JPS57163837A - Knocking sensor - Google Patents

Knocking sensor

Info

Publication number
JPS57163837A
JPS57163837A JP4863281A JP4863281A JPS57163837A JP S57163837 A JPS57163837 A JP S57163837A JP 4863281 A JP4863281 A JP 4863281A JP 4863281 A JP4863281 A JP 4863281A JP S57163837 A JPS57163837 A JP S57163837A
Authority
JP
Japan
Prior art keywords
diaphragm
magnet
resonance
weakening
oscillation
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
JP4863281A
Other languages
Japanese (ja)
Inventor
Kiyoshi Takeuchi
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP4863281A priority Critical patent/JPS57163837A/en
Publication of JPS57163837A publication Critical patent/JPS57163837A/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

Abstract

PURPOSE:To increase the band width of a resonance frequency by arranging a magnet close to a diaphragm, and thus weakening the resonance of the diaphragm and decreasing sharpness Q. CONSTITUTION:The end part of a diaphragm 1 formed by sticking a piezoelectric body 2 and a metallic plate 3 together is fixed to the cover 9A of a metallic fixture 8 with a bolt 6 formed in the same body with an external terminal 5 and a nut 7 through a retainer 4. On the internal surface 13 of a housing opposed to the tip of the diaphragm 1, a magnet 14 is arranged so that magnetic flux established by it faces the diaphragm 1. When the diaphragm 1 is energized, the tip of its oscillates vertically, but the magnetic flux of the magnet 14 is cut off intensely, so an eddy current is generated in the metallic plate 3 of the diaphragm 1. This eddy current flows in such a direction that the oscillation of the diaphragm 1 is suppressed, and also increases an equal ratio to the acceleration of the oscillation, thus weakening the resonance phenomenon of the diaphragm 1.
JP4863281A 1981-04-01 1981-04-01 Knocking sensor Pending JPS57163837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4863281A JPS57163837A (en) 1981-04-01 1981-04-01 Knocking sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4863281A JPS57163837A (en) 1981-04-01 1981-04-01 Knocking sensor

Publications (1)

Publication Number Publication Date
JPS57163837A true JPS57163837A (en) 1982-10-08

Family

ID=12808746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4863281A Pending JPS57163837A (en) 1981-04-01 1981-04-01 Knocking sensor

Country Status (1)

Country Link
JP (1) JPS57163837A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004262A1 (en) * 1993-08-03 1995-02-09 Nippondenso Co., Ltd. Knock sensor
US5635629A (en) * 1993-08-03 1997-06-03 Nippondenso Co., Ltd. Knock sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004262A1 (en) * 1993-08-03 1995-02-09 Nippondenso Co., Ltd. Knock sensor
US5635629A (en) * 1993-08-03 1997-06-03 Nippondenso Co., Ltd. Knock sensor

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