Study On Digital Speed Regulating System Of Internal-Combustion Engine

In the production process of some industries,a lot of combustible gases could be generated,such as,oil refining gas,coal production and so on.The emissions of these gases will not only cause environmental pollution but also make hidden danger.Refer to the idea of distributed energy,the full use of these combustible gases for power generation will not only alleviate the current energy shortage problems in China,but also reduce the pollution of the environment to ensure the production safety.Using combustible gases for power generation relies on the generator operated by turbine generator.However,in the actual production process,the emissions and concentration of gases are both so irregular that we could not use these gases directly.To prevent the speeding chaos and unstandard power quality,it is necessary to design the speed control system for gas turbine.In the case of constant changes in the concentration of the gas,the system adjust the valve in accordance with actual speed to make speed still stable within a certain range.Due to large volume of gas turbine,the research object of gas power generation technology is not easy to achieve.Focusing on the design of governor,internal-combustion engine gas turbine can be taken for the experimental object instead of gas turbine with similar structure.In order to achieve gas power technology to generate,it is significant to research speed regulating system for internal-combustion as phased process.This paper describes the process and the current development of the electronic governor,analyzed the working principle and its adjustment regularity of speed after internal-combustion engine was chosen as the experimental object.According to the change of the parameters in the process,the regulation of the internal-combustion engine speed and the mathematical model of internal-combustion engine with actuator can be obtained.Integral-separation fuzzy PID was proposed to accommodate system operation on the basis of demand of control system.Then this paper introduces the principle of incremental integral-separation PID and fuzzy control,as well as the advantages of the system control strategy in the process of internal-combustion engine speed regulation.The controller based on integral-separation fuzzy PID was designed in accordance with the general idea of the system,using MATLAB/Simulink simulation software to observe the effect,simulation results show that the system has strong anti-jamming capability and high accuracy regulation.The research on the digital control system of internal-combustion engine cannot be separated from the appropriate experimental platform,including the construction of the platform,the design of hardware and software.When the design of overall scheme was finished,the 1E34 F two-stroke gasoline engine was selected as the experimental object.On this basis,the experimental platform is designed and processed,by way of machining the experimental platform to stable gasoline engine and production structure.In hardware design,TMS320F28335 was selected as the core chip,using photoelectric sensor and T method for calculating speed combined with the platform,and adjusting throttle control amount of execution by stepper motor.The CCS6.0 environment was prepared for programming,including the main program with the functional modules of the subroutine and interrupt service procedures.Finally,the speed regulation experiment was carried out on the platform of the digital control system of the internal-combustion engine.The stability time and speed fluctuation rate of the gasoline engine during the start-up process and the adjacent speed range are obtained by operating the designed speed control terminal module.The results show that the system has good steady-state characteristics.