Study on Nonlinear Heat Exchanger Control System of Heat Conduction Oil of Vessel

In this paper, the differential equation of heat exchanger system is deduced according to the working principle of a vessel's heat conduction oil system. Taking the temperatures of heat conduction oil and heavy oil as the state variables, a multi-input coupled nonlinear heat exchanger model with the opening of the thyristor pressure regulating valve and heavy oil flow regulating solenoid valve as control inputs is established based on the analysis of the characteristics of the heat exchanger model. The model is decomposed into two systems: a single-input second-order linear system and a single-input nonlinear system. The sliding mode variable structure (SMVS) controller is obtained by affine nonlinear transformation of the nonlinear model. The experiments of the proportional-integral-differential (PID) and the SMVS control method based on KINGVIEW software platform are used to test the temperature of heat conduction oil and heavy oil. The results show that the SMVS control has advantages of small overshoot, fast response speed and strong anti-jamming capability.