ENGINE SPEED LIMITATION CONTROL

摘要

A method for controlling an engine speed of an internal combustion engine of a hand held power tool such as a chain saw or cut off saw, preferably by controlling an ignition system of the engine, which ignition system has a primary firing pulse generator for charging a capacitor and an electronic switch for discharging the capacitor via an ignition coil to generate an ignition voltage, a microcomputer operating the switch to control the ignition timing of said generator, said microcomputer in communication with a speed detection means that detects the rotational speed of the engine and a speed limitation control to limit the engine speed to a limitation speed, wherein the speed limitation control is active or activated when an activation condition has been fulfilled, and the speed limitation control is deactivated when a deactivating condition(s) has been fulfilled.