Digijet - Digifant

[Camden Lindsay]

I also would be interested in these emails!


Camden
>Could you copy me on these emails.  I'm certainly not bored.  I'm 
>especially
>interested in the simpler controllers and the cylinder specific selective
>knock control.
>
>dh
>
>
>
>----- Original Message -----
>From: "Jens Knickmeyer" <knickm at gmx.net>
>To: <diy_efi at diy-efi.org>
>Sent: Thursday, August 23, 2001 12:31 PM
>Subject: RE: Digijet - Digifant
>
>
> > Morton,
> >
> > Digijet was developped by Volkswagen because they needed an ECU which
>could
> > handle lambda control. Development started at the beginning of the 80s
>because at that
> > time it became clear that in Europe the cat. converters were soon to be
>introduced and
> > VW wanted a reliable system which couzld be easily adapted to several
>cars. It is basically a
> > Bosch L-Jetronic, only the ECU was designed by VW because at that times
>Bosch had only
> > analog ECUs and VW wanted to use a digital one. So, all peripheral
>components as
> > fuel pumps, fuel filters, fuel rail, injectors and sensors are L-Jet
>parts. Some people call
> > the Digijet "L2-Jetronic". Digijet handles only fuel injection, there is
>no ignition management
> > (this was done by a seperate ECU called "Dignition"). Digijet has always
>been a MAF system.
> > The Digijet lying next to my keyboard is based on a 8049 controller.
>Firmware is kept in a
> > 4k(!)-EPROM. There is no OBD or any other sophisticated features as for
>example idle revs
> > stabilisation. Digijet is very simple and therefore in Germany a good
>choice for tuning.
> >
> > Digifant was developped by Volkswagen, too. In contrast to Digijet,
>Digifant is a complete
> > motronic system which implements injection an ignition management. The
>system came out
> > in the early '90s (at least in Germany). It was available as a MAF or 
>MAP
>system. The MAP
> > systems were used in the cars which used the Volkswagen "G-Lader", a
>mechanical supercharger
> > (In America, there are even non-supercharged cars equipped with MAP
>Digifants). The MAF
> > systems were used in non-supercharged European cars as the Golf, Passat,
>Corrado.
> > Digifant was re-designed several times. Early ECUs have a 8051 for
>ignition management and
> > a 6909 for injection management. Later, a single 68HC11 was used for 
>both
>tasks, whereas
> > the ECU still contained two boards - an analog and a digital board (the
>'90 Corrado used such
> > an ECU). My '92 Polo-G40 has a Digifant with only one board, and AFAIK,
>this is the last
> > evolution of Digifant.
> >
> > Features of Digifant are:
> > - idle rev. stabilisation using spark timing
> > - OBD which implements the Volkswagen diagnosis protocol based upon
>ISO-9141
> > - MAF or MAP sytems using the same hardware design
> > - cylinder selective knock control (only used with supercharged engines)
> >
> > Coding a Digifant system is possible but takes a lot of time because the
>diagnosis protocol
> > takes approx. 70% of all code, and it is a hard job to identify which
>parts of code belong to
> > OBD and which belong to engine control.
> >
> >
> > If you have specific questions (e.g. concerning the NZ engines and their
>engine control) feel free
> > to ask me via email (that way we don't bore the other 95% of the list
>members which are interested
> > in American/Australian engines).
> >
> > Regards,
> >
> > Jens Knickmeyer
> > 
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> >
> >
>
>
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