Patent ID: 6947828
Filing Date: 2005-09-20
Classification: F02D,F02P,G01L,Y02T

Abstract:
1. A knock control system for an internal combustion engine having a plurality of cylinders, operation of said engine being switchable between a partial-cylinder operation for operating some of said cylinders and an all-cylinder operation for operating all of said cylinders, the system comprising: a knock sensor mounted on said engine; determination threshold setting means for setting a determination threshold to determine knocking according to an output signal from said knock sensor; knocking determination means for comparing a level of the output signal from said knock sensor with the determination threshold, and for determining occurrence of knocking according to a result of the comparison; and control means for controlling at least one operating parameter of said engine according to a result of the determination by said knocking determination means, wherein said determination threshold setting means sets the determination threshold used during the partial-cylinder operation to a value which is less than a value of the determination threshold used during the all-cylinder operation.