公开(公告)号：EP0114892A4

公开(公告)日：1985-11-25

申请号：EP83902838

申请日：1983-08-05

申请人： MTS SYSTEM CORP

发明人： DOLLERSCHELL JOHN O

IPC分类号： B30B15/16 ,  G05B7/02 ,  G05B11/18

CPC分类号： B30B15/166 ,  G05B7/02 ,  G05B2219/41309 ,  G05B2219/42123 ,  G05B2219/42126

摘要： A "mode switch" (45) is used for smoothly switching a servovalve controlled device such as an SMC press (10), in particular, from control under one parameter to control by another. The mode switch (45) provides a very smooth transfer of control from displacement control (47) between two relatively movable parts (20, 23) to force control (46) to provide for controlling the force exerted by actuators acting between the two parts (20, 23). The mode switch (45) electronically tracks the signals so that when the switching (64, 65) is made the signals are precisely equal to prevent abrupt changes in the control signals. This smooth transfer is achieved even under active control, that is when both control signals are changing in value.