Hi,
Quote:
Originally Posted by 300TTto545
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There is a chart - on another site - that gives average mpg on the HCHII at different speeds with and without CC. It is an eye opener - like 90 mpg at 40 miles per hour. Without referencing another site (I never know if this is ok) - search for Tarabell - the article is awesome. I've read it many times.
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As long as you make a proper reference and cite the parts that are relevant to something you add, it is called "fair use." This is something we encourage. What we can't put up with is someone who does a wholesale, cut-and-paste, a copyright violation, or claims someone else's work without attribution, plagiarism. Responsible moderators, like team GreenHybrid.com, take this seriously. But let me use your Google-pointed reference to as an example:
http://www.cleanmpg.com/forums/showthread.php?t=1306
Quote:
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Test Steps:
1) Accelerate to desired speed (30, 40, 50, and 60 miles per hour). Maintain speed using cruise control, then zero Trip-A odometer and drive until 1.0 mile reached. Record trip FE.
2) Repeat above for all speeds, except without using CC.
Trip-A – Constant speed tests - MPG Results
With Cruise Control Run #30 miles per hour #40 miles per hour #50 miles per hour #60 miles per hour
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Average’s 85.3 mpg 89.7 mpg 67.1 mpg 51.8 mpg
Without Cruise Control Run #30 miles per hour #40 miles per hour #50 miles per hour #60 miles per hour
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Average’s 111.6 mpg 92.2 mpg 68.8 mpg 53.8 mpg...
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(minor edits to handle formatting issues) The following graph shows the data lines:
This is the type of empirical data needed to gain insights to how our hybrids work. I would prefer to see 3-5 runs and the raw results reported and not just the averages as the author points this out with:
Quote:
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As far as other environment conditions, ... but sometimes there were surprises between similar runs. ...
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Knowing where the variability exists can sometimes help us understand how reproducible the data will be. Sometimes this can lead to new insights.
When I bought my 2003 NHW11 Prius, I planned from the beginning to make an miles per hour vs MPG curve and this is my first chart:
Note that this data comes from weekly commuting and cross country runs of 120+ miles. The HCH and my Prius charts are different test conditions (a similar chart can be found at:
http://hiwaay.net/~bzwilson/prius/ca..._MPG_Rev_B.jpg.) Regardless, the mileage chart for the flight out came from the flight crews. I was recording data even before picking up the car. This is something I would like to see for all of our hybrids with 5 miles per hour differences.
Many times, plotting data allows us to see boundaries between different control laws and "knees" in the performance curves. This allows us to select the best speed for the performance we want and avoid those that cause problems. I've gained some insights about the HCH relative performance with a Prius.
Thanks for the posting!
Bob Wilson
ps. We don't have a problem with "fair use" of properly referenced and cited sources from other sites. We just ask for some relevance to hybrids or post non-hybrid stuff in "Anything goes" and keep the posts civil, no personal attacks or SPAM.
Re: What is the optium speed ..
