Hydraulic Control System for a Hydrodynamic Torque Converter Comprising a Controlled Torque Converter Lockup Clutch

摘要

Description of a hydraulic control system ( 1 A) for a hydrodynamic torque converter ( 1 ) with a controlled torque converter lockup clutch ( 2 ) of an automatic transmission for controlling a supply pressure (p_WD_zu) of the torque converter ( 2 ) and a supply pressure (p_WK_zu) of the torque converter lockup clutch ( 2 ). The torque converter lockup clutch ( 2 ) is engaged when the supply pressure (p_WD_zu) of the torque converter ( 1 ) 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 ( 1 ), 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 ( 2 ) is disengaged, the valve slide (WKV_S) of the converter coupling valve (WKV) is acted upon in such a way on an active surface ( 15 ) by the reverse pressure (p_WD_ab) of the torque converter ( 1 ), and when the torque converter lockup clutch ( 2 ) is engaged, is acted upon in such a way on the active surface ( 15 ) by the reverse pressure (p_WK_zu) of the torque converter lockup clutch ( 2 ), that at least either the supply pressure (p_WD_zu) of the torque converter ( 1 ) or the supply pressure (p_WK_zu) of the torque converter lockup clutch ( 2 ) is higher than a predefined pressure level (p_- 0 ) over the entire operational area of the torque converter ( 1 ).