| 摘要 |
A method and control apparatus are disclosed for maintaining a measured parameter of an environment in a closed-loop system within a range of the desired level for that parameter, to an accuracy greater than that of the parameter measuring device in the closed-loop system. The control apparatus periodically receives measurement readings of the parameter to be controlled from a sensor, having a fixed measurement accuracy. An adjustable length memory stores a historical value of changes between the periodically obtained parameter measurements that have occurred over a predetermined length of time. The control apparatus and method generates a control signal for regulating a prime mover acting on the environment which affects the measured parameter, by combining the historical value change data stored in the memory with the difference between a current parameter measurement and the desired parameter value. Means for conditioning the historical data in response to weighting factors corresponding to the closed-loop environment are provided.
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