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:
Nov. 04, 2014
Filed:
Mar. 29, 2011
Lothar Schiel, Hofheim, DE;
Lothar Schiel, Hofheim, DE;
Abstract
A motor vehicle 'brake-by-wire' system having an actuating unit, including a brake master cylinder, actuatable by a brake pedal, has a housing and a piston, arranged displaceably in the housing and, with the housing, delimits a pressure space. The brake master cylinder piston is a stepped piston with two differing size hydraulic active surfaces; a first, small active surface assigned to the pressure space, and a second, large active surface assigned to a filling space. In the 'brake-by-wire' operating mode, the filling space is connected to the travel simulator via a pressure medium line such that, in the “brake-by-wire” operating mode, the first small active surface is effective, and, in the recoil plane after a closing travel has been overcome, the second, large hydraulic active surface is effective and the active surfaces are switched over depending on a hydraulic pressure in the pressure space and on the pedal force, respectively.