Ombordmätning av bränsleförbrukning och avgasemissioner för en katalysatorbil vid körförlopp i verklig trafik

Download
Magnus Lenner

Fuel consumption, emissions of nitrogen oxides (NOx) and hydrocarbons (HC)  for a gasoline passenger car with catalyst were measured on-the-road for  three driving patterns. The on board measurement system developed at VTI  includes analyzers for gaseous pollutants, fuel flow metering, temperature  registration (oil, cooling water, fuel etc., total eight cases) as well as  logging of time and distance. Effects on emissions and fuel consumption of  road type and of cold start were studied. Distances of the three traffic  types representing City centre, Intermediate area and Motorway were  respectively 16.7 km, 20.1 km and 31.5 km. They were chosen to reflect the  traffic patterns mentioned.

Nitrogen oxides formation is favoured by the good  (complete) combustion resulting from high and constant engine load. This is  borne out by NOx emissions vs. mileage rising in order: City centre,  Intermediate, Motorway. Hydrocarbons and carbon monoxide, on the contrary,  are oxidized (to form carbon dioxide and water) by complete combustion, as  illustrated by HC declining in the same sequence. Fuel consumption decreasing  according to City centre, Intermediate, Motorway corroborates prevalent data  to the effect that specific fuel consumption is seen to increase with speed  in the high speed range. The report also describes extending of the  fuel/pollutant measurement instrumentation with a broadband alpha-sensor and  IR analyzers for monitoring of CO2 and high range CO and of low range CO.

MEET US


6
Oct

Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.
19-20
Oct

ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 

LATEST NEWS


2017-07-05

Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


2017-06-29

Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


2017-05-30

Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


2017-05-15

A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


2017-05-02

Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


2017-05-02

Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...