Abstract
Electronic pressure regulator (EPR) is an important part of pressurized lean premixed CNG engine fuel supply system. To improve the precision of CNG engine Air-fuel ratio control, this paper build the physical and mathematical model of the gas state variation and the movable elements of two-stage typical regulator based on fluid mechanics and force analysis. The mathematical model is composed of differential equation of valve plate movement, gas-flow and intracavity continuity equation. The accuracy of simulation and simulation method was verified by comparing the simulation results with the experimental data. Pressure variations in decompression chamber affected by significant parameters of second-stage regulator were studied in detail, such as damping parameters, spring stiffness and mass of valve plate, etc. Combined with further experiments, it is proved that the mechanical structure can ensure the transient performance of the system.
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