The electromagnetic injector in an injection engine (gas)


The injector is to inject fuel in a state sprayed with fine uniform droplets in the combustion chamber. Engine with direct injection requires a more uniform distribution of the fuel jet, due to a lack of turbulence of the air in the combustion chamber. In contrast, the indirect-injection engine, the fuel spray is required to be in the form of a conical spray, corresponding to the shape of the auxiliary combustion chamber, and a lower fineness of the droplets due to the existence of turbulence.

Construction injector electromagnetic gasoline depends mainly on the location of (the gate valve, one for each cylinder, or further down the shutter when using an injector for all cylinders), which determine the fact and the pressure injection limited avoiding the formation of plugs provided lower vapor gasoline injector and connecting pipes of the fuel pump.


Injection petrol injection engine is produced by lifting the needle on premises or practiced in the spray nozzle at the time when the bobbin is traversed by a current. At the time armature is attracted towards the center of the coil electromagnetic force, formed to stop the extension buff stud which is inserted gasoline.


The body of the injector is fixed by crimping to the upper part of the nozzle and the lower nozzle. The needle is provided at the top with a profiled portion forming a conical fuel spray wire and the cylindrical guiding zone in the nozzle. It is screw the armature and is axially perforated by a headrace channel to allow petrol in the area around the seal seat. Race one very small needle of only 0.10 mm, is imposed by lifting relatively high frequency corresponding to the maximum speed, as well as to the opening durations very low (about 12 ms at full load and operating temperature of the engine).

Electromagnetic force increases with the square of the race reinforcement, so its reduction leads to fewer ampere-turns (gauge injector and reducing consumption of power). An improvement of this type of injector is to reduce the volume of gas retained inside the injector (which is at risk of expansion and therefore reduce the density of gasoline).


The figure below shows the construction of such type of injector for injection engine, fuel is introduced to the side and washes winding the bobbin that cools. The injector is serially connected to other injectors (two main ports, one input and one output of gasoline under the pressure of work).


Regarding the form of jet fuel, diversity of solutions adopted must be selected. The figure below shows four variants of spray nozzles, variant a) obtaining the specific tapered blade drops of gasoline injector needle and nozzle construction with those presented in previous figures.


By interposing a diaphragm denoted in wherein a hole is obtained a single cylindrical jet, and that a diaphragm-screen is used, there is obtained a plurality of fine jets.


It is a solution for quality improvement provided by the gasoline injector spray jet fuel by combining with an air jet at nearly the speed of sound, picking a route the air shutter located upstream. Cylinder injector behaves one that coats the outside of the spray nozzle connected through a pipe 2 air at the speed of sound, is actually spray a jet of air-gasoline, air that is not controlled shutter.

Given the working conditions of low-pressure injectors for engine with injection materials they run their components are conventional steels. Valves and their seats are subject to heat treatment and machining of finesse.


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