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Deere announces technology to meet off-highway emissionsJohn Deere Power Systems (JDPS) has announced the technology solutions it will use to meet the stringent Interim Tier 4/Stage III B mobile off-highway emissions regulations for engines 130 kW (174 hp) and above. These emissions regulations, which begin in 2011, require a 90 percent reduction in diesel particulates (PM) and a 50 percent reduction in oxides of nitrogen (NOx) from previous Tier 3/Stage lll A requirements. To achieve compliance with these emissions regulations, John Deere will start with its proven Tier 3 PowerTech Plus engine platform, add a diesel oxidation catalyst (DOC)/diesel particulate filter (DPF) unit for reducing particulates, and increase the percentage of cooled exhaust gas recirculation (EGR) for NOx control. John Deere will not use selective catalytic reduction (SCR), an alternate NOx reduction technology, for Interim Tier 4 because the EGR and DOC/DPF technology path is more proven, simpler and less costly to operate. PowerTech Plus engine models in the 130 kW (174 hp) and above power class include the 6.8L, 9.0L and 13.5L in-line, six-cylinder engines, all of which feature a four-valve cylinder head, high-pressure fuel system, variable geometry turbocharger (VGT) and an air-to-air aftercooling system. For Interim Tier 4, the cylinder head, fuel system, EGR, VGT and air-to-air aftercooling systems will be updated but will be similar to Tier 3 configurations. The engine control unit (ECU), developed and manufactured by Phoenix International, a business unit of John Deere's Intelligent Mobile Equipment Technologies, will change substantially to provide twice the RAM, double the processing speed and four times the program memory of the previous version to handle requirements of added sensor and control logic. "After much evaluation and testing, we found that a DOC/DPF and increased use of EGR, coupled with our proven Tier 3 PowerTech Plus engine platform is the best Interim Tier 4 solution for meeting emissions and for delivering the performance, reliability, durability and low operating costs our customers have come to expect from John Deere engines," said John Piasecki, director of worldwide marketing, sales and customer support for JDPS. John Deere has developed its DOC/DPF unit specifically to meet the demands of off-highway applications. The DOC component reduces carbon monoxide, hydrocarbons and some particulate matter (PM). The downstream DPF traps and holds particulates remaining in the exhaust stream. Trapped particles are eventually incinerated within the DPF through a process known as regeneration. In most cases, the regeneration process will not have an impact on machine operation and will not be noticeable to the operator. Another benefit of the DOC/DPF is that it replaces the need for a muffler in most applications. Interim Tier 4 regulations require engine manufacturers to also consider crankcase emissions, which must either be managed via a crankcase filter or must be counted in the total engine emissions. The next generation of John Deere engines will be equipped with either a closed or open crankcase ventilation system (CCV/OCV) to manage these crankcase emissions. Interim Tier 4 emissions regulations for engines from 56 kW to 129 kW (75 hp-173 hp) are effective in 2012. For more information, call 800-JD-ENGINE (800-533-6446), or visit www.JohnDeere.com/jdpower. 4/7/08 Date: 3/28/08
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