[Diy_efi] fast-ish 6 channel data logger

[Gianmarco Rizzo BE/EAS]

actually i the problem is to see if the events are really sinchronous. for example, the engine likes to kick back when cranking, and cannot be 100% sure the ECU is sparking exactly at 0 TDC. i suspect the spark timing and perhaps injection duration is somewhat erroneous when cranking due to the variable angular speed of the crankshaft. 

remember, this is more or less a homemade ECU, so some validation of whhat it does is the goal of this.


saluti

gm


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> Sent: Dienstag, 19. April 2005 20:24
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] fast-ish 6 channel data logger
> 
> 
> mmmm,
> 
> you may not need to record so many events at the same time if they
> are synchronous, I understand now you are looking for the 
> instantaneous
> change in rotational acceleration. Id grab a crank angle sensor
> off a nissan rb30 motor - rig it up somehow and look at the 360deg
> pulse channel - even on an analog cro it would tell a lot...
> 
> Mike
> 
> 
> 
> At 02:05 AM 20/04/05, you wrote:
> >digital storage oscilloscope is a good idea, but rather 
> expensive... considering this is a hobby
> >
> >just to be more precise, there seem to be issues with spark 
> synchronization when cranking due to the engine slowing down 
> during compression stroke and accelerating after TDC. the 
> engine is a duke, with a rather poor starter motor. there are 
> 2 phase sensors, one on camshaft for phase and one on crank 
> for synch, but with only 4 teeth in the wheel.
> >
> >i have an analog CRO but its hard to see anything 
> interesting. so i thought a data logger might be the answer 
> to see what happens during several compression strokes and 
> how spark and fueling behave and when occur compared with 
> crank signals
> >
> >i have found a cheap data logger but it is limited to 240 
> samples/second in the cheap form
> >
> >i guess at least 1000 samples/seconds will be necessary to 
> see the injection/spark events
> >
> >
> >regards
> >
> >gm
> >
> >> -----Original Message-----
> >> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org]
> >> Sent: Dienstag, 19. April 2005 19:46
> >> To: diy_efi at diy-efi.org
> >> Subject: Re: [Diy_efi] fast-ish 6 channel data logger
> >> 
> >> 
> >> Bellisimo,
> >> 
> >> u can get a digital storage oscilloscope to get u most
> >> of the way there, as long as you only want to know a few
> >> samples and dont need to keep recording under different
> >> conditions...
> >> 
> >> Many DSO's on market, might need to make up a
> >> basic interface so u dont blow the DSO front end, 
> >> but can usually save output to file for print etc...
> >> 
> >> Regards from
> >> 
> >> 
> >> Mike Massen
> >> Perth, Western Australia
> >> VL Commodore Fuse Rail that wont warp or melt !
> >> http://niche.iinet.net.au
> >> 
> >> At 01:32 AM 20/04/05, you wrote:
> >> 
> >> >Hi all
> >> >
> >> >i am looking into a solution for a problem.
> >> >
> >> >i have a aftermarket EFI, and i would like to monitor 
> >> exactly what happens while cranking the engine, so as to see 
> >> exactly when spark and fueling occur in comparison with phase 
> >> sensor pulses
> >> >
> >> >i have thought that perhaps a fast 6 channel data logger can 
> >> help me there, taking 2 injectors, 2 coils and 2 phase 
> >> sensors data fast enough to reconstruct the few seconds 
> >> during cranking and see when different events occur.
> >> >
> >> >so i wondered if anyone has info on how to build this or 
> >> something available on the market that wont cost more than 
> >> the motorbike i am running the injection on :-)
> >> >
> >> >saluti
> >> >
> >> >gianamrco 
> >> 
> >> 
> >> 
> >> _______________________________________________
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> >> 
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> Regards from
> 
> 
> Mike Massen
> Perth, Western Australia
> VL Commodore Fuse Rail that wont warp or melt !
> http://niche.iinet.net.au
> 
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