Optimum Research On The Great Flow And Fast Response Electromagnetic Valve Used In The Medium Pressure Common Rail System Of Diesel Engine

The electromagnetic valve with great flow and fast response is one of the key actuators in the Medium Pressure Common Rail System of Diesel Engine. This paper details with the design and research on this kind of valve that is used both in the electronically controlled fuel injection system of diesel engine type 200 and the variable valve system of diesel engine type 135.A kind of trial device of the electromagnet was introduced. It was used to measure the static magnetic force, the dynamic characteristics of the armature, the coil current and the acceleration of the armature. Based on this device, experiments were carried out concerning on the influence of the boost voltage, the air gap and the spring to the response of the valve. Experimental results proved the credibility of the trial device, which offered a useful platform to develop the high performance electromagnet.LabVIEW was used to develop the measure and control software for the electromagnet valve. The function and its realization of each software module were introduced. Meanwhile, the driven circuit with high and low voltages in different stages were designed for the electromagnet valve. The way about how to control the high voltage was analyzed. The floating voltage of the source end in MOSFET was coupled by a capacitance whose influence to the circuit was analyzed in detail through the simulation model built by using Protel software. The parameters of the electrical parts were optimized result in increasing the credibility of the circuit.3D electromagnetic fields analysis of the electromagnet was carried out by using ANSYS software. Some factors such as working area, coil turns, core number, armature depth and iron material that influenced the magnetic force were discussed in detail. Experiment results proved the correction of the calculation, by which the electromagnet valve was then developed according to the fuel injection system. The test results of the response and flow capability demonstrated that the valve basically met the design target.