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Patent US5222393A successfully refreshed from Google Patents.
US5222393A
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Apparatus for detecting combustion in an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1992-10-20
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Granted: 1993-06-29
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Expires: 2012-10-20
Abstract
Abstract An apparatus for detecting combustion in an internal combustion engine which comprises: a plurality of cylinders wherein an ignition control is performed being synchronized with a revolution number of the internal combustion engine; and an ionic current detector installed at an ignition plug of at least one cylinder of the plurality of cylinders; the ionic current detector including a device for generating a voltage which corresponds to a level of an ionic current generated by the ignition plug, a device for generating a threshold value which is a combustion determining standard, and a comparator which generates an output signal that shows a combustion state, by comparing the voltage with the threshold value; the device for generating a threshold value is composed of a threshold level variable circuit which generates a threshold value corresponding to a running condition of the engine.
Inventors
- 👤 Toshio Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:43
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/12; F02B; F02B1/00; F02B1/02; F02B1/04; F02P2017/125
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
181 words
An apparatus for detecting combustion in an internal engine, comprising: a plurality of cylinders, wherein ignitions control is performed in synchronization with a revolution number of the internal combustion engine; and an ionic current detector installed at an ignition plug of at least one of the plurality of cylinders; said ionic current detector including means for generating a voltage which corresponds to a level of an ionic current generated by the ignition plug, means for generating a threshold value corresponding to a combustion determining standard, and a comparator for generating an output signal indicative of a combustion state, by comparing the voltage with the threshold value; said means for generating a threshold value comprising a threshold level variable circuit which generates a threshold value corresponding to a running condition of the engine, wherein said threshold level variable circuit includes means for generating a first threshold value when said engine has steady state running condition, and for generating a second threshold value when said engine has a non-steady stage running condition, said first threshold value being less than said second threshold value.
Claim 2
Independent Claim
181 words
An apparatus for detecting combustion in an internal engine, comprising: a plurality of cylinders, wherein ignitions control is performed in synchronization with a revolution number of the internal combustion engine; and an ionic current detector installed at an ignition plug of at least one of the plurality of cylinders; said ionic current detector including means for generating a voltage which corresponds to a level of an ionic current generated by the ignition plug, means for generating a threshold value corresponding to a combustion determining standard, and a comparator for generating an output signal indicative of a combustion state, by comparing the voltage with the threshold value; said means for generating a threshold value comprising a threshold level variable circuit which generates a threshold value corresponding to a running condition of the engine, wherein said threshold level variable circuit includes means for generating a first threshold value when said engine has steady state running condition, and for generating a second threshold value when said engine has a non-steady stage running condition, said first threshold value being less than said second threshold value.
Claim 3
Dependent Claim
26 words
An apparatus according of claim 1, wherein said threshold value generating means increases the threshold value corresponding to the engine revolution number or the engine load.
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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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |