![]() ![]() We have the injector body which houses the actuation system which we've just discussed, along with a nozzle which is the part of the injector that locates into the combustion chamber and includes a number of tiny holes through which the fuel is physically sprayed into the cylinder. This leads to some challenges if we're aiming to increase engine performance by virtue of a significant increase in fuel delivery.įortunately there is a work around here as the injector is designed as a two part system. The signals used to drive common rail diesel injectors are far more complex than what we may see for a conventional gasoline port injector, requiring accurate control on the part of the ECU in order to control the current through the injector, through the separate stages of the injector's operation.Īgain this is more of a concern for those tuners dealing with aftermarket standalone ECUs than those reflashing a stock ECU.ĭue to the complex operation of the injectors themselves, coupled with the physical fitment to the engine, swapping to larger injectors from a different engine or even aftermarket injectors is difficult or in some cases impossible. In the OE world, Bosch and Siemens produce piezo injectors while Delphi favour the inductive method.ĭenso have their bases covered, developing both technologies. The original benefit of the piezo injector design was the very fast operation which was up to five times faster than the inductive injectors of the time.Īdvances however in inductive diesel injector technology have meant that both injector types can now provide similar performance and it's difficult to clearly pick a winner. It's this movement that is in turn used to actuate and open the injector to start fuel flowing. The principal of operation is that when voltage is applied to the crystal stack, it expands, albeit only very slightly. Part of the solution to this is the very high voltages and currents used to control the injectors.įor example it's common for peak voltages to exceed 100 volts and peak current to reach in excess of 10 amps.Ī piezo injector on the other hand uses a crystal stack inside the injector which is typically made from quartz. In a common rail diesel injector this presents some challenges however as a result of the incredibly high fuel pressures that the injectors are subject to, and the very fast response required from the injector. ![]() This is more relevant for those of you considering the fitment of a univeral standalone ECU rather than reflashing the factory fitted ECU.Īn inductive injector is similar in operation to a conventional low pressure gasoline port fuel injector, where a magnetic coil inside the injector is responsible for opening and closing the injector to control fuel flow. In particular it's important to know that the way piezo and inductive injectors are controlled by the ECU are very different. The fuel injectors used for common rail diesel engines are generally grouped into two methods of operation, piezo, or piezo electric, and inductive or solenoid.Īs a diesel engine tuner it's not strictly essential to have a deep understanding of the specifics of the injector construction and operation, however it's still useful to understand the basic concepts.
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