Electrically driven brake booster

Patent metadata

Field	Value
Publication number	US-8991940-B2
Application number	US-85623310-A
Country	US
Kind code	B2
Filing date	Aug 13, 2010
Priority date	Sep 30, 2009
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

In an electrically driven brake booster wherein an electrically driven actuator moves a booster piston upon operation of a brake pedal to generate a hydraulic pressure for driving a brake force at the maser cylinder, the electrically driven actuator controls to move the booster piston as the pressing member in order to correctly detect presence/absence of an operation of the booster piston and detect a movement pattern of an input rot and an input piston as the shaft member relative to a movement of the pressing member. In accordance with the movement pattern, presence/absence of an operation of the brake pedal is detected. By confirming that the brake pedal is not operated, by the method described above, a zero point of a stroke sensor for detecting the position of the shaft member and zero points of oil pressure sensors for detecting a hydraulic pressure supplied by the master cylinder are learnt.

First claim

The invention claimed is:

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 acc…

Assignees

• Ueno Kentaro
• Hitachi Automotive Systems Ltd

Inventors

• Ueno Kentaro

Classifications

• B60T13/745 Primary

  Operations & Transport · mapped topic