The Simulating Calculation And Structural Design On A Duel-fuel (LPG/diesel) Injector With Mechanically-control And Monomer

A duel-fuel (LPG/Diesel) injector with mechanically-control and monomer is presented. On basis of HYDSIM software, the calculating model for this duel-fuel injector has been built for simulating the duel-fuel injection;and by means of the Pro/E software, the initial design on the duel-fuel injector has been conducted.In this injector, LPG fuel, which is injected into the cylinders directly, can be ignited by very little diesel fuel;and the pressure of LPG fuel is highly increased by using a boost pump inside the injector;and a four-way valve with a special design is introduced to control the timing of the two fuels;and the exterior outline of the duel-fuel injector keeps the same as that of the prototype, and the interior structures mainly include duel-needle valves with the duel-fuel pipes and the boost pump for LPG fuel, and the four-way valve. A patent has been licensed for the duel-fuel injector in China.The calculating model can simulate the structures and the working process of the injector. New sub-models for the four-way valve and the boost pump have been created by combined models. The initial parameters for the calculating analysis were determined at a rough estimate. The model has also been tested, modified and improved.The simulating analysis has shown that the design for the duel-fuel injector is reasonable and can performed the duel-fuel injection as well;and structural design of the injector has been further improved by means of the simulation;and the dimensions of the all important structures have been determined by analyzing the effects of many factors on the duel-fuel injection;and the results of calculation have verified the reasonability and validity.The Pro/E software was used for the initial structural design on the duel-fuel injector. By means of simulating calculations, the correction of injector has been carried out and many important dimensions were obtained. 3D models of all the parts and 3D assemblies have been built. Engineering drawings of all the parts and engineering assemblies have been performed.