| The electric vehicle industry is the important part of the state strategical new prosperous industries; it is of great reality significance to develop the electric vehicle technologies. At present, some technological problems are badly needed to be solved in the field of EV (Electric Vehicle) technology, such as automated manual transmission, brake kinetic energy recuperation, and the control algrithom, control theories, complement techniques related to the ablove problems.Automated manual transimission (AMT) system is based on the traditional manual transmission which varies with the traditional one by mounting the automated mechanism on the clutch and transmission. The automated mechanisms include the automatic select and change gear actuators, a variety of sensors about rotation speed, gear state, throttle position etc. The transmission control unit (TCU) controls the accomplishment of gear change by calculating the proper change gear moment after it analyzed the information about acceleration pedal position, vehicle speed, vehicle acceleration, brake pedal position, motor rotation speed, engine or motor torque etc through controller area network (CAN) bus.As one of the vehicle’s automated transmission solutions, the AMT systems have been used in a variety of vehicles with different specification and type. Due to the lack of the knowledge about the inner law of the transmission process as well as the variety and complexity of the control objects, many technological problems such as change gear laws and the key techniques of gear changing process controlling, brake kinetic energy recuperation and its control, the whole vehicle control etc are remaining not being solved.By adopting the techniques of theoretical analysis, computer simulation, rig tests and road tests, this thesis studies the optimal automatd manual transmission control techniques and the energy recuperation technology while the AMT optimal control comprises the main parts of the thesis. The main researching work is as follows.(1) By the features of the AMT system in electric bus, a3-gear AMT system has been developed. The work done includes the whole driving system layout design, the choosing of the main driving motor, the specification of the transmission ratio, the change gear motor selection, the actuator mechanism design, transmission control unit configuration and the whole communication system establishment. Some AMT system control theories, the influential factors on the gear changing, shift control contents and shift control quality are discussed as well.(2) Incorporated with the features of AMT system, the factors which influences on the control goals during the shift process were analyzed. By the guiding of the fuzzy theory, the control regulations were sdudied while using parameters such as the driving variables and the intents of the driver, the multi-parameter control law about the AMT control was formed which can be used as a guide to control shift process in the AMT system. Due to the complexity of shifting process and the variability of the controlled objects, this thesis tried models the main driving motor used in an EV and the whole vehicle dynamic, after that, the simulation of the change gear autuators and the3-gear shift process were carried out. For the multi-gear AMT system, the shift mechanisms were digital modeled. The linear quadratic optimal contrl methods were employed for the position control of change gear motors and the synchronous process. The auto adaptive methods were employed in the clutch engagement control.(3) Due to the importance of the energy storage system in electric vehicle technology, the battery charge/discharge control was investigated and the battery balancing technique was carried out. Meanwhile, for the magnificient impact of state of charge of the battery on the energy management system, the hybrid pulse power characterization was obtained by tests.(4) By applying the "back and fro" hybrid simulation method while the backforward is the main part, the ADVISOR simulation of energy recuperation process in hybrid electric vehicle were studied under the theories of brake force distribution and the energy recuperation control strategies. The simulation results show that the kinetic energy recuperation rate is16.27%; the fuel rate is6.1L/100km under the NEDC (New Europe Driving Condition) which can help providing some foundation for the energy storage and utility application in the hybrid electric vehicles. The energy comprehensive management strategies in hybrid electric vehicle were analyzed. The simulation of SOC variation and gear change states were carried out by using the dynamic programming theory and model predictive control method respectively, the results show that the gear change state weight has significant influence on the vehicle’s shift process.(5) The test platform of AMT system was built and the rig and road tests were carreed out for the validation of the AMT system. The systematic rig test were put on the developed multi gear AMT system in order to aquire the curves about clutch control, engine synchrozing and shift controlling while AMT shifting. The rig tests validated the feasibility and reliability of the developed AMT system.This thesis is sponsored by the Provincial or Ministerial Universityindustry Cooperation on Guidance Projects (No.2010B090400521). The researching results can provide supports for the development of the state strategical prosperous energy industry. |
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