| The plug-in hybrid electric vehicle(PHEV),as the new energy automobile vehicle,can effectively alleviate the problem of fuel and emission in the process of vehicle driving.On the market of plug-in hybrid vehicles mostly equipped with the centralized drive system or the distributed drive system.For The centralized drive system,in order to meet the dynamic performance of the vehicle,a higher characteristics requirements of the motor is necessary,and due to the difficulty to send exactly the right amount of torque to each wheel,auxiliary device must be added to implement the anti-slip-regulation traction and stability control.The distributed drive system can control the dynamic stability of the whole vehicle by adjusting the torque of each driving wheel independently,but there is a lack of torque self balancing mechanism between the coaxial driving wheels.When one side drives the system,the vehicle is prone to instability.Besides,the high efficiency speed of motors is much higher than that of engine,which cause the operating points of the engine and the motors in the multi-mode coupling drive system not fall in their respective efficient ranges.So,the energy saving potential of the system is not fully realized.To solve the problems that current plug-in hybrid systems lack dynamics control ability and the efficient work areas of the engine and the motors do not match,by coupling distributed drive and centralized drive and adding a speed-up clutch,a new hybrid system named multi-mode coupling drive system is designed.With the object of this paper being a plug-in hybrid electric vehicle installed a new multi-mode coupling drive system,the paper introduces the configuration and the drive modes of the system and the structure and control logic of the speed-up clutch.Taking dynamic programming algorithm as optimization tool,the system parameters are optimized and the output torque of each power unit is dynamically assigned to optimize the energy consumption.Compared with Honda hybrid drive system,that the multi-mode coupling drive system can ensure the vehicle power,as well as,improve the economy of vehicle is proved.In order to improve the fuel economy and feasibility further,a fuzzy inference controller is used to identify the driver intention under different driving conditions This paper includes the following aspects:(1)The configuration and the drive modes of the system of the multi-mode coupling drive system are introduced.Compared with Honda intelligent multi-mode drive system,the superiority of the new drive system is analyzed theoretically.(2)Establishing the mathematical model of dynamics and powertrain,Taking dynamic programming algorithm as optimization tool,the system parameters are optimized and the output torque of each power unit is dynamically assigned to optimize the energy consumption.Compared with Honda hybrid drive system,the power and the economy of vehicle is proved.(3)Mechanical structure,working principle and control logic of the speed-up clutch are analyzed.The design of each gear,transmission shaft and internal parts of the increasing clutch is carried out.The specific structure and size were determined,the strength check of the powertrain component is carried out,and finite element analysis is completed.(4)The energy management strategy based on the driver intention recognition using the fuzzy inference model is proposed.The New Europe Driving Cycle(NEDC)and actual driving cycle are taken as the simulated cycle to carry out the simulation analysis of vehicle economy. |
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