US5249560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for operating automotive internal combustion engine during start-up
Assignee: Ford Global Technologies LLC
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Filing: 1991-12-13
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Granted: 1993-10-05
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Expires: 2011-12-13
Abstract
Abstract A system and method for operating an automotive internal combustion engine during start-up includes steps of sampling at least one operating parameter of the engine, comparing the sampled parameter to a predetermined range for such parameter, and in the event that the sampled parameter falls outside of the predetermined range, operating some of the engine's cylinders according to a base fuel schedule, while reducing the time-averaged amount of fuel provided to the remaining cylinders. Once the sampled parameter falls within the predetermined range, all cylinders of the engine will be operated according to the same fuel schedule.
Inventors
- 👤 David J. Gian
- 👤 Gerald T. Klarr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/30; F02D41/32; F02D41/36; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
A method for operating a multicylinder automotive internal combustion engine having individual cylinder fuel injectors and an exhaust treatment catalyst, comprising the steps of: sampling at least one operating parameter of the engine; comparing the sampled parameter to a predetermined range for such parameter; and in the event that the samples parameter falls outside of said predetermined range, operating some of the engine's cylinders according to a base fuel schedule, providing an air/fuel ratio of approximately 13/1, while reducing the time-averaged amount of fuel provided to the remaining cylinders to an amount giving an air/fuel ratio of approximately 16/1, such that said remaining cylinders will be operated at an air/fuel ratio which is lean of stoichiometric, but not so lean that misfire results, while periodically re-sampling said operating parameter; and operating all cylinders of the engine according to the same fuel schedule when said engine has been operated sufficiently that the sampled operating parameter falls within said predetermined range.
Claim 2
Independent Claim
159 words
A method for operating a multicylinder automotive internal combustion engine having individual cylinder fuel injectors and an exhaust treatment catalyst, comprising the steps of: sampling at least one operating parameter of the engine; comparing the sampled parameter to a predetermined range for such parameter; and in the event that the samples parameter falls outside of said predetermined range, operating some of the engine's cylinders according to a base fuel schedule, providing an air/fuel ratio of approximately 13/1, while reducing the time-averaged amount of fuel provided to the remaining cylinders to an amount giving an air/fuel ratio of approximately 16/1, such that said remaining cylinders will be operated at an air/fuel ratio which is lean of stoichiometric, but not so lean that misfire results, while periodically re-sampling said operating parameter; and operating all cylinders of the engine according to the same fuel schedule when said engine has been operated sufficiently that the sampled operating parameter falls within said predetermined range.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the sampled operating parameter comprises engine temperature.
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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) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |