INVESTIGATION OF THE HYDRAULIC FLOW CHARACTERISTICS OF A COMMON-RAIL INJECTOR DURING OPERATION PROCESS IN A DIESEL ENGINE
Wenmiao Chen, Yunqiang Li, Yupeng Wang, Zhang Chengguo, Yan Lei, Tao Qiu
Abstract
This paper presents an investigation of the hydraulic flow characteristics of a solenoid injector in a common rail fuel system. We analyze the inner flow characteristics of the entire operational process. Based on this theoretical analysis, we develop a numerical model of a solenoid injector by using commercial MATLAB/Simulink integrated design environments. A test rig is also set up to examine the movement of the injector needle. Results show that two stages occur during the opening process. These two stages of the needle are determined by the effective flow cross section that yields a two-stage performance of the mass flow rate. Furthermore, the injection pressure affects the needle lift but high injection pressure has minimal effects on the needle lift as the pressure reaches a threshold.