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Old 06-27-2017, 02:04 PM   #11 (permalink)
bwilson4web
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Location: Huntsville, AL
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17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

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Quote:
Originally Posted by Old Tele man View Post
...easily replicated on a single graph vs, mph.
I'd probably want a couple of graphs to include significant loads like A/C and three temperatures: 32F, 70F, and 95F. Alternatively an MPG adjust as a function of temperature.

The hard one is to handle acceleration/deceleration at different power/brake rates. Perhaps a standing start maximum acceleration to a fixed speed, say 30 mph, 50 mph, and 70 mph followed by maximum braking back to stationary. Do it for say 10 cycles and report the MPG at the resulting block-to-block speeds: 15 mph, 25 mph, and 35 mph.

The Cruze diesel would have an acceleration cost based upon the speed and inertial changes BUT it would have no regeneration power because it has to heat the brake pads to stop. In contrast, our Prius Prime and BMW i3-REx would have regeneration curves recovering part of the inertial energy.

Bob Wilson

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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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