Patent US3720212A successfully refreshed from Google Patents.
US4883032A
Expired / Lapsed
US
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In-cylinder control of particulates and nitric oxide for diesel engine
Assignee: Ford Global Technologies LLC
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Filing: 1989-01-23
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Granted: 1989-11-28
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Expires: 2009-01-23
Abstract
Abstract A method using concurrently and simultaneously certain control factors for in-cylinder combustion, at least two of such factors being at levels never tried before by the prior art. The combination of control factors comprises: (i) high pressure charging of supply air for enhanced excess oxygen; (ii) advanced techniques for improved in-cylinder mixing of fuel and air (i.e., high swirl, reentraining piston bowl configuration, high compression ratio); (iii) high pressure injection of diesel fuel at levels of 16-22×10 3 psi; (iv) smaller fuel nozzle ports for creating finer droplet size; (v) retardation of fuel injection from TDC by 2°-5°; and (vi) limitation of the ingress of lubrication oil into the combustion chamber by use of noncompressed cylinder sleeves to enhance piston to bore concentricity and preferably by other augmenting limits.
Inventors
- 👤 Charles E. Hunter
- 👤 Harry A. Cikanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:19
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0672; F02B23/0636; F02B3/00; F02B3/06; F02B31/00; F02B2275/00; F02B2275/14; F02B2275/40; F02B23/0618; F02B23/0621; F02B23/0645; F02B23/0654; F02B23/0657; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
A method of providing simultaneous and concurrent in-cylinder control of the formation of particulates and nitric oxide during the combustion cycle of direct-injected diesel fuel and pressure charged air in a combustion chamber of a heavy duty diesel engine, the combustion chamber being (i) defined in part by a piston crown separated by a supply of lubricating oil by piston rings and (ii) employing accepted advanced combustion techniques for introducing, distributing and compressing said fuel and air comprising the steps of: (a) injecting said diesel fuel at a pressure equal to or greater than 16×10 3 psi through injector ports having a diameter of less than 0.22 mm; (b) retarding the start of fuel injection from TDC by 2°-5°, and (c) limiting ingress of lubricating oil into said combustion chamber by increasing the piston ring to cylinder bore concentricity through the use of noncompressed cylinder sleeves defining said cylinder bore.
Claim 2
Independent Claim
150 words
A method of providing simultaneous and concurrent in-cylinder control of the formation of particulates and nitric oxide during the combustion cycle of direct-injected diesel fuel and pressure charged air in a combustion chamber of a heavy duty diesel engine, the combustion chamber being (i) defined in part by a piston crown separated by a supply of lubricating oil by piston rings and (ii) employing accepted advanced combustion techniques for introducing, distributing and compressing said fuel and air comprising the steps of: (a) injecting said diesel fuel at a pressure equal to or greater than 16×10 3 psi through injector ports having a diameter of less than 0.22 mm; (b) retarding the start of fuel injection from TDC by 2°-5°, and (c) limiting ingress of lubricating oil into said combustion chamber by increasing the piston ring to cylinder bore concentricity through the use of noncompressed cylinder sleeves defining said cylinder bore.
Claim 3
Dependent Claim
22 words
The method as in claim 1, in which said pressure charged air is turbocharged at pressures greater than 46 inches of mercury.
Claim 4
Dependent Claim
47 words
The method as in claim 1, in which said accepted advanced combustion techniques comprise: (a) use of a reentrant bowl configuration in the crown of said piston; (b) use of an inlet for said air to promote high swirl; and (c) a compression ratio greater than 18:1.
Claim 5
Dependent Claim
20 words
The method as in claim 3, in which said high swirl is characterized by a swirl ratio of about 2.0.
Claim 6
Dependent Claim
24 words
The method as in claim 3, in which said accepted advance combustion techniques further comprise use of low sulphur and low aromatic diesel fuel.
Claim 7
Dependent Claim
36 words
The method as in claim 1, in which said limiting of step (c) is further augmented by honing the mating diameters of said cylinder sleeves and pistons to be accurate within a tolerance of 0.0005 inches.
Claim 8
Dependent Claim
23 words
The method as in claim 1, in which said limiting of step (c) is further augmented by increasing the piston ring tangential tension.
Claim 9
Dependent Claim
31 words
The method as in claim 1, in which said limiting of said step (c) is further augmented by increasing the lubricating the oil viscosity to be by at least one weight.
Claim 10
Dependent Claim
22 words
The method as in claim 1, in which said limiting of step (c) is further augmented by use of wet cylinder sleeves.
Claim 11
Dependent Claim
30 words
The method as in claim 4, in which said diesel fuel has a sulphur content less than 0.05 weight percent and an aromatic content of 11 weight percent or less.
Claim 12
Dependent Claim
19 words
The method as in claim 1, in which said injected pressure is achieved by use of a unit injector.
Claim 13
Dependent Claim
20 words
The method as in claim 1, in which said injector ports have a diameter in the range of 0.14-0.18 mm.
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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |