BRAKE SYSTEM FOR MOTOR VEHICLES

摘要

A brake system for motor vehicles, which can be actuated in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver. In the “brake-by-wire” operating mode the system can be operated in at least one fallback operating mode, with a brake master cylinder, actuated by a brake pedal, having a housing and two pistons, which delimit two pressure chambers, are assigned to brake circuits with wheel brakes, a pressure medium reservoir, one electrically actuable inlet valve per wheel brake for setting wheel-individual brake pressures, a first electrically controllable pressure provision device for loading the wheel brakes with pressure, and a second electrically controllable pressure provision device with at least one vacuum connector and a pressure connector, the vacuum connector is connected to the pressure medium reservoir. The pressure connector is connected to at least one wheel brake without a valve being connected in between.

主权项

1. A brake system for motor vehicles, which brake system can be actuated in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver, and can be operated in at least one fallback operating mode, the system comprising:
a master brake cylinder which can be actuated by way of a brake pedal and which has a housing and two pistons which, in the housing, delimit two pressure chambers which are assigned to brake circuits with wheel brakes, a pressure medium reservoir, an electrically actuable inlet valve for each wheel brake, for the setting of wheel-specific brake pressures, a first electrically controllable pressure provision device for the pressurization of the wheel brakes in the “brake-by-wire” operating mode, a simulation device which, in the “brake-by-wire” operating mode, imparts an acceptable brake pedal feel to the vehicle driver, and a second electrically controllable pressure provision device having at least one suction port and one pressure port, the suction port of which is connected, without a valve being connected in between, to the pressure medium reservoir, wherein the pressure port of the second pressure provision device is connected to at least one wheel brake without a valve being connected in between.