Patent ID: 8718800
Filing Date: 2014-05-06
Classification: G05B

Abstract:
1. An apparatus for changing a mode between an automatic mode and a manual mode in a proportional integral differential (PID) controller, the apparatus comprising: a PID operator configured to generate a driving signal by performing a PID operation selectively in the automatic mode based on an automatic mode change signal or the manual mode based on a manual mode change signal; a manual mode buffer configured to perform high-frequency filtering on the driving signal generated by the PID operator during a predetermined time and to output the filtered driving signal to a load driver when the manual mode change signal is generated and the PID operation is performed in the manual mode; and a speed difference integral calculator configured to calculate a speed difference integral signal included in the driving signal generated by the PID operator and to output the calculated speed difference integral signal to the PID operator when the automatic mode change signal is generated and the PID operation is performed in the automatic mode, wherein the PID operator generates the driving signal based on the calculated speed difference integral signal when the automatic mode change signal is generated.