![]() ![]() When the fuel is ethanol every injector need to be open longer than normal. Instead they work completely independently to each It isn't any connection between the frequency and the opening time. The opening times alsoĭepend of the engine load, as I said. So if the speed/RPM increases, the frequency do the same. The frequencies of the injectors opening sequence depend of the engine speed. More info about injector's linearity further down the page. It is only at very short opening times as an Manufacturer, but the fuel mass per unit always follow the electrical signal variations by a linear function. The delays (or the lag time) vary depending on the Manufacturers of fuel injector's ensure however that these delays not affect the linearity. Although this time has basically the same duration as the dead time interval but tends to be Start to close, but again, it takes time before the valve closes. When the electrical pulse ends so will the valve Theĭelay is approximately 1 mS and the time it takes to start to move the valve is called dead time or lag time. The reason to this behavior depends on electrical induction in the injector coil and mechanical inertia. Place a little time after the electrical pulse. ![]() In the same way, but let me explain the problem in more detail: A fuel injector effective opening time or interval at which the injector inject fuel, takes Actually, one can consider both the pulse width and the actual opening time Signal characteristics - not the time as a fuel injector's valve is open or closed. The terms ”opening time” and ”closing time” is here (and in related documents from this website) equivalent to the electrical The time the injector is closed is between 50 mS and 100 mS (on idle). The opening time is something between 1 mS to 10 mS depending on the manufacture of Synchronize each cylinder so that every injector sprays the inlet port just when it is open - this requires a sequential system.Įvery injector is pressurized by fuel and the opening time is very short. We now talking about a multi-point system! Then all injectors are open and close at the same time. The action of the gas/fluid mixture step. Turbulence together with a high disintegrate/atomize factor of the fuel, will improve Aįrequent on and off sequence of the injector/injectors cause turbulence. Therefore is the opening time short but the frequency for the - on and off - sequences is high. That also means: All injectors are parallel electronically connected to each other.Ī injector inject a relative large amount of fuel. Only one driver/transistor fire all injectors at the same time. One Channel Multipoint System or ”simultaneous injection” The principle, most cars use to regulate the fuel injectors, is: The principle of electronic fuel injection The principle for a conventional car engine with fuel injection
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