the compression heated air in the cylinder head space is entrained into the interior of the plume where it is mixed with and ignites the fuel in the plume interior, to thereby control combustion, particularly by use of a multiplicity of individually controllable devices per cylinder.
Inventors
- 👤 A. K. Oppenheim
- 👤 H. E. Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:54
CPC Classifications
F; F02; F02M; F02M67/00; F02M67/10; F02M67/12; F02M51/00; F02M51/06; F02M51/061; F02M61/00; F02M61/16; F02M61/162; F02M67/02; F02M67/04; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
153 words
A device for introducing atomized fuel into the head space of a cylinder of a non-premixed charge engine for controlled ignition and combustion of the fuel by compression heated air, which comprises: means for generating and intermittently injecting into said head space during a time interval at the end of the compression stroke of said engine, a stream of air at a velocity and volume productive of a plume in said compression heated air, whose fluid dynamic structure causes entrainment and mixing of said compression heated air in the interior of said plume: means for introducing liquid fuel into said stream of air so that it is sheared into fine droplets and carried by said stream of air into said head space; to thereby react with said compression heated air in the interior of said plume and causing said plume to expand to fill a part of the volume of said head space.
Claim 2
Independent Claim
153 words
A device for introducing atomized fuel into the head space of a cylinder of a non-premixed charge engine for controlled ignition and combustion of the fuel by compression heated air, which comprises: means for generating and intermittently injecting into said head space during a time interval at the end of the compression stroke of said engine, a stream of air at a velocity and volume productive of a plume in said compression heated air, whose fluid dynamic structure causes entrainment and mixing of said compression heated air in the interior of said plume: means for introducing liquid fuel into said stream of air so that it is sheared into fine droplets and carried by said stream of air into said head space; to thereby react with said compression heated air in the interior of said plume and causing said plume to expand to fill a part of the volume of said head space.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein said gaseous medium comprises air at a temperature below that of the piston-compressed air into which it is injected.
Claim 4
Dependent Claim
14 words
The device of claim 2 wherein the air is cooled by about 300° C.
Claim 5
Dependent Claim
26 words
The device of claim 1, wherein said stream of gaseous medium is swirling, and said liquid fuel is introduced into said stream in a counter-swirling direction.
Claim 6
Dependent Claim
27 words
The device of claim 4, wherein said stream of gaseous medium and said liquid fuel flow in substantially orthogonal directions within the orifice region of said nozzle.
Claim 7
Dependent Claim
30 words
The device of claim 1, further defined, in that it comprises pintle valve means for intermittently opening and closing the orifice of said device with respect to said head space.
Claim 8
Dependent Claim
25 words
The device of claim 6, which includes electro-mechanical means for actuating the opening and closing of said pintle in response to timed microprocessor electrical commands.
Claim 9
Dependent Claim
13 words
The device of claim 7, wherein said electro-mechanical means is a solenoid actuator.
Claim 10
Dependent Claim
53 words
The device of claim 1, including means for independently actuating said means for introducing said liquid fuel into said gaseous medium to permit limiting the supply of fuel supply time to periods when both the pintle valve is open and the air supply is turned on to prevent the formation of large droplets.
Claim 11
Dependent Claim
55 words
The device of claim 9, wherein said means for independently actuating said means for introducing said liquid fuel comprises a three-way solenoid valve capable of switching the supply of fuel between a fuel dump and said device for introducing said fuel into said gas stream, in response to timed electronic signals issued by a microprocessor.
Claim 12
Dependent Claim
73 words
The device of claim 10, wherein said means for generating said stream of said medium comprises means for withdrawing compression heated air from said cylinder, means for cooling said air, to a temperature below the final temperature of said compression heated air in the head space of said cylinder, and means for intensifying the pressure of said air to a pressure sufficient to cause the formation of a jet productive of said plumes.
Claim 13
Dependent Claim
27 words
The device of claim 11, further defined in that said means for intensifying the pressure of said air comprises a piston apparatus capable of being hydraulically actuated.
Claim 14
Dependent Claim
16 words
The device of claim 12, wherein said piston apparatus is pneumatically actuated by engine oil pressure.
Claim 15
Dependent Claim
22 words
The device of claim 12, including electromechanical valve means for actuating said piston apparatus in response to timed microprocessor issued electrical signals.
Claim 16
Dependent Claim
21 words
The device of claim 1, including means for introducing into said fuel metered quantities of fuel additives for modulating combustion reaction.
Claim 17
Dependent Claim
15 words
The device of claim 5, wherein said fuel additives are compounds capable of accelerating combustion.
Claim 18
Dependent Claim
16 words
The device of claim 16, wherein said fuel additives are compounds capable of decelerating combustion reactions.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |