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.

Related Articles


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 December 20, 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 December 20, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary 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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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