Method of controlling selective four-wheel drive transmission system for all-terrain vehicle

A method of controlling a selective four-wheel drive transmission system for an all-terrain vehicle, said selective four-wheel drive transmission system including a front transmission system for transmitting driving power to front wheels, a rear transmission system for transmitting driving power to rear wheels, a dog clutch including a stationary member provided with teeth and a moving member provided with teeth, and included in either the front transmission system or the rear transmission system so as to be engaged or disengaged to set the selective four-wheel drive transmission system selectively for a four-wheel drive mode or a two-wheel drive mode, an electric actuator for moving the moving member of the dog clutch between an engaging position and a disengaging position, a position sensor incorporated into the electric actuator and capable of determining a position where the moving member is situated, and a controller for controlling the electric actuator, said method comprising the steps of:

• determining a position of the moving member of the dog clutch by the position sensor;
• sending a position signal representing the position of the moving member of the dog clutch and provided by the position sensor to the controller;
• and
• controlling the position of the moving member of the dog clutch on the basis of the position signal by the controller.