Gasoline direct injection current waveform

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Gasoline direct injection current waveform

Postby eric989 » Sat Feb 02, 2013 10:10 am

Hi all,

Could somebody here tell me how to judge the open time for GDI system injector? There should be a point on current waveform show the injector is starting to open. But I can’t see it on my waveform. I guess the action of GDI is very very fast, so we can't see the point.
2.jpg


And regarding to a waveform built-in PicoScope Automotive software(actuators –injector –VAG PD), the waveform notes in the help file said “At the point of injection the current rises from zero to around 15 amps where there is a brief interruption before continuing to rise to just over 17.5 amps”. I can’t see the 15 amps point on the waveform.

1.jpg
Eric Chen
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Re: Gasoline direct injection current waveform

Postby KimAndersen » Mon Feb 04, 2013 10:54 am

Hi eric989

The first waveform you have taken looks weird - seen from my perspective. What car or GDI system are you working on - do you have a specific problem you are involved with.

I may have found a document that might interest you - it's from STMicroelectronics and describes the use evaluation board L9707 in conjunction with gasoline direct injection.

I wouldn't say anymore - just read the document and you will be little wiser.

GDI_BOARD_L9707.pdf
(941.37 KiB) Downloaded 670 times


Greeting
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Re: Gasoline direct injection current waveform

Postby eric989 » Tue Feb 05, 2013 11:44 am

Hi Kim,

The first waveform is from a Audi. I am not sure the car have a specific problem. My customer sent the waveform to me, and I still contact with him about this.

Many thanks for you document, I am reading it.
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Re: Gasoline direct injection current waveform

Postby eric989 » Thu Feb 21, 2013 9:27 am

Hi,

The first waveform is from a Audi 2.0 TFSI, the car with no any problem.
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