US4698765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition timing control system for an automotive engine
Assignee: Subaru Corp
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Filing: 1985-07-22
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Granted: 1987-10-06
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Expires: 2005-07-22
Abstract
Abstract A system is provided for updating data stored in a table at a steady state of an engine in accordance with a feedback signal of an O 2 -sensor. When an updated data is exceeds a predetermined upper or lower limit value, the ignition timing of the engine is adjusted.
Inventors
- 👤 Kunihiro Abe
- 👤 Yoshitake Matsumura
- 👤 Takurou Morozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:57
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
119 words
An ignition timing control system for an automotive engine in which the amount of fuel to be supplied to the engine is controlled by updated data, and the ignition timing is controlled dependent on the amount of the fuel, comprising; a table storing data; an O 2 -sensor for detecting the concentration of exhaust gases of the engine and for producing a feedback signal dependent on the concentration; first means for updating the data in the table with a value relative to the feedback signal; second means for comparing the updated data with predetermined upper and lower limits; and third means for adjusting the ignition timing of the engine, when the updated data exceeds the upper or lower limit.
Claim 2
Dependent Claim
119 words
An ignition timing control system for an automotive engine in which the amount of fuel to be supplied to the engine is controlled by updated data, and the ignition timing is controlled dependent on the amount of the fuel, comprising; a table storing data; an O 2 -sensor for detecting the concentration of exhaust gases of the engine and for producing a feedback signal dependent on the concentration; first means for updating the data in the table with a value relative to the feedback signal; second means for comparing the updated data with predetermined upper and lower limits; and third means for adjusting the ignition timing of the engine, when the updated data exceeds the upper or lower limit.
Claim 3
Dependent Claim
24 words
The system according to claim 1 wherein the amount of the fuel is controlled dependent on engine operating conditions including mass of air flow.
References Cited (Backward Citations)
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |