The increased efficiency of conventional internal combustion engines, the growing market penetration of electric powertrains, the requirements for higher safety, and the demand for automated driving have resulted in new requirements for brake systems. With the electromechanical brake booster, iBooster, Bosch meets these requirements without changing the established brake system layout.
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Since the introduction of the Electronic Stability Program (ESP) in 1995, brake system requirements have changed significantly. In addition to high expectations regarding reliability and availability of safety-related brake systems (whilst keeping costs low), there are new demands arising from the introduction of more and more Advanced Driver Assistance Systems (ADAS), as well as more efficient engines, and electric powertrains.
For ADAS, this means both increasing relevance of Noise, Vibration and Harshness (NVH) regarding features such as adaptive cruise control to standstill and the need for substantially higher pressure build dynamics for new safety features. Future CO2 emissions targets have resulted in gasoline engines that no longer have sufficient vacuum for brake boosters in all operating conditions. The vacuum must then be generated either by a mechanical vacuum pump attached to the engine or an electric vacuum pump. Because of the powertrain electrification, the NVH requirements become even stronger, and the vacuum source for brake boosters is removed completely.
Hybrid and electric vehicles have opened up the option to improve fuel economy by converting kinetic energy through regenerative braking of the generator into electrical energy to charge the battery. To produce this in a comfortable manner, the brake system needs to “blend” the braking torque of the generator. The introduction of automated driving requires redundancy within the brake system, in order to guarantee deceleration of the vehicle even in the event of failure.
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