Development of Electronically Controlled CVT Focusing on Rider's Intention of Acceleration and Deceleration

Recently electronically controlled transmissions have been adopted in motorcycles, especially scooters. By such CVT (Continuously Variable Transmission), various shift modes and the manual control of the speed ratio are offered, and the rider can select the appropriate ratio according to the running situations and can draw the performance of the vehicle to the maximum. On the other hand, however, the rider's operation such as selecting modes tends to become complex. Due to the characteristic that two-wheeled vehicles require the rider to steer and control speed both by hands, it is preferred that the shifting systems should be operated as easily as possible so that the rider can concentrate on the driving operation. Therefore, we developed the electronically controlled belt-type CVT system for two-wheeled vehicles with a new concept that was able to achieve changing the speed ratio according to the rider's intention with only simple operation at the auto shift mode.