SOURCE: Delphi Corporation

Delphi Corporation

April 14, 2010 09:00 ET

Delphi's Ammonia Sensor Helps Diesel Manufacturers Meet More Stringent NOx Emissions Regulations

Delphi's Innovative Ammonia Sensor Showcased at Prestigious SAE World Congress; To Be First Produced in 2012 for a European Commercial Vehicle Manufacturer

DETROIT, MI--(Marketwire - April 14, 2010) -  After years of pioneering research and testing, Delphi Corp. is the first company to develop and market an innovative technology for the automotive industry that could displace conventional products and help diesel manufacturers around the world meet stringent new emissions standards for nitrogen oxides (NOx). The Delphi ammonia sensor, which will be first produced in 2012 for a European commercial vehicle manufacturer, will be showcased here during the SAE World Congress, April 13-15.

Delphi's new ammonia sensor is first to allow closed-loop control of SCR process
Selective catalytic reduction (SCR) aftertreatment is becoming an increasingly popular choice for NOx control to help manufacturers meet diesel engine emissions requirements. And, the need for precise control of urea -- an ammonia rich compound required by the SCR system -- is expected to rapidly increase to meet demanding new emissions regulations. Delphi's ammonia sensor is the first technology that allows direct closed-loop control of the SCR process, permitting the amount of urea injected into the exhaust stream to be optimized. A second key function of the sensor is to provide on-board diagnostic information for the SCR system.

Sensor allows the engine to operate with higher fuel efficiency, while meeting tailpipe NOx standards
Delphi's ammonia sensor is intended for use in diesel vehicles equipped with an SCR system, including light-duty, medium-duty and heavy-duty diesel vehicles. It helps enable the SCR system to work at greater NOx conversion efficiencies, which allows the engine to operate with higher fuel efficiency while helping the vehicle meet new tailpipe NOx standards. It also provides manufacturers with the flexibility to potentially reduce or eliminate an expensive post-oxidation catalyst that would otherwise be needed to remove excess ammonia from the exhaust and to help enable the size of the SCR converter to be optimized. Additionally, by significantly reducing ammonia slip, the sensor provides the potential for significant cost savings for high-mileage operators who will be able to use less urea. Delphi's new ammonia sensor also offers compact dimensions and low cost. The key to these benefits is a new ammonia-sensitive material developed by Delphi, which is deposited onto a thick film ceramic substrate similar to the one proven in Delphi's oxygen sensors. 

Delphi's ammonia sensor helps enable new solution for diesel emissions control
"This is a major engineering breakthrough and helps enable an entirely new solution for emissions control in the diesel industry," said Da Yu Wang, principal staff scientist, Delphi Powertrain Systems. "Because of Delphi's exhaust sensor expertise and dedicated engineering and research teams, we overcame the difficult challenges of how to make this technology to provide repeatable and reliable results. We are the first to develop and manufacture the technology for automotive applications."

The use of SCR is expected to increase dramatically in both light-duty and heavy-duty diesel applications. SCR technology is already well established in the European heavy-duty truck market and will become increasingly important in the U.S. to enable compliance with new heavy duty regulations to be mandated from 2010. SCR is also used on passenger cars in the U.S. market to help achieve compliance with Tier 2 Bin 5 regulations for light duty vehicles and is expected to increase in popularity in Europe to help manufacturers meet Euro 6 regulations to be mandated for light-duty vehicles beginning in 2014.

About Delphi
Delphi is a leading global supplier of electronics and technologies for automotive, commercial vehicle and other market segments. Operating major technical centers, manufacturing sites and customer support facilities in 30 countries, Delphi delivers real-world innovations that make products smarter and safer as well as more powerful and efficient. Connect to innovation at

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