Stratified Charge DI with EGR

[Mike (Perth, Western Australia)]

At 11:27 AM 12/3/2000 +0800, Bernd Felsche <bernie at perth.dialix.com.au> wrote:
>Mike writes:
>>>Very much leaner than stoich - Bosch describes mixtures as lean as
>>>2.5; any leaner than 1.5 and stratified charge operation leads to
>>>soot formation; any leaner than 1.3 in homogenous mixture formation
>>>and ignition can fail, leading to a prohibited band of AFR which the
>>>engine management system must skip on the load transitions.
>
>>Sorry not with you on the numbers/terminology, in respect of AFR of 14.7
>>to 1 stoich whats the 2.5, 1.5, 1.3 refer to in relation to AFR ?
>
>Those are lambda values where 1 == 14.7:1 AFR

Ah I see, you mean the lambda value is a multiplier, therefore 2.5 is
really 2.5 * 14.7 = 36.75 - seems 'awfully' lean - blimey... ?

>There's a tech-brief online and paper (1999-01-1284) available
>either for download or in a compendium "Gas Direct Injection
>Aftertreatment and Exhaust Aftertreatment Modeling" (SP-1455) on the
>SAE web site - search for MED7.

Tah, thanks for the reference,

:) mike

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