Characteristic Analysis and Data Modeling of Large Hysteresis Nonlinear Hydraulic Viscous Speed Regulating System

The hydraulic viscous clutch (HVC) boasts a compact structure, lightweight, high efficiency, and step-less speed regulation. It is widely adopted in transmission systems for large-scale equipment and special vehicles, especially in the fan-cooled armored vehicle systems. However, accurately determining the characteristics and models of the hydro-viscous drive (HVD) speed regulating system is challenging due to variations in transmission medium temperature and the system’s complex internal structure. This paper focuses on enhancing control performance by elucidating the dead zone, hysteresis, saturation, and band discharge characteristics of the HVD speed regulating system. It proposes a data-driven model for HVD speed regulation. Extensive experiments were conducted to capture regulation characteristics, analyze the formulation of the HVD speed regulation law, and validate the data-driven model’s reliability. The error of the established HVD regulation model in the main loop is less than 10%, showcasing its robust generalization capability. This research not only provides valuable insights into the dead zone, hysteresis, and saturation phenomena of the HVD speed regulating system but also establishes a theoretical framework for optimizing structure, evaluating performance, and achieving precise control of HVC.