US4320729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling ignition timing in engine
Assignee: Toyota Motor Corp
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Filing: 1979-05-25
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Granted: 1982-03-23
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Expires: 1999-05-25
Abstract
Abstract A system for controlling ignition timing in an engine wherein a knocking signal is generated by a sensor in response to knocking. The operation of the sensor is monitored, and when a fault in its operation is detected, a dummy signal, instead of the knocking signal is used to control engine timing. The dummy signal causes the engine timing to be retarded to a value at which knocking is unlikely to occur.
Inventors
- 👤 Daisaku Sawada
- 👤 Takashi Shigematsu
- 👤 Yuji Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:37
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1526; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A system for controlling ignition timing of an engine comprising: means for generating an operation signal related to an operating condition of said engine; means for generating a knocking signal related to knocking in said engine; means for controlling said ignition timing in response to said operation signal and said knocking signal; means for integrating said knocking signal; means for generating a fault signal when said integrated knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said controlling means in response to said fault signal.
Claim 2
Independent Claim
131 words
A system for controlling ignition timing of an engine comprising: means for generating an operation signal related to an operating condition of said engine; means for generating a knocking signal related to knocking in said engine; means for controlling said ignition timing in response to said operation signal and said knocking signal; means for integrating said knocking signal; means for generating a fault signal when said integrated knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said controlling means in response to said fault signal.
Claim 3
Independent Claim
168 words
A system for controlling ignition timing of an engine comprising: means for generating ignition pulses related to the rotation of said engine; means for generating a knocking signal related to knocking in said engine; updown counting means for down-counting in response to each of said ignition pulses and up-counting in response to each knocking signal; means for controlling said ignition timing in response to the count stored in said updown counting means; means for half-wave rectifying said knocking signal; means for integrating said half-wave rectified knocking signal to generate a modified knocking signal; means for generating a fault signal when said modified knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy signal having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said updown counting means in response to said fault signal.
Claim 4
Independent Claim
168 words
A system for controlling ignition timing of an engine comprising: means for generating ignition pulses related to the rotation of said engine; means for generating a knocking signal related to knocking in said engine; updown counting means for down-counting in response to each of said ignition pulses and up-counting in response to each knocking signal; means for controlling said ignition timing in response to the count stored in said updown counting means; means for half-wave rectifying said knocking signal; means for integrating said half-wave rectified knocking signal to generate a modified knocking signal; means for generating a fault signal when said modified knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy signal having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said updown counting means in response to said fault signal.
Claim 5
Independent Claim
144 words
A system for controlling ignition timing of an engine comprising: means for generating ignition pulses related to the rotation of said engine; means for generating a knocking signal related to knocking in said engine; means for controlling said ignition timing in response to said ignition pulses and said knocking signal; means for half-wave rectifying said knocking signal; means for integrating said half-wave rectified knocking signal to generate a modified knocking signal; means for generating a fault signal when said modified knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said controlling means in response to said fault signal.
Claim 6
Independent Claim
144 words
A system for controlling ignition timing of an engine comprising: means for generating ignition pulses related to the rotation of said engine; means for generating a knocking signal related to knocking in said engine; means for controlling said ignition timing in response to said ignition pulses and said knocking signal; means for half-wave rectifying said knocking signal; means for integrating said half-wave rectified knocking signal to generate a modified knocking signal; means for generating a fault signal when said modified knocking signal is beyond a predetermined threshold; means for generating a dummy signal, said dummy having the effect of retarding said ignition timing to a timing at which knocking is unlikely to occur when said dummy signal is applied to said controlling means; and means for substituting said dummy signal for said knocking signal to said controlling means in response to said fault signal.
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) | 1985-03-22 | 1985-09-21 | 1986-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-22 | 1989-09-21 | 1990-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-22 | 1993-09-21 | 1994-03-23 | $7700.00 | Window Closed / Lapsed |