Hydraulic pressure control device for automatic transmission for vehicle including reverse stage and lock-up clutch control systems

摘要

A hydraulic pressure control device for an automatic transmission for a vehicle, including a first, a second and a third hydraulic pressure control valve, wherein the third hydraulic pressure control valve cooperates with the first hydraulic pressure control valve to control switching over of a certain operation of the automatic transmission such as engagement and disengagement of a torque converter lock-up clutch during forward traveling of the vehicle, and also cooperates with the second hydraulic pressure control valve to selectively prevent setting up of the reverse stage when a manual shift valve is set to the reverse range while the vehicle is traveling forward.