Development of pneumatically automatic mechanical transmission for a pure electric garbage truck

The pneumatically automatic mechanical transmission (AMT) system has been developed for a pure electric garbage truck. The buildup principle and control framework of the pneumatically AMT is introduced. In order to realize the coordinate control, the CAN (Controller Area Network) bus technology is adopted to realize the communications of AMT electric control unit (ECU) and induction motor controller (MC), and then the control of the motor´s rotate speed and torque is realized with the instructions from AMT system. Owing to the speed control of the induction machine during the period of the gear-shifting, the synchronization is always guaranteed. Furthermore, the time of shifting to target gear is reduced greatly using the pneumatically automatic mechanical transmission system. All those shorten the whole shifting time. The experimental results show that pneumatic gear-selecting and gear-shifting is quick and reliable and proposed pneumatically AMT improves some performances of the vehicle.