New Diesel Fuel Injector 320-0670 2645A733 For CATERPILLAR PERKINS C6.6 ENGINE

Modelling the High-speed Injector for Diesel ICE （part 5）

Following the calculation results, the diagrams were obtained as shown in fig. 3 and fig. 4. The data are compared against the cycle dose value for the same control signal, moreover, it should be considered that the higher the dose, the faster the response.

Following the results of measurements given in the diagrams at fig. 3 and fig. 4, the injector operating speed has observably increased. In this regard, further research will consist in analysing the influence of other factors and optimizing their values in order to obtain the maximum operating speed.

3 Conclusions

Further studies to improve the speed of the injector will be made using the described method. The process efficiency will be assessed by the full short-time opening mode of the Bosch injector and the modernized injector. The modernized injector should provide a smaller cycle dose in the modes of short-time full opening, while it will be possible to reduce the duty ratio between the injections. Based on the simulation results, it can be concluded that the cycle dose should be reduced in the short-time full opening mode, while it will be possible to reduce the duty cycle between injections. In this connection, the research shall be continued with respect to the rest of the factors and optimization of their values to obtain the maximum operating speed.

The most promising for increasing the speed of injectors are the following activities:

1) Coordination of forces acting on the needle in order to reduce the required effort of the electromagnet. This matching allows the use of well-designed low-power high-speed electromagnets and their power devices in high-performance injectors. The peculiarity of this coordination process is its essential dependence on the tightness requirements, since the force of sealing the needle along the saddle is, in fact, the calculated force of the electromagnetic drive and can be significantly reduced. For example, the force of the nozzle solenoid valve control valve can be reduced by an order of magnitude.

2) Elastic coupling of the drive to the needle. This connection allows you to achieve the effect of multiplication, when large needle strokes without the use of mechanical or hydraulic transmission devices are provided by small moves of the electromagnet drive. At the same time, a reduction in the working stroke of a drive of any type ensures an increase in its speed. 3) Application of springs of rod type. Such springs provide the maximum level of material utilization efficiency for the accumulation of deformation energy. Rod springs provide minimum values of moving masses and extend the possibilities of arrangement of injectors.