Fuel injector is a kind of precision device with very high machining precision, which requires large dynamic flow range, strong anti blocking and anti pollution ability and good atomization performance. The fuel injector receives the fuel injection pulse signal sent by ECU to accurately control the fuel injection quantity.

The spray characteristics of injector include atomization size, oil mist distribution, oil beam direction, range and diffusion cone angle. These characteristics shall meet the requirements of diesel engine combustion system to improve mixture formation and combustion, and obtain high power and thermal efficiency.