US4711214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-knocking control in internal combustion engine
Assignee: Denso Corp
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Filing: 1986-07-31
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Granted: 1987-12-08
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Expires: 2006-07-31
Abstract
Abstract In a system for controlling knocking in an internal combustion engine, a reference value to be compared with a knock sensor signal for determining the presence or absence of the knocking is corrected in accordance with the pattern of a distribution obtained by collecting the logarithmic transformation value of the maximum value of signal generated from the knock sensor signal within a predetermined engine rotational angle at an interval. This is based on the fact that the pattern of distribution represents the characteristic of knocking of the engine.
Inventors
- 👤 Koji Sakakibara
- 👤 Hiroshi Haraguchi
- 👤 Hideki Yukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:56
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1523; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
Apparatus for controlling knocking in an internal combustion engine, comprising: a knock sensor for generating a signal in response to the vibrations in said engine; means for measuring a predetermined magnitude of said knock sensor signal generated within a predetermined engine rotational angle at an interval thereby obtaining a plurality of said magnitudes; means for determining a pattern of distribution of a plurality of logarithmic values corresponding to said plurality of magnitudes; and means to control said engine to prevent said knocking in accordance with said distribution pattern.
Claim 2
Dependent Claim
88 words
Apparatus for controlling knocking in an internal combustion engine, comprising: a knock sensor for generating a signal in response to the vibrations in said engine; means for measuring a predetermined magnitude of said knock sensor signal generated within a predetermined engine rotational angle at an interval thereby obtaining a plurality of said magnitudes; means for determining a pattern of distribution of a plurality of logarithmic values corresponding to said plurality of magnitudes; and means to control said engine to prevent said knocking in accordance with said distribution pattern.
Claim 3
Dependent Claim
43 words
Apparatus is claimed in claim 1, wherein said knocking sensor comprises a microphone for converting a sound emitted from said engine to a corresponding electrical signal and a band-pass filter for passing only frequency component relating to knocking of said knock sensor signal.
Claim 4
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein said engine control means comprises means for controlling the ignition timing of said engine.
Claim 5
Dependent Claim
26 words
Apparatus as claimed in claim 1, wherein said engine control means comprises means for controlling the air-fuel ratio of mixture to be supplied to said engine.
Claim 6
Dependent Claim
14 words
Apparatus as claimed in claim 1, wherein said predetermined magnitude is a maximum value.
Claim 7
Dependent Claim
14 words
Apparatus as claimed in claim 1, wherein said predetermined magnitude is a mean value.
Claim 8
Dependent Claim
114 words
Apparatus for controlling knocking in an internal combustion engine, comprising: a knock sensor for generating a signal in response to the vibrations in said engine; means for determining the presence of knocking by comparing said knock sensor signal with a reference; means for controlling said engine to prevent said knocking in accordance with the determination; means for measuring a predetermined magnitude of said knock sensor signal generating within a predetermined engine rotational angle at an interval thereby obtaining a plurality of said magnitudes; means for determining a pattern of distribution of a plurality of logarithmic values corresponding to said plurality of magnitudes; and means for correcting said reference in accordance with said distribution pattern.
Claim 9
Dependent Claim
114 words
Apparatus for controlling knocking in an internal combustion engine, comprising: a knock sensor for generating a signal in response to the vibrations in said engine; means for determining the presence of knocking by comparing said knock sensor signal with a reference; means for controlling said engine to prevent said knocking in accordance with the determination; means for measuring a predetermined magnitude of said knock sensor signal generating within a predetermined engine rotational angle at an interval thereby obtaining a plurality of said magnitudes; means for determining a pattern of distribution of a plurality of logarithmic values corresponding to said plurality of magnitudes; and means for correcting said reference in accordance with said distribution pattern.
Claim 10
Dependent Claim
43 words
Apparatus as claimed in claim 7, wherein said knocking sensor comprises a microphone for converting a sound emitted from said engine to a corresponding electrical signal and a band-pass filter for passing only frequency component relating to knocking of said knock sensor signal.
Claim 11
Dependent Claim
21 words
Apparatus as claimed in claim 7, wherein said engine control means comprises means for controlling the ignition timing of said engine.
Claim 12
Dependent Claim
26 words
Apparatus as claimed in claim 7, wherein said engine control means comprises means for controlling the air-fuel ratio of mixture to be supplied to said engine.
Claim 13
Dependent Claim
14 words
Apparatus as claimed in claim 7, wherein said predetermined magnitude is a maximum value.
Claim 14
Dependent Claim
14 words
Apparatus as claimed in claim 7, wherein said predetermined magnitude is a mean value.
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |