| 摘要 |
<p>A control system for a continuously variable transmission provided with a first pully (1) having two pulley discs (5,7), with a second pulley (2) having two pulley discs (6,8) and with a drive belt (10) wound around said pulleys (1,2) for transmitting torque there between, at least one disc (7) of the first pulley (1) being axially movable with respect to the other disc (5) of said pulley (1) under the influence of an axial force provided on said movable disc (7) by a line pressure (PLP) in a cylinder (11) of a piston/cylinder assembly (11,13) associated with the said first pulley (1) and at least one disc (6) of the second pulley (2) being axially movable with respect to the other disc (8) of said pulley (2) under the influence of an axial force provided on said movable disc (8) by a second cylinder pressure (P2CP) in a cylinder (12) of a piston/cylinder assembly (12,14) associated with the said second pulley (2). The control system is arranged to control the second cylinder pressure (P2CP) between two pressure levels (PLP;PR) by means of a second valve (32) that is influenced not only by a control pressure (PC,25), but also by the second cylinder pressure (P2CP), through feedback line (28). <IMAGE></p> |
