Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back On the Application of the Software Sensor Concept to the Problem of Structural Synthesis of an Automated System for Regulating Technological Process Parameters I.V. KOVALEV, V.V. LOSEV, M.V. SARAMUD The paper addresses the problem of improving the accuracy of gas concentration estimation under continuous environmental monitoring of a technological facility. A method is proposed for algorithmizing the computing unit of an automated quality-parameter control system based on the concept of a software sensor and using machine learning methods together with algorithmic extrapolation to compensate model errors. The results of simulation modelling of the computing unit are presented, demonstrating the time evolution of model gas concentration values, discrete measurements of a gas chromatograph, the predicted concentration from the software sensor reflecting systematic error, as well as the output of the automated control system with extrapolation, which confirms the effectiveness of the introduced correction. Keywords: automated control system, software sensor, quality parameters, technological process, environmental monitoring. DOI: 10.25791/pribor.9.2026.1705 Pp. 45-51.