Off Highway Engineering - April 5, 2010 - 8

Technical Innovations
Powertrain Powertrain

Albonair’s new urea dosing system for diesel NOx reduction
To many engineers in the powertrain industry, death and taxes may be preferable to another unavoidable certainty: more and more stringent emissions regulations. To others, it is a challenge and obstacle to be conquered. One NOx-reduction technology for diesel engines that is becoming more ubiquitous is selective catalytic reduction (SCR). First used in industrial applications, SCR entered heavy-duty vehicle use in Europe about 2005. It is increasingly seen as a global solution for meeting emissions legislation for on- and off-highway vehicles. SCR essentially involves a chemical reaction during which a diesel exhaust fluid (DEF), typically urea, is injected into the exhaust stream where it converts to ammonia and then interacts with a catalyst to convert NOx into innocuous components such as N2, CO2, and water. According to Albonair, which is showing its urea-based SCR solution at the SAE 2010 World Congress April 1315, the key to optimizing SCR system effectiveness is ensuring the optimal droplet size of the DEF reducing agent when it is fed into the exhaust tract. This is ultimately a function of the even distribution of DEF onto the catalyst. Researchers from Albonair made extensive use of CFD to determine the evaporation rates for different droplet sizes. In essence, smaller droplets evaporate quickly and evenly while larger droplets evaporate slower with an uneven distribution. The company’s new urea dosing system is able to adjust the droplet size depending on the exhaust conditions, creating droplets with a Sauter mean diameter of less than 10 μm. This enables the DEF to vaporize within a few centimeters in the exhaust pipe. Albonair’s system consists of two parts: the housing with SCR catalysts, injection nozzle, and temperature and NOx sensors; and the urea tank with level and temperature sensors, dosing unit, and aftertreatment control unit. The benefit of this integrated design is the reduced number of variants for different vehicle types and OEMs, according to company engineers. One of the Albonair SCR system’s biggest claimed advantages for the customer, however, is its compactness and design flexibility, allowing integration into existing vehicle space. The urea dosing system itself has a mass of just 1.6 kg (3.5 lb). Because there are no moving components or sensors at the injection point, the nozzle can be positioned in high-temperature areas of the exhaust system without being damaged. Depending on customer design needs, the nozzle can be fixed to the exhaust pipe at a variety of positions. Jean L. Broge

Cummins readies four new Tier 4I engines for Bauma debut
In the run-up to Bauma, the mantra for Cummins is “4 More for Tier 4,” indicating the company’s intent of revealing its next generation of four-cylinder QSB3.3 and QSB4.5 engines for compact equipment, together with a first showing of the all-new QSX11.9 and QSX15 heavy-duty engines. The Tier 4 Interim engines will be on display as complete air-intake-to-exhaust aftertreatment systems, with all key technologies integrated by Cummins. The four new engines will join the previously shown QSB6.7 and QSL9 MidRange family in the Cummins booth at Bauma to complete a wide 75- to 600hp (56- to 447-kW) power lineup for Tier 4I. The standard takes effect in North America and the EU in January 2011 for engines above 173 hp (129 kW) and in January 2012 for engines above 74 hp (55 kW). The compact 3.3- and 4.5-L QSB engines extend from 75 to 160 hp (56 to 119 kW), enabling standardized fourcylinder installations with common Tier 4I architecture. Covering a power band from 300 to 600 hp (224 to 447 kW), the all-new 11.9- and 15-L QSX engines share the same performance-enhancing technology for Tier 4I, such as Cummins’ new XPI common-rail fuel system. According to Hugh Foden, Executive Director, Cummins Off-Highway Business, all four engines “bring a new power capability to the equipment industry for Tier 4 that goes beyond achieving very low emissions. They will realize up to 5% higher fuel efficiency and improve productivity. Additionally, our single-system approach, from air-intake-to-exhaust aftertreatment, enables easier machine integration for OEMs.” The QSB3.3 and QSB4.5 engines feature a scaled-down cooled exhaust gas recirculation (EGR) system and Cummins particulate exhaust aftertreatment, sized for compact equipment. Cummins’ new
www.offhighway-online.org

The SCR dosing system’s simple, compact overall design enables lower cost of ownership, claims Albonair.

The system consists of a dosing unit and an electronic control unit, both of which are fixed to a urea tank.

8

SAE OHE April 5, 2010


http://www.offhighway-online.org

Off Highway Engineering - April 5, 2010

Table of Contents for the Digital Edition of Off Highway Engineering - April 5, 2010

Off Highway Engineering - April 5, 2010
Contents
From the Editor’s Desk
Focus
Perkins Gets Specific at Bauma
Technical Innovations
Albonair's New Urea Dosing System for Diesel NOx Reduction
Cummins Readies Four New Tier 41 Engines for Bauma Debut
Dana Rolling into Bauma With Drivetrain Systems
ZF Premieres CVT at Bauma
Retarding the Cost of Carbon Composite Brakes
New Low-Friction Radial Seals Offer Fuel Efficiency Gains
Cambustion’s Analyzers Take Center Stage
Switching to New Controls
In the News
Save the Weight
Kubota Increases Midsize Tractor Options
Original Equipment
Bobcat Adds to New Midsize Excavator Models
Cat Unveils its “One-Machine Workforce”
Deere Offers New Zero-Turn Mowers
Vögele Widens Opportunities with Mini Paver
Prinoth Gets Carried Away With GO-TRACT
Trade Tools
What’s New at SAE 2010
Companies Mentioned
Index of the Advertisers
Off Highway Engineering - April 5, 2010 - Off Highway Engineering - April 5, 2010
Off Highway Engineering - April 5, 2010 - Cover2
Off Highway Engineering - April 5, 2010 - Contents
Off Highway Engineering - April 5, 2010 - 2
Off Highway Engineering - April 5, 2010 - 3
Off Highway Engineering - April 5, 2010 - From the Editor’s Desk
Off Highway Engineering - April 5, 2010 - Insert1
Off Highway Engineering - April 5, 2010 - Insert2
Off Highway Engineering - April 5, 2010 - Focus
Off Highway Engineering - April 5, 2010 - Technical Innovations
Off Highway Engineering - April 5, 2010 - 7
Off Highway Engineering - April 5, 2010 - Cummins Readies Four New Tier 41 Engines for Bauma Debut
Off Highway Engineering - April 5, 2010 - 9
Off Highway Engineering - April 5, 2010 - Dana Rolling into Bauma With Drivetrain Systems
Off Highway Engineering - April 5, 2010 - 11
Off Highway Engineering - April 5, 2010 - ZF Premieres CVT at Bauma
Off Highway Engineering - April 5, 2010 - Retarding the Cost of Carbon Composite Brakes
Off Highway Engineering - April 5, 2010 - New Low-Friction Radial Seals Offer Fuel Efficiency Gains
Off Highway Engineering - April 5, 2010 - Cambustion’s Analyzers Take Center Stage
Off Highway Engineering - April 5, 2010 - 16
Off Highway Engineering - April 5, 2010 - Switching to New Controls
Off Highway Engineering - April 5, 2010 - 18
Off Highway Engineering - April 5, 2010 - 19
Off Highway Engineering - April 5, 2010 - In the News
Off Highway Engineering - April 5, 2010 - 21
Off Highway Engineering - April 5, 2010 - Save the Weight
Off Highway Engineering - April 5, 2010 - 23
Off Highway Engineering - April 5, 2010 - 24
Off Highway Engineering - April 5, 2010 - Original Equipment
Off Highway Engineering - April 5, 2010 - Bobcat Adds to New Midsize Excavator Models
Off Highway Engineering - April 5, 2010 - Cat Unveils its “One-Machine Workforce”
Off Highway Engineering - April 5, 2010 - 28
Off Highway Engineering - April 5, 2010 - Vögele Widens Opportunities with Mini Paver
Off Highway Engineering - April 5, 2010 - 30
Off Highway Engineering - April 5, 2010 - Prinoth Gets Carried Away With GO-TRACT
Off Highway Engineering - April 5, 2010 - What’s New at SAE 2010
Off Highway Engineering - April 5, 2010 - 33
Off Highway Engineering - April 5, 2010 - 34
Off Highway Engineering - April 5, 2010 - 35
Off Highway Engineering - April 5, 2010 - 36
Off Highway Engineering - April 5, 2010 - 37
Off Highway Engineering - April 5, 2010 - 38
Off Highway Engineering - April 5, 2010 - 39
Off Highway Engineering - April 5, 2010 - Index of the Advertisers
Off Highway Engineering - April 5, 2010 - Cover3
Off Highway Engineering - April 5, 2010 - Cover4
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