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:
Jun. 07, 2022
Filed:
Dec. 17, 2018
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Markus Herrmann, Scheidegg, DE;
Thilo Schmidt, Meckenbeuren, DE;
Alexander Haberstock, Ravensburg, DE;
Adriano Handrich, Friedrichshafen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A valve system for a hydraulic emergency driving gear function of a hydraulic control unit for a motor vehicle automatic transmission includes a position valve () with a first piston slide () and an electromagnetic pressure regulator () having a decreasing characteristic curve. The first piston slide () is preloaded in a first position. When the first piston slide () is in a second position, the electromagnetic pressure regulator () is configured for connecting a system pressure-carrying line () of the motor vehicle automatic transmission to a first emergency driving gear clutch () of the motor vehicle automatic transmission and to a second emergency driving gear clutch () of the motor vehicle automatic transmission, whereby the first emergency driving gear clutch () and the second emergency driving gear clutch () are actuated, so that an emergency driving gear of the motor vehicle automatic transmission is engaged.