The Study On Automated Mechanical Transmission Actuator And Electronic Control System Of Hybrid Bus

Hybrid technology and electronic control technology have a strong practical significance in improving overall vehicle performance, energy consumption, vehicle comfortability and intelligent control etc. Moreover, the structure of hybrid vehicle powertrain is more complex than conventional ones, so it really requires a high-performance automatic transmission system to meet the working needs. This thesis first studied hybrid bus AMT gearbox, and then designed the AMT shifting execution mechanism system and the control strategy system, last this paper ran the in-loop simulation test. The result of this paper can lay the foundation for subsequent study and development in the future.This paper analyzed the hybrid bus’ s working modes, and introduced AMT’s structure, working theory and gear set etc, then established a three-dimensional model of the mechanical structure of the gearbox. After doing research on controlling the clutch and the shifting process, a general framework of AMT’s control system diagram is established, then the overall control system of AMT is completely designed.According to the characteristics of MT gearbox, this thesis designed actuators and hydraulic systems of chsnging and shifting mechanism, and conducted the shifting principle analysis, design calculations, and then the simulation of hydraulic system based on AMEsim software is completed. Result show that the designed AMT actuator meets the requirements.Based on D2 P electronic control development platform, the shifting control strategy, clutch control strategy and diagnostic system control strategy included in AMT electronic control system are developed with the help of MotoHawk, a vehicle shifting control model with two-parameter and convergence type of fuel economy is established, the clutch engagement control model and system diagnostics control model are built based on the "fast-slow- fast" principle, in this way the AMT control system is completely built.Using SiL simulation tests to validate the control strategy, and the whole control system, sub-models, each component control settings and detailed modeling parameters and external variables subsystem are completed in AMEsim, and then a joint simulation is conducted through the interface module with MotoHawk. In this way the correctness and rationality of AMT control strategy are verified.To further ensure that the development of AMT electronic control system can meet the practical application, this paper performed a controller HiL test. The control strategy developed by MotoTurn are wrote into MCS-ECM 112 controller, using VeriStand to built real-time simulation system, NI cabinet can generate analog test signals, load and fault injection, the controller hardware including control strategy can be imported into the virtual controlled object systems. And then the whole system was tested and verified based on Hil test, and the results show that the controller can meet the actual job’s requirements.This thesis completed a overall design, actuation mechanism design, control model building, software in-the-loop test and hardware in the loop testing based on plug-in hybrid bus AMT system, AMT gearbox’s modification and development work were completed, AMT electronically controlled automatic transmission can meet the system requirements, these works really have certain economic and practical significance.