Patent ID: 7646157

Claim:
A method for controlling a driving tool having a power source, a driver, an actuator, a follower, and a control unit, the power source including a motor and a flywheel that is driven by the motor, the actuator operable for selectively moving the follower to push the driver into frictional engagement with a surface of the flywheel, the control unit operable for selectively activating the electric motor and the actuator, the control unit including a speed sensor that is configured to sense a rotational speed of an element of the power source and produce a speed signal in response thereto, the method comprising: directly determining a rotational speed of an element in the power source; controlling electrical power provided to the motor based on the rotational speed of the element in the power source to cause the flywheel to rotate at a predetermined speed; and actuating the actuator to move the follower when a set of actuating criteria has been met, the follower pushing the driver into contact with the surface of the flywheel as the flywheel is rotating.