Patent ID: 6361128
Filing Date: 2002-03-26
Classification: B60T

Abstract:
A method for controlling a hydraulic braking system adapted for use in a motor vehicle, the method comprising the steps of:providing a hydraulic braking system having a pressure source comprising an electric motor and ball screw activated piston in fluid communication with a pressure sensor and a pressure actuated mechanism; providing a normally open, solenoid actuated valve separating the pressure source from the pressure sensor and the pressure actuated mechanism; with the solenoid activated valve open, activating the pressure source by actuating the electric motor and ball screw activated piston to increase pressure to the pressure actuated mechanism; sensing that the pressure has reached a desired level using the pressure sensor; activating and maintaining the solenoid actuated valve closed in response to the pressure reaching the desired level, thereby holding the pressure to the pressure actuated mechanism constant; and with the solenoid actuated valve closed, deactivating the pressure source by activating the electric motor and ball screw activated piston to reduce pressure between the solenoid activated valve and the pressure source.