PID CONTROL METHOD AND COOLING DEVICE APPLYING THE CONTROL METHOD

摘要

PURPOSE: To provide a PID control method which can set the priority of the differential control operation of a control system in response to the attribute to which the differential value, i.e., an input signal is optionally defined and also to provide a cooling device which applies the PID control method in regard of the PID control where the proportional control, the integral control and the differential control are carried out together or selectively. ;CONSTITUTION: A cooling device which applies a PID control method consists of a controller O, an expansion valve V, and an evaporator R. The controller O is set at different priority levels of a D operation in accordance with the attribute of the differential value, i.e., the positive or negative value.;COPYRIGHT: (C)1994,JPO&Japio