发明授权
US07635057B2 Device for the control at least of a hydraulically operable switching element of an automatic transmission 有权
用于至少控制自动变速器的液压可操作的开关元件的装置

Device for the control at least of a hydraulically operable switching element of an automatic transmission
摘要:
A device for controlling a hydraulically operable switching element (2) of an automatic transmission of a vehicle with a position valve mechanism (3) having a main switch piston (6) which is spring biased into a first switch position and a second switch position with a pilot pressure (P_MV) which is adjustable through an electrically operated actuator (5). An additional switch piston (7) and the main switch piston (6) are axially actuated in a valve housing (8). Depending on the position of the pistons (6, 7), faces (6A, 7A) of the respective pistons are either spaced apart or adjacent. The additional switch piston (7) is adjustable depending on a pilot pressure (p_K) of a switching element which engages a gear for forward drive.
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