Change search
ReferencesLink to record
Permanent link

Direct link
Motorhantering under stopptid: tomgång eller avstängning. Utsläpp under krypkörning: avgasmätningar och litteraturgenomgång
Swedish National Road and Transport Research Institute.
Swedish National Road and Transport Research Institute.
2005 (Swedish)Report (Other academic)Alternative title
Engine management during standstill periods : idling or engine turn-off. Emissions during crawling speed conditions - Exhaust measurements and a survey of the literature (English)
Abstract [sv]

There is a scarcity of data on which decisions can be based regarding the

limitation of idling during standstill periods. There is also reason to

believe that the significance of engine management during standstill may vary

between different propulsion systems and technical standards etc, which will

increase the need for a decision base. The need for data that describe exhaust

emissions during crawling speed is particularly great in the case of tunnels.

Ventilation plants in tunnels are designed on the basis of relationships

between emissions and mean speed. Up till now, for speeds below 30 km/h, these

relationships have not been satisfactorily based on measured data. The primary

objective has been to fill the gaps in knowledge by exhaust measurements. The

methodology has comprised a survey of the literature, measurements and

analyses. Different objectives result in different limiting times for idling

during standstill periods. For the vehicle fleet as a whole, different limits

have been estimated for different objectives: for private economy, 12 seconds;

for macro economy overall, 23 seconds; for energy policy, 12 seconds, and for

air quality, 36 seconds. There are also time limits per compound, per

technical standard and per vehicle type. The time for diesel is shorter than

for petrol engine. According to measurements, emission of oxides of nitrogen

(NOx) at crawling speed varies over the range -51 and 171% for different

engine types when speed drops from 25 to 10 km/h. There are considerable

differences in the speed dependence of fuel consumption both between and

within studies. The relationships which could be estimated for particulate

emissions do not, in any one case, indicate an increase in emission as speed

drops from 25 km/h.

Place, publisher, year, edition, pages
Linköping: VTI., VTI rapport 519 , 2005. , 151 p.
VTI rapport, ISSN 0347-6030
Keyword [en]
Emission, Measurement, Idling, Snow, Driving, Speed, Time, Carbon dioxide, Hydrocarbon, Carbon monoxide, Nitrogen oxide, Particle, Air pollution, Catalytic converter, Petrol, Diesel engine, Calculation, Mathematical model
Research subject
Road: Transport, society, policy and planning, Road: Environment
URN: urn:nbn:se:vti:diva-6385OAI: diva2:675262
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

Open Access in DiVA

fulltext(751 kB)254 downloads
File information
File name FULLTEXT01.pdfFile size 751 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Hammarström, UlfYahya, Mohammad-Reza
By organisation
Swedish National Road and Transport Research Institute

Search outside of DiVA

GoogleGoogle Scholar
Total: 254 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 17 hits
ReferencesLink to record
Permanent link

Direct link