Featured Research

from universities, journals, and other organizations

Finding faults in exhaust gas systems

Date:
February 21, 2011
Source:
SINTEF
Summary:
New technology can be used to measure soot particles in the exhaust of diesel engines, reducing emissions from diesel-powered vehicles and improving their energy efficiency. After three years of development, Norwegian scientists can now measure the soot content of a vehicle's exhaust while it is actually on the road. The new sensor measures soot particles in the exhaust gas after it has passed the particle filter, rather than before.

New technology can be used to measure soot particles in the exhaust of diesel engines, reducing emissions from diesel-powered vehicles and improving their energy efficiency.

After three years of development, Norwegian scientists can now measure the soot content of a vehicle's exhaust while it is actually on the road. The new sensor measures soot particles in the exhaust gas after it has passed the particle filter, rather than before. Project manager Andreas Larsson, a scientist at SINTEF, believes that continuous measurements of emissions will be in demand in the future. "Stricter emission limits for CO2 and other pollutants will lead to demands for better monitoring of vehicle exhaust gases," he says.

Measures "scrubbed" exhaust

Measuring soot when a vehicle is actually on the road has been a major challenge, but by applying a principle known as thermophoresis, the scientists have managed to measure soot concentrations in clean, or "scrubbed" exhaust.

"Thermophoresis is a physical phenomenon that draws microscopic soot particles in the exhaust gas towards cold particles or regions in the gas. When soot particles collide with high-energy hot particles, they are forced towards colder, less energy-intensive regions. In other words, particles are transported from hot to cold parts of the system," says Larsson.

The sensor itself is installed in the middle of the gas flow, so that it is exposed to the high-temperature exhaust gas. If the sensor is kept cold enough, solid particles in the exhaust gas will be attracted to the cold surface of the sensor, where they can be measured.

Temperature-sensitive

A further challenge was therefore to reduce the sensor temperature by 50 to 70 degrees relative to the hot exhaust, which can reach temperatures as high as 100 to 300 degrees Celsius.

The scientists solved this problem by fitting a heat-conducting shield around the sensor. Between the heat shield and the sensor is a heat-conducting air layer that prevents heat from reaching the sensor.

Several applications

SINTEF patented the cooling principle in 2009. A good deal of research still needs to be done before it can be brought into commercial use, but so far, the results are promising. The primary field of application will be diagnosing technical faults in vehicle exhaust systems, such as cracks in the particle filter.

The scientists believe that in the longer term, the sensor will also be able to lower vehicle energy consumption, and thus help to reduce emissions of the greenhouse gas CO2 and other pollutants such as NOx and particles.

Volvo Technology, which is a central partner in the project, has applied for a patent on the method together with Volvo Car Corporation.


Story Source:

The above story is based on materials provided by SINTEF. Note: Materials may be edited for content and length.


Cite This Page:

SINTEF. "Finding faults in exhaust gas systems." ScienceDaily. ScienceDaily, 21 February 2011. <www.sciencedaily.com/releases/2011/02/110221081541.htm>.
SINTEF. (2011, February 21). Finding faults in exhaust gas systems. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2011/02/110221081541.htm
SINTEF. "Finding faults in exhaust gas systems." ScienceDaily. www.sciencedaily.com/releases/2011/02/110221081541.htm (accessed July 24, 2014).

Share This




More Matter & Energy News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com
Boeing Ups Outlook on 52% Profit Jump

Boeing Ups Outlook on 52% Profit Jump

Reuters - Business Video Online (July 23, 2014) Commercial aircraft deliveries rose seven percent at Boeing, prompting the aerospace company to boost full-year profit guidance- though quarterly revenues missed analyst estimates. Bobbi Rebell reports. Video provided by Reuters
Powered by NewsLook.com
Europe's Car Market on the Rebound?

Europe's Car Market on the Rebound?

Reuters - Business Video Online (July 23, 2014) Daimler kicks off a round of second-quarter earnings results from Europe's top carmakers with a healthy set of numbers - prompting hopes that stronger sales in Europe will counter weakness in emerging markets. Hayley Platt reports. Video provided by Reuters
Powered by NewsLook.com
9/11 Commission Members Warn of Terror "fatigue" Among American Public

9/11 Commission Members Warn of Terror "fatigue" Among American Public

Reuters - US Online Video (July 22, 2014) Ten years after releasing its initial report, members of the 9/11 Commission warn of the "waning sense of urgency" in combating terrorists attacks. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins