Patent ID: 8036780
Filing Date: 2011-10-11
Classification: G05D,Y10T

Abstract:
1. A flow controller comprising: flow rate detection means for detecting a flow rate of a fluid passing through a fluid path; a flow control valve mechanism, provided in said fluid path, for controlling said flow rate by regulating valve opening in accordance with valve drive control information; and control means for receiving at least one type of a flow rate set value from an external system and delivering said valve drive control information to said flow control valve mechanism to control said valve opening so as to adjust said flow rate through the fluid path to said received flow rate set value, wherein when said fluid is allowed to flow through said fluid path in advance to deliver said valve drive control information serving as a reference to said flow control valve mechanism, information indicative of a relationship between said reference valve drive control information and a detected flow rate value serving as a reference and detected by said flow rate detection means is associated with a detected pressure value of said fluid and stored as valve property information in storage means of said control means, and wherein when said control means is receiving a new flow rate set value (R test information sampling means for allowing test sampling information to be associated with said flow rate set value (R valve control information gradient computation means for sequentially determining, in relation to a predetermined number of pieces of said test sampling information associated with said flow rate set value (R flow rate test means for determining a valve control difference as test information on flow control after executing said valve control information gradient computation means, the valve control difference being a difference between new valve drive control information (V