Hands On Diesel Injector Current Scoping
Автокөліктер мен көлік құралдары
This Delphi Series Video includes Senior Trainer Dave Hobbs demonstrating current scoping with diesel injectors. Watch the video to learn more!
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Пікірлер: 4
It's a 'peezo' stack😎
As far as I know current flows from positive to negative, so how it's possible to have current flow opposite without changing power polarity? I definitely missed something at school
@taylorolson6939
Жыл бұрын
PE injector drivers reverse polarity to open and close. you are correct.
@robertrichardson5396
Жыл бұрын
Some drivers may reverse the polarity but not in this example. Electrically the injector behaves like a 4 microfarad capacitor. The current flows in one direction to charge the capacitor then the driver effectively short circuits the capacitor (injector) to close it. The capacitor discharge current is now reverse to that of the charging phase. Look at the scope voltage waveform, it ranges from zero to 120 volts positive, it never goes negative. The high frequency oscillation on the current waveform is probably the result of a damped resonant circuit from the series inductance inside the ECU.