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The Explanation of Piezo Injectors

Posted on 1/16/2016 10:46:25 AM

In order to improve the persformance,efficiency of diesel and petrol engine,Piezo injectors is used to play its important role.Because it adopts the piezoelectric technology to open and close fuel injectors at extremely high speeds and precision to inject fuel into an internal combustion engine.

Through the squeezing or applying pressure from certain crystal like materials or certain ceramics,the Piezo electricity is generated.If this process is reversed and electricity is applied to these same materials they will expand and return to their original size as soon as the electricity is cut off. The expansion of one crystal is too small to see with the naked eye.

In the other hand,by using the the expansion of the crystals to open the injector,the piezo electricity force piezo injectors work.It is too small to open the injector if there is only one crystal expansion.So several hundred little piezo crystals are placed one above the other covering a length of more than half the injector.After that,they return to their original size as the electric charge stops when the electricity pass through.There are two very small levers to reverse the process and open the injector:expand downwards for crystals and another upward movement.Then a spring closes it as the crystals retract.

Piezo injectors are not used any petrol or diesel engine but electrically controlled direct injection engines such as gasoline direct injection (GDI) or common rail diesel engines.

Comparing to the mechanical injectors,the piezo injectors have the advantages of opening and closing much more faster,and more precision in the injecting of fuel during the four stroke cycle.
No matter what the engine operation condition is,it could control the injection fuel quantity precise.
This is monitored by the ECU to the millisecond. In addition to having the right amount of fuel, the engine receives that fuel at the right time, as determined by the engineers of the engine when they were designing it.



Piezo injectors enable inject fuel into the cylinder several times in one stroke (as many as seven times) which is helpful in a diesel engine where a spark is not used to ignite the fuel.Multiple injections allow a pre, main and post explosion and ensures no fuel is wasted.

In general,Piezo injetors are doing good in effectiveness of common rail systems,expecially in fuel efficiency.Meanwhile it also improve the way the internal combustion engine functions.





Piezo injectors
 




 

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