Abstract
The PID algorithm constitutes the backbone of process control since more than 100 years. The literature considers hundreds, if not thousands, of its variants, analyzing both theoretical and practical aspects. However, the practice of the process industry is not so rich and is generally limited to its basic formulations, and mostly only PI. This study tries to return to the roots of industrial automation by proposing an extremely simple variant of the PI law, but in a non-linear version. We name it sic!PID: simple intuitive PID controller. The research had two independent sources: scientific and practical. We propose a simple and intuitive formulation, which is analyzed through simulations and practically. The proposed structure is successfully used in several industrial facilities, which easily proves its effectiveness and resilience.
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