Energy Efficiency Of Electric Vehicles Research Articles

Research on Maglev Flywheel Energy Storage System for Electric Vehicle

In order to improve the energy efficiency of electric vehicle (EV) power battery, and increase the start-up power of EV, a kind of maglev flywheel battery storage energy system is designed on EV, it is active suspension controlled at five degrees of freedom. The system suspension control principle is expounded, and the radial single freedom transfer function of the maglev flywheel is established combining with a digital PID control algorithm. The frequency spectrum characteristic of the transfer function and the flywheel rotor trajectory curve are simulated, and the 30000 r/min rotation experiment of the maglev flywheel battery prototype is realized. The experiment result shows that the maglev flywheel rotor may high speed and steadily spin, and has good energy storage ability. The maglev flywheel battery storage energy system can assist the EV power battery work, improves the battery charge and discharge properties and prolongs the service life of the motive power battery.

System Design and Simulation on Powertrain of Electric Vehicle

With the issue of environmental pollution and energy crisis worsening day by day, the researches and applications of low-pollution and high energy-efficient electric vehicles have become the research trend in the automotive area nowadays. On the basis of analyzing the requirements of pure electric vehicles’ drive motors and power batteries, this paper makes a reasonable selection of the basic parts’ type of pure electric vehicles’ powertrain and the parameters matched. The matching parameter is proved to be reasonable by simulation.

Effect of driving cycles on energy efficiency of electric vehicles

Based on several typical domestic and foreign driving cycles, the energy usage efficiency of the EVs-XL 2000 type electric vehicle (EV) is analyzed. The energy usage efficiency of EVs and the evaluation index of electromotor efficiency are studied. The concepts of “interval usage percentage of energy efficiency” and “exertion degree of energy efficiency” of electromotor are presented. The effects of driving cycles on the distribution of the running status of electromotor and the efficiency are investigated. The efficiency of electromotor and the trend of average driving force at different driving cycles are discussed. The exertion degree of energy efficiency and the total power train efficiency of the EVs-XL 2000 type electric vehicle at typical driving cycles are analyzed and calculated. The result indicates that the driving cycle engenders a big influence on the exertion degree of electromotor energy efficiency at different driving cycles. Dissimilar driving cycles result in different efficiency distributions of electromotor, the control system as well as the average driving force and driving range are variable.

A GRAND NEW DESIGN OF FUTURE ADVANCED ELECTRIC VEHICLE POWERED BY FUEL CELL, BATTERY, FLYWHEEL AND PHOTOVOLTAIC CELL

This paper discusses how a super energy-efficient vehicle (SEEV) with fuel economy more that 100 km/liter could be possible with present technology. The new environmentally compatible vehicle was designed to mitigate urban warming (heat island), air pollution and CO2 emissions in the urban area. The optimal specifications of the new concept energy-efficient electric vehicle (EV) powered by fuel cell or batter equipped with flywheel and photovoltaic (PV) cell are evaluated and also the results of the running simulations of the proposed vehicle are presented. The proposed SEEV will be very promising in mitigating urban and global warming, and also to conserve fossil fuel consumption.