ELECTROHYDRAULIC BRAKING SYSTEM WITH A PEDAL TRAVEL SIMULATOR CONSISTING OF A SPRING LOADED PRESSURE CYLINDER AND A MECHANICALLY COUPLED SERVO PISTON

摘要

The invention relates to a return of the brake fluid out of the pedal travel simulator into the auxiliary brake circuit. For this purpose, a pedal travel simulator is designed as a spring-loaded cylinder with a coupled and activated hydraulic booster piston and with a strengthened compression spring. The compression spring conveys the brake fluid contained in the pedal travel simulator back into the auxiliary brake circuit of the electrohydraulic brake system. The spring force of the compression spring is dimensioned such that, when the piston of the pedal travel simulator is in its inlet-side end position, the pedal travel simulator has prevailing in it a minimum pressure which is sufficient to make it possible to adhere in the auxiliary brake circuit to the boundary conditions for the auxiliary brake system which are prescribed according to StVZO, EU directive 71/3210 EWG and ECE regulation 13. When the electrohydraulic brake system is operating normally, the pedal travel/pedal force characteristic of the pedal travel simulator is set via the hydraulic activation of a coupled hydraulic cylinder.