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Originally Posted by bwilson4web
This sounds like a way to fool the control systems into either a richer or leaner mixture setting.
I suspect the hybrid vehicle ECM would simply adjust the throttle until it had the energy output needed. Meanwhile, the mixiture would be either too rich or too lean and the results would be lower MPG and higher emissions . . . not something I'd recommend.
Personally, I like the electric super-charger approach better. The boost is modest so no intercooler is needed. It can be an 'on demand' case which lets us keep normal MPG. Best of all, the regular engine controls and systems work normally. The vehicle just acts as if the pressure altitude went down a couple of thousand feet. On the high plains, the car should be quite zippy.
Bob Wilson
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in the old days, messing with the mixture like that would do nasty things like burn exhaust valves... if the hybrid uses exhaust gas O2 sensors, messing around with the mixture might just bring THAT feedback into the loop and counteract it.... i wrote to the eBayer and asked, "i thought the prius' engine control computers limited the rpms to about 4500....
what actual results have been seen with priuses?" if i get an answer (that's printable in a family forum
, i'll post it here.)
i LIKE the supercharger idea, though! all other things equal, "fooling the engine" into thinking it's at lower altitude with denser air just means, i'd bet, that it'll put out sea-level levels of power, which might be higher than a mile or two further up.
i also wondered why, or if, the Atkinson-cycle Prius engine couldn't be "educated" to know the altitude, or maybe just by using a preignition knock sensor, to close the intake valves a LOT sooner at high altitude, regaining the peak compression pressures of sea level, just by more vigorously changing the intake valves' timing....
??