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Control Strategies For Electromechanical Coupling Of Hybrid Powertrain For Application To City Bus

Posted on:2016-01-18Degree:DoctorType:Dissertation
Country:ChinaCandidate:C YangFull Text:PDF
GTID:1222330503454927Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
With the increasing deterioration of the transportation energy and the city environment, and the continuous development of the hybrid technique, the hybrid electric vehicle technology with the better property energy saving and emission reduction, vehicle comfort, and the drivability, have been the key technology which the international automobile industry are racing to develop. The single-shaft parallel hybrid electromechanical system based on the automated mechanical transmission(AMT), which has the characteristics of transferring the large torque and the efficient coupling the multi-modes, has been the core technique of the hybrid powertrain of the new energy city bus. However, when that system deals with the driving conditions of the typical city bus route, the electromechanical coupling control problem with the comprehensive optimization index of fuel economy, vehicle comfort and the drivability, might still need the thorough research.To solve the above problem, the AMT-based single-shaft parallel hybrid powertrain is considered as the research object, the design problems of the electromechanical coupling control strategy for that system are detailed investigated in this dissertation. The research work of this dissertation provides the foundation for developing the electromechanical coupling control method of the hybrid powertrain, which might have the property of high fuel economy operating in all working conditions, and also offer the theorical reference for the design of the control strategies of the hybrid powertrain in the engineering practice. The specific research content and achievement are shown as follows.For the optimal energy distribution problem of the quick charge PHEB running in the fixed driving condition of the city bus route, the correctional dynamic programming(DP)-based energy management stategy is proposed for PHEB. The proposed control strategy utilizes the global optimal torque split between engine and electric motor(EM) obtained by the standard DP algorithm as the premise, while combines with the estimated method of equivalent road slope and the dynamical correction logic of the AMT gear-shifting, corrects the global optimal solution obtained by the standard DP algorithm through the AMT gear-shifting operation under the slope condition, and finally implements the comprehensive optimization of the fuel economy and the road slope drivability for quick charge PHEB under the driving conditions of the city bus route.Considering the frequent vehicle launching and accelerating process in the city bus route, an adaptive economical launching and accelerating mode with its control strategy is proposed for PHEB, which includes four ordered steps: pure electrical driving, clutch engagement and engine start-up, engine active charging, and engine driving with their control strategies. The simulation and actual vehicle test results show that the proposed launching and accelerating mode and its contro methods could reduce the fuel consumption in the vehicle launching and accelerating process, and also improve the vehicle comfort by the coordinated control of clutch during the mode transition process.For the transient mode transition from the electric driving mode to the engine-on driving mode, a robust H? hierarchical control approach is presented for PHEB with single-shaft parallel hybrid powertrain, and the control approach includes the design of the clutch troque command in the upper layer by the robust H? controller, and the robust control for clutch position in the lower layer. Simulation results show that the proposed approach could reduce the mode transition time and satisfy the limitation of the vehicle jerk, moreover, the tracking controller for clutch actuating mechanism system could achieve the desired control objectives.Considering the effect the uncertain driving intention caused by the complicated driving conditions of the city bus route, and the uncertainties in the EM model during the PHEB coupling driving process, a robust control strategy considering the uncertain driving intention is presented for single-shaft parallel hybrid powertrain. The proposed control strategy employs the fuzzy logic inference to quantify the uncertain diriving intention, and utilizes the fast response characteristic of the EM compensate the response deviation caused by the engine, meanwhile design the robust torque tracking controller for EM considering the the EM model parameters or external disturbances. Simulation results show that the proposed control strategy could fulfill the efficient PHEB coupling driving process, and at the same time ensure the tracking control performance of the hybrid powertrain when the uncertainties appear.
Keywords/Search Tags:single-shaft parallel hybrid powertrain, automated mechanical transimission(AMT), energy management strategy, launching and accelerating control, mode transition control, coupling driving control, adaptive control, robust control
PDF Full Text Request
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