For the CVT (Continuously Variable Transmission), (1) dust protection measures for the transmission part are not adequate, and therefore, dust may cause the slider not to move smoothly, which may lead to loss of transmission ratio control. If in the worst case the transmission ratio is locked low, the electromagnetic clutch could remain unengaged, causing the vehicle to stall. (2) The type of the clutch is not appropriate, and depending on the way of operation, the clutch may remain the same, causing acceleration malfunction or transmission ratio change malfunction.