| 摘要 |
PURPOSE:To enable the change-over point of speed control to pressure control and the change-over point of injection pressure to be controlled according to the set values by compensating the lag of operation time of a servomotor. CONSTITUTION:A value P1 obtained when a processing time to changeover from injection speed control to injection pressure control is added to the lag time by an output signal, and a value P2 obtained when the processing time to changeover the injection pressure is added to the lag time of the output signal are set as parameters, which are stored in a data memory 7. Since the value of the parameter P1 means the time of the injection speed control to the changeover of a servomotor 2 due to the changeover instruction to the injection pressure control, the travelling distange of the screw is computed by the lagtime if the injection speed at the speed V is multiplied by this parameter. Therefore, if a changeover instruction is output at the point by this computed range (VXP1) before this changeover point l or at point l'', the lag is compensated and the injection speed control is changed over to the injection pressure control at the set changeover position where the lag is compensated. |
