The high-pressure common-rail fuel injection system starts and finishes fuel injection by the high-speed solenoid valve of the pilot injector, and eliminates anomalous injection caused by pressure fluctuations and the breakdown of pumps caused by high injection pressure during high-speed flow in large quantity. In addition, it achieves stable injection at relatively high injection pressure in different situations. It can also improve diesel combustion and performance, reduce NOx in the exhaust gas emissions and diesel engine noise, and improve cold start performance and exhaust gas emission.
The fuel injection of a common-rail system is performed by the electrical signal of the high-speed solenoid valve. In other words, the high-speed solenoid valve determines the start, finish and quantity of fuel injection.
Therefore, researchers involved in the development of high-pressure common-rail systems in many countries have paid great attention to high-speed solenoid valves.
Ri Tong Hyon, a researcher at the Faculty of Electrical Engineering, has built a mathematical model of the high-speed response solenoid valve for a common-rail injector, investigated the influence of various parameters on the dynamic response of the high-speed response solenoid valve, and determined the optimum parameters.
In other words, he has investigated the effects of the inner and outer diameters of the stator outer core, the number of windings turns, the suction current, the outer diameter, thickness and inclination angle of the armature, the drive voltage, the spring preload, the elastic coefficient and the eddy current on the response characteristics of solenoid valves, and determined the optimum structural parameters and structural design.
As a result, he has managed to accurately calculate the dynamic response characteristics of a high-speed solenoid valve in the mixture of various fields.