| 摘要 |
In a vehicle continuously variable transmission, an engine rotation speed, input rotation speed of the transmission and an output rotation speed of the transmission are respectively detected by sensors (64, 65, 68). Based on the output signals from these rotation speed sensors (64, 65, 68), a controller (61) controls a speed ratio of the transmission within a predetermined speed ratio range. The controller (61) also determines if any of the rotation speed sensors (64, 65, 68) has an abnormality based on the output signals from these sensors (64, 65, 68) and narrows the predetermined speed ratio range (S234) when any of the sensors has been determined to have an abnormality, so as to prevent an extraordinary speed ratio control from being performed. |
