Study On Control Strategy Of Gas Fuel Engine For Generating

As the world's oil and coal resources are constantly exhausted,gas fuels have got more and more attention in the energy industry today.Gas fuel is mainly natural gas,which can be extracted from methane,shale gas,and combustible ice and so many other ways.Due to its abundant reserves and low combustion pollution,natural gas is widely used in the power generation industry.In the field of small-scale power generation equipments,natural gas engines begin to receive more and more attention as equipments to drive power generations,and research on natural gas engines is also underway.The research content of this paper is from the development of multi-point EFI engine and its associated controller developed by the research group and the enterprise,which aims to achieve better performance and economy when the multi-point EFI engine is used in power generation.The research method of this paper is mainly based on V-mode.V-mode can help researchers to improve the research efficiency of control models and algorithms in the early stages of ECU developing,reduce research costs and shorten the research cycle.With the relevant software toolchain,the control algorithm's functionality,logic and feasibility can be tested and verified in closed loop.First of all,based on the demand of power generation control and the working characteristics of natural gas engine,the control requirements of each condition are designed.Then,based on MATLAB/Simulink,the control requirements of each working condition are built into Simulink model and Simulink open loop simulation is carried out.And then,GT-POWER simulation model of natural gas engine is set up according to the actual parameters of the test natural gas engine.Through the joint simulation of Simulink and GT-POWER,the simulation of model in loop and pre-calibration have been done.Finally,with the help of tools such as Simulink,automatic code generation and Open ECU,rapid prototyping technology is used to verify the effectiveness of the speed control strategy designed in this paper.The results of engine bench test show that the steady speed adjusting effect is quite well under the condition of small and medium load and large load as well,and the speed fluctuation can be controlled within 5%.Under dynamic conditions,the response of the engine speed is quickly and the engine speed can be stabilized to the set speed in a short time within 2-3 seconds both in the condition of loading and unloading large torque.