The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2001
Filed:
May. 10, 2000
Lothar Zeuner, Steineroth, DE;
Christoph Linden, Vallendar, DE;
Lucas Industries plc, , GB;
Abstract
A pneumatic brake booster (,) has a booster housing (,), the interior of which is subdivided by at least one movable wall (,) into a vacuum chamber (,) and a working chamber (,). Projecting into the booster housing (,) is a control valve (,) which, after a response force acting counter to its operating direction has been overcome, controls a pneumatic pressure difference acting upon the movable wall (,). The control valve (,) is operable both by means of a mechanical input element (,) and, independently thereof, by means of an electromagnetic arrangement (,) comprising a coil (,) and an armature (,), which are displaceable relative to one another along the operating direction. To reduce the response force which has to be overcome by a user, a device for detecting an operation of the control valve (,) effected by means of the mechanical input element (,) is provided which, once such an operation has been detected, during said operation prompts an energizing of the electromagnetic arrangement (,) of an intensity sufficient to reduce the response force of the control valve (,) yet not increase the braking force provided by the brake booster in accordance with the operation.