Bosch Mono-Jetronic

[Wouter de Waal]

>Land Shark wrote:
>
>>No barometric pressure meter. Definitely no air mass / manifold pressure
>>sensor. Except if they're using the inlet ait temp sensor (looks like a
>>thermistor) but if that's the case they're _really_ good :-)
>
> OK then, you have what BOSCH calls the Alpha-n system .. (I wish I had a
> charachter to represent "alpha" in ISO text!) ..
>
> Alpha is throttle angle
> N is of course, rpm
>
> I am AMAZED that they actually built some cars (street) based on this,
> but SA must have different emissions laws than the US :)

Emission laws? Emission laws? Hmmm. Heard of those. :-)

We still use leaded fuel. And the Uno lambda sensor seems to handle it
without getting polluted / coated / whatever. But that's another story ...

>
> The engine is completely mapped, and ANY change to the engine AT ALL will
> require a remapping ... You'll also notice that the WEATHER has some bad
> effects on the driveability ... as the air density changes, the system can
> NOT really compensate that well ..

Actually, the Uno is remarkably driveable. Handles _really_ well. Never had
any problems at all, except this flat spot that crept in recently.


> Also note the processor (package, pins, xtal speed, numbers on top)!!

But of course :-)

>
> Also, I have seen some DME's that have a VACUUM line running to a 
> nice little baro sensor on the PCB ... 

The Uno has a separate (Marelli?) ignition controller. Four teeth / magnets
on the flywheel, little box with a built in vacuum advance sensor, controls
the spark. But _only_ rpm info going to the FI box from the ignition box.

'nother thing. This system can "limp home" if _everything_ is bust. I.e. all
the sensors can be out (except the rpm info from the ignition) and
apparently you'll still get home.

Sounds like black magic to me :-)

W
--
Wouter de Waal        Phone : +27 21 683 5490
Development Engineer  Fax   : +27 21 683 5435
CCII Systems
Kenilworth, South Africa