US4382429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark timing system for spark ignition internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1981-01-23
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Granted: 1983-05-10
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Expires: 2001-01-23
Abstract
Abstract A spark timing adjusting circuit receives a basic spark timing signal from a spark timing determining circuit and regulates the spark timing according to a knocking signal from a knocking detector. A speed changing circuit serves to increase the rate of advance of the spark timing after the spark timing has been retarded when the operational state of the engine is in a first predetermined range corresponding to a first speed range in which all the engine speeds are lower than a first predetermined value. The speed changing circuit may include a circuit which decreases the rate of retard of the spark timing when the operational state of the engine is in a second predetermined range corresponding to a second speed range in which all the engine speeds are higher than a second predetermined value which is higher than the first predetermined value, thereby avoiding rapid retardation of the spark timing. Alternatively, the first and second predetermined ranges of the operational state of the engine may be defined with respect to intake manifold vacuum, throttle valve opening or intake air amount to the engine.
Inventors
- 👤 Toshio Enoshima
- 👤 Shoji Furuhashi
- 👤 Hideyuki Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:12
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1523; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
154 words
A spark timing system for a spark ignition internal combustion engine, comprising: (a) reference spark timing generating means for producing a basic spark timing signal; (b) knocking detecting means for sensing knocking occurring in said engine to generate a knocking signal representing the occurrence of the knocking; (c) spark timing adjusting means responsive to the knocking signal for adjusting the basic spark timing signal in the direction of retarding spark timing by an amount determined by a first rate of change in the presence of the knocking signal and for adjusting the basic spark timing signal in the direction of advancing spark timing by an amount determined by a second rate of change in the absence of the knocking; and (d) rate-changing means responsive to one of engine load and engine speed for increasing the second rate of change when said one of engine load and engine speed decreases below a first predetermined level.
Claim 2
Dependent Claim
154 words
A spark timing system for a spark ignition internal combustion engine, comprising: (a) reference spark timing generating means for producing a basic spark timing signal; (b) knocking detecting means for sensing knocking occurring in said engine to generate a knocking signal representing the occurrence of the knocking; (c) spark timing adjusting means responsive to the knocking signal for adjusting the basic spark timing signal in the direction of retarding spark timing by an amount determined by a first rate of change in the presence of the knocking signal and for adjusting the basic spark timing signal in the direction of advancing spark timing by an amount determined by a second rate of change in the absence of the knocking; and (d) rate-changing means responsive to one of engine load and engine speed for increasing the second rate of change when said one of engine load and engine speed decreases below a first predetermined level.
Claim 3
Dependent Claim
63 words
The spark timing system as claimed in claim 1, in which said spark timing adjusting means includes a capacitor which is charged and discharged according to the presence or absence respectively of a knocking signal, and in which said rate changing means is adapted to perform the second rate of change by changing the discharge time constant of a circuit including said capacitor.
Claim 4
Dependent Claim
62 words
The spark timing system as claimed in claim 2, in which said spark timing adjusting means comprises a first resistance means determining the discharge time constant of said capacitor and said rate changing means includes a first switching means adapted to switch said first resistance means between at least two different resistance values in order to perform the second rate of change.
Claim 5
Dependent Claim
71 words
The spark timing system as claimed in claim 3, in which rate changing means includes a first engine operational state determining circuit responsive to said one of engine load and engine speed for producing a drive signal which causes said first switching means to switch said first resistance means to a lower resistance value when said one of engine load and engine speed decreases below said first relatively low predetermined level.
Claim 6
Dependent Claim
44 words
The spark timing system as claimed in claim 4, in which said first engine operational state determining circuit includes an engine speed determining circuit responsive to engine speed for producing said drive signal when the engine speed is below a predetermined relatively low value.
Claim 7
Dependent Claim
49 words
The spark timing system as claimed in claim 4, in which said first engine operational state predetermining circuit includes an intake manifold vacuum determining circuit responsive to intake manifold vacuum value for producing the drive signal when the intake manifold vacuum value is above a predetermined relatively high value.
Claim 8
Dependent Claim
47 words
The spark timing system as claimed in claim 4, in which said first engine operational state determining circuit includes a throttle valve opening determining circuit responsive to throttle valve opening for producing the drive signal when the throttle valve opening is below a predetermined relatively low value.
Claim 9
Dependent Claim
50 words
The spark timing system as claimed in claim 4, in which said first engine operational state determining circuit includes an intake air amount determining circuit responsive to intake air quantity for producing the drive signal when the intake air amount to said engine is below a predetermined relatively low value.
Claim 10
Dependent Claim
24 words
The spark timing system as claimed in any one of claims 4 to 8, in which said first switching means comprises a first transistor.
Claim 11
Dependent Claim
24 words
The spark timing system as claimed in any one of claims 4 to 8, in which said first switching means comprises a first relay.
Claim 12
Dependent Claim
42 words
The spark timing system as claimed in any one of claims 2 to 8, in which said rate changing means is adapted further to perform said first rate of change by changing the charge time constant of a circuit including said capacitor.
Claim 13
Dependent Claim
63 words
The spark timing system as claimed in claim 11 in which said spark timing adjusting means further comprises a second resistance means determining the charge time constant of said capacitor and said rate changing means includes a second switching means adapted to switch said second resistance means between at least two different resistance values in orer to perform said first rate of change.
Claim 14
Dependent Claim
78 words
The spark timing system as claimed in claim 12, in which said rate changing means includes a second engine operational state determining circuit responsive to one of said engine load and engine speed for producing a second drive signal which causes said second switching means to switch said second resistance means to a lower resistance value when said one of said engine load and engine speed is below a second predetermined level higher than said first predetermined level.
Claim 15
Dependent Claim
45 words
The spark timing system as claimed in claim 13, in which said second engine operational state determining circuit includes an engine speed determining circuit responsive to engine speed for producing the second drive signal when the engine speed is above a predetermined relatively high value.
Claim 16
Dependent Claim
49 words
The spark timing system as claimed in claim 13, in which said second engine operational state determining circuit includes an intake manifold vacuum determining circuit responsive to intake manifold vacuum for producing the second drive signal when the intake manifold vacuum value is below a predetermined relatively high value.
Claim 17
Dependent Claim
48 words
The spark timing system as claimed in claim 13, in which said second engine operational state determining circuit includes a throttle valve opening determining circuit responsive to throttle valve opening for producing the second drive signal when the throttle valve opening is above a predetermined relatively low value.
Claim 18
Dependent Claim
51 words
The spark timing system as claimed in claim 13, in which said second engine operational state determining circuit includes an intake air amount determining circuit responsive to intake air amounts for producing the second drive signal when the intake air amount into said engine is above a predetermined relatively low value.
Claim 19
Dependent Claim
19 words
The spark timing system as claimed in claim 13, in which said second switching means comprises a second transistor.
Claim 20
Dependent Claim
19 words
The spark timing system as claimed in claim 14, in which said second switching means comprises a second transistor.
Claim 21
Dependent Claim
19 words
The spark timing system as claimed in claim 15, in which said second switching means comprises a second transistor.
Claim 22
Dependent Claim
19 words
The spark timing system as claimed in claim 16, in which said second switching means comprises a second transistor.
Claim 23
Dependent Claim
19 words
The spark timing system as claimed in claim 17, in which said second transistor means comprises a second transistor.
Claim 24
Dependent Claim
19 words
The spark timing system as claimed in claim 13, in which said second switching means comprises a second relay.
Claim 25
Dependent Claim
19 words
The spark timing system as claimed in claim 14, in which said second switching means comprises a second relay.
Claim 26
Dependent Claim
19 words
The spark timing system as claimed in claim 15, in which said second switching means comprises a second relay.
Claim 27
Dependent Claim
19 words
The spark timing system as claimed in claim 16, in which said second switching means comprises a second relay.
Claim 28
Dependent Claim
19 words
The spark timing system as claimed in claim 17, in which said second switching means comprises a second relay.
Claim 29
Dependent Claim
78 words
The spark timing system as claimed in claim 2, in which said spark timing adjusting means comprises a first electronically controlled resistance means determining the discharge time constant of a circuit including said capacitor, and said rate changing means includes a first engine operational state determining circuit producing a signal to change the value of said electronically controlled resistance means when said engine operational state determining circuit detects that the engine speed decreases below a first predetermined level.
Claim 30
Dependent Claim
105 words
The spark timing system as claimed in claim 28, in which said spark timing adjusting means further comprises a second electronically controlled resistance means determining the charge time constant of a circuit including said capacitor, and said rate changing means includes a second engine operational state determining circuit responsive to one of engine load and engine speed for producing a signal to change the value of said second electronically controlled resistance means to a higher value when said second engine operational state determining circuit detects that said one of engine load and engine speed is above a second level higher than the first predetermined level.
Claim 31
Dependent Claim
27 words
The spark timing system of claim 1, wherein said rate-changing means also decreases the first rate of change when engine speed decreases below a first predetermined level.
Claim 32
Dependent Claim
55 words
The spark timing system of either claim 1 or 30, further comprising a second rate-changing means responsive to one of said engine load and engine speed for decreasing the first rate of change when said one of said engine load and engine speed increases to a second predetermined level significantly greater than the first level.
Claim 33
Dependent Claim
19 words
The spark timing system of claim 30, wherein said engine load is the intake air flow to said engine.
Claim 34
Dependent Claim
19 words
The spark timing system of claim 30, wherein said load is the extent of opening of a throttle valve.
Claim 35
Dependent Claim
14 words
The spark timing system of claim 30, wherein said load is intake manifold pressure.
Claim 36
Dependent Claim
164 words
In a spark timing system for a spark ignition combustion engine of the type comprising means for producing a basic spark timing signal and knocking detecting means for sensing the occurrence of knocking in said engine to produce a knocking signal representing the occurrence of the knocking, the improvement comprising: spark timing adjusting means responsive to said knocking signal for adjusting said basic spark timing signal (a) to retard spark timing by an amount determined by a first rate of change in the presence of the knocking signal; and (b) to advance spark timing by an amount determined by a second rate of change in the absence of the knocking signal; and rate changing means for changing at least one of the first rate of change or the second rate of change in response to at least one of the engine load and engine speed only when said at least one of the engine load and engine speed decreases below a first predetermined value.
Claim 37
Dependent Claim
164 words
In a spark timing system for a spark ignition combustion engine of the type comprising means for producing a basic spark timing signal and knocking detecting means for sensing the occurrence of knocking in said engine to produce a knocking signal representing the occurrence of the knocking, the improvement comprising: spark timing adjusting means responsive to said knocking signal for adjusting said basic spark timing signal (a) to retard spark timing by an amount determined by a first rate of change in the presence of the knocking signal; and (b) to advance spark timing by an amount determined by a second rate of change in the absence of the knocking signal; and rate changing means for changing at least one of the first rate of change or the second rate of change in response to at least one of the engine load and engine speed only when said at least one of the engine load and engine speed decreases below a first predetermined value.
Claim 38
Dependent Claim
79 words
The spark timing system of claim 35, wherein said spark timing adjusting means includes a capacitor and means for charging the capacitor in response to the presence or absence of said knocking signal and said rate changing means includes switching means for changing the discharge time constant of said capacitor between at least two different discrete values, said switching means being responsive to one of said engine load and engine speed when either decreases to a first predetermined level.
Claim 39
Dependent Claim
38 words
The spark timing system as set forth in claim 36, wherein said switching means is further responsive to one of said engine load and engine speed decreasing to a second predetermined level higher than said first predetermined level.
References Cited (Backward Citations)
US4100895A
Cited
US4002155A
Cited
US4211194A
Cited
US4133475A
Cited
US4242995A
Cited
US4282841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |