question for direct injection current waveform

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question for direct injection current waveform

Postby eric989 » Mon Mar 14, 2016 10:39 am

Hi all,
Can direct injection current waveform tell the time of pintle lifts off its seat? There is no obvious hump point on the current waveform like the injector located on inlet manifold.

The file I downloaded from waveform library. I can tell the injector closed time, Can somebody tell the start open time? Many thanks.
waveform.jpg


Eric
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Re: question for direct injection current waveform

Postby LucaB » Tue Mar 15, 2016 6:41 am

Hi Eric.

From what I've always seen when the control voltages are high, it is difficult to see when the actuator opens

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Re: question for direct injection current waveform

Postby roadserpent » Tue Mar 22, 2016 6:17 am

I may end up being corrected here by a pico master user or tech, but I believe that you may be working with a piezo type injector. If I am correct you should be using a 3rd channel to monitor the injector ground, and from what I have read and understand is that piezo or pizzio injectors work with ceramic discs that warp with voltage being applied in one direction and then when polarity is reversed the discs warp the other way. Thus creating the movement to work a pintle off a seat by means of some mechanical linkage. A pintle hump in a waveform is created when a iron core rod moves through the magnetic field of a coil of wire that has voltage applied to it. A piezo injector does not operate in this manner and will never show you a pintle hump in the waveform. Just my opinion from what I have read.
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Re: question for direct injection current waveform

Postby STC » Wed Mar 23, 2016 6:33 am

GDI Injector.jpg


and that "blip" coincides quite nicely with peak voltage
GDI injector 2.jpg
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Re: question for direct injection current waveform

Postby STC » Wed Mar 23, 2016 9:23 pm

Post in Error
Last edited by STC on Fri Mar 25, 2016 10:30 pm, edited 1 time in total.
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Re: question for direct injection current waveform

Postby busjockey » Fri Mar 25, 2016 6:21 pm

What type of Vehicle is this?
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