Low impedance injectors have a resistance of about 1 to 2 ohm. Injector is activated, a current of about 0,75 A passes through Have a coil with a resistance of about 15 ohm. Injector coil has a high or low impedance. Needle into the core of the coil, and the fuel is injected. Through the coil, the core is magnetised. Injection systems while top feed injectors are more often used inĮlectrically, the injector consists of a coil. Bottom feed injectors are often used in singlepoint In the case of a bottom feed injector, the petrolĮnters the injector at the bottom, while in a top feed injector, itĮnters from the top. The fuel enters the injector determines whether it is a bottom orĪ top feed injector. Sequential injection systems make it possible toĪdjust the fuel/air ratio and the injection timing for each individualĬylinder to maintain the correct operating condition of the engine. Multipoint systems, is controlled by the fuel pressure regulator.Īre multipoint systems in which the injectors are activated individuallyįor each cylinder. The fuel pressure in the rail, which amounts to 2 to 3 bar in The fuel from the tank is pumped through a fuel filter to the fuel Of collection and distribution pipe for the fuel. The injectors are connected to the fuel rail. The intake manifold, and inject the fuel in the direction of the intake The injector is mounted in the throttle body and injects ![]() Method where the fuel/air mixture is achieved by one centrally placed ByĪdding the fuel to the air sucked in by the engine, a mixture is createdĭepending on the kind of engine management system either one injector per cylinder (multipoint systems) or one injector for all cylinders (singlepoint systems) are used. This would help cut the cost premium between gas and diesel engines.Valves which accurately control the quantity of fuel delivered. An engine optimized for these injectors could potentially meet the Euro VI (and equivalent US Tier 2 Bin 5) standards without the need for any costly NOx aftertreatment. Continental is claiming the new injectors help achieve a 35 percent reduction in particulate and NOx emissions. Because the fuel flow can be measured in real time with the new injectors, the size of individual pulses within the sequence can be varied for even lower fuel consumption and emissions. High pressure common rail injection systems typically use 5 -7 individual injection pulses per combustion cycle. Because the position of the needle in time now correlates so well to the fuel flow rate, the potential exists to be able to eliminate other sensors that are being used to control diesel fuel systems. ![]() The expansion of the piezo crystals is more precise and repeatable than the electro-magnetic solenoids allowing for more precise fuel metering for lower consumption andĬontinental's new injector design takes advantage of the precision and reproducibility of the piezo crystals by adding position sensing to the needle itself. That expansion causes the needle to move. ![]() Piezo injectors use a stack of piezo crystal plates that expand when an electric current is applied. Earlier injectors used electro-magnetic solenoids to move the injector needles allowing fuel to flow into the combustion chamber. Diesel engines as clean and efficient as they are has been common rail injection systems and, more recently, piezo electric injectors.Ĭontinental Automotive Systems has just introduced a new type of piezo injector that may take diesels to the next level.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |