![]() ![]() Channel 1 can operate only a single piezo injector when operated in inverted mode.You must leave Channel 2 disconnected and connect Channel 3 with a shorting jumper between the Inj+ and Inj- terminals. Inductance acts to resist current change through the coil. These advantages are higher injection pressures for increased atomization of fuel, multiple injections per combustion cycle, and more reliable pressure regardless of engine speed. Typical common rail injector solenoids have an inductance of 1 mH or less. The use of common rail has brought about many advantages to the diesel engine. This can also be beneficial during cold weather start-ups. With the use of common rail, there can be multiple injections per combustion cycle. Fuel delivery is based upon demands on the engine, such as the amount of boost, the throttle position, engine temperature, etc. The PCM uses inputs from sensors on the engine to control actuators, which control fuel delivery. These stacks of Piezo crystals, when energized by the PCM, will expand and open the injector’s valve, and its actuation is 4 times faster than a solenoid. Piezo is a type of crystal that is wafer-thin and generally stacked on top of each other. Solenoid-actuated injectors have been around for some time, but have been replaced with Piezo actuation. Injectors can be actuated by a solenoid type of driver or a Piezo electric device. Recently developed piezo-injectors are widely used in common rail direct injection (CRDi) systems to reduce fuel consumption and exhaust gas emissions. The droplet size of the fuel as it is sent through the tip is about 7 times smaller than a human hair. The advantage of multiple injections is a smoother combustion process.The tip of the injector has microscopic holes through which the fuel will be delivered as a very fine mist. It is also possible that this atomizer provides two main injections. Pre- and main injection times may also vary as engine operating conditions change. 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 analyzed CR injection system consists of a rotary pump equipped with a fuel metering valve (FMV) 20, a 20 cm3 rail featuring both a pressure control valve. 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. Electromagnetically actuated injectors are used in common rail diesel engines. ![]()
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