Research On EFI Control Technology Of The Locomotive Internal Combustion Engine

In recent years,with the implementation and implementation of national energy conservation and environmental protection policies,diesel locomotives,as an important power equipment in the railway transportation industry,have put forward higher requirements for their energy saving and emission characteristics.To achieve this goal,the use of EFI control technology for locomotive internal combustion engines has become inevitable,which not only solves the problems of energy saving and environmental protection,but also improves the safety of locomotives.At present,the electronic injection control system products of locomotive internal combustion engines are mainly provided by several foreign companies.China is still in the state of introducing and absorbing the system,and there is an urgent need to establish a development platform for diesel electric injection control systems with independent intellectual property rights.To this end,this dissertation studies the control technology of diesel locomotive diesel electromechanical injection,which is of far-reaching significance for improving China’s domestic research in this field.In this dissertation,by referring to a large number of domestic and foreign literatures,the development status of diesel electromechanical injection control technology is studied in detail,and the application of diesel high-pressure common rail electronic injection control technology to diesel locomotives is proposed.Then,the working principle of selecting diesel engine high-pressure common rail EFI control system is introduced.According to its structure and characteristics,the design scheme of diesel engine high-pressure common rail EFI control system is proposed.The key components of the diesel high-pressure common rail EFI control system are mainly five parts: high-pressure fuel pump,fuel common rail pipe,fuel injector,sensor and electronic control unit.The main working principles and functions of each key component are introduced.Immediately afterwards,a study was made on the control algorithm of the diesel high-pressure common rail EFI.Based on feedforward control and fuzzy PID control,this dissertation designs a feedforward adaptive fuzzy PID control for the locomotive diesel engine.The performance characteristics of the system are analyzed and studied in several aspects such as time and multiple injection control,and a reasonable control strategy is formulated to achieve optimal control of the system.Then based on the technical requirements of the EFI control system,the hardware design of the electronic control system was made,and the NXP car grade microcontroller MC9S12XEP100 was used as the core of the control system for this subject,and the minimum system circuit,input signal processing circuit,power management The circuit,fuel injector drive circuit and communication circuit are designed.Finally,this dissertation established a mathematical model based on the basic working principle of the diesel high-pressure common rail EFI control system and the structuralcharacteristics of the key components of the system.The simulation model was built using Matlab/Simulink simulation design software,and the parameters were set and simulated.According to the results,the effects and functions of the internal structure and parameters of the system on the system performance are analyzed.At the same time,the experimental simulation and analysis of several control algorithms are completed.The phase-feedforward adaptive fuzzy PID control algorithm is obviously superior to the other two algorithms in terms of stability,responsiveness and anti-interference,therefore,the feedforward adaptive fuzzy PID control algorithm is finally determined as the core algorithm of this subject.Finally,the joint simulation of the control model and the system model is used to verify the control strategy.Observe the rationality of the rail pressure,fuel injection quantity,and fuel injection pulse width of the system under different operating conditions under the control algorithm to prove the diesel engine designed in this subject the high-pressure common rail EFI control system has practical application value.