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JPS6454227A - Knocking detector for engine - Google Patents

Knocking detector for engine

Info

Publication number
JPS6454227A
JPS6454227A JP21181487A JP21181487A JPS6454227A JP S6454227 A JPS6454227 A JP S6454227A JP 21181487 A JP21181487 A JP 21181487A JP 21181487 A JP21181487 A JP 21181487A JP S6454227 A JPS6454227 A JP S6454227A
Authority
JP
Japan
Prior art keywords
knocking
engine
peak level
filters
band pass
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
JP21181487A
Other languages
Japanese (ja)
Inventor
Hiroshi Hirano
Kazutomo Sasaki
Seiji Yashiki
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP21181487A priority Critical patent/JPS6454227A/en
Publication of JPS6454227A publication Critical patent/JPS6454227A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To enable positive detection of possible fine knocking with a higher S/N ratio in the detection of knocking, by providing a means to set a filter band of a band pass filter narrower and altering the filter band. CONSTITUTION:A knocking sensor 15 is mounted at a cylinder 2 portion of an engine 1 to detect vibration of the engine 1 and peak level of engine vibration signals passing through three band pass filters 17S1, 17M and 17S2 is detected with a peak level detection circuit 18. Then, a knocking frequency detection circuit 20 detects an actual frequency of generated knocking vibration from three peak level values and cutoff frequencies of three filters and a cutoff frequency alteration circuit 21 alters cutoff frequencies of the three filters. A knocking decision circuit 19 compares a peak level of an output of the band pass filter 17M with a reference value corresponding to the moment of generating a knocking a decide on the movement of generating knocking.
JP21181487A 1987-08-25 1987-08-25 Knocking detector for engine Pending JPS6454227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21181487A JPS6454227A (en) 1987-08-25 1987-08-25 Knocking detector for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21181487A JPS6454227A (en) 1987-08-25 1987-08-25 Knocking detector for engine

Publications (1)

Publication Number Publication Date
JPS6454227A true JPS6454227A (en) 1989-03-01

Family

ID=16612036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21181487A Pending JPS6454227A (en) 1987-08-25 1987-08-25 Knocking detector for engine

Country Status (1)

Country Link
JP (1) JPS6454227A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH048850A (en) * 1990-04-27 1992-01-13 Hitachi Ltd Knocking detecting means for internal combustion engine
JP2011140960A (en) * 2000-08-11 2011-07-21 Robert Bosch Gmbh Method and device for identifying knocking of internal combustion engine having at least one cylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH048850A (en) * 1990-04-27 1992-01-13 Hitachi Ltd Knocking detecting means for internal combustion engine
JP2011140960A (en) * 2000-08-11 2011-07-21 Robert Bosch Gmbh Method and device for identifying knocking of internal combustion engine having at least one cylinder

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