| Motorcycle has become to one of the most important means of transport since its birth in 130 years ago, especially in the rural areas of developing countries, the economical and applicable motorcycle is deeply loved by the people. Motorcycle consuming fuel has dominated motorcycle market, but with multiple impact of more and more strict environmental protection, shortage of energy and the economy slowing down, the traditional motorcycle industry is in a difficult situation.It is the inevitable trend of the development of the motorcycle that replace nonrenewable fuel by clean energy. Electric motorcycle is one way to get rid of the plight of the motorcycle industry. At present, performance of the pure electric motorcycle has a certain gap compared with the fuel motorcycle, such as short battery service life, high service cost, short driving mileage. Meanwhile, hybrid electric motorcycle and fuel cell motorcycle are not suitable for huge villages and small towns motorcycle market in China becasue of its high price nearly ten thousands.The extended-range electric motorcycle (EREM) installs an extra range-extender (RE) based on electric motorcycle. RE starts when the battery power is insufficient, and greatly increases the electric motorcycle driving mileage. Because there is no direct mechanical connection to the wheels, RE working status is relatively independent on motorcycle operating mode. So it can work in regions of better fuel economy and lower emission via reasonable control strategy. Current EREM and extended-range electric bicycle products mostly do not formulate control strategy of RE, its efficiency needs to be improved. A few of them improve efficiency by simple constant power control strategy, however, affect on battery form RE output power is not taken into account, and battery working condition is unprotected.In order to make full use of advantages of EREM’s structure, improve the fuel economy and emission levels, and protect battery working condition, prolong the service life of the battery, in this paper, power matching and control strategy of the EREM are studied in detail, and the rationality of power matching and correctness of the control strategy are verified. The main research work is as follows:(1)According to the principle of simplifying the structure, selects the type of key components of power system. Then analyze working principle based on seletions, and establishes working mode and energy flow condition of power system according to RE status; According to the selected frame parameters and the design of vehicle performance index, matches the driving motor and battery parameters with the theoretical basis of dynamic equation; According to the first principle of high efficiency, matches RE engine and ISG motor performance parameters. It lays the foundation for the research of control strategy.(2)Selects the status parameters of battery. Formulates the RE switch and start stop control strategy with the decision conditions of battery SOC and battery maximum discharge power under the limit current conditions; Selects the low fuel consumption point of engine, and formulates three engine work points control strategy in extended-range mode and double engine work points control strategy in assisted power mode according to the motorcycle driving status; In order to improve the utilization rate of energy, designs the regenerative braking control strategy according to the size of acceleration.(3)Establishes the EREM complete vehicle model in AVL CRUISE, co-simulates with Matlab/Simulink, separately carrys out EREM dynamic performance simulation, control strategy simulation and economic simulation to verificate the result of power matching and the rationality of control strategy; Contrasts and analyzes the economic simulation results of different types of power motorcycle, to verify the economic advantages that EREM compare to fuel motorcycle and parallel hybrid electric motorcycle.Simulation results show that the power matching is correct and control strategy is reasonable. RE could increase endurance of electric motorcycle effectively. It increases 103km with once full oil; Fuel economy is more ideal. The fuel consumption of extended-range mode and assisted-power mode are separately 1.26L/100km and 1.12L/100km in UDC condition; Battery works in low resistance, high efficiency region of 30%～80% SOC, and get charge and discharge current limiting protection; The economic simulation results of different types of power motorcycle show that EREM’s fuel economy increased by 36.7% and 16% respectively compared to fuel motorcycle and parallel hybrid electric motorcycle. |
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