Real Time Evaluation of the Driver Ability to Recover Energy during Braking, by Observing the Slip Ratio of the Powered Wheels, on an Electric Vehicle

This article is about a new method to evaluate the ability of the pilot to recover energy during the regenerative braking period. In order to optimize the amount of energy recovered from electrical braking, most of the existing literatures present optimal methods which consist in defining the optimal braking torque as a function of vehicle speed. The originality of the present study is to propose a new strategy based on the observation of the powered wheel slip. It has been proved that regenerative braking based on a slip controller was less affected by the majority of the parametric changes [1], including the type of road. This method proposes to evaluate the pilot by observing the slip ratio instead of the applied torque. Thus, the optimal engine torque is reduced when the pilot is on a slippery road. Thereby the pilot evaluation is possible in all road conditions.