US4257364A
Expired / Lapsed
US
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Method and system for controlling ignition timing
Assignee: Toyota Motor Corp
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Filing: 1979-05-16
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Granted: 1981-03-24
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Expires: 1999-05-16
Abstract
Abstract Method and system for controlling ignition timing includes the steps of and means for discriminating when the time interval between knocking indicative signal pulses is shorter than a particular time period, and controlling ignition timing at a rate related to the frequency of occurrence of knocking to prevent the knocking from occurring. A pulse train is generated having an interval shorter than that of the knocking signal pulse train when the interval of the knocking signal pulse is shorter than the particular time period. The generated pulse train is fed to a control circuit for determining the time by which ignition pulses should be delayed.
Inventors
- 👤 Daisaku Sawada
- 👤 Takashi Shigematu
- 👤 Yuji Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:03
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: 18
Claim 1
Independent Claim
92 words
A method for controlling ignition timing, comprising the steps of: generating a knocking signal pulse related to the occurrence of knocking in an engine; discriminating when the time interval between knocking signal pulses is shorter than a time period; generating a pulse train having an interval shorter than that of the knocking signal pulse train when the interval of the knocking signal pulse is discriminated to be shorter than said time period; and delaying said ignition pulses by a period related to said generated pulse train and said knocking signal pulse train.
Claim 2
Independent Claim
92 words
A method for controlling ignition timing, comprising the steps of: generating a knocking signal pulse related to the occurrence of knocking in an engine; discriminating when the time interval between knocking signal pulses is shorter than a time period; generating a pulse train having an interval shorter than that of the knocking signal pulse train when the interval of the knocking signal pulse is discriminated to be shorter than said time period; and delaying said ignition pulses by a period related to said generated pulse train and said knocking signal pulse train.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein said time period is a fixed, predetermined time period.
Claim 4
Dependent Claim
27 words
A method as in claim 1 wherein said time period is related to the period of time necessary for the engine to revolve through a predetermined angle.
Claim 5
Independent Claim
106 words
A system for controlling ignition timing, comprising: means for generating ignition pulses related to the rotation of an engine; means for generating knocking signal pulses related to the occurrence of knocking in an engine; first means for comparing the interval between knocking signal pulses with a time period and discriminating therebetween; second means for generating a pulse train having an interval shorter than that of the knocking signal pulse train when the interval of the knocking signal pulse is shorter than said time period; and means for delaying said ignition pulses by a period related to said generated pulse train and said knocking signal pulse train.
Claim 6
Independent Claim
106 words
A system for controlling ignition timing, comprising: means for generating ignition pulses related to the rotation of an engine; means for generating knocking signal pulses related to the occurrence of knocking in an engine; first means for comparing the interval between knocking signal pulses with a time period and discriminating therebetween; second means for generating a pulse train having an interval shorter than that of the knocking signal pulse train when the interval of the knocking signal pulse is shorter than said time period; and means for delaying said ignition pulses by a period related to said generated pulse train and said knocking signal pulse train.
Claim 7
Dependent Claim
42 words
A system for controlling ignition timing as set forth in claim 4, wherein said first means is a counter using a knocking signal pulse as a reset pulse and sending out an output signal upon counting a predetermined number of ignition pulses.
Claim 8
Dependent Claim
16 words
A system as in claim 4 wherein said time period is a fixed, predetermined time period.
Claim 9
Dependent Claim
27 words
A system as in claim 4 wherein said time period is related to the period of time necessary for the engine to revolve through a predetermined angle.
Claim 10
Dependent Claim
43 words
A system for controlling ignition timing as set forth in claim 4, wherein said first means is a counter using a knocking signal pulse as a reset pulse and sending out an output signal upon counting a predetermined number of fixed frequency pulses.
Claim 11
Dependent Claim
53 words
A system for controlling ignition timing as set forth in claim 4, 5 or 8, wherein said second means includes a pair of monostable multivibrators, one of which generates a pulse per rise of the knocking signal pulse and the other of which generates a pulse per fall of the knocking signal pulse.
Claim 12
Independent Claim
120 words
A system for controlling ignition timing, comprising: an ignition pulse detecting circuit for generating an ignition pulse in accordance with the rotation of an engine; a knocking detecting circuit for generating knocking signal pulses related to the occurrence of knocking; a knocking frequency discriminating circuit for generating an output pulse per two counts of fixed frequency pulses until it is reset by a knocking signal pulse; means for generating delay pulses related to said knocking signal pulses between detection of one of said knocking signal pulses by said knocking detecting circuit and said knocking frequency discriminating circuit output pulse; and delay control means for counting said delay pulses and delaying said ignition pulses by a time related to said count.
Claim 13
Independent Claim
120 words
A system for controlling ignition timing, comprising: an ignition pulse detecting circuit for generating an ignition pulse in accordance with the rotation of an engine; a knocking detecting circuit for generating knocking signal pulses related to the occurrence of knocking; a knocking frequency discriminating circuit for generating an output pulse per two counts of fixed frequency pulses until it is reset by a knocking signal pulse; means for generating delay pulses related to said knocking signal pulses between detection of one of said knocking signal pulses by said knocking detecting circuit and said knocking frequency discriminating circuit output pulse; and delay control means for counting said delay pulses and delaying said ignition pulses by a time related to said count.
Claim 14
Independent Claim
120 words
A system for controlling ignition timing, comprising: an ignition pulse detecting circuit for generating an ignition pulse in accordance with the rotation of an engine; a knocking detecting circuit for generating knocking signal pulses related to the occurrence of knocking; a knocking frequency discriminating circuit for generating an output pulse per two counts of said ignition pulses until it is reset by a knocking signal pulse; means for generating delay pulses related to said knocking signal pulses between detection of one of said knocking signal pulses by said knocking detecting circuit and said knocking frequency discriminating circuit output pulse; and delay control means for counting said delay pulses and delaying said ignition pulses by a time related to said count.
Claim 15
Independent Claim
120 words
A system for controlling ignition timing, comprising: an ignition pulse detecting circuit for generating an ignition pulse in accordance with the rotation of an engine; a knocking detecting circuit for generating knocking signal pulses related to the occurrence of knocking; a knocking frequency discriminating circuit for generating an output pulse per two counts of said ignition pulses until it is reset by a knocking signal pulse; means for generating delay pulses related to said knocking signal pulses between detection of one of said knocking signal pulses by said knocking detecting circuit and said knocking frequency discriminating circuit output pulse; and delay control means for counting said delay pulses and delaying said ignition pulses by a time related to said count.
Claim 16
Dependent Claim
97 words
A system for controlling ignition timing as set forth in claim 11 or 10, wherein said delay pulse generating means comprises: a first monostable multivibrator for generating pulses related to rising edges of said knocking signal pulses; a second monostable multivibrator for generating pulses related to falling edges of said knocking signal pulses; a switching circuit actuated by said second monostable multivibrator pulses and deactivated by said knocking frequency discriminating circuit output pulses; and an "OR" circuit for sending out the logical sum between an output of said switching circuit and that of said second monostable multivibrator.
Claim 17
Dependent Claim
69 words
A system for controlling ignition timing as set forth in claim 12, wherein said delay control means comprises: an up/down counter for up-counting by said delay pulses and down-counting by said ignition pulses; and an ignition timing calculation circuit for calculating the value of delay in ignition timing corresponding to the value of count in said up/down counter and sending out an ignition pulse according to value of calculation.
Claim 18
Dependent Claim
72 words
A system for controlling ignition timing as set forth in claim 11 or 10, wherein said delay control means comprises: an up/down counter for up-counting by said delay pulses and down-counting by said ignition pulses; and an ignition timing calculation circuit for calculating the value of delay in ignition timing corresponding to the value of count in said up/down counter and sending out an ignition pulse according to said value of calculation.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |