conical plate 42 a of the secondary pulley 42 the line pressure of the clutch pressure regulating unit 35 is regulated to a predetermined clutch pressure and is selectively supplied to the forward clutch 32 and reverse clutch 33 the primary pressure regulating unit 44 secondary pressure regulating unit 45 and line pressure regulating unit 46 respectively regulate the primary pressure secondary pressure and line pressure according to command signals from a controller 60 the clutch pressure regulating unit 35 supplies the oil pressure used for engaging a particular clutch according to the command signal from the controller 60 the controller 60 is composed of a microcomputer that comprises a central processing unit cpu read only memory rom random access memory ram and an input output interface i o interface the controller may also be composed of a plurality of microcomputers the controller 60 controls the primary pressure secondary pressure and line pressure and engages and releases the forward clutch 32 and reverse clutch 33 the controller 60 also controls the output torque of the engine 70 by outputting an engine control signal to an electronic throttle 61 provided in the engine 70 detected data from a rotation speed sensor 47 for detecting the rotation speed of the engine 70 a rotation speed sensor 51 for detecting the rotation speed of the primary pulley 41 a rotation speed sensor 52 for detecting the rotation speed of the secondary pulley 42 a pressure sensor 53 for detecting the primary pressure a pressure sensor 54 for detecting the secondary pressure an inhibitor switch 56 for detecting the selected position of the shift lever.