| The amphibious vehicle has the characteristics of both vehicles and ships.It can be used both on land and on the water surface,and has wide application value in military and economic fields.In order to improve the maneuverability of the water,an amphibious vehicle adopts a liftable suspension.Considering the requirements of structural arrangement,the electric drive is selected as the main power transmission mode for onshore driving,in order to meet the quiet function and cruising range of the amphibious vehicle.It is required to propose an extended-range power system for amphibious vehicles,which focuses on selecting the power battery and generator capacity based on the peak power of the amphibious vehicle on the land,and appropriately increasing the engine selection power with reference to the water navigation power,and the amphibious vehicle while driving on the water.The extended program can effectively meet the lightweight design requirements and quiet design requirements of the amphibious vehicle.From the literature that can be consulted,there are few researches on hybrid power systems based on the amphibious vehicles.The research of the thesis has high theoretical significance and engineering application value.The paper proposes an extended-range power system scheme for amphibious vehicles,and completes the matching of power system component parameters,and studies the extended program control strategy,and builds a simulation model based on CRUISE software,and completes the simulation analysis of dynamic performance and cruising range,and builds a prototype of the system.The main work is as follows:Firstly,focused on the characteristics of the amphibious vehicle power demand,based on the comparative analysis of the advantages and disadvantages of the three power system schemes,the extended program power system scheme was selected as the power system of the amphibious vehicle,and the overall system layout scheme of the extended program power system was planned.Secondly,the amphibious vehicle's amphibious conditions and power requirements are analyzed separately.Based on the vehicle design parameters and performance indicators,the quality,performance and life of the power system are considered comprehensively.Under the principle of ensuring global optimality,the engine's power,the ISG's power,and the battery pack are selected to determine the parameters of the key components of the power system.Thirdly,the operation mode of the amphibious vehicle power system in different working conditions is analyzed.The constant power control strategy is adopted as the basic vehicle control strategy.The different control strategy is formulated according to different working conditions,which is realized on the basis of ensuring the dynamics.Long cruising range.Based on the Simulink,the control model of the amphibious vehicle power system was built,which laid the foundation for system simulation.Last,based on the CRUISE vehicle simulation software,the simulation models of the power system are built.The dynamic performance and cruising range of the extended-range system under various working conditions are simulated and analyzed.At the same time,the physical prototype experiment is completed.The simulation results show that the power system can effectively guarantee the climbing performance and full load acceleration performance of the vehicle.The range of extended range and pure electric mode can reach 1257 km and 55.44 km respectively,which meets the design requirements.The physical prototype experiment verifies that the parameters' matching and the control strategy of the power system is basically feasible. |
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