Viscosity-temperature control system of marine diesel engine based on sliding mode variable structure control

Abstract

The invention discloses a marine diesel engine viscosity-and-temperature control system based on sliding mode variable structure control. The marine diesel engine viscosity-and-temperature control system comprises a light oil tank capable of being preheated, a heavy oil tank capable of being preheated, an oil mixing tank, a filter, an oil pump, a heater, a viscosity-and-temperature control unit, amain machine, an oil inlet three-way regulating valve and an oil return three-way regulating valve, wherein the viscosity-and-temperature control unit comprises a viscosity transmitter, a temperaturesensor and a controller; the controller is capable of regulating the oil inlet three-way regulating valve, the oil return three-way regulating valve and the heater based on viscosity information uploaded by the viscosity transmitter and the temperature information uploaded by the temperature sensor so as to accurately control the viscosity and the temperature of fuel entering the main machine andensure the atomization and combustion effects of the fuel; the controller controls the viscosity and the temperature of the fuel according to a fuel viscosity-and-temperature control system mathematical model; and the fuel viscosity-and-temperature control system mathematical model is a nonlinear mathematical model established based on a sliding mode variable structure control method. The marinediesel engine viscosity-and-temperature control system is capable of accurately controlling the viscosity and the temperature simultaneously, so that the injection stability of the fuel is guaranteed.

Description

technical field [0001] The invention belongs to the field of marine diesel engines, in particular to a viscosity-temperature control system for marine diesel engines based on sliding mode variable structure control. Background technique [0002] For the sake of economy and applicability, heavy oil will still be used as the main fuel for ship power plants for a long period of time. Although the classification of heavy oil is very complicated, no matter what type of heavy oil, it has a high viscosity at room temperature and is difficult to use. It is conveniently transported in the fuel oil supply pipeline of the ship, and directly spraying into the cylinder will cause the injector nozzle to be clogged and carbonized, and the combustion will be insufficient and black smoke will be emitted. Therefore, it is necessary to heat the heavy oil to a certain temperature to achieve a suitable temperature. Viscosity for atomization and combustion. [0003] At present, the viscosity tem...

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Problems solved by technology

[0002] For the sake of economy and applicability, heavy oil will still be used as the main fuel for ship power plants for a long period of time. Although the classification of heavy oil is very complicated, no matter what type of heavy oil, it has a high viscosity at room temperature and is difficult to It is conveniently transported in the fuel oil supply pipeline of the ship, and directly spraying into the cylinder will cause the nozzle of the injector to be clogged and carbonized, and the combustion will be insufficient, black smoke and other adverse consequences. Therefore, it is necessary to heat the heavy oil to a certain temperature to achieve a suitable temperature. Viscosity for atomization and combustion

[0003] At present, the viscosity temperature control system separates the control of temperature and viscosity, and cannot realize the fixed value control of heavy oil temperature and viscosity at the same time, especially in large inertia systems. jetting stability

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