Abstract
A tunable feedback control algorithm is developed for a first-order plus dead time process which has a variable sample interval and a variable dead time. This variable sample interval, variable dead time (VSIVDT) controller is applied to controlling the product composition of a blender using off-line composition analysis. The blender and controllers are simulated using the IBM Real-Time Process Management System/Advanced Control System (RTPMS/ACS). The VSIVDT controller performed better than an alternative controller based on the Dahlin algorithm which uses off-line analysis. When compared to controllers using on-line analysis, it performed as well as a PI controller but not as well as a controller using the Dahlin algorithm.
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