JPS57146121A - Discriminating device for knocking of internal combustion engine - Google Patents

Discriminating device for knocking of internal combustion engine

Info

Publication number
JPS57146121A
JPS57146121A JP3165281A JP3165281A JPS57146121A JP S57146121 A JPS57146121 A JP S57146121A JP 3165281 A JP3165281 A JP 3165281A JP 3165281 A JP3165281 A JP 3165281A JP S57146121 A JPS57146121 A JP S57146121A
Authority
JP
Japan
Prior art keywords
knocking
frequency
signal
combustion engine
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3165281A
Other languages
Japanese (ja)
Inventor
Shogo Kawashiri
Hideo Sofue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Tokushu Togyo KK
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Nippon Tokushu Togyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd, Nippon Tokushu Togyo KK filed Critical NGK Spark Plug Co Ltd
Priority to JP3165281A priority Critical patent/JPS57146121A/en
Publication of JPS57146121A publication Critical patent/JPS57146121A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Engines (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To enable easy and reliable discriminating of the presence of knocking, by a method wherein a difference in level between a signal component of a knocking frequency and a signal component of a noise frequency at the high- pass side of the frequency. CONSTITUTION:Vibration due to combustion explosion of an internal combustion engine is detected by a piezo-electric element 1, and the output signal thereof is inputted to a reducer 3 via a filter 2a, extracting a signal of a knocking frequency (7.5-8.5K Hz), and a filter 2b for extracting a noise frequency (9- 10K Hz) at a high-pass side of the knocking frequency. A level difference signal between the two signals is compared with a reference level by a comparator 4, and if the level difference exceeds 4dB, a knocking pulse is inputted to a counter 7 via an AND circuit 5 in synchronism with a signal of a timer 5, and a counting value is displayed in a displaying device 8. This causes reliable discriminating of the presence of knocking.
JP3165281A 1981-03-05 1981-03-05 Discriminating device for knocking of internal combustion engine Pending JPS57146121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3165281A JPS57146121A (en) 1981-03-05 1981-03-05 Discriminating device for knocking of internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3165281A JPS57146121A (en) 1981-03-05 1981-03-05 Discriminating device for knocking of internal combustion engine

Publications (1)

Publication Number Publication Date
JPS57146121A true JPS57146121A (en) 1982-09-09

Family

ID=12337098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3165281A Pending JPS57146121A (en) 1981-03-05 1981-03-05 Discriminating device for knocking of internal combustion engine

Country Status (1)

Country Link
JP (1) JPS57146121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881401A (en) * 1987-03-04 1989-11-21 Lucas Industries Public Limited Company Knock detection system
WO2007004451A1 (en) * 2005-06-30 2007-01-11 Toyota Jidosha Kabushiki Kaisha Knocking determination device for internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881401A (en) * 1987-03-04 1989-11-21 Lucas Industries Public Limited Company Knock detection system
WO2007004451A1 (en) * 2005-06-30 2007-01-11 Toyota Jidosha Kabushiki Kaisha Knocking determination device for internal combustion engine
US7621172B2 (en) 2005-06-30 2009-11-24 Toyota Jidosha Kabushiki Kaisha Knocking determination device for internal combustion engine

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