Patent ID: 11964640
Assignee: CONTINENTAL TEVES AG & CO. OHG
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for operating a brake system having hydraulically actuatable wheel brakes, which comprises an electrically controllable pressure supply device, which is separably connected to the wheel brakes, a master brake cylinder which can be actuated by a brake pedal and which is separably connected to the wheel brakes, and a brake fluid reservoir having a first and a second reservoir chamber which are separated by a first partition wall, wherein the first reservoir chamber is connected to the pressure supply device via a first port for fluid removal, via which the pressure supply device is supplied with pressure medium, and the second reservoir chamber is connected to the master brake cylinder via a second port for fluid removal, via which the master brake cylinder is supplied with pressure medium, wherein a first filling level in the brake fluid reservoir is determined by a first sensor element, and a second filling level in the brake fluid reservoir is determined by a second sensor element, wherein the second sensor element detects the second filling level in a second region, wherein the second region is situated in the second reservoir chamber, the method comprising:
operating the brake system in a first fallback operating mode by separating the pressure supply device from the wheel brakes and connecting the master brake cylinder to the wheel brakes such that brake pressure in the wheel brakes is provided by the master brake cylinder when the determined first filling level in the brake fluid reservoir falls below a first predetermined level (p1); and
operating the brake system in a second fallback operating mode when the determined second filling level in the brake fluid reservoir falls below a second predetermined level (p2), wherein the second level (p2) is lower than the first level (p1).