Patent ID: 8991940
Filing Date: 2015-03-31
Classification: B60T

Abstract:
1. An electrically driven brake booster comprising: a master cylinder for generating a hydraulic pressure to be used for generating a brake force; a pressing member for controlling a hydraulic pressure generated by said master cylinder; a shaft member configured to be operated with said pressing member by force operating on a brake pedal to push the brake pedal back toward a release side when the pressing member is not operated, the force changing according to movement of said pressing member; an electrically driven actuator for moving said pressing member forward and backward; a sensor to be used for measuring a movement or a position of said shaft member; and a controller; wherein: said controller is configured to control said electrically driven actuator in accordance with an operation of the brake pedal to control a hydraulic pressure to be generated by said master cylinder; and said controller is configured to perform a learning operation to set a movement reference point for said shaft member, the learning operation comprising: