Hi Florian,
I have two points before we start to investigate in detail:
* Which car-following model did you use? Unfortunately, elevation data
is not used universally in sumo yet but only by certain components
(see docs
<https://sumo.dlr.de/docs/Networks/Elevation.html#models_that_use_elevation_data>
)
* Even if the elevation is not used, it increases the edge lengths a
bit (Pythagoras ...). Nonetheless, it seems strange the consumption
is lower elevation...
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-user] HBEFA Emission Model
Datum: 2023-08-21T09:26:48+0200
Von: "Florian Schnepf via sumo-user" <[email protected]>
An: "[email protected]" <[email protected]>,
"[email protected]" <[email protected]>
Hello Daniel,
I've got it now. Thank you for taking the effort to give me this detailed
answer.
It would be great if someone could explain the consumption behaviour of my
experiment.
Best regards
Florian
Gesendet: Montag, 21. August 2023 um 09:17 Uhr
Von: [email protected]
An: [email protected]
Cc: [email protected]
Betreff: AW: AW: [sumo-user] HBEFA Emission Model
Hello Florian,
Well, obviously, I did not explain it properly.
Vehicular emissions mainly depend on the acceleration and the speed, with
acceleration being the major influence.
As SUMO is a microscopic model where the vehicles’ speed and acceleration
are known, this information is used in all of SUMO’s emission models.
But within the original HBEFA, no dependency between accelerations and
emissions exists. HBEFA is an inventory models which only gets vehicle
types (the vehicle fleet in fact), the mileage, and the traffic state as
inputs – and the slope.
Now slope can be transformed into acceleration – the power needed to
climb is physically of the same type as the power needed to accelerate.
And that has been done when transferring HBEFA-values into SUMO’s
HBEFA-based emission model.
This means SUMO uses the acceleration and the speed though acceleration
was not given in the original HBEFA.
Now I must admit that I do not know why your values differ only by such
small values. I have never worked with elevations in SUMO.
Maybe someone else can answer this.
Sincerely,
Daniel
Von: Florian Schnepf <[email protected]>
Gesendet: Samstag, 19. August 2023 15:40
An: Krajzewicz, Daniel <[email protected]>; [email protected]
Betreff: Aw: AW: [sumo-user] HBEFA Emission Model
Hi Daniel,
What happens when there is no information about the slope?
I have made some tests with one network with increases and one without,
as well as two HBEFA emission models.
The results show that there is very little difference on average.
* Diesel vehicle:
With elevation: 22.319 g
without elevation: 22.495 g
* Fuel cell vehicle:
With elevation: 6.374 g
without elevation: 6.522 g
I would expect consumption to be higher with elevation than without.
Does this mean that the information about the slope does not contribute
to the calculation of the consumption, since it replaces the influence of
acceleration?
Best regards
Florian
Gesendet: Montag, 14. August 2023 um 10:54 Uhr
Von: [email protected] <mailto:[email protected]>
An: [email protected] <mailto:[email protected]>
Cc: [email protected] <mailto:[email protected]>
Betreff: AW: [sumo-user] HBEFA Emission Model
Hello Florian,
well, no.
HBEFA has the information about the influence of slope on emissions. On
the other hand, as HBEFA uses (macroscopic) traffic states, it does not
use (microscopic) acceleration.
So, when deriving emissions from HBEFA, we used the slope information
for replacing the missing influence of accelerations.
Sincerely,
Daniel
Von: sumo-user <[email protected]
<mailto:[email protected]> > Im Auftrag von Florian Schnepf
via sumo-user
Gesendet: Montag, 14. August 2023 10:51
An: [email protected] <mailto:[email protected]>
Cc: Florian Schnepf <[email protected]
<mailto:[email protected]> >
Betreff: [sumo-user] HBEFA Emission Model
Hello,
I read in a paper about the emission models that the HBEFA model does
not depend on acceleration and therefore the slope is used for
compensation.
I do not understand how this is meant. Can someone explain to me how
this was implemented?
Thanks a lot
Best regards
Florian
_______________________________________________
sumo-user mailing list
[email protected]
To unsubscribe from this list, visit
https://www.eclipse.org/mailman/listinfo/sumo-user
