The milk pasteurization process is nonlinear in nature, and for this reason, the application of linear control algorithms does not guarantee the obtainment of the required performance in every condition. The problem is here addressed by proposing an adaptive algorithm, which was obtained by starting from an observer-based control approach. The main result is the obtainment of a simple PI-like controller structure, where the control parameters depend on the state of the system and are adapted online. The proposed algorithm was designed and applied on a simulated process, where the temperature dependence of the milk’s physical properties was considered. The control strategy was tested by simulating different situations, particularly when time-varying disturbances entered the system. The use of the adaptive rule reduces the variance generally introduced by the PI or PID controller.

中文翻译：

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巴氏杀菌过程的自适应反馈控制

牛奶巴氏消毒过程本质上是非线性的，因此，线性控制算法的应用并不能保证在每种情况下都能获得所需的性能。在此，通过提出一种自适应算法解决了该问题，该算法是从基于观察者的控制方法开始获得的。主要结果是获得了简单的类似PI的控制器结构，其中控制参数取决于系统的状态并在线进行调整。设计了拟议的算法并将其应用于模拟过程，其中考虑了牛奶物理特性的温度依赖性。通过模拟不同的情况来测试控制策略，特别是当时变干扰进入系统时。