New opportunities to improve the fuel supply system with a battery fuel system

Abstract

The article shows the effect of increasing the injection pressure (up to p = 250 MPa) on the dynamics of the development of the fuel jet. An increase in the pressure in the accumulator led to a decrease in the angle of the boundary layer of the jet. A decrease in the oscillations of the boundary layer of the jet about its axis is shown. The greatest variations were recorded at рак = 50 MPa. Then, as the рак increases, the vibrations of the nucleus decrease and become practically imperceptible at 250 MPa. A method for controlling the shape of the differential injection characteristic by an electric pulse, which is applied to an electromagnet of the control valve of the electrohydraulic injector of battery fuel system, is provided. The impulse consists of the preliminary, the main and the following additional one. The duration of the preliminary impulse determines the amplitude of the initial stage of the injection characteristic, and the interval between the preliminary and main pulse is the amplitude between the initial and main stages of the injection characteristic. The interval between the main and additional electric pulses is selected in such a way that the subsequent stage of the injection characteristic begins after the termination of the main, but without an interval between them. By selecting the durations of the control electric pulses and the intervals between them, it is possible to obtain a predetermined shape of the differential injection characteristic from stepped to a characteristic with an inclined leading edge. In nozzles with two groups of holes (correction sprayer), the flow rate of the holes in the sub-head volume and on the locking cone is significantly different and depends on the position of the needle. This creates the prerequisites for correcting the fuel supply through the spray holes and, consequently, along the zones of the combustion chamber, taking into account the mode of operation of the diesel engine.

Keywords

diesel / battery fuel system / injection pressure / control of the shape of the injection characteristic / correction of fuel supply to the combustion chamber zones

References

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RIGHTS & PERMISSIONS

Dunin A.Y., Golubkov L.N., Mal'chuk V.I., Dushkin P.V., Ivanov I.E.