The hydraulic control system of a seven gear - automatic transmission of a vehicle

摘要

The hydraulic control system of a seven gear - automatic transmission of a vehicle, comprising a line pressure expensive section (a) for controlling a hydraulic pressure supplied by a hydraulic pump, in such a way that it is stable, of a start of expensive section (b) to the multiplication of a torque of a torque converter (tc) and for controlling the operation and a damper clutch will, a pressure reducing expensive section (c) for reducing a of the line pressure expensive section (a) supplied by means of a first line pressure reducing valve (12) and for supplying a control pressure of a second reducing valve (14) to proportional expensive solenoid valves (vfs1, vfs2, vfs3, vfs4, vfs5, ss1 and ss2) as the control pressure, a hand switch expensive section (d) for controlling a hydraulic line corresponding to a manual shift and a control section (e) of the first clutch for controlling a forward region of pressure in accordance with a control of a first proportional expensive solenoid valve (vfs1), a control section (f) of the second clutch for the supply of the forward region of pressure to a second clutch (c2) corresponding to a control of a second proportional expensive solenoid valve (vfs2) in the third gear, a control section (g) of the third clutch for the control of the line pressure in accordance with a control of a third proportional expensive solenoid valve (vfs3), a control section (h) of the fourth clutch and the first brake for the supply ..