Re: K Line Problem

Hello

Thanks to everybody. I will try with an OpAmp at first. If this
doesn't work, I will ask you Bullent to give me a hand with filter.
Thanks
Ezequiel

--- In opendiag@yahoogroups.com, "Bülent Özen" <ozenelekt@i...>
wrote:
>
> Hi Ezequiel
>
> if you are sure it is K-line noise . also try following :
>
> 1.) set the receiver trig Level to 1/2 of Vbat.
> 2.) if you can build a software digital filter with a time
constant of 8 uS , then build it
> 3.) if you dont know the digital filter algorithmes put an
up/down counter with a count frequency of >= 1 MHz. you bring your
received signal at the input of direction input . once a signal
comes and stays till a up or down count is reached then it is a
valable signal at the output of the up/down counter. the spikes < 15
uS are also eliminated. your signal is simply a little delayed but
free of spikes. we use this concept in our J1850 VPWM
simulator/tester handling to filter out the spikes and i believe it
works for ISO9141 too.
>
> best regards
>
> Bülent
>
>
>
>
> ----- Original Message -----
> From: acetoel
> To: opendiag@yahoogroups.com
> Sent: Saturday, December 20, 2003 2:52 PM
> Subject: [opendiag] Re: K Line Problem
>
>
> Attachment?
> Sorry, I didn't find any attachment. Could you mind sending it
to my
> e-mail address?
> Thanks
> Ezequiel
>
> --- In opendiag@yahoogroups.com, Vaklin Hristov <vaklin@k...>
wrote:
> > Answer is in attachment ...
> >
> > B/R
> > Vaklin Hristov
> >
> > http://groups.yahoo.com/car-diagnose
> >
> >
> > At 09:27 20.12.2003 'ã.' +0000, you wrote:
> > >Hello
> > >
> > >The Car is a VW GOL Diesel 2000. So it's a new car. The ECU
is a
> > >SaugDiesel - ECU ID:028 906 124 D
> > >
> > >What voltage levels should I use with a comparator for
defening
> > >a "1" and a "0"?
> > >
> > >Thanks to everybody for replying
> > >Ezequiel
> > >
> > >--- In opendiag@yahoogroups.com, Bora Ku <borakus@y...> wrote:
> > >> on what car do you conect your "project" ?
> > >> on older car when RPM is going high, the ECU let go
> > >> the comunication... ECU is too busy doing what it
> > >> does.
> > >> I saw this when VAG1552 is conected.... it lose
> > >> contact at high RPM (but only in old cars)
> > >> regards
> > >>
> > >>
> > >>
> > >> --- acetoel <Nik@i...> wrote:
> > >> > Thanks.
> > >> > This is becuase my program (a Atmel AVR M128
> > >> > microcontroller with
> > >> > Graphic Display) halts when I accelerate the engine.
> > >> > This produces
> > >> > noise and I "see" (I have a monitor led on the K
> > >> > Line, so I see each
> > >> > byte sent and received - very quicky - but it's a
> > >> > nice way of
> > >> > wathcing the communication), that the ECU sends a
> > >> > byte 3 times with
> > >> > a large delay before disconecting. That's why I
> > >> > supposed the problem
> > >> > is noise on the K line. Also, I have tested all the
> > >> > proyect without
> > >> > the engine on, and the communication works
> > >> > perfectly.
> > >> >
> > >> > Another question. Is there any way I can get RPM in
> > >> > a faster way
> > >> > than reading a block of 4 data?
> > >> > Thanks
> > >> > Ezequiel
> > >> >
> > >> > P.D.: If anybody is interesting in sharing info, and
> > >> > schematics,
> > >> > please send me an e-mail.
> > >> >
> > >> > --- In opendiag@yahoogroups.com, "sk_888_uk"
> > >> > <sk@s...> wrote:
> > >> > > Try and a connect a 10nF 50v capacitor between the
> > >> > K-Line
> > >> > > and ground.
> > >> > >
> > >> > > sk
> > >> > >
> > >> > > http://www.skpang.co.uk
> > >> > >
> > >> > >
> > >> > > --- In opendiag@yahoogroups.com, "acetoel"
> > >> > <Nik@i...> wrote:
> > >> > > > Hello
> > >> > > >
> > >> > > > I'm getting some noise from the motor, into the
> > >> > K Line. So my
> > >> > > > program halts at any time. Specially when I
> > >> > acellerate (this
> > >> > > > generates more noise). How can I filter the K
> > >> > Line?
> > >> > > >
> > >> > > > Thanks
> > >> > > > Ezequiel
> > >> >
> > >> >
> > >>
> > >>
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Received on Sat Dec 20 13:15:53 2003