摘要 |
A continuously variable belt drive transmission has a torque converter (3) with a lockup clutch (15). The transmission ratio of the transmission starts is changed, and the lockup clutch is engaged, in accordance with driving conditions of the vehicle. Thus, a start signal for starting of the changing of the transmission ratio is produced in accordance with driving conditions, and a lockup signal for engaging of the lockup clutch is produced in accordance with driving conditions by a control unit (80). In response to the start signal and to the lockup signal, the changing of the transmission ratio and engagement of the lockup clutch are performed after a time delay by means of transmission ratio valve (45) and lockup control valve (63), respectively. |