公开(公告)号：EP0125820A3

公开(公告)日：1985-11-21

申请号：EP84302753

申请日：1984-04-24

申请人： LUCAS INDUSTRIES public limited company

发明人： Skerritt, Robert Charles

IPC分类号： F02C07/266 ,  F02P15/00 ,  F02C09/00

CPC分类号： F02C7/266 ,  F02P15/003 ,  F02P17/12

摘要： The monitoring arrangement is used with a spark ignition system (10,13) in which the spark discharge current oscillates at a known frequency, and includes a sonic sensor (30) accoustically coupled to the spark igniter (13), a detector circuit (33, 35, 37, 38) responsive only to signals from the sensor (30) which have a frequency substantially equal to that of the spark discharge current, and an indicating device (43) responsive to an output signal from the detector circuit (33, 35, 37, 38).