JPS5663219A - Knocking detecting system - Google Patents

Knocking detecting system

Info

Publication number
JPS5663219A
JPS5663219A JP13879979A JP13879979A JPS5663219A JP S5663219 A JPS5663219 A JP S5663219A JP 13879979 A JP13879979 A JP 13879979A JP 13879979 A JP13879979 A JP 13879979A JP S5663219 A JPS5663219 A JP S5663219A
Authority
JP
Japan
Prior art keywords
circuit
signal
gate
ignition
timing
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
JP13879979A
Other languages
Japanese (ja)
Inventor
Hideyuki Tamura
Toshio Enoshima
Shoji Furuhashi
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 JP13879979A priority Critical patent/JPS5663219A/en
Publication of JPS5663219A publication Critical patent/JPS5663219A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Testing Of Engines (AREA)

Abstract

PURPOSE: To ensure an accurate detection of knocking, by resetting the holding signal of the noise level detecting means immediately after detection of occurrence of the knocking and then stopping temporarily the new sampling of the output singal of the vibration sensor.
CONSTITUTION: The 1st gate circuit 10 is turned on and off when the gate signal G1 supplied from the timing circuit 11 is at a high and low levels H and L respectively. And the timing and period during which the signal G1 becomes L are set so as to be identical to a fixed period right after the ignition. Thus the ignition noise N mixing into the signal Sa right after the ignition can be cut off and then eliminated by the 1st circuit 10. The 2nd gate circuit 5 and the averaging circuit 6 forming the noise level detecting circutit 4 are controlled by the gate signal G2 delivered from the timing circuit 11. The holding signal is average through the circuit 6, and the average value is held for the period during which the circuit 5 is turned off. And then the holding signal is reset with the rise of the signal G2.
COPYRIGHT: (C)1981,JPO&Japio
JP13879979A 1979-10-29 1979-10-29 Knocking detecting system Pending JPS5663219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13879979A JPS5663219A (en) 1979-10-29 1979-10-29 Knocking detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13879979A JPS5663219A (en) 1979-10-29 1979-10-29 Knocking detecting system

Publications (1)

Publication Number Publication Date
JPS5663219A true JPS5663219A (en) 1981-05-29

Family

ID=15230494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13879979A Pending JPS5663219A (en) 1979-10-29 1979-10-29 Knocking detecting system

Country Status (1)

Country Link
JP (1) JPS5663219A (en)

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