US5048486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition circuit with timing control
Assignee: Mitsubishi Electric Corp
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Filing: 1990-08-02
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Granted: 1991-09-17
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Expires: 2010-08-02
Abstract
Abstract An ignition apparatus which determines ignition timing corresponding to the running state of an internal combustion engine. Ignition timing is advanced for a period when a choke switch 21 used for improving startability of the engine at a low temperature is closed, and for a predetermined period after the choke switch is opened as determined by the time constant of an RC circuit. When the predetermined period passes after the choke switch is opened, the ignition timing is delayed to a characteristic suitable for the running of the engine after warm up.
Inventors
- 👤 Hiroshi Okuda
- 👤 Kyoichi Kamoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:01
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P5/1558; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
An ignition apparatus which determines an ignition timing corresponding to the running state of an internal combustion engine provided with a choke switch, comprising: advance signal outputting means for outputting an advance signal of the ignition timing during a period when said choke switch is closed and for a predetermined period after said choke switch is opened; and advancing means for advancing the ignition timing of said internal combustion engine on the basis of said advance signal outputted from said advance signal outputting means.
Claim 2
Dependent Claim
84 words
An ignition apparatus which determines an ignition timing corresponding to the running state of an internal combustion engine provided with a choke switch, comprising: advance signal outputting means for outputting an advance signal of the ignition timing during a period when said choke switch is closed and for a predetermined period after said choke switch is opened; and advancing means for advancing the ignition timing of said internal combustion engine on the basis of said advance signal outputted from said advance signal outputting means.
Claim 3
Dependent Claim
87 words
An ignition apparatus as set forth in claim 1, wherein said advance signal outputting means includes; a signal coil for generating an ignition signal corresponding to the ignition timing of said internal combustion engine; signal outputting means for outputting a signal for a period except for said period when said choke switch is closed and said predetermined period after said choke switch is opened; and a transistor disposed between said signal coil and ground, and having a base connected to an output of said signal outputting means.
Claim 4
Dependent Claim
39 words
An ignition apparatus as set forth in claim 2, wherein said advance signal outputting means further includes computing means connected to said signal coil for computing an ignition timing of said internal combustion engine when said transistor is conductive.
Claim 5
Dependent Claim
40 words
An ignition apparatus as set forth in claim 2, wherein said signal outputting means includes a comparator for inputting a variable voltage varied by an on/off action of said choke switch and a constant reference voltage, and comparing both voltages.
Claim 6
Dependent Claim
50 words
An ignition apparatus as set forth in claim 4, wherein, for said period when said choke switch is closed and for said predetermined period after said choke switch is opened, said variable voltage is higher than said reference voltage, and said comparator does not output a signal to said base.
Claim 7
Dependent Claim
19 words
An ignition apparatus as set forth in claim 2, wherein said signal coil generates an advanced ignition timing signal.
Claim 8
Dependent Claim
23 words
An ignition apparatus as set forth in claim 2, further comprising detecting means for detecting a rotation number of said internal combustion engine.
Claim 9
Dependent Claim
46 words
An ignition apparatus as set forth in claim 7, wherein said detecting means is connected to the base of said transistor, and when the rotation number of said internal combustion engine is larger than a predetermined number, said detecting means outputs a signal to said base.
Claim 10
Dependent Claim
29 words
An ignition apparatus as set forth in claim 8, wherein said signal coil generates an advanced ignition timing signal whose ignition timing is more advanced than a usual one.
Claim 11
Dependent Claim
107 words
An ignition apparatus which determines an ignition timing corresponding to the running state of an internal combustion engine provided with a choke switch, comprising: a signal coil for generating an advanced ignition timing signal for said internal combustion engine; a comparator for inputting a variable voltage varied by an on/off action of said choke switch and a constant reference voltage, and comparing both voltages; a transistor disposed between said signal coil and ground, and having a base connected to an output of said comparator; and computing means connected to said signal coil for computing an ignition timing of said internal combustion engine when said transistor is conductive.
Claim 12
Dependent Claim
107 words
An ignition apparatus which determines an ignition timing corresponding to the running state of an internal combustion engine provided with a choke switch, comprising: a signal coil for generating an advanced ignition timing signal for said internal combustion engine; a comparator for inputting a variable voltage varied by an on/off action of said choke switch and a constant reference voltage, and comparing both voltages; a transistor disposed between said signal coil and ground, and having a base connected to an output of said comparator; and computing means connected to said signal coil for computing an ignition timing of said internal combustion engine when said transistor is conductive.
Claim 13
Dependent Claim
39 words
An ignition apparatus as set forth in claim 10, wherein said variable voltage is higher than said reference voltage for a period when said choke switch is closed and for a predetermined period after said choke switch is opened.
Claim 14
Dependent Claim
44 words
An ignition apparatus as set forth in claim 11, wherein said comparator outputs a signal to said base when said variable voltage is lower than said reference voltage, and does not output a signal when said variable voltage is higher than said reference voltage.
Claim 15
Dependent Claim
23 words
An ignition apparatus as set forth in claim 10, further comprising detecting means for detecting a rotation number of said internal combustion engine.
Claim 16
Dependent Claim
46 words
An ignition apparatus as set forth in claim 13, wherein said detecting means is connected to the base of said transistor, and when the rotation number of said internal combustion engine is larger than a predetermined number, said detecting means outputs a signal to said base.
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) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |