Innovative Design and Coordinated Control of Multi-mode Coupling Drive System with a Speed-up Clutch for Plug-in Hybrid Electric Vehicles

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 a distributed drive system and a centralized drive system and adding a speed-up clutch, a new hybrid electric drive system named multi-mode coupling drive system is designed. The paper introduces the configuration and the drive modes of the system and the structure and control logic of the speed-up clutch, and establishes the mathematical model of the system. Taking dynamic programming algorithm as the optimization tool and New European Driving Cycle as the test cycle, the system parameters are optimized and the output torque of each power unit is dynamically assigned to optimize the energy consumption. The research results show that the dynamics performance requirements of different conditions can be satisfied by the coordinated control. Furthermore, because the operating points of the engine and the motors fall into their respective efficient ranges, the system efficiency can be improved.

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