In order to realize the transmission efficiency testing of mini mechanical transmission which is adapted on vehicle high-speed engine

an electrically closed test bench with DC-bus to feedback energy is designed.Different types of transmission test bench are compared and analyzed.The overall structure and remote automatic shift mechanism are also designed.The measurement and control system based on Profibus-DP is set up

the communication between PLC and variable frequency inverter S120 and ProfiⅡin industrial personal computer are realized.The high-speed acquisition of the testing process signals are realized through multifunction data acquisition card PCI-1711.As a result

the bench has good energy efficiency and scalability.