| 摘要 |
The invention provides improved methods and apparatus for determining characteristics of a process-such as primary and second time constants, dead-time, and gain-by applying a doublet pulse to the process and measuring its response. By way of example, in one aspect of the invention, there is provided a method for generating a signal, tau 1, representing an estimate of a primary time constant of a non-self-regulating process, in accord with the mathematical expression tau 1=( delta m tau a2)/A+ is a factor representing the time-wise integration of the controlled variable during the period when the doublet pulse is being applied delta m is a factor representing an amount by which the manipulated variable is incremented, and tau a represents the time period over which the controlled variable signal changes from its original value by a predetermined amount.
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