Update:
Jakob pointed out that the acceleration/deceleration values I'd used here were
very low - I repeated the exercise using the theoretical (ie "manufacturer
specification") value for acceleration and a default for deceleration, then
with +/- 10% values for acceleration/deceleration. The latter was run under
reduced traffic conditions = higher speeds/lower efficiency.
[image.png]
For the values for which I have multiple real-world data points (short
urban/short mixed) the specification acceleration in Sumo shows a reduced
efficiency relative to my real world. I might posit that the closer fit of the
low acceleration value may reflect my "senior" driving style :)
The updated vType aligned with the vehicle specification is as follows:
<vType id="soulEV65" minGap="2.50" maxSpeed="46.0" color="white" accel="3.6"
decel="4.5" sigma="0.0" emissionClass="Energy/unknown">
<param key="airDragCoefficient" value="0.35"/> <!--
https://www.evspecifications.com/en/model/e94fa0 -->
<param key="constantPowerIntake" value="100"/> <!-- observed summer levels -->
<param key="frontSurfaceArea" value="2.6"/> <!-- computed (ht-clearance) *
width -->
<param key="has.battery.device" value="true"/>
<param key="internalMomentOfInertia" value="0.01"/> <!-- guesstimate -->
<param key="maximumBatteryCapacity" value="64000"/>
<param key="maximumPower" value="150000"/> <!-- website as above -->
<param key="propulsionEfficiency" value=".98"/> <!-- guesstimate value
providing closest match to observed -->
<param key="radialDragCoefficient" value="0.1"/> <!-- as above -->
<param key="recuperationEfficiency" value=".96"/> <!-- as above -->
<param key="rollDragCoefficient" value="0.01"/> <!-- as above -->
<param key="stoppingTreshold" value="0.1"/> <!-- as above -->
<param key="vehicleMass" value="1830"/> <!-- 1682kg curb wt + my average 2
passengers / bags -->
</vType>
cheers
Div
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, November 15th, 2021 at 14:05, The div <[email protected]> wrote:
> This thread piqued my interest and I've been trying to model the real world
> behaviour of my own EV (a Kia Soul EV 2020) - so I share this for your
> amusement!
>
> I extracted a map of England from OSM and cut out an area for which I had
> trip information.
> - specifically some relatively local journeys I have made frequently and a
> few longer distance journeys which were single data points.
>
> As noted in the thread the values appropriate to a bus considerably overstate
> the radial drag coefficient for a car - this and the vehicle mass had most
> impact on my modelling.
> Whilst I modelled the exact routes I couldn't model traffic because of the
> scale and complexity of the longer routes. (I did scale up the simulation to
> increase congestion in the urban parts of the route and get overtaking
> behaviour into the motorway route sections but ....) With those caveats I
> believe SUMO provides very good correlation with my observed efficiency cf:
> [image.png]
> These routes are on UK roads which have general limits of 30/40mph in urban
> areas and 70mph on motorways - the specific values having been set by the OSM
> import.
> The variation observed in the real world short routes appears to be
> temperature related (eg morning vs afternoon). The single data point routes
> were made in early August.
>
> I played with artificial routes of comparable distances but could not get
> realistic or even proportionate efficiency outputs - those models always
> produced much higher efficiency values (double) than can be achieved, a
> realistic model encompassing junctions, roundabouts etc seems necessary.
>
> I settled on the following vType as being most representative of my driving
> style - the relative efficiencies gave a comparable ratio to energy
> consumed/recuperated as reported by my vehicle.
> <vType id="soulEV65" minGap="2.50" maxSpeed="29.06" color="white" accel="1.0"
> decel="1.0" sigma="0.0" emissionClass="Energy/unknown">
> <param key="airDragCoefficient" value="0.35"/> <!--
> https://www.evspecifications.com/en/model/e94fa0 -->
> <param key="constantPowerIntake" value="100"/> <!-- observed summer levels -->
> <param key="frontSurfaceArea" value="2.6"/> <!-- computed (ht-clearance) *
> width -->
> <param key="has.battery.device" value="true"/>
> <param key="internalMomentOfInertia" value="0.01"/> <!-- guesstimate -->
> <param key="maximumBatteryCapacity" value="64000"/>
> <param key="maximumPower" value="150000"/> <!-- website as above -->
> <param key="propulsionEfficiency" value=".98"/> <!-- guesstimate value
> providing closest match to observed -->
> <param key="radialDragCoefficient" value="0.1"/> <!-- as above -->
> <param key="recuperationEfficiency" value=".96"/> <!-- as above -->
> <param key="rollDragCoefficient" value="0.01"/> <!-- as above -->
> <param key="stoppingTreshold" value="0.1"/> <!-- as above -->
> <param key="vehicleMass" value="1830"/> <!-- 1682kg curb wt + my average 2
> passengers / bags -->
> </vType>
> Whilst these figures model a Soul they should be easily tweaked for any of
> the Hyundai/Kia EV range that basically use the same electric powertrain.
>
> cheers
> Div
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