Patent ID: 9399452
Filing Date: 2016-07-26
CPC Classification: B60T

Claim Text:
1. A method for controlling an electrohydraulic braking system for motor vehicles of the type having an antilock braking control function (ABS) and an electrically controllable pressure generating device in the form of a cylinder-piston arrangement having at least one hydraulic pressure chamber, and a piston which can be being displaced by means of an electromechanical actuator, so that a predetermined pressure (P Pre _ Pressure ) can be set in the hydraulic pressure chamber, and having a plurality of hydraulically actuatable wheel brakes, in which each of the wheel brakes are connected by means of an electrically actuatable inlet valve to the hydraulic pressure chamber and by means of an electrically actuatable outlet valve to a pressure medium storage container comprising the steps of in the case of the wheel brakes being subjected to an antilock braking control operation, controlling the cylinder-piston arrangement for setting an individual wheel desired pressure (P wherein the individual wheel desired pressures for each of the wheel brakes is set in such a way that the predetermined pressure (P wherein at least one of the wheel brakes has a desired pressure corresponding to the highest wheel desired pressure and the pressure in the wheel brake having the highest wheel desired pressure is set by fully opening the corresponding inlet valve and fully closing the corresponding outlet valve and by controlling the cylinder-piston arrangement such that the pressure in the wheel brake having the highest wheel desired pressure is exclusively controlled by the cylinder-piston arrangement, wherein the pressure in at least one of the wheel brakes having the reduced wheel desired pressure is set by actuating the corresponding inlet valve and outlet valve to reduce the corresponding pressure; wherein the pressure in the wheel brake having the highest wheel desired pressure is exclusively controlled by the cylinder-piston arrangement by displacing the piston in a first direction to increase the pressure in the wheel brake having the highest wheel desired pressure and displacing the piston in a second direction opposite the first direction to decrease the pressure in the wheel brake having the highest wheel desired pressure; and wherein displacing the piston in the second direction to decrease the pressure occurs with the outlet valve of the wheel brake with the highest wheel desired pressure in the fully closed position, and the cylinder-piston arrangement draws pressure fluid from the wheel brake having the highest wheel desired pressure into the hydraulic pressure chamber.