Lowe, Price, LeBlanc & Becker
System and method for controlling ignition timing to suppress engine knocking using periodic pseudo random signal
 A system and method for controlling ignition timing for an internal combustion engine to suppress engine knocking in which a periodic pseudo random signal (for example, M-series sequence signal) is superimposed on an ignition signal provided at an ignition timing, and a cross-correlation function between the periodic pseudo random signal .chi. and a knocking signal y is calculated to determine an actual knocking level. The ignition timing is then corrected so that the cross-correlation function coincides with a target value which is defined as a value placed in a vicinity of a knocking limit. The ignition timing for the engine is controlled so as to reach the value in the vicinity of the knocking limit but does not exceed the knocking limit. 
Nissan Motor Company, Limited
Y F
Y02T F02P
additional inventional
Nobuo Kenji Masaaki
Kurihara Ikeura Saito