Braking control strategies of modern hybrid and electric vehicles

Abstract

Environmental issues and oil resource depletion have urged government and car manufacturers to reduce production of combustion engine vehicle and at same time give more attention to hybrid and electric vehicle (HEV/EV). Fortunately, we have seen these future cars on the rood, for example, Nissan Leaf, Chevrolet Volt and Toyota Auris hybrid. To attract the buyers, these cars must have better efficient in term of equivalent litter per km. One way to achieve this goal, brake blending is incorporated to replace conventional brake system. This paper aims to investigate and compare the performance of such braking system using road test data. Recovered energy and driver comfort are two main aspect analyzed in aforementioned cars. Based on investigation detailed braking data on many driving conditions, it was found that different manufacturers employ different control strategies and have unique feature, respectively. Also, brake blending could cause driver confusion due to different pedal feeling experienced as in the combustion engine car.

Electric vehicle energy consumption taking into account the route topology

“…Friction brakes are used for the sharpest decelerations. The interaction of recu peration and friction braking occurs under the influence of the control unit and this interaction is different for different types of electric vehicles [3]. The possibility of recuperating braking energy is a good feature of motor vehicles with electric traction, because it allows you to effectively use the resulting conversion of kinetic braking energy into electric energy to increase the mileage of electric vehicles on one battery charge [4,5].…”