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. 02, 2010
Filed:
Mar. 16, 2006
Georg Gierer, Kressbronn, DE;
Thilo Schmidt, Meckenbeuren, DE;
Tobias Rolser, Berg, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
Description of a hydraulic control system (A) for a hydrodynamic torque converter () with a controlled torque converter lockup clutch () of an automatic transmission for controlling a supply pressure (p_WD_zu) of the torque converter () and a supply pressure (p_WK_zu) of the torque converter lockup clutch (). The torque converter lockup clutch () is engaged when the supply pressure (p_WD_zu) of the torque converter () is lower than a predefined pressure level of the supply pressure (p_WK_zu) of the torque converter lockup clutch. A converter pressure valve (WDV) is provided for controlling the supply pressure (p_WD_zu) of the torque converter (), and a converter coupling valve (WKV) for controlling the supply pressure (p_WK_zu) of the torque converter lockup clutch, where their valve slides (WDV_S, WKV_S) can be acted upon by at least one pre-control pressure (p_VS) and one system pressure (p_sys). When the torque converter lockup clutch () is disengaged, the valve slide (WKV_S) of the converter coupling valve (WKV) is acted upon in such a way on an active surface () by the reverse pressure (p_WD_ab) of the torque converter (), and when the torque converter lockup clutch () is engaged, is acted upon in such a way on the active surface () by the reverse pressure (p_WK_zu) of the torque converter lockup clutch (), that at least either the supply pressure (p_WD_zu) of the torque converter () or the supply pressure (p_WK_zu) of the torque converter lockup clutch () is higher than a predefined pressure level (p) over the entire operational area of the torque converter ().