Comprehensive Optimization Control Of Multi-Adjustable System Of Diesel Engine

In recent years,in the development of diesel electric control technology,scholars have put forward a variety of control methods and optimization strategies for variable valve,variable supercharging and high pressure common rail systems.However,these researches mainly focus on the independent control of the adjustable system and neglect the interaction between the systems.The interaction of multiple systems is also very important to the overall performance of the diesel engine.To improve the overall performance of the diesel engine,it is necessary to carry out comprehensive optimization control of the diesel engine system.Therefore,the transient coordinated control strategy and steady-state coordinated control strategy are designed for diesel multi-tunable system in this paper,and a semi-physical simulation platform is built to verify the transient coordinated control strategy in the hardware-in-the-loop.In this paper,the medium-speed diesel engine is taken as the research object.Firstly,GT-power engine analysis software is used to conduct the whole machine modeling and simulation calculation,and the experimental data is compared with the simulation data to verify the accuracy of the medium-speed diesel engine model.Secondly,the multi-adjustable control system of medium-speed diesel engine is designed by using relevant simulation software,including governor module,variable booster system control module,high pressure common rail fuel system control module and coordinated control mode enabling module.And the signal interaction between the control system and the controlled object is set up reasonably to realize the coupling with the medium-speed diesel engine model.Then,on the basis of the designed control system,the coordination control strategy is designed respectively for the transient and steady-state conditions,and the effect of the coordination control strategy under the steady state is verified in the simulation environment.In the process of designing steady-state coordinated control strategy,AG-MOPSO algorithm is applied to solve the multi-objective optimization problem of multi-adjustable system,optimize the control parameters,and improve the comprehensive performance of medium-speed diesel engine.Finally,the real-time simulation platform of HIL and the hardware platform were built to carry out the hardware-in-the-loop test of the control strategy,and the data interaction between the controller and the data board was realized through the acquisition of signals,thus verifying the feasibility of the coordinated control strategy under the transient state.The simulation and experimental results show that the error of simulation model data and calculation data of medium-speed diesel engine is small,and it has high accuracy and reliability.Moreover,the steady-state coordinated control strategy is designed to optimize the economy and emission performance of the medium-speed diesel engine,and the simulation experiment verifies that the economy and emission performance are improved after the parameter optimization.In addition,the feasibility of the coordinated control strategy under the transient condition is verified by the hardware-in-the-loop test.It can be seen that the coordinated control strategy under the transient condition reduces the speed fluctuation of the medium-speed diesel engine.