Ideal regeneration with electromechanical Brake Booster (eBKV) in Volkswagen e-up! and Porsche 918 Spyder

Abstract

In the recent years alternative drive technologies have been become increasingly important. The price increase of petroleum based fuel in the past few years has given rise to various research and development efforts for energy conservation. However, reduced fuel consumption and therefore operating cost and reduced gaseous emissions including primarily carbon dioxide (hence global warming) are the major driving forces behind considerations of sub systems like electromechanical brake booster (eBKV) [1,2,3]. The future viability of electrical powertrains is greatly dependant on their range and battery storage capacity. Electric vehicles will achieve ranges that are sufficient for everyday use only with efficient batteries, intelligent energy management and especially the recovery of braking energy. When a conventional vehicle applies its brakes, kinetic energy is converted to heat by friction between the brake pads and wheels. This heat is carried away into the environment and the energy is effectively wasted. The total amount of energy lost in this way depends on how often, how hard and for how long the brakes are applied. Hybrid and electric vehicles with regenerative braking system are different in that. They recover kinetic energy via the electric motor and store it as electrical energy. This process is known as regenerative braking. This method makes it possible to increase the range of electric vehicles and reduce the CO2 emission.