Typical common rail piezo injector.12/7/2023 ![]() ![]() The advantage of multiple injections is a smoother combustion process. It is also possible that this atomizer provides two main injections. Injector back-leakage can also be referred to as injector spill testing or leak-off testing. Pre- and main injection times may also vary as engine operating conditions change. Common rail diesel injector back-leakage testing. The electromagnetically operated atomizer can be operated several times in succession. With solenoid-operated injectors, there is no need to use two springs to take care of the pre- and main injection. At this point, the opening on the underside of the injector is released, allowing fuel to be injected into the combustion chamber at a common rail pressure of up to 1300 bar. The control pin, including the injector needle, is moved upwards. This is facilitated by the fact that there is a conical part on the underside of the control pin. This causes the fuel pressure above the control pin to drop very quickly. The fuel pressure located above the control pin will be discharged through a small opening with the remaining return fuel. When the engine management gives a signal to the injector, the coil is energized and the solenoid operated valve will be pulled upwards. The common rail pressure of up to 1300 to 2000 bar (depending on diesel engine generation) is continuously applied to the inlet pipe of the injector. ![]() In rest position, the atomizer is not controlled. The engine management determines on the basis of the engine speed, throttle position, temperatuur, tax and the engine position when the atomizer should open and close and how long it should stay open. The atomizer is operated by an electromagnet.
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