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In the vast majority of applications with thermal drying processes, dryers are normally controlled using target value specifications and/or predominantly empirical values (operator experience). The retention time, throughput speed, starting moisture content, temperature and product quality are all used as control parameters. Moisture sensors with linear characteristics and low interferences, while still offering high service lives, are required to determine the moisture content. A computer can calculate these measurements in real time and compare them with target values calculated from the mathematical model of the drying process. This requires an exact knowledge of the drying process and suitable software. The controller changes the corresponding control variable by comparing the target and actual values.
Examples from different plants show that savings of between 5 and 10 % can be achieved compared with using traditional empirical controllers.

在廣泛的熱乾燥技術應用上，通常烘乾機是以產品規範設定值或主要以經驗法則(操作人員的經驗)控制。產品停滯時間、進出速度、起始水分含量、溫度及產品品質都當作控制參數。濕度感應器有線性特性及低干擾，且使用壽命長等特點，可以用來決定含水份的程度。電腦輔助系統可將這些烘乾製程參數量測值作即時計算，並與以數學模式計算得來的目標值比較，控制人員可以根據目標值與實際值之差異作相對應的改變。這技術需要對烘乾製程有正確知識與合適的電腦軟體支援。
根據不同工廠案例觀察，以電腦輔助系統控制和傳統經驗法則控制比較，前者可節省5~10%的能源。