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Common Rail Piezo Injectors

Posted on 1/15/2016 10:14:10 AM

Function of Piezo injector
The injector is newly designed,together with the introduction of the Piezo technology.
It has become smaller and allows a continuous high pressure with every new injection cycle. The dead-weight inertia of the nozzle needle has shrunk to one quarter of its previous size. Together with a higher pulse rate there are more injections than before, pre-injection and very late post-injections.In the same time,it make the possilbe of pressure varying within a cycle.It means that the injection pressure could not only be higher,but also lower,comparing to magnetic valves.With this technology, in the future, Euro-V threshold values can be upheld by engines with a particle filter and possibly, perhaps post-injection for regeneration.

How the Common Rail Piezo injectors work?
The nozzle needle is affacted by about 200 layers of crystalline material.Up to now the Piezo crystal is known only from the sensor side, e.g., as a knock sensor where a voltage change is achieved through pressure. In this case it's exactly the opposite. Voltage generates movement.It take place very quickly because crystal structures react quickly.To achieve the required dilations, 200 of these crystalline layers and a certain lever ratio are necessary. The effect that the linear expansion corresponds precisely to the voltage laid on, is also upheld in this construction.

In the same time,the first variation of direct drive has already appeared. The Piezo drive is connected with the nozzle needle making it possible to call up data about the position of the nozzle needle. It thus, almost takes over the role of the nozzle motion sensor of former systems. Hereby progress is possible concerning the injection control and perhaps also in the error analysis

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