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Re: [sumo-user] Question about HBEFA4 emission model

Dear Jakob,

 

thanks for the suggestion – I will revisit the values given in fuel_perVeh.

 

 

Warmest regards,

 

Addina

 

Von: sumo-user <sumo-user-bounces@xxxxxxxxxxx> Im Auftrag von Jakob Erdmann via sumo-user
Gesendet: Freitag, 7. März 2025 15:21
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Cc: Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Betreff: Re: [sumo-user] Question about HBEFA4 emission model

 

Instead of looking at fuel_normed for this comparison, I suggest you look at fuel_perVeh. At lower speed limits, the total number of vehicles that manages to fit through the network may be lower as well and this reduced flow skews the fuel_normed results.

regards,

Jakob

 

Am Do., 6. März 2025 um 08:30 Uhr schrieb Addina Shafiyya Ediansjah via sumo-user <sumo-user@xxxxxxxxxxx>:

Dear all,

 

I have modeled an example road stretch with an uphill slope of 2%, and vice versa a downhill slope of -2% going the opposite direction. A traffic light is situated between the 200 – 250 m mark. I created a peak morning scenario (8 to 9 a.m.) using a given vehicle fleet composition and wanted to see the difference in emission behavior (HBEFA4-based) (https://sumo.dlr.de/docs/Models/Emissions/HBEFA4-based.html) for an uphill and downhill slope using an aggregated measure (edge) (https://sumo.dlr.de/docs/Simulation/Output/Lane-_or_Edge-based_Emissions_Measures.html). A brief explanation of the scenarios are as follows:

 

  1. Baseline: base case, green light period 36 s (total cycle: 90 s), speed limit 30 km/h
  2. Green times: extension of green light periods to 72 s
  3. Speed limit: increase of speed limit to 50 km/h

 

Attached you receive the resulting plot of normed fuel (line) & speed (dot) with respect to road length. The speed on the secondary axis is the mean speed on the edge (https://sumo.dlr.de/docs/Simulation/Output/Lane-_or_Edge-based_Traffic_Measures.html). I noticed that the normed fuel increases for a speed limit of 50 km/h where I would have expected it to decrease. For Euro 4 to Euro 6d petrol & diesel passenger cars, fuel consumption emission factors (in g/km) decreases with increase of speed limit from 30 km/h to 50 km/h (based on HBEFA 4.2 database). Would you perhaps have an explanation for this?

 

I would appreciate any suggestions as I am still new to the software. Thank you in advance.

 

 

Warmest regards,

 

Addina

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