Patent US5170762A successfully refreshed from Google Patents.
US5170762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition timing control system for internal combustion engines
Assignee: Honda Motor Co Ltd
•
Filing: 1991-12-20
•
Granted: 1992-12-15
•
Expires: 2011-12-20
Abstract
Abstract An ignition timing control system for an internal combustion engine is operable to detect knocking occurring in the engine, determine basic ignition timing based upon operating conditions of the engine, correct the basic ignition timing by a correction value which is determined in response to an output from a knocking sensor, and inhibit correction of the correction value toward an advanced side with respect to at least one predetermined value in a timing retarding direction which is determined based upon operating conditions of the engine, when the correction value is greater than the at least one predetermined value. The correction value is initialized to a value based upon the difference between the correction value and the at least one predetermined value when the correction value exceeds the at least one predetermine value.
Inventors
- 👤 Kojiro Tsutsumi
- 👤 Masaki Kanehiro
- 👤 Kyozo Futa
- 👤 Sachito Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:49
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1521; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
In an ignition timing control system for an internal combustion engine, including operating condition detecting means for detecting operating conditions of said engine, knocking detecting means for detecting knocking occurring in said engine, basic ignition timing determining means for determining basic ignition timing based upon operating conditions of said engine, ignition timing correcting means for correcting said basic ignition timing by a correction value which is determined in response to an output from said knocking detecting means, and advancing correction inhibiting means for inhibiting correction of said correction value toward an advanced side with respect to at least one predetermined value in a timing retarding direction which is determined based upon operating conditions of said engine, when said correction value is greater than said at least one predetermined value, the improvement comprising: determining means for determining whether or not said correction value exceeds said at least one predetermined value; and initializing means responsive to an output from said determining means for initializing said correction value to a value based upon a difference between said correction value and said at least one predetermined value when said correction value exceeds said at least one predetermine value.
Claim 2
Dependent Claim
194 words
In an ignition timing control system for an internal combustion engine, including operating condition detecting means for detecting operating conditions of said engine, knocking detecting means for detecting knocking occurring in said engine, basic ignition timing determining means for determining basic ignition timing based upon operating conditions of said engine, ignition timing correcting means for correcting said basic ignition timing by a correction value which is determined in response to an output from said knocking detecting means, and advancing correction inhibiting means for inhibiting correction of said correction value toward an advanced side with respect to at least one predetermined value in a timing retarding direction which is determined based upon operating conditions of said engine, when said correction value is greater than said at least one predetermined value, the improvement comprising: determining means for determining whether or not said correction value exceeds said at least one predetermined value; and initializing means responsive to an output from said determining means for initializing said correction value to a value based upon a difference between said correction value and said at least one predetermined value when said correction value exceeds said at least one predetermine value.
Claim 3
Dependent Claim
54 words
An ignition timing control system as claimed in claim 1, wherein said correction value is initialized to said difference or the sum of said difference and said at least one predetermined value, depending upon zones each having an ignition timing control characteristic corresponding to an octane value of a fuel used in said engine.
Claim 4
Dependent Claim
30 words
An ignition timing control system as claimed in claim 1 or 2, wherein said at least one predetermined value is set by a parameter indicative of load on said engine.
Claim 5
Dependent Claim
32 words
An ignition timing control system as claimed in claim 3, wherein said at least one predetermined value is set by rotational speed of said engine and intake pipe pressure of said engine.
Claim 6
Dependent Claim
61 words
An ignition timing control system as claimed in claim 1 or 2, wherein said difference between said correction value and said at least one predetermined value is corrected in a direction of advancing or retarding ignition timing of said engine in response to frequency of occurrence of knocking in said engine, said initialization of said correction value comprising initializing said difference.
Claim 7
Dependent Claim
28 words
An ignition timing control system as claimed in claim 2, wherein said zones are discriminated by determining whether or not said correction values exceeds respective second predetermined values.
Claim 8
Dependent Claim
62 words
An ignition timing control system as claimed in claim 6, wherein said first-mentioned at least one predetermined value comprises a plurality of predetermined values provided respectively for said zones, said second predetermined values each having a value retarding ignition timing of said engine by a larger amount than a corresponding one of said predetermined values of said at least one predetermined value.
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) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |