JPS57200826A - Knocking detecting device - Google Patents

Knocking detecting device

Info

Publication number
JPS57200826A
JPS57200826A JP8661981A JP8661981A JPS57200826A JP S57200826 A JPS57200826 A JP S57200826A JP 8661981 A JP8661981 A JP 8661981A JP 8661981 A JP8661981 A JP 8661981A JP S57200826 A JPS57200826 A JP S57200826A
Authority
JP
Japan
Prior art keywords
amplifier
output
knocking
filter
averaging circuit
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
JP8661981A
Other languages
Japanese (ja)
Inventor
Takeshi Tamura
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.)
NIHON DENSHI KIKI KK
Hitachi Unisia Automotive Ltd
Original Assignee
NIHON DENSHI KIKI KK
Japan Electronic Control Systems 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 NIHON DENSHI KIKI KK, Japan Electronic Control Systems Co Ltd filed Critical NIHON DENSHI KIKI KK
Priority to JP8661981A priority Critical patent/JPS57200826A/en
Publication of JPS57200826A publication Critical patent/JPS57200826A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Abstract

PURPOSE:To improve the knocking detecting accuracy, by generating a reference voltage in response to the output voltage of a filter which is based on the output voltage of a vibration sensor or passes the part other than a specified frequency band of the output signal of the vibration sensor. CONSTITUTION:The output of an amplifier 2 is connected to the filter 3 and an averaging circuit 5. The output of the filter 3 is connected to one input terminal of a comparator 6 through an amplifier 4. The output of the average circuit 5 is connected to the other input terminal of the comparator 6 through an amplifier 7. Since the output signal of the amplifier 2 includes the natural frequency component of an engine itself which is not related to the knocking, its S/N ratio is low. Since the output vibration signal from the amplifier 2 is rectified by the averaging circuit 5 in a half wave rectification mode, the waveform of the output signal of the averaging circuit 5 is smooth. Accordingly, the width of the knocking judging pulses which are generated when the output voltage of the amplifier 4 is larger than the reference voltage obtained by the amplifier 7 becomes the adequate width. Thus, the knocking detecting accuracy can be improved.
JP8661981A 1981-06-05 1981-06-05 Knocking detecting device Pending JPS57200826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8661981A JPS57200826A (en) 1981-06-05 1981-06-05 Knocking detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8661981A JPS57200826A (en) 1981-06-05 1981-06-05 Knocking detecting device

Publications (1)

Publication Number Publication Date
JPS57200826A true JPS57200826A (en) 1982-12-09

Family

ID=13892032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8661981A Pending JPS57200826A (en) 1981-06-05 1981-06-05 Knocking detecting device

Country Status (1)

Country Link
JP (1) JPS57200826A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63188571U (en) * 1987-05-28 1988-12-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63188571U (en) * 1987-05-28 1988-12-02

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