Patent US4887573A successfully refreshed from Google Patents.
US4887573A
Expired / Lapsed
US
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Ignition timing adjusting apparatus for internal combustion engine
Assignee: Hitachi Ltd
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Filing: 1988-11-07
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Granted: 1989-12-19
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Expires: 2008-11-07
Abstract
Abstract An ignition timing adjusting apparatus of an internal combustion engine is provided so as to suppress the vibration of the body of a vehicle when it is accelerated. This is achieved by obtaining a first ignition timing compensation magnitude determined on the basis of the revolution speed fluctuation of the internal combustion engine and a second ignition timing compensation magnitude determined on the basis of the engine load condition, and by compensating a basic ignition timing in accordance with the first and second ignition timing compensation magnitude when the vehicle is accelerated.
Inventors
- 👤 Yasuhiko Fujiwara
- 👤 Toshiro Abe
- 👤 Atsunori Hashimoto
- 👤 Shinsuke Nakazawa
- 👤 Masami Nagano
- 👤 Takeshi Atago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:43
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; F02P5/145; F02P5/15; F02P5/1502; F02P5/1504; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
An ignition timing adjusting apparatus of an internal combustion engine, comprising: means for determining a basic ignition timing on the basis of values indicating an operational state of an internal combustion engine; means for detecting acceleration of said engine; means for detecting revolution speed change of said internal combustion engine; first ignition timing compensating means for determining a first ignition timing compensation magnitude for compensating said basic ignition timing on the basis of the output of said engine revolution speed change detecting means; second ignition timing compensating means for determining a second ignition timing compensation magnitude for compensating said basic ignition timing on the basis of the load condition of said internal combustion engine; and means for determining the ignition timing on the basis of said basic ignition timing, said first ignition timing compensation magnitude and said second ignition timing compensation magnitude when the acceleration of the engine is detected by said acceleration detecting means.
Claim 2
Dependent Claim
155 words
An ignition timing adjusting apparatus of an internal combustion engine, comprising: means for determining a basic ignition timing on the basis of values indicating an operational state of an internal combustion engine; means for detecting acceleration of said engine; means for detecting revolution speed change of said internal combustion engine; first ignition timing compensating means for determining a first ignition timing compensation magnitude for compensating said basic ignition timing on the basis of the output of said engine revolution speed change detecting means; second ignition timing compensating means for determining a second ignition timing compensation magnitude for compensating said basic ignition timing on the basis of the load condition of said internal combustion engine; and means for determining the ignition timing on the basis of said basic ignition timing, said first ignition timing compensation magnitude and said second ignition timing compensation magnitude when the acceleration of the engine is detected by said acceleration detecting means.
Claim 3
Dependent Claim
64 words
An apparatus claimed in claim 1, further comprising third ignition timing compensating means for determining a third ignition timing compensation magnitude on the basis of said engine revolution speed; and said ignition timing determining means determining the ignition timing on the basis of said third ignition timing compensation magnitude in addition to said basic ignition timing, said first and second ignition timing compensation magnitudes.
Claim 4
Dependent Claim
36 words
An apparatus claimed in claim 1, wherein said second ignition timing compensation magnitude is set up so that it is smaller in case of decreasing the engine revolution than in case of increasing the engine revolution.
Claim 5
Dependent Claim
35 words
An apparatus claimed in claim 1, wherein the load condition for determining said second ignition timing compensation magnitude is represented by the basic ignition timing determined by means of said basic ignition timing determining means.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |