JPS57186126A - Knock detector - Google Patents

Knock detector

Info

Publication number
JPS57186126A
JPS57186126A JP7092681A JP7092681A JPS57186126A JP S57186126 A JPS57186126 A JP S57186126A JP 7092681 A JP7092681 A JP 7092681A JP 7092681 A JP7092681 A JP 7092681A JP S57186126 A JPS57186126 A JP S57186126A
Authority
JP
Japan
Prior art keywords
knock
output
specific frequency
amplitude level
threshold value
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
JP7092681A
Other languages
Japanese (ja)
Inventor
Satoru Kabasawa
Hidekazu Tsuboka
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.)
Toyota Motor Corp
Panasonic Holdings Corp
Original Assignee
Toyota Motor Corp
Matsushita Electric Industrial Co Ltd
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 Toyota Motor Corp, Matsushita Electric Industrial Co Ltd filed Critical Toyota Motor Corp
Priority to JP7092681A priority Critical patent/JPS57186126A/en
Publication of JPS57186126A publication Critical patent/JPS57186126A/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector

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)
  • Testing Of Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

PURPOSE:To achieve accurate knock detection by deciding on a threshold value easily without paying attention to the influence of an increase in amplitude level caused by some factor except a knock, by finding the amount of variation in amplitude level in the specific frequency band of an oscillation signal. CONSTITUTION:The vibration of an internal combustion engine is transduced into an electric signal by an electric signal trnsducing part 1, and an amplitude level at specific frequency is extracted by a specific frequency extraction part 2. A sampling part 3 samples the output of the specific frequency extraction part 2 at constant intervals of time to output sampled values Si successively. A variation amount calculation part 4 sends out the absolute value di=¦Si-Si-1¦ of a difference between the last output Si-1 and new output Si of the sampling part 3. A knock discrimination part 5 detects a knock when the output di of the variation amount calculation part 4 surpasses a predetermined threshold value, and then outputs a knock detection signal.
JP7092681A 1981-05-12 1981-05-12 Knock detector Pending JPS57186126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7092681A JPS57186126A (en) 1981-05-12 1981-05-12 Knock detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7092681A JPS57186126A (en) 1981-05-12 1981-05-12 Knock detector

Publications (1)

Publication Number Publication Date
JPS57186126A true JPS57186126A (en) 1982-11-16

Family

ID=13445595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7092681A Pending JPS57186126A (en) 1981-05-12 1981-05-12 Knock detector

Country Status (1)

Country Link
JP (1) JPS57186126A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277535A (en) * 1986-03-28 1987-12-02 ソシエテ、デテユ−ド・ドウ・マシ−ヌ・テルミツク・エス．ウ．エム．テ−． Method of monitoring operation of internal combustion engineunder usage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54141180A (en) * 1978-04-24 1979-11-02 Nippon Soken Knocking detector for internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54141180A (en) * 1978-04-24 1979-11-02 Nippon Soken Knocking detector for internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277535A (en) * 1986-03-28 1987-12-02 ソシエテ、デテユ−ド・ドウ・マシ−ヌ・テルミツク・エス．ウ．エム．テ−． Method of monitoring operation of internal combustion engineunder usage

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