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JPS56119826A - Knocking detector for internal combustion engine - Google Patents

Knocking detector for internal combustion engine

Info

Publication number
JPS56119826A
JPS56119826A JP2456380A JP2456380A JPS56119826A JP S56119826 A JPS56119826 A JP S56119826A JP 2456380 A JP2456380 A JP 2456380A JP 2456380 A JP2456380 A JP 2456380A JP S56119826 A JPS56119826 A JP S56119826A
Authority
JP
Japan
Prior art keywords
knocking
resonance
piezoelectric elements
detector
elements
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
JP2456380A
Other languages
Japanese (ja)
Inventor
Kimiaki Yamaguchi
Tadashi Hattori
Yoshinori Otsuka
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.)
Soken Inc
Original Assignee
Nippon Soken Inc
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 Nippon Soken Inc filed Critical Nippon Soken Inc
Priority to JP2456380A priority Critical patent/JPS56119826A/en
Publication of JPS56119826A publication Critical patent/JPS56119826A/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
    • G01L23/222—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 using piezoelectric devices

Landscapes

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

Abstract

PURPOSE:To expand the width of frequency detection, to improve an S/N ratio and to improve sensitivity by providing plural resonance points in a knocking frequency band by each piezoelectric vibration detector. CONSTITUTION:Components 21a-21d are piezoelectric vibration detecting platelike elements having resonance frequencies in either one of 4-10kHz or 11-13kHz knocking frequency; they are stacked and their one-side ends are fixed to projected part 22c by screws 26 and press plate 25. Detector 2 is fitted tightly to an engine block and knocking vibrations are transmitted to respective piezoelectric elements 21a-21c via housing 22. Since piezoelectric elements 21a-21c are connected in series, an electric signal with three composite resonance characteristics is led out. The number of the resonance characteristics depends upon the number of the piezoelectric elements, and knocking can easily be detected with high sensitivity over the entire knocking frequency band by providing proper resonance points.
JP2456380A 1980-02-27 1980-02-27 Knocking detector for internal combustion engine Pending JPS56119826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2456380A JPS56119826A (en) 1980-02-27 1980-02-27 Knocking detector for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2456380A JPS56119826A (en) 1980-02-27 1980-02-27 Knocking detector for internal combustion engine

Publications (1)

Publication Number Publication Date
JPS56119826A true JPS56119826A (en) 1981-09-19

Family

ID=12141615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2456380A Pending JPS56119826A (en) 1980-02-27 1980-02-27 Knocking detector for internal combustion engine

Country Status (1)

Country Link
JP (1) JPS56119826A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727279A (en) * 1987-04-29 1988-02-23 General Motors Corporation Piezoelectric knock sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727279A (en) * 1987-04-29 1988-02-23 General Motors Corporation Piezoelectric knock sensor

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