Influence of Combustion Chamber Deposits on Vehicle Performance and Tailpipe Emissions

962027

10/01/1996

Event
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Authors Abstract
Content
An experimental programme has been carried out to quantify the influence of Combustion Chamber Deposit (CCD) removal on vehicle acceleration performance, fuel consumption and tailpipe emissions in several modern European car models. Vehicles were performance and emissions tested dirty', following accumulation of 16,000 kilometres (10,000 miles) with a light duty cycle, then ‘clean’, following removal of CCDs. This scheme was repeated for one model using a heavy duty driving cycle. Additional tests were carried out on three vehicle models equipped with knock-sensors for which ignition timing was monitored. CCDs reduced fuel consumption relative to the clean engine, in amounts dependent on vehicle model. CCDs had only small, detrimental effects on acceleration performance and power. They generally (but not always) increased NOx emissions and had variable and usually small effects on HC and CO emissions. Under fairly extreme, knock-critical conditions, vehicles with knock-sensors can show neutral or slightly increased fuel consumption with CCDs present, due to ignition timing retard.
Meta TagsDetails
DOI
https://doi.org/10.4271/962027
Pages
21
Citation
Barnes, J., and Stephenson, T., "Influence of Combustion Chamber Deposits on Vehicle Performance and Tailpipe Emissions," SAE Technical Paper 962027, 1996, https://doi.org/10.4271/962027.
Additional Details
Publisher
Published
Oct 1, 1996
Product Code
962027
Content Type
Technical Paper
Language
English