초록 ▼

A fluid flow control system for controlling the flow of fluid through a valve is disclosed. The control system controls the flow of fluid through the valve by varying the position of the valve. The control system performs this function in such a manner that the change in position of the valve at all

A fluid flow control system for controlling the flow of fluid through a valve is disclosed. The control system controls the flow of fluid through the valve by varying the position of the valve. The control system performs this function in such a manner that the change in position of the valve at all times remains sufficiently bounded so as to ensure that the actual flow of fluid through the valve is substantially equal to the flow predicted by the static flow equation for the valve.

대표청구항 ▼

A fluid flow control system, comprising: (A) a fluid control valve, the flow of fluid through said valve varying as a function of the position of said valve; (B) valve adjust means for adjusting the position of said control valve as a function of a valve position signal; and (C) control means for ge

A fluid flow control system, comprising: (A) a fluid control valve, the flow of fluid through said valve varying as a function of the position of said valve; (B) valve adjust means for adjusting the position of said control valve as a function of a valve position signal; and (C) control means for generating a new said valve position signal during each of a plurality of sampling intervals N, said control means generating said valve position signal by: (1) computing, during each successive sampling interval N, the rate of flow of fluid through said valve as a function of the position of said valve and in accordance with the static flow equation for said valve; and (2) generating said new valve position signal as a function of the difference between a desired flow and said computed flow and in accordance with a non-linear control transfer function which limits said valve position signal, and therefore limits the change in position of said valve between the present sampling interval N and the following sampling interval N+1, to a value which ensures that the actual flow of fluid through said valve during said following sampling interval N+1 is substantially equal to the flow predicted by said static flow equation.