Back in the 50's this type of driving was sponsor by the Amoco Oil Co. back in
the New England states. In Rhode Island it is dead flat back there. My car
could easily get 22.5 mpg driving 40 to 60 mph using Amoco 100+ octane white
gas that had no lead in it which was paraffin base.
As I drove out west the fuel mileage drop to as low as 8 mpg with a fuel that
is asphalt base with a low octane down to 60. At the increase elevation, I had
to increase the timing from 32 degrees to 38 degrees to get at least 13 mpg.
We have roller coaster hills here in Great Falls, Montana. On one road,
leaving my home, going south it is a 0.5 mile straight up, 0.1 mile turn around
on top and 0.5 mile back to my home. It takes 75 battery amps going up and 0
amps going down. The ampere hour use is normally between 3.3 to 3.6 ah to
driving 1.1 miles
Now is I drive east from my home on a road that is level for 1.1 miles, it
takes 3.9 to 4.1 ampere hour for the 1.1 miles. The reason that there is more
energy use, the EV is using power all the way using 75 battery amperes in a
overall gear ratio of 10 to one.
Going up steep hills, I select a 27.57 to one gear ratio which sometimes call a
great grandma gear.
Roland
----- Original Message -----
From: Lee Hart<mailto:[email protected]>
To: Electric Vehicle Discussion List<mailto:[email protected]>
Sent: Friday, November 22, 2013 12:12 PM
Subject: Re: [EVDL] EVLN: Kia Soul EV goes
globalandaimsfor120-miledrivingrange
damon henry wrote:
> It is obvious to anyone that has attempted anything like this in the
> real world with real parts that a vehicle will be more efficient on
> level ground than with hills.
Well, there are special-case solutions where this is not true.
ICEs have a "sweet spot" where they are the most efficient. This is
usually at a higher horsepower than you need to drive at a continuous
speed. So a classic way to win an mpg contest is to "pulse and glide":
- Start the ICE and run it at its peak efficiency point.
This is a lot of horsepower, so the vehicle accelerates.
- When it reaches a speed where aerodynamic losses would begin
to detract, shut off the ICE.
- Coast back down to some low speed; enough to restart the
the ICE by putting it in gear.
Mileage contest winners since the 1930's have used this technique to get
amazing miles per gallon, even with crude old engines.
Obviously, you don't want to drive on real roads like this. The guy
behind you (or the passenger sitting next to you) would get very annoyed.
But as I recall, sometime in the 1950's, someone set an mpg record where
he drove at constant speed on normal roads and got over 100 mpg. He used
the "pulse and glide" technique; but had carefully chosen his route to
be a loop with a big hill. At the top, he'd shut off the ICE and coast
down. The slope was just right to maintain the normal speed limit. At
the bottom of the hill, he started the ICE and drove back up to the top.
The ICE's optimal horsepower happened to be just right to do the speed
limit back up.
So he got *better* mpg than he would have gotten without the hill, and
could drive at normal speeds as well. :-)
--
We need something like the Manhattan Project. We need some urgency
saying, "Here’s what we should be doing. We’ve got to get off fossil
fuels.” -— Lee Iacocca
--
Lee Hart -- See my Xmas projects at
www.sunrise-ev.com/projects.htm<http://www.sunrise-ev.com/projects.htm>
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