Modeling main diesel cooling pump control system in MATLAB Simulink environment

Abstract

The article considers simulating the main diesel cooling pump control system in the MATLAB Simulink envi-ronment. Simulating is performed to demonstrate the operation of the upgraded main diesel cooling system. The need to modernize the pump control system comes from the fact that in the original system there is no possibility of adjusting the speed of electric motor rotation, the coolant temperature is regulated only according to the readings from the temperature sensor at the outlet of the main diesel engine, and adjusting the rotation speed of the electric motor in relation to the operating mode of the main diesel engine is not provided. The upgraded control system consists of four sensors (coolant temperature sensor located at the outlet of the main diesel engine, coolant temperature sensor located at the main diesel inlet, sea water temperature sensor and tachogenerator), a fuzzy logic controller and a frequency converter. The frequency converter changes the magnitude and frequency of the voltage supplied to the electric motor, depending on the magnitude of the signal from the fuzzy logic controller. The value of the signal from the fuzzy logic controller depends on the value of the signals from the temperature sensors and the tachogenerator and is determined in accordance with the algorithm written in Simulink. The new system will make it possible to cool the engine more efficiently, due to taking into account the operating mode of the main diesel engine (rotation speed) and will maintain the recommended temperature difference between the coolant at the inlet and outlet of the main diesel engine.