Altitude compensation (Re: 286 Vindication)

[Bruce Bowling]

~ 
~ >Isn't it true that for a speed density efi system with an _absolute_ MAP 
~ >sensor, then altitude compensation is not needed?  For example, if you 
~ >changed altitude, the barometric pressure changes, which changes the 
~ >pressure in the manifold, which the MAP sensor directly measures. 
~ > Temperature (air density) compensation is still needed.
~ >
Yes, this is true iff one cares only about pressure differential across
the throttle plates.  This is the method employed in air flow benches.

- Bruce

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               Bruce A. Bowling
  Staff Scientist - Instrumentation and Controls
 The Continuous Electron Beam Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23602
                 (804) 249-7240
                bowling at cebaf.gov  
        http://devserve.cebaf.gov/~bowling
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