Patent ID: 6033035
Filing Date: 2000-03-07
Classification: B60T

Abstract:
A method of operation of an electronically controllable brake actuation system for anti-lock automotive vehicle brake systems, the method providing the steps of:providing a master cylinder having a master cylinder piston and operable by an actuating pedal;providing an electromechanical braking pressure generator;providing an electronic control unit;electrically connecting the electronic control unit to the braking pressure generator for the transmission of control signals thereto;providing a first hydraulic connection between the braking pressure generator and a wheel brake of a vehicle;providing a second hydraulic connection between the braking pressure generator and the master cylinder;providing an electromagnetically operable valve in the second hydraulic connection between the braking pressure generator and the master cylinder;electrically connecting the electronic control unit to the electromagnetically operable valve for the transmission of control signals thereto;displacing the actuating pedal and thereby the master cylinder piston;providing a position sensor operably producing an actuation signal representative of a displacement of at least one of the master cylinder piston and the actuating pedal;providing a simulator chamber interacting with the master cylinder;using the actuation signal to produce an actuation speed signal by taking a derivative with respect to time of the actuation signal;determining a delay period based on the actuation speed; andclosing the electromagnetically operable valve at the end of the delay period.