The study of the automatic speed control of locomotive diesel

The engine speed automatic control system is one of the main systems of a diesel locomotive. The mechanical and hydro-mechanical speed regulators used in domestic diesel engines do not always provide the required quality of control. Therefore, the automatic electronic speed control systems are finding increasing application. The paper describes an electronic system for automatic speed control of a locomotive diesel engine developed by the Des ign and Product ion Enterpr i se LLC «Dizelavtomatika» (Saratov) for a 12 CHN 26/26 diesel. The main elements of this system are the sensors for detecting operating conditions, the electronic control package and the electro-hydraulic actuator acting on the metering rail of a high-pressure fuel pump. Mathematical models of the basic elements of the automatic control system are formulated. The numerical analysis of the control system is carried out and the frequency response is calculated. It is shown that an increase in gain of the proportional component of the PID control law can improve the quality of the process and, therefore, to reduce the overspeed following the load relief and to increase the stability margin of the control system. The results of computational studies were used to improve and refine the automatic control system being developed.

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