Hydraulic braking system for a vehicle having at least two axles

A hydraulic brake system for a highly automated or autonomous vehicle comprising:

• a first axle with at least two wheel brakes;
• a second axle with at least two wheel brakes;
• a first sub-brake system assigned to the first axle and including
• a first brake circuit, a main system which has a first power supply, and a first evaluation and control unit, and
• a secondary system including a second power supply, which is independent of the first power supply, and a second evaluation and control unit configured to redundantly generate pressure in the first brake circuit,
• wherein the first brake circuit includes
• a first pressure generator which is assigned to the main system,
• a second pressure generator which is assigned to the secondary system and is hydraulically connected in series between a first fluid container and the at least two wheel brakes of the first axle, and
• a first modulation unit configured to hydraulically connect the first and second pressure generators to the at least two wheel brakes of the first axle, and configured to perform individual brake pressure modulation in the at least two wheel brakes of the first axle;
• and
• a second sub-brake system hydraulically separated from the first sub-brake system and assigned to the second axle, the second sub-brake system including
• a second brake circuit, and
• a subsidiary system which has a third power supply and a third evaluation and control unit configured to generate pressure in the second brake circuit, wherein the second brake circuit further comprises
• a third pressure generator which is assigned to the subsidiary system and is arranged between a second fluid container and the at least two wheel brakes of the second axle, and
• a second modulation unit configured to hydraulically connect the third pressure generator to the at least two wheel brakes of the second axle, and configured to perform individual brake pressure modulation in the at least two wheel brakes of the second axle.