公开(公告)号：JPH02257032A

公开(公告)日：1990-10-17

申请号：JP16649489

申请日：1989-06-28

Applicant: MARELLI AUTRONICA

Inventor： JINO PORITO ,  FURANKO MAROBERUCHI

IPC: F02B1/04 ,  F02D41/22 ,  G01L23/22 ,  G01M15/00

Abstract: PURPOSE: To obtain an excellent signal/noise ratio by providing a line which recognizes the first two peaks of pinking signals at the time of detecting the pinking of an internal combustion engine which occurs when an explosive mixture is exploded by automatic ignition and two monitoring lines which decide the level of noise. CONSTITUTION: A method and device for detecting pinking are based on the monitoring of a signal from a vibration-type acceleration sensor S in two bands, for example, 8kHz and 13.8kHz in which peaks indicating the presence of pinking appear. Then the signal component is compared with a noise component, but the executing method of this comparison varies depending upon whether or not the signal intensity detected in response to the second peak (13.8kHz) reaches a prescribed minimum level proportional to the signal intensity detected in response to the first peak (8kHz). When a noise signal component exceeds a noise component multiplied by a prescribed magnification, the occurrence of the pinking is indicated by adding an offset voltage.