Stratified Charge DI with EGR
Bernd Felsche
bernie at perth.dialix.com.au
Sun Mar 12 10:09:12 GMT 2000
Mike writes:
>At 05:10 PM 11/3/2000 -0700, you wrote:
>>>>The complication has its rewards; 15% less fuel consumption, partly
>>>>due to increased "volumetric efficiency" because the throttle is
>>>>often wide open... better find an updated abbreviation to replace
>>>>WOT!
>>It would be far more accurate to call this "decreased pumping losses" than
>>"increased volumetric efficiency".
>Yes thats a good point, because with higher EGR it takes energy to pump this
>inert gas around the system - I would have thought not that efficient.
>Decreased pumping losses for 'fresh air' would be spot on...
Well, the EGR isn't actually pumped - it's vented according to the
literature which only indicates a valve to regulate the amount of
EGR. The manifold pressure is also sensed, probably so that the
amount and rate of EGR, as much as ensuring that you have a pressure
drop when the control valve opens.
The necessary energy must still be available at the exhaust to pump
its way around - that's normally "wasted" - unless you have a turbo.
--
Real Name: Bernd Felsche
Email: nospam.bernie at perth.DIALix.com.au
http://www.perth.dialix.com.au/~bernie - Private HP
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