US4718014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling ignition timing in an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1985-05-02
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Granted: 1988-01-05
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Expires: 2005-05-02
Abstract
Abstract An ignition timing control apparatus for a spark ignition internal combustion engine for a vehicle having a manually operated transmission system. The apparatus includes an ignition control system for controlling ignition timing in such a manner that the timing is advanced when the engine speed drops due to engagement of the clutch of the transmission apparatus to begin the initial movement of the vehicle. The drop in the engine speed is sensed by detecting whether a second order difference value of the engine speed is lower than a reference value. This realizes quick control of the engine speed.
Inventors
- 👤 Nobuyuki Kobayashi
- 👤 Takashi Hattori
- 👤 Kazuhiko Norota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
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: 12
Claim 1
Independent Claim
215 words
An apparatus for controlling an ignition timing in a spark ignition internal combustion engine for a vehicle having a manually operated type transmission device, speed apparatus comprising: first detecting means for detecting an engine speed; first calculating means, connected to said first detecting means, for calculating a second order differentiation on said engine speed sensed by the first detecting means, to detect a reduction in said engine speed; second detecting means for detecting an initial movement of the vehicle; second calculating means for calculating a basic ignition timing in accordance with at least one engine operating condition; gate means for issuing a signal which is indicative of a rapid engagement of said manually operated transmission device, upon a detection of said reduction in engine speed and a detection of said initial movement of the vehicle; correction means responsive to said signal from said gate means for correcting said basic ignition timing calculated by the second calculating means to obtain an advanced ignition timing value which is advanced with respect to said basic ignition timing to increase engine torque under such conditions and enable a smooth initial movement of the vehicle; and means for generating a spark arc at the calculated ignition timing in order to cause the ignition to take place at the proper timing.
Claim 2
Independent Claim
215 words
An apparatus for controlling an ignition timing in a spark ignition internal combustion engine for a vehicle having a manually operated type transmission device, speed apparatus comprising: first detecting means for detecting an engine speed; first calculating means, connected to said first detecting means, for calculating a second order differentiation on said engine speed sensed by the first detecting means, to detect a reduction in said engine speed; second detecting means for detecting an initial movement of the vehicle; second calculating means for calculating a basic ignition timing in accordance with at least one engine operating condition; gate means for issuing a signal which is indicative of a rapid engagement of said manually operated transmission device, upon a detection of said reduction in engine speed and a detection of said initial movement of the vehicle; correction means responsive to said signal from said gate means for correcting said basic ignition timing calculated by the second calculating means to obtain an advanced ignition timing value which is advanced with respect to said basic ignition timing to increase engine torque under such conditions and enable a smooth initial movement of the vehicle; and means for generating a spark arc at the calculated ignition timing in order to cause the ignition to take place at the proper timing.
Claim 3
Dependent Claim
59 words
An apparatus according to claim 1, wherein said second detecting means comprises first means for determining whether said engine speed is lower than a first predetermined value, second means for detecting whether a vehicle speed is lower than a second predetermined value, and third means for detecting whether an absolute intake pressure is higher than a third predetermined value.
Claim 4
Dependent Claim
40 words
An apparatus according to claim 1, wherein said first calculating means comprises means for calculating a difference over the engine speed in a predetermined period, and means for calculating a difference in said engine speed difference over a predetermined period.
Claim 5
Dependent Claim
45 words
An apparatus according to claim 3, wherein said first calculating means comprises means for calculating a reference value of said second order engine speed difference, and means for comparing said calculated second order engine speed reference value with said calculated second order engine speed difference.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 4, wherein said reference value of the second order engine speed difference is fixed.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 4, wherein said reference value of the second order engine speed difference is varied in accordance with the engine speed.
Claim 8
Dependent Claim
72 words
An apparatus according to claim 1, wherein said correction means comprises means for counting a number of ignition operations at the corrected ignition timing, means for comparing the counted number of ignition operations with a predetermined reference number and means for calculating a correction timing value, indicative of a correction to be performed to ignition timing, to be added to the basic ignition timing until the counted number reaches the reference number.
Claim 9
Dependent Claim
12 words
An apparatus according to claim 7, wherein said reference number is fixed.
Claim 10
Dependent Claim
22 words
An apparatus according to claim 7, wherein said reference number is varied in accordance with the second order engine speed difference value.
Claim 11
Dependent Claim
13 words
An apparatus according to claim 7, wherein said correction timing value is fixed.
Claim 12
Dependent Claim
23 words
An apparatus according to claim 7, wherein said correction timing value is varied in accordance with the second order engine speed difference value.
References Cited (Backward Citations)
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |