The signals of the current of the electric motor, the piston position and the pressure in the piston-cylinder unit were essential components in the modeling process. At the core of this precision pressure control was both a highly accurate position and speed regulation of the piston using a three-phase brushless electric motor as well as a very precise modeling of the relationship between braking torque, brake pressure and electric motor torque.
#Ibooster brake generator
System pressure could now be modified independently of pedal actuation, and regulated or controlled with the utmost precision, all taking into account the braking effect of a generator or of the recuperative electric motor of an electric vehicle. On top of that, fully variable pedal characteristics could be achieved. A pedal feel simulator made it possible to completely decouple the driver from the system pressure of the brakes, which then laid the foundation for the first autonomous driving functions such as automatic electric emergency braking (AEB). This was made possible by generating brake pressure through a piston-cylinder system driven by a brushless electric motor and distributing it to several wheel brakes via solenoid valves. IBS1 represented the world premiere of a brake-by-wire system that combined the functions of brake actuation, brake boosting and ABS/ESC, including initial autonomous driving functions ( AEB - Automatic Emergency Braking) as well as featuring recuperative braking with generators – all in one single compact unit.īoth, the compact design of the brake system and the precision of the brake pressure control by an electro-hydraulic system was revolutionary – and unimaginable at the time.
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