Measuring solenoid opening and closing times to control solenoid valve

摘要

Disclosed is an internal combustion engine hand tool for driving in fastening elements such as nails or staples under the action of the combustion of a driving fuel in an engine combustion chamber upon a shot of the tool. The fuel is transferred to the chamber from a fuel cartridge (16) by an electric fuel intake device (1). The fuel intake device comprises a valve which, upon each shot, opens in an intake position under the action of a current (lA) in a component, the current being created by a voltage injection control signal (UV). The tool further comprises a current measurement member (3) in series with the fuel intake electric device (1) and a microcontroller (2) arranged for receiving the output signal of the current measurement member (3) and the control signal (UV) for the intake device (1). The microcontroller (2) further computes the opening time of the fuel intake device (1).