A study of operating characteristics of an electric regulator used for CNG vehicle 2019-01-1285
Electric regulator is considered as one of key components of the fuel system, which relates to fuel distribution as well as the operating performance of the engine. In order to examine the operating characteristics of an electric regulator used for compressed natural gas (CNG) vehicle, a simulation study is conducted using mathematical models combined with Maxwell software. The mathematical models including a mechanical model and an electrical model are built to describe the operation of the electric regulator based on the specifications of an actual electric regulator. In addition, the electric regulator is also modeled and simulated using Maxwell software, in which a 2D symmetric model of the electric regulator is created in Maxwell to save computational cost. The dimension parameters and material properties of the 2D symmetric model are based on the specifications of the actual electric regulator. The purpose of simulating in Maxwell is to find out the optimum electromagnetic force based on the change of structural parameters of the electric regulator such as core and plunger shapes, which contributes to improving the dynamic response of the electric regulator. The optimum electromagnetic force is then used as one of input variables for the mathematical models which are solved by Matlab-Simulink to calculate the dynamic response characteristics of the electric regulator. To provide information for this study, effects of key parameters such as spring stiffness, orifice diameter and inlet gas pressure on the operating characteristics of electric regulator are investigated. The simulation results show that a high performance electric regulator could be easily obtained by optimizing the mentioned key parameters.