Knocking suppression apparatus for an internal combustion engine

摘要

A knocking suppression apparatus for an internal combustion engine has a noise removal circuit which is disposed between an acceleration sensor, which senses engine knocking, and a phase shifter, which controls the ignition timing of the engine. The noise removal circuit includes a switch which can be opened and closed to prevent signals from being input to the phase shifter, and a window comparator. When the window comparator determines that the output of the acceleration sensor contains high-level noise signals, the noise removal circuit opens the switch for a prescribed period to prevent the high-level noise signals from being input to the phase shifter and influencing the ignition timing.