wide band O2 senso and Bosch questions

[Bernd Felsche]

Daniel tapped away at the keyboard with:

> Bernd  did you used to work there as well ?
> 
> Daniel

At Orbital; many moons ago. On an actual orbital engine.

> ----- Original Message -----
> From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
> To: <diy_efi at diy-efi.org>
> Sent: Friday, August 31, 2001 9:47 AM
> Subject: Re: wide band O2 senso and Bosch questions
> 
> 
> > Greg Hermann tapped away at the keyboard with:
> >
> > > At 2:58 PM 8/30/01, Camden Lindsay wrote:
> > > >I hope this is not looked at as a waste of bandwidth/etc...
> > > >I will say what i've heard, although it isn't mutch
> > > >--I would guess it is a "about to be introduced"-- but i have
> > > >read that some japanese manufacturers are using it in japan
> > > >(isuzu, i think..).. and i have also read that the US's gas
> > > >has too much sulfur in it to make DInjection possible (road
> > > >and track i think-- about 1.5 years ago)
> > > >--Of course, this may all be hogwash

> > > Not a waste of bandwidth at all. I know a fair bit about the
> > > Orbital stuff from Perth. (Air boosted direct injectors.)
> >
> > The air-boosted system has the notional advantage of droplet-shear,
> > resulting in a finer mist to vapourize. The expense and complexity
> > of an air pump is a known disadvantage.
> >
> > It's more likely that Siemens would exploit its relationship with
> > Orbital (Synerject) and move an air-boosted system closer to
> > production, partly because of the compound injector/spark plug
> > allowing engine designers more space for valves in the head.
> >
> > Audi had to go to 4 valves (from 5) on their DI engines. There's an
> > Audi A4 with direct injection just released (or about to be) in
> > Germany. It has 16 valves in the 2-litre engine.
> >
> > > It would appear that Bosch is taking (or is about to take) some
> > > form of direct injection a bit more mainstream.
> >
> > > Was wondering whether they are using air boost, or hydraulic
> > > multiplication, as in Navistar IH and the power stroke
> > > diesels---or something different yet??
> >
> > There's a separate hi-pressure fuel pump.
> >
> > I've snipped some details from VW Press releases. See below
> > signature.
> >
> > The need for low-sulphur fuels is due to the catalytic converter
> > technology; at lean-burn, the NOx storage cat would be contaminated
> > with sulphur; a burn-off of the contamination would require running
> > fuelling at stoich or richer, negating the benefits of lean-burn.
> > The life of the cat is also affected.
> >
> > More details soon...

[snip]

-- 
Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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