US4454560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition detector circuit
Assignee: Toshiba Corp
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Filing: 1981-11-09
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Granted: 1984-06-12
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Expires: 2001-11-09
Abstract
Abstract An ignition detector circuit includes first and second resistors connected in series between a primary winding of a coil and the ground, a comparator having a first input terminal connected to the junction between first and second resistors and a second input terminal to which a reference voltage is applied, and a capacitor and a third resistor connected in parallel between the first input terminal of the comparator and the ground.
Inventors
- 👤 Satoshi Nakao
- 👤 Yasuo Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:51
CPC Classifications
F; F02; F02P; F02P11/00; F02P11/06; F02P17/00; F02P17/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
An ignition detector circuit comprising: voltage detecting means for detecting a voltage at a primary winding of an ignition coil and generating an output voltage according to the voltage detected; capacitive means charged according to the output voltage from said voltage detecting means, said capacitive means storing a voltage which becomes higher than a predetermined voltage only when a voltage impulse is generated at the primary winding immediately after a constant coil current through the primary winding is rapidly interrupted; discharging means for causing said capacitive means to be discharged; and a comparator circuit for comparing the voltage charged on said capacitive means with said predetermined voltage to generate an output signal according to the result of the comparison.
Claim 2
Dependent Claim
119 words
An ignition detector circuit comprising: voltage detecting means for detecting a voltage at a primary winding of an ignition coil and generating an output voltage according to the voltage detected; capacitive means charged according to the output voltage from said voltage detecting means, said capacitive means storing a voltage which becomes higher than a predetermined voltage only when a voltage impulse is generated at the primary winding immediately after a constant coil current through the primary winding is rapidly interrupted; discharging means for causing said capacitive means to be discharged; and a comparator circuit for comparing the voltage charged on said capacitive means with said predetermined voltage to generate an output signal according to the result of the comparison.
Claim 3
Dependent Claim
50 words
An ignition detector circuit according to claim 1 wherein said comparator circuit generates an output signal of first level when the voltage charged on said capacitive means is larger than said reference voltage and an output signal of second level when said charged voltage is smaller than said reference voltage.
Claim 4
Dependent Claim
47 words
An ignition detector circuit according to claim 1 or 2 wherein said voltage detecting means comprises first and second resistors connected in series between said primary winding and a reference power source terminal and generates an output signal through the junction between said first and second resistors.
Claim 5
Dependent Claim
22 words
An ignition detector circuit according to claim 3 wherein said discharging means comprises a resistor connected in parallel with said capacitive means.
Claim 6
Dependent Claim
85 words
An ignition detector circuit according to claim 4 wherein said voltage detecting means further includes a third resistor whose one end is connected to the junction between said first and second resistors, and a constant voltage circuit connected to the other end of said third resistor and the reference power source terminal to keep the output voltage of said voltage detecting means at a predetermined voltage when a voltage appearing at the junction between said first and second resistors becomes larger than a predetermined value.
Claim 7
Dependent Claim
26 words
An ignition detector circuit according to claim 5 wherein said constant voltage circuit comprises a transistor to the base of which is applied a predetermined voltage.
Claim 8
Dependent Claim
42 words
An ignition detector circuit according to claim 3 wherein said voltage detecting means comprises a comparator having a first input terminal connected to the primary winding of said ignition coil and a second input terminal to which said reference voltage is applied.
Claim 9
Dependent Claim
22 words
An ignition detector circuit according to claim 7 wherein said discharging means comprises a resistor connected in parallel with said capacitive means.
Claim 10
Dependent Claim
15 words
An ignition detector circuit according to claim 8 wherein said comparator circuit has hysteresis characteristic.
Claim 11
Dependent Claim
15 words
An ignition detector circuit according to claim 7 wherein said comparator circuit has hysteresis characteristic.
Claim 12
Dependent Claim
85 words
An ignition detector circuit according to claim 3 wherein said voltage detecting means further includes a third resistor whose one end is connected to the junction between said first and second resistors, and a constant voltage circuit connected to the other end of said third resistor and the reference power source terminal to keep the output voltage of said voltage detecting means at a predetermined voltage when a voltage appearing at the junction between said first and second resistors becomes larger than a predetermined value.
Claim 13
Dependent Claim
26 words
An ignition detector circuit according to claim 11 wherein said constant voltage circuit comprises a transistor to the base of which is applied a predetermined voltage.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |