air-assisted injectors, sort of

[jb24 at chrysler.com]

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Actually, for all intents and purposes the mixtures at the extreme A/F
ratios aren't mixtures at all.  The direct injection allows stratified
charging, actually close to stoich at the spark plug - pure air in the rest
of the cylinder.  The low load conditions where DI is most advantageous
actually inject after BDC on compression stroke (4- and 2-stroke) to avoid
mixing.  The heat rejection with highly lean mixtures at low load increases
efficiency to get fuel economy up.

John Bucknell


                                                                  
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Please respond to diy_efi at efi332.eng.ohio-state.edu

To:   diy_efi at efi332.eng.ohio-state.edu
cc:
Subject:  Re: air-assisted injectors, sort of





> Ignoring the issue of detonation, how ignitable are lean mixtures? Or
> rather, how lean can you make the mixture and still be able to ignite
> it? What if you allow for a seriously powerful ignition, and/or bump
> the CR up a lot? It seems a bit weird to me that lean mixtures are
> more prone to detonation (which indicates to me a mixture near
> optimum, or near one of perhaps 2 optimums) and also considered to
> be hard to ignite - or is that only at a *much* leaner A/F ratio?
>
I have heard reports of 26:1;  If your engine is still running above
20:1 the extra air will prevent detonation.  The Japaneese have
production engines, I am not sure if used yet in states.
This is one of the reasons for the development of the wide range
O2 sensor.
alex


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