Diesel Injector Fuel Injector 0445110561 Bosch for Deutz

Design and analysis of multi fuel injector (part 6)

When compared with the mechanically controlled injector, exact metering of the injected fuel can be done in the electronically controlled fuel injector by varying the pulse width signal from the ECU. Table 1 provides the calorific values, density, and stoichiometric airfuel ratio requirement of the various fuels.

Based on the fuel density, calorific value, stoichiometric air-fuel ratio requirement, power, and speed of the engine required, the fuel quantity and exact timing of the injection will be done by the ECU and the solenoid coil by varying the duration of the injector opening time and the start of the injection.
2.1.Methodology In order to achieve the above objective, the multi-fuel injector was initially designed by considering the various parameter variations among the different fuels. Then modeling and simulation were done. In the simulation, the injector was subjected to various fuels, including gasoline, CNG, and acetylene, for understanding the dynamic working of the designed multi-fuel injector. The following section explains the design, modeling, and simulation procedure carried out for the realization of the objective.

2.2.Design of fuel injector The various parts of the injector are injector body, spring, coil, spindle, and nozzle are shown in figure 1. The major difference between the gaseous fuel injector and the liquid fuel injector is the working pressure as the liquid fuels are highly viscous in nature than the gaseous fuels. Liquid fuels are to be injected at very high pressure in order to atomize the fuel to form a homogenous combustion mixture for combustion to take place. The present design is done for low viscous fuels for reducing the complication in the design process.