Patent US2580127A successfully refreshed from Google Patents.
US4770144A
Expired / Lapsed
US
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Knock control apparatus and method for internal combustion engines
Assignee: Denso Corp
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Filing: 1987-08-05
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Granted: 1988-09-13
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Expires: 2007-08-05
Abstract
Abstract A knock control apparatus for an internal combustion engine which prevents variation of a control knock sound even if an output of a knock sensor is varied due to the variations in performance among different engines or knock sensors, aging of the engine or knock sensor or the like. A given correction quantity is added to an average value of an output signal of the knock sensor, and the sum is increased K times by a K-value varying with the operating conditions of the engine, thereby generating a knock discrimination level. In accordance with the presence or absence of knocking determined by comparing the knock discrimination level and an output signal of the knock sensor, a knock control factor, e.g., ignition timing, supercharge pressure or the like of the engine is controlled.
Inventors
- 👤 Koji Sakakibara
- 👤 Seiitirou Nishikawa
- 👤 Hiroshi Haraguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:12
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1525; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
A knock control apparatus for an internal combustion engine comprising: a knock sensor for detecting the occurrence of knocking in an engine; average value generating means for determining an average value of an output signal of said knock sensor; average value correcting means for adding a predetermined correction quantity to said average value determined by said average value generating means; knock discrimination level generating means for increasing said corrected average value determined by said average value correcting means by K times by a K-value to generate a knock discrimination level; knock discrimination means for comparing the knock discrimination level generated by said knock discrimination level generating means and an output signal of said knock sensor to determine the presence or absence of knocking; and driver means responsive to a discrimination result of said knock discriminating means to control a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine.
Claim 2
Dependent Claim
157 words
A knock control apparatus for an internal combustion engine comprising: a knock sensor for detecting the occurrence of knocking in an engine; average value generating means for determining an average value of an output signal of said knock sensor; average value correcting means for adding a predetermined correction quantity to said average value determined by said average value generating means; knock discrimination level generating means for increasing said corrected average value determined by said average value correcting means by K times by a K-value to generate a knock discrimination level; knock discrimination means for comparing the knock discrimination level generated by said knock discrimination level generating means and an output signal of said knock sensor to determine the presence or absence of knocking; and driver means responsive to a discrimination result of said knock discriminating means to control a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1, wherein said K-value is varied in accordance with at least one operating condition of said engine.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 2, wherein said correction quantity is set to a small value near to a resolution of said average value.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 3, wherein said correction quantity is a value preliminarily determined to correct a computing error.
Claim 6
Dependent Claim
167 words
A knock control apparatus for an internal combustion engine comprising: a knock sensor for detecting the occurrence of knocking in an engine; average value generating means for digitally determining an average value of an output signal of said knock sensor; correction quantity setting means having a predetermined correction quantity to correct a computing error; knock discrimination level generating means for increasing both the average value determined by said average value generating means and said correction quantity by K times by a K-value varying in accordance with at least one operating condition of said engine to generate a knock discrimination level; knock discrimination means for comparing the knock discrimination level generated by said knock discrimination level generating means and an output signal of said knock sensor to determine the presence or absence of knocking; and driver means responsive to a discrimination result of said knock discriminating means to control a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine.
Claim 7
Dependent Claim
167 words
A knock control apparatus for an internal combustion engine comprising: a knock sensor for detecting the occurrence of knocking in an engine; average value generating means for digitally determining an average value of an output signal of said knock sensor; correction quantity setting means having a predetermined correction quantity to correct a computing error; knock discrimination level generating means for increasing both the average value determined by said average value generating means and said correction quantity by K times by a K-value varying in accordance with at least one operating condition of said engine to generate a knock discrimination level; knock discrimination means for comparing the knock discrimination level generated by said knock discrimination level generating means and an output signal of said knock sensor to determine the presence or absence of knocking; and driver means responsive to a discrimination result of said knock discriminating means to control a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine.
Claim 8
Dependent Claim
18 words
An apparatus according to claim 5, wherein said operating condition for varying said K-value is an engine speed.
Claim 9
Dependent Claim
24 words
An apparatus according to claim 5, wherein said correction quantity is set to a small value near to a resolution of said average value.
Claim 10
Dependent Claim
117 words
A knock control method for an internal combustion engine, comprising the steps of: detecting occurrence of knocking in an engine; digitally computing an average value of a knock detecting output signal; producing a knock discrimination level by increasing both the average value determined and a predetermined correction quantity to correct a computing error by K times by a K-value varying with a change in operating condition of said engine; determining presence or absence of knocking by comparing the knock discrimination level and a current knock detecting output signal; and controlling a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine in response to the result of the determination.
Claim 11
Dependent Claim
117 words
A knock control method for an internal combustion engine, comprising the steps of: detecting occurrence of knocking in an engine; digitally computing an average value of a knock detecting output signal; producing a knock discrimination level by increasing both the average value determined and a predetermined correction quantity to correct a computing error by K times by a K-value varying with a change in operating condition of said engine; determining presence or absence of knocking by comparing the knock discrimination level and a current knock detecting output signal; and controlling a knock control factor including at least one of an ignition timing and a supercharge pressure of said engine in response to the result of the determination.
Claim 12
Dependent Claim
47 words
A method according to claim 8, comprising the further steps of changing amplification degree to amplify and A-D convert the knock detecting output signal and changing numbers of digits representing the computed average value and the knock in response to the magnitude of the knock discrimination level.
Claim 13
Dependent Claim
125 words
A method according to claim 8, comprising the further steps of (1) periodically A-D converting the knock detecting output signal in a given interval and adapting the converted signal V ADi according to the following equation, ##EQU3## where V MADi-1 represents an adapted signal value up to the preceding event, V MADi a current adapted value and A a given constant; (2) computing the average value V MEAN according to the following equation, ##EQU4## where V MAD represents of a resultant value of the adaptation, V MEANi-1 a mean value up to the preceding event and B a given constant; and (3) producing the knock discrimination level V LEV according to the following equation, V.sub.LEV =K(V.sub.MEAN +V.sub.MOS) where V MOS represents the predetermined correction quantity.
Claim 14
Dependent Claim
40 words
A method according to claim 8, comprising the further step of A-D converting each one cycle sine-wave of the knock detecting signal with a given delay time after detecting a rise portion of the signal above a given threshold level.
Claim 15
Dependent Claim
63 words
A method according to claim 8, comprising the further steps of A-D converting the knock detecting output signal, comparing the converted signal with the knock discrimination level, detecting the frequency of the converted signal when the converted signal exceeds the discrimination level, and detecting a knock intensity with the detected frequency by referring to frequency-intensity tables predetermined according to ranges of engine speed.
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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |