Patent US4373489A successfully refreshed from Google Patents.
US4373489A
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US
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Spark timing control system
Assignee: Nissan Motor Co Ltd
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Filing: 1980-09-26
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Granted: 1983-02-15
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Expires: 2000-09-26
Abstract
Abstract A spark-timing control system is disclosed for an internal combustion engine having spark plugs and means adapted to cut off the supply of fuel to the engine under specified engine operating conditions including engine deceleration, low engine speed, and throttle idle position. The control system comprises a digital computer which performs the operational steps of: setting an optimum spark-timing value in terms of engine load; and providing an ignition signal to cause sparks at the spark plugs after a retard from the set optimum spark-timing value when engine acceleration occurs under a fuel cut-off condition.
Inventors
- 👤 Hiroshi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:33
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1504; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
197 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with a fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value upon the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined time after the occurrence of the demand for fuel delivery consumption; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 2
Dependent Claim
197 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with a fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value upon the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined time after the occurrence of the demand for fuel delivery consumption; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 3
Dependent Claim
193 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value a predetermined time after the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined time after said step (b); and (d) after said step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 4
Dependent Claim
193 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value a predetermined time after the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined time after said step (b); and (d) after said step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 5
Dependent Claim
191 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value upon the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined angle of rotation of said engine; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 6
Dependent Claim
191 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value upon the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined angle of rotation of said engine; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 7
Dependent Claim
203 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value a time corresponding to a predetermined angle of rotation of said engine after the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined angle of rotation of said engine; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 8
Dependent Claim
203 words
A spark-timing control system for controlling the timing of ignition spark in an internal combustion engine, said system being associated with fuel control means for terminating fuel delivery to said engine when the engine speed is above a predetermined value and in the presence of a deceleration condition, said fuel control means being operable to resume fuel delivery to said engine in response to a demand therefor when the engine speed falls below the predetermined value or in the presence of an acceleration condition, said system including a digital computer operable to: (a) calculate an optimum value of spark timing in terms of engine load at which said engine is operating; (b) retard the spark timing by a retard value with respect to the calculated optimum spark timing value a time corresponding to a predetermined angle of rotation of said engine after the occurrence of a demand for fuel delivery resumption; (c) maintain the spark timing of a series of successive sparks retarded by the retard value with respect to the calculated optimum spark timing value for a predetermined angle of rotation of said engine; and (d) after the step (c), gradually advancing the spark timing to the calculated optimum spark timing value.
Claim 9
Dependent Claim
21 words
The spark-timing control system of claim 1 or 2 or 3 or 4, wherein the retard value is a predetermined value.
Claim 10
Dependent Claim
25 words
The spark-timing control system of claim 1 or 2 or 3 or 4, wherein the retard value corresponds to the calculated optimum spark timing value.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |