Gasoline direct injection current waveform

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eric989
OneWave
OneWave
Posts: 35
Joined: Fri Apr 16, 2010 6:53 am
Location: Hongke China

Gasoline direct injection current waveform

Post by eric989 »

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
Hongke Technology,China

KimAndersen
TwoWaves
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Joined: Fri Nov 30, 2012 2:53 pm
Location: Denmark

Re: Gasoline direct injection current waveform

Post by KimAndersen »

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 1464 times
Greeting
Kim

eric989
OneWave
OneWave
Posts: 35
Joined: Fri Apr 16, 2010 6:53 am
Location: Hongke China

Re: Gasoline direct injection current waveform

Post by eric989 »

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.
Eric Chen
Hongke Technology,China

eric989
OneWave
OneWave
Posts: 35
Joined: Fri Apr 16, 2010 6:53 am
Location: Hongke China

Re: Gasoline direct injection current waveform

Post by eric989 »

Hi,

The first waveform is from a Audi 2.0 TFSI, the car with no any problem.
Eric Chen
Hongke Technology,China

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