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Navistar Switching Technology for Diesel Emissions

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LISLE, Ill., July 9, 2012 — Truck builder and engine manufacturer Navistar International Corp. plans to adopt a new “clean engine” technology for its diesel engines to meet U.S. Environmental Protection Agency 2010 regulations for NOx emissions. The new In-Cylinder Plus (ICT+) design will be Navistar’s first adoption of “selective catalytic reduction” (SCR) technology, in place of the “exhaust gas recirculation” (EGR) technology it has used up until now.

EGR recirculates part of a diesel engine's exhaust gas to the cylinders, where it replaces some excess oxygen prior to combustion. The EGR method that Navistar has used is one that EPA engineers originated and Navistar licensed, and then co-developed with EPA for commercial applications, but it has been ineffective at meeting the 2010 emissions standard. EPA ruled in February that the company would face noncompliance penalties of up to $2,000/day for each engine it sells that fails to meet the federal standard of 0.20 grams of nitrogen oxide per brake-horsepower hour.

Since then Navistar has been relying on earned emissions credits and paying the NCPs to maintain compliance, but in June a U.S. Court of Appeals ruled that Navistar can no longer pay NCPs for manufacturing noncompliant engines. The new combustion technology would overcome that setback, and if successful, settle its problem with EPA 2010 compliance.

"Our distinctive solution will leverage the investment and advancement we've made in clean engine technology while providing immediate certainty for our customers, dealers, employees and investors," stated Navistar chairman Daniel C. Ustian. "We have made tremendous progress with in-cylinder technology and with the introduction of ICT+ our goal is to offer the world's cleanest and most fuel-efficient diesel engine—benefiting both our customers and the environment for years to come."

Navistar’s main competitors in the diesel engine sector, including Cummins Inc. and Volvo Group North America LLC, adopted the alternative SCR technology, with greater success.

The SCR process introduces a gaseous reducing agent (often ammonia or urea) to the exhaust gas to convert nitrogen oxides (NOx) into N2 and CO2.

Navistar said its new process technology, ICT+, combines its “in-cylinder engine expertise with a urea-based reducing agent.” It said it expects the new technology to be commercially ready in early 2013, and available to incorporate in its current vehicle designs.

The company plans to continue manufacturing its current-model EPA-compliant trucks in all vehicle classes, using combinations of earned emissions credits and/or noncompliance penalties (NCPs), as appropriate, during the transition to ICT+.

"We've shared our new technology path with the EPA and California Air Resources Board (CARB), and both agencies are encouraged by our plans," according to Ustian. "We will continue to work with the agencies to ensure that our customers receive uninterrupted deliveries in all 50 states during this transition."

Source: americanmachinist.com, © 2012 Penton Media Inc. All Rights Reserved.

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