Electronically controllable brake booster

US6185498A · kind A · utility

Assignee

• Lucas Industries public limited company · GB

Inventors

• Christoph Linden · Vallendar, DE
• Gregor Godlewsky · Bendorf, DE
• Lorenz Maack · Eppelheim, DE

Key dates

• Filing date: Mar 31, 2000
• Grant date: Feb 6, 2001
• Expiry date: Mar 31, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/4854
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An electronically controllable brake booster with a vacuum chamber and a pressure chamber, which are separated from each other by a movable wall, a control valve arrangement which can be actuated by an electromagnetic actuation device, through which a pressure difference between the pressure chamber and the vacuum chamber can be adjusted, with the control valve arrangement, as a function of a current flowing through the electromagnetic actuation device, assuming a holding position in which the current ranges between a higher value and a lower value without the control valve arrangement leaving the holding position, a first pressure changing position in which the current is higher than the higher value, and a second pressure changing position in which the current is lower than the low value, characterised in that upon a changeover of the control valve arrangement from the holding position into the first or the second pressure changing position, or upon a changeover from the first or the second pressure changing position into the holding position, the current value is sensed at which the respective changeover actually takes place, and this sensed current value is utilised for the spe…