Research On Key Technlogies Of Hybrid Electrical Scooter

With the increased energy crisis and environmental pollution caused by vehicles of fuel, energy saving and pollution-free or low pollution vehicles were developed in every country. Electric scooter, as a new green vehicle came into being, there is a short driving distance, climbing ability, long charging time, and many other difficult issues in the traditional design which with batteries as a single energy carrier. Paper proposed a hybrid energy structure which based on lead-acid battery, super capacitor and oil. Power and drive systems were difficult problems in hybrid electric scooter, from research and testing, results of the following areas were achieved:1) Intelligent management system of lead-acid battery was proposed.Under the theory of lead-acid battery charging and discharging, invented the charge control method of "pre-charge--Quick Change by constant current--constant voltage charge--trickle charge", and energy feedback balance control circuit on flying capacitor. On this basis, intelligent management system of lead-acid battery based on TMS320LF2812 was designed. Experiment results show that this intelligent system not only ensures proper operation of lead-acid battery, and avoid various incidents of the common lead-acid battery management system, which can improve hybrid electric scooter lead-acid battery energy system life and safety.2) Regenerative braking systems based on lead-acid battery and super capacitor were designed. Under complex conditions, regenerative braking system based on battery only has the problem that can not completely absorb the energy from braking, under the characteristics of super capacitor instant high-current charging and discharging and half-bridge converter, regenerative braking System based on composite power system is proposed and designed. Simulation results from MATLAB modeling show that the system can not only improve hybrid electric scooter vehicle braking performance, and successfully solved the problem of low absorbing of braking energy, which can help to extend hybrid electric scooter charge driving range. 3) Control strategy based on fuzzy control of hybrid electric scooter was proposed. To solve the problem of low efficiency of the vehicle, through the study of the threshold logic control strategy, hybrid electric scooter models based on threshold logic control strategy and fuzzy control strategy were carried out and compared, results show that the fuzzy control strategy can be better achieved the demand of optimal torque allocation between engine and motor, reducing the emission of pollutants.4) Halbach permanent magnet synchronous motor and its drive system were designed. To meet with hybrid electric scooter special requirement:high speed, high efficiency, high power density, rapid start and stop, field circuit coupled method was used to design Halbach permanent magnet synchronous motor and its computer aided design program. At the same time, observer of the load on hybrid electric scooter performance was studied, and hybrid electric scooter drive system hardware and software were designed. Experiment results show that Halbach permanent magnet synchronous motor drive system based on vector control can achieve hybrid electric scooter control requirement, has a high value in application.