A Method to Determine the Velocity Profiles from the Power Consumption of Electric Vehicles

Abstract

Acceleration and deceleration are the most important features in performance assessments concerning car's performance. Whether fuel consumption is good or bad has dominated the performance of cars in recent years, and thus many electric vehicles (EV) with high energy-efficiency have been developed. But problems relating to the running distance per charging, the charging time, and so on of electric vehicles have been preventing them from spreading more generally. Under this circumstance, we will analyze the acceleration and deceleration performances of cars and examine the most suitable method for using energy effectively. As to an EV, deriving the accelerated velocity, a, from a situation when electric input power, P, is given to an EV, driving at a velocity, v, is extremely important in order to find out the acceleration performance of a car. This paper analytically describes the results derived from the relationship between obtained the acceleration, a, and the input or regenerated power, P,. Also, this paper shows that the results obtained from the profile of the predicted velocity, v, based on the input electric-power, P, of accelerating cars, corresponds to the characteristics actually measured. It is pointed out here that the EV is very convenient to perform this analysis, because the value of the eclectic input power can be obtained easily by a current and the voltage to the motor on board. This method demonstrates possibilities for predicting the performance of electric vehicles.