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Modeling of a Closed Loop Hydrostatic Transmission System and Its Control Designed for Automotive Applications

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Advances in Engine Tribology

Part of the book series: Energy, Environment, and Sustainability ((ENENSU))

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Abstract

This control strategy can be quite handful in practical situations where constant rpm is the primary need, especially in case of heavy drilling machines/automobiles being employed in drilling large stone quarry in mines. In such a situation, the drilling needs to be performed at a predetermined speed only and major fluctuations in the speed can lead to undesirable results. To realize the same control strategy in real terms, the physical model of a closed loop HST (Hydrostatic Transmission system) system consisting of a variable displacement pump and a fixed displacement motor has been developed. Conventionally, the rpm of the motor decrease upon loading the pump as load pressure increases. This can severely affect the performance of the overall system as it is assumed that the system works excellently or is designed for certain range of rpm which should be more or less constant. Hence in view of the situation, a feedback control mechanism is applied via means of PID (Proportional, Integral and Derivative) controller which keeps track of the decline in rpm of the motor and through certain control strategy sends a command signal to the pump. Based on the received feedback signal, the inclination of the swash plate of the pump is varied resulting in the increase of the flow rate from the pump which consequently increments the rpm of the motor to match the demand requirements resulting in the constant rpm. Furthermore, an advanced PID controller constructed on the basis of neural network following has the capability of approximating nonlinearities. The devised controller has been found to be quite effective during simulations and has edge in regulating the parameters, better robustness and minimizing nonlinearities, fluctuations and errors. Performance indicators such as correlation coefficient (R), variance and root mean square error (RMSE) are computed for the model under multiple regression analysis.

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Mishra, S.K., Singh, P.K. (2022). Modeling of a Closed Loop Hydrostatic Transmission System and Its Control Designed for Automotive Applications. In: Kumar, V., Agarwal, A.K., Jena, A., Upadhyay, R.K. (eds) Advances in Engine Tribology. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-16-8337-4_11

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