US4644920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Learning control system for controlling an automotive engine
Assignee: Subaru Corp
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Filing: 1985-07-19
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Granted: 1987-02-24
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Expires: 2005-07-19
Abstract
Abstract A system for updating data stored in a table at a steady state of engine operation in accordance with a feedback signal. When the difference between a maximum value and a minimum value of data stored in the table exceeds a predetermined limit, all the data is rewritten with a predetermined fail safe signal.
Inventors
- 👤 Kunihiro Abe
- 👤 Yoshitake Matsumura
- 👤 Takurou Morozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:09
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1493; F02D41/1495; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2454; F02D41/2487; F02D41/2493; F02D41/2474
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A system for controlling an automotive engine by updated data, comprising: a table storing data which is used for controlling operation of the engine; a sensor for detecting the operating condition of the engine and for producing a feedback signal dependent on the condition; first means for detecting steady state of the engine operation and for producing a first signal; second means responsive to said first signal for updating the data in the table with a value relative to the feedback signal; third means for looking up the difference between a maximum value and a minimum value of the updated data in the table; and fourth means for rewriting all of the data in the table with a predetermined fail safe value when the difference exceeds a predetermined limit value.
Claim 2
Independent Claim
130 words
A system for controlling an automotive engine by updated data, comprising: a table storing data which is used for controlling operation of the engine; a sensor for detecting the operating condition of the engine and for producing a feedback signal dependent on the condition; first means for detecting steady state of the engine operation and for producing a first signal; second means responsive to said first signal for updating the data in the table with a value relative to the feedback signal; third means for looking up the difference between a maximum value and a minimum value of the updated data in the table; and fourth means for rewriting all of the data in the table with a predetermined fail safe value when the difference exceeds a predetermined limit value.
Claim 3
Dependent Claim
24 words
The system according to claim 1 wherein the value relative to the feedback signal is the value of the feedback signal from the sensor.
Claim 4
Dependent Claim
17 words
The system according to claim 1 wherein the predetermined fail safe value is a numerical value 1.
Claim 5
Independent Claim
109 words
A system for controlling an automotive engine by updated data, comprising: a table storing data which is used for controlling operation of the engine; first means for detecting the operating condition of the engine and for producing a feedback signal dependent on the condition; second means for updating the data in the table with a value relative to the feedback signal; third means for looking up the difference between a maximum value and a minimum value of the updated data in the table; and fourth means for rewriting all of the data in the table with a predetermined fail safe value when the difference exceeds a predetermined limit value.
Claim 6
Independent Claim
109 words
A system for controlling an automotive engine by updated data, comprising: a table storing data which is used for controlling operation of the engine; first means for detecting the operating condition of the engine and for producing a feedback signal dependent on the condition; second means for updating the data in the table with a value relative to the feedback signal; third means for looking up the difference between a maximum value and a minimum value of the updated data in the table; and fourth means for rewriting all of the data in the table with a predetermined fail safe value when the difference exceeds a predetermined limit value.
Claim 7
Dependent Claim
21 words
The system according to claim 4, further comprising means for the controlling of the operation of the engine using said data.
References Cited (Backward Citations)
US4345561A
Cited
US4309971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |