US4899715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition device for internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1988-09-26
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Granted: 1990-02-13
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Expires: 2008-09-26
Abstract
Abstract An ignition device for an internal combustion engine includes a transistor circuit used to turn a primary current of an ignition coil on and off to produce a high voltage for spark ignition. A reference voltage generator produces a temperature compensated reference voltage. A primary current detecting circuit produces a voltage corresponding to a primary current of the ignition coil. A comparator compares the temperature compensated reference voltage with the voltage produced by the primary current detecting circuit. A control circuit responsive to an output of the comparator controls a base voltage of the transistor circuit to a predetermined constant value.
Inventors
- 👤 Mitsuru Koiwa
- 👤 Kouichi Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:10
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/05; F02P3/051
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
An ignition device for an internal combustion engine having transistor means for controlling a primary current of an ignition coil to produce a high voltage for spark ignition, comprising: a reference voltage generator for producing a temperature compensated reference voltage which is independent of a source voltage; a primary current detecting circuit for producing a voltage corresponding to said primary current of the ignition coil; a comparator for comparing said temperature compensated reference voltage with said voltage produced by said primary current detecting circuit; and a control circuit responsive to an output of said comparator to control a base voltage of said transistor means to a predetermined constant value.
Claim 2
Dependent Claim
109 words
An ignition device for an internal combustion engine having transistor means for controlling a primary current of an ignition coil to produce a high voltage for spark ignition, comprising: a reference voltage generator for producing a temperature compensated reference voltage which is independent of a source voltage; a primary current detecting circuit for producing a voltage corresponding to said primary current of the ignition coil; a comparator for comparing said temperature compensated reference voltage with said voltage produced by said primary current detecting circuit; and a control circuit responsive to an output of said comparator to control a base voltage of said transistor means to a predetermined constant value.
Claim 3
Dependent Claim
31 words
The ignition device as claimed in claim 1, further comprising an actuation circuit for actuating said comparator only when the primary current of the ignition coil increases above a predetermined value.
Claim 4
Dependent Claim
26 words
The ignition device as claimed in claim 1 or 2, wherein said reference voltage generator comprises a current mirror circuit and a pair of transistor circuits.
References Cited (Backward Citations)
US4245610A
Cited
US4267813A
Cited
US4248200A
Cited
US4356807A
Cited
US4359038A
Cited
US4402299A
Cited
US4469082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |