Pressure supply device for a braking system of a vehicle and a method for increasing a brake fluid pressure in at least one partial area of a brake system of a vehicle

摘要

The invention relates to a pressure supply device for a braking system of a vehicle with a pressure accumulator (10), a first valve means (12, 14) for lowering of brake fluid out of the pressure accumulator (10), and at least one pump (18), wherein the pressure supply means includes also a in a stepped volume are arranged to be adjustable differential piston unit (22), which, with a first piston surface (24) a at the at least one pump (18) hydraulically linked first partial volume (26) of the stepped volume is limited, and which with a second piston surface (28) is smaller than the first piston surface (24) a on the pressure accumulator (10) hydraulically linked second partial volume (30) of the stepped volume is limited, wherein the first partial volume (26) in addition, on the first valve means (12, 14) and / or on a second valve means for lowering of brake fluid out of the first partial volume (26) is connected hydraulically. Furthermore, the invention relates to a process for increasing a brake fluid pressure in at least one partial area (16) of a brake system of a vehicle.