Electronically slip-controllable power-assisted braking system, in particular for a motor vehicle

An electronically slip-controllable power-assisted braking system for a motor vehicle, comprising:

• an actuation device capable of being impinged upon by muscle force;
• a booster device configured to interact with the actuation device for generation of a circuit pressure in at least one brake circuit connected to the actuation device;
• a pressure modulation device capable of having control applied electronically to it and provided in the brake circuit, for converting the circuit pressure into a brake pressure as a function of slip conditions existing at a wheel of a vehicle equipped with the power-assisted braking system;
• and
• at least one wheel brake connected to the brake circuit, the at least one wheel brake being associated with the wheel of the vehicle and converting the brake pressure into a wheel braking force;
• wherein:
• the booster device is arranged in the brake circuit downstream from the actuation device;
• the booster device includes:
• (a) a cylinder housing that defines an interior space within the cylinder housing;
• and
• (b) a piston unit that is guidable movably within the interior space of the cylinder housing and that divides the interior space into a plurality of booster chambers sealed from each other;
• the plurality of booster chambers includes a first booster chamber that is connected to a discharge side of a pump that is drivable by external power for obtaining from the pump a pressure medium under discharge pressure of the pump;
• and
• at least one of:
• the plurality of booster chambers includes a second booster chamber that is fluidically connected to a suction side of the pump for obtaining from a line in which the pump is arranged pressure medium that is under suction pressure of the pump;
• the plurality of booster chambers includes a third booster chamber (a) that is located beyond a first longitudinal end face of the piston unit so that the first longitudinal end face of the piston unit is a wall of the third booster chamber and (b) that is perpetually fluidically sealed within the cylinder housing from the first booster chamber and from which pressure medium is suppliable from the interior space of the booster device to the at least one wheel brake, with the first booster chamber, when connected to the discharge side of the pump, being entirely formed around, and radially exterior to, a mid-section of the piston unit that is between the first longitudinal end face of the piston unit and a second longitudinal end face of the piston unit, which is opposite the first longitudinal end face;
• the plurality of booster chambers includes at least three chambers that are each perpetually fluidically sealed within the cylinder housing from each of the others of the at least three chambers, the piston device including a piston element that divides the interior space into the at least three chambers and that is movable only in its entirety;
• and
• the pump is arranged in a return line so that pressure medium is returnable, via the pump, from the at least one wheel brake to a pressure medium reservoir for feeding of pressure medium from the at least one wheel brake.