CONTROL VALVE FOR A CONTROL SYSTEM OF A CONTINUOUSLY VARIABLE DRIVING BELT TRANSMISSION

摘要

A control valve system for a continuously variable belt transmission for an internal combustion engine comprising a main control valve acted upon by a force related to the transmission ratio and the rotational speed of the primary shaft, a transmission ratio control valve acted upon by a force related to the desired calibrated rotational speed of the engine and of the primary shaft, and an auxiliary valve connected mechanically to the transmission ratio control valve, the auxiliary valve (15) being acted upon by means of an electromagnetic pressure regulator (21) as a function of a selected characteristic relationship of desired rotational speeds for different operating conditions in an electronic control unit.