US5263452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knocking detector for internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1992-11-25
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Granted: 1993-11-23
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Expires: 2012-11-25
Abstract
Abstract A knocking device for an internal combustion engine which detects the ionization current through an ignition coil just prior to the time of ignition, and judges whether or not the ionization current is above a predetermined level after a predetermined time or crank angle from the ignition. If the ionization current is above the predetermined level, it is judged that knocking has taken place. Accordingly, knocking can be detected simply and surely.
Inventors
- 👤 Toshio Ohsawa
- 👤 Wataru Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:37
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/22; G01L23/221; F; F02; F02D; F02D41/00; F02D41/22; F02P; F02P17/00; F02P17/12; F02P5/00; F02P5/04; F02P5/05; F02P5/14; F02P2017/125; F02P2017/128
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
98 words
A knocking detector for an internal combustion engine comprising: an ignition coil for generating a high voltage for igniting said internal combustion engine; a spark plug for firing a mixed gas in said internal combustion engine by being applied said high ignition voltage to thereby generate a spark at an ignition timing; ionization current detecting means for detecting an ionization current through said ignition coil; and knocking judging means for judging that knocking has taken place from whether or not said ionization current is above a predetermined level after a predetermined time has elapsed from said ignition timing.
Claim 2
Dependent Claim
98 words
A knocking detector for an internal combustion engine comprising: an ignition coil for generating a high voltage for igniting said internal combustion engine; a spark plug for firing a mixed gas in said internal combustion engine by being applied said high ignition voltage to thereby generate a spark at an ignition timing; ionization current detecting means for detecting an ionization current through said ignition coil; and knocking judging means for judging that knocking has taken place from whether or not said ionization current is above a predetermined level after a predetermined time has elapsed from said ignition timing.
Claim 3
Dependent Claim
97 words
A knocking detector for an internal combustion engine comprising: an ignition coil for generating a high voltage for igniting said internal combustion engine; a spark plug for firing a mixed gas in said internal combustion engine by being applied said high ignition voltage to thereby generate a spark at an ignition timing; ionization current detecting means for detecting an ionization current through said ignition coil; and knocking judging means for judging that knocking has taken place from whether or not said ionization current is above a predetermined level after a predetermined crank angle from said ignition timing.
Claim 4
Dependent Claim
97 words
A knocking detector for an internal combustion engine comprising: an ignition coil for generating a high voltage for igniting said internal combustion engine; a spark plug for firing a mixed gas in said internal combustion engine by being applied said high ignition voltage to thereby generate a spark at an ignition timing; ionization current detecting means for detecting an ionization current through said ignition coil; and knocking judging means for judging that knocking has taken place from whether or not said ionization current is above a predetermined level after a predetermined crank angle from said ignition timing.
Claim 5
Dependent Claim
20 words
The knocking detector according to claim 2, wherein said predetermined crank angle is in a range of 10° to 20°.
Claim 6
Dependent Claim
21 words
The knocking detector according to claim 1, wherein said high ignition voltage is in a range of 10 to 25 kV.
Claim 7
Dependent Claim
21 words
The knocking detector according to claim 2, wherein said high ignition voltage is in a range of 10 to 25 kV.
Claim 8
Dependent Claim
30 words
The knocking detector according to claim 1, wherein said ionization current detecting means comprising a capacitor which has an effect of biasing in a range of 50 to 300 V.
Claim 9
Dependent Claim
30 words
The knocking detector according to claim 2, wherein said ionization current detecting means comprising a capacitor which has an effect of biasing in a range of 50 to 300 V.
Claim 10
Dependent Claim
19 words
The knocking detector according to claim 1, wherein said ignition coil, comprising: a primary side and a second side.
Claim 11
Dependent Claim
79 words
The knocking detector according to claim 8, wherein said ionization current detecting means, comprising: a capacitor, a resistor inserted between said capacitor and a ground, a first diode inserted between said secondary side and a detector power, a secondary diode connected to said resistor, an AC coupler circuit for extracting only an AC component out of said voltage, a comparator circuit for comparing said AC component with a predetermined reference level, a microcomputer for effecting various types of control.
Claim 12
Dependent Claim
17 words
The knocking detector according to claim 8, wherein said secondary side is connected to a power diode.
Claim 13
Dependent Claim
15 words
The knocking detector according to claim 9, wherein said first diode is a Zener diode.
Claim 14
Dependent Claim
19 words
The knocking detector according to claim 2, wherein said ignition coil, comprising: a primary side and a second side.
Claim 15
Dependent Claim
79 words
The knocking detector according to claim 12, wherein said ionization current detecting means, comprising: a capacitor, a resistor inserted between said capacitor and a ground, a first diode inserted between said secondary side and a detector power, a secondary diode connected to said resistor, an AC coupler circuit for extracting only an AC component out of said voltage, a comparator circuit for comparing said AC component with a predetermined reference level, a microcomputer for effecting various types of control.
Claim 16
Dependent Claim
17 words
The knocking detector according to claim 12, wherein said secondary side is connected to a power diode.
Claim 17
Dependent Claim
15 words
The knocking detector according to claim 13, wherein said first diode is a Zener diode.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |