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40 or 28 miles? Which AER driving profile did GM choose?

18081 Views 35 Replies 12 Participants Last post by  Tom
What is your normal driving profile? It will have a huge effect on the Volt’s Average Electric Range, AER. Compare three common driving profiles the EPA75, HWY, and US06. We note that these profiles are dynamometer profiles. They are not done in the wind, rough roads, or on road grades, all of which lower AER. Nor are they done with max power (209 motor hp) to simulate passing. The goal of these profiles was to check and compare emissions, not evaluate EV performance, such as AER.

The EPA Federal Test Procedure, EPA75, is called the City Cycle. It consists of the Urban Driving Cycle, UDDS, followed by the first 505 seconds of the UDDS. It has a top speed of 56.7 mph. It uses a maximum of 37 hp road power. See attachment.

The EPA Federal Test Highway Procedure, HWY, has a top speed of 59.9 mph. It uses a maximum of 30 hp road power. See attachment.

The US06 Supplemental Federal Test Procedure (SFTP) was developed to address the shortcomings with the FTP-75 test cycle in the representation of aggressive, high speed and/or high acceleration driving behavior, rapid speed fluctuations, and driving behavior following startup. It represents an 8.01 mile (12.8 km) route with an average speed of 48.4 mph, maximum speed 80.3 mph, and a duration of 596 seconds. It uses a maximum of 89 hp road power. See attachment.

I did a detailed second by second Volt simulation with these three profiles. The results were an AER of 40.2, 39.6, and 28 miles for the EPA75/UDDS, HWY, and US06 profiles, respectively.

Does anybody have a recommendation for a representative EV driving profile? Google did some work for improved EV fuel economy profiles. I'll check into that.

The simulation is attached below.


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Quit fighting it and making excuses get more range.
I disagree. Right now range is too expensive. It just isn't cost effective to pay more for range that few will really need.

Think about it from GM's and an unbiased outsiders view. Initially you will offer ONE car. Key words being initially and ONE. This car will NOT be a good fit for all. Actually it would be better to offer the Chevy Volt with a 20 mile range instead of 40 initially. Because with a 20 mile range they could sell twice as many cars... INITIALLY.

The world will get more benefit from twice as many people driving a car with half the electric range because more gasoline is displace this way. And although it isn't going to cut out all of peoples gas cost it will give a huge benefit but cutting out most of it.

The only reason that the range is being set at 40 miles is to show people that electric is viable, can give you the range you need and not leave you stranded when the battery is exhausted at a reasonable price.

Give it a time and I am sure more battery options will be offered as your choice of range extended electric vehicles grows.

If you are clamoring for more electric range that means you will use more than 40 miles in your commute. That would displace over 10,000 miles of gas driving each year. For someone to drive 20,000 miles a year that is a lot, and the volt would still displace over half of your gasoline cost assuming you don't use the electric on the weekends at all.
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