Patent ID: 8701957

Claim:
A controlling method for an internal combustion engine hand tool, for driving in a supporting material fastening elements under an action, upon a shot, of firing, in a combustion chamber of the engine, of a driving fuel transferred in the chamber from a fuel cartridge by a fuel intake electric device comprising a valve which, upon each shot, opens in an intake position, under action of a current (I A ) in a component created by a voltage injection control signal (U v ), wherein upon a first one of a series of shots and after a beginning of the control signal, a time t o is detected of a drop of current during a transient rise of current and, an opening period T o of the valve being predetermined, an end of the injection control signal is triggered at a time t d , after the period T o , following the time t o , reduced with a period T OFF , of a first rise of the voltage injection control signal following a beginning of the drop of the current signal in said component or the rise, following the beginning of the drop thereof, of the current signal in said component.