Redundant braking system without system pressure sensor

Abstract

The invention relates to a hydraulic brake system for motor vehicles comprising a first assembly with a brake pedal-actuated master brake cylinder and a first electrical pressure supply device, and a second assembly comprising a second electrical pressure supply device whose pressure side is connected to a first system area of ​​the second assembly, which is connected via at least one inlet valve to at least one first wheel brake connection and via a circuit isolating valve to a second system area of ​​the second assembly, the second system area comprising at least one inlet valve at a second wheel brake connection and an isolating valve at an inlet connection which forms the connection between the first assembly and the second assembly, wherein an inlet pressure gauge is arranged between the inlet connection and the isolating valve.wherein at least one control unit is provided for controlling the components of the brake system. In order to eliminate the need for additional sensors, the control unit includes an operating concept that, in the event of a fault, implements a brake-by-wire operating mode in which the circuit separator valve and the isolation valve are open and a system pressure in the first system area and / or the second system area is determined via the inlet pressure gauge.

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