Simulation Of High-pressure Common-rail Fuel Injection System Based On Simulink

With the increasingly strict emission regulation and fuel economy standards, the advantage of electronically controlled high-pressure common-rail fuel injection system became increasingly prominent, this lead to the related research and application is widely carried on. High-pressure common-rail fuel injection system can achieve high stable injection pressure, independently controlled fuel injection pressure, injection timing, fuel injection quantity and fuel injection rate, which greatly enhance the diesel dynamic performance and fuel economy. Hence, the common-rail fuel injection system is an inevitable trend of diesel engine technology development at present.In this paper, the simulation model of electronic common-rail fuel injection system has been established with MATLAB/Simulink software. The influence of related system operation parameters and structure parameters on system performance have been compared and analyzed which can be reference and guidance to future experiments and practice. This effective method can save a lot of labors, and its expandable simulation program greatly reduce the workload and work period.This paper introduces typical abroad high-pressure common-rail fuel injection system and domestic research status in the first place. According to the system structure and operating principle, its physical model and mathematical model have been established, as well as the simulation model on the Simulink software platform. The common-rail fuel injection system is divided into three subsystem, that is high-pressure oil supply pump, common-rail pipe and injector. After running the ’m’ file contains initial parameters and the simulation program, we can get the simulation results of fuel supply properties, rail pressure and injection performance. Moreover, the injector subsystem contains electromagnetic system and mechanical hydraulic system, this paper discussed the critical parameters of magnetic valve, control piston and needle valve respectively, which can have impact on the injection performance. Overall simulation results include plunger cavity pressure of oil supply pump, fuel supply rate, rail pressure, electromagnetic force, magnetic valve lift, fuel injection rate and so on.Future work would focus on experimental verification of the simulation results which can provide reference to the design and modeling of high-pressure common-rail fuel injection system.