Question

A battery electric vehicle requires 120 Wh to accelerate to 100 kph including 20 Wh of energy required to overcome road loads and driveline loss. This EV uses an electric motor that is 92% efficient a). If the vehicle is then decelerated from 100 kph to a full stop using regenerative braking only (i.e. coast down) with the motor of 90% efficient acting as a generator, how much energy would be recovered in theory? b). If the vehicle decelerates from 100 kph to a full stop using blending torque regenerative brake with the motor of 90% efficient acting as a generator. Assuming the regenerative brake calibration has 45% efficiency, how much energy would be recovered in theory?

Answer 1