John Deere has announced that it will combine selective catalytic reduction (SCR) and exhaust gas recirculation (SCR) systems on its engines to meet European Union Stage IV and United States Tier 4 Final emissions regulations that require an additional 80 per cent reduction in nitrogen oxides (NOx) compared to the current Stage IIIB/Tier 4 Interim standard.
The timing of the introduction of the new Deere Power Systems PowerTech PWS, PVS and PSS engines will vary by model and geography, but in general deliveries will begin to take place during the 2014 sales year for models larger than 174hp and will be extended to lower power classes through 2016.
To meet Stage IV emissions regulations in some power categories Deere has developed the Integrated Emissions Control system, an optimised after-treatment solution that will be paired with the company’s current engine platform that features proven cooled exhaust gas recirculation (EGR).
The Integrated Emissions Control system will typically consist of a diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system specifically designed to meet the rigorous demands of off-highway applications. John Deere will continue to tailor its Integrated Emissions Control System configurations to fit a variety of off-highway applications.
“At John Deere, we continue to offer the right combination of technologies at the right time to meet increasingly stringent emissions regulations and customer needs,” Deere Power Systems‘ John Piasecki said. “Exhaustive research and testing has determined that an application-specific SCR system that is well integrated with our proven Stage IIIB engine platform will be the best solution to achieve Stage IV emissions compliance while delivering the power, performance, ease of operation, fluid efficiency, reliability and economical operating cost that our customers expect from John Deere.”
Consisting of an exhaust filter and SCR after-treatment components that are optimised and fully integrated, the new Integrated Emissions Control system will allow John Deere engines to utilise less AdBlue than competiting Stage IV SCR technology solutions. Lower AdBlue consumption means the AdBlue tank size can be smaller, minimising the impact on vehicle applications. Monitored and controlled by proprietary electronics within John Deere’s enhanced engine control unit (ECU), the Integrated Emissions Control system also provides outstanding fluid efficiency without sacrificing overall performance.
Like John Deere’s approach to previous emissions changes, its Stage IV technology solution has been designed to consider overall performance and operating efficiency, which takes into account total fluid consumption including diesel fuel and additional fluids such as AdBlue. The engines will also operate efficiently with traditional ultra low-sulphur diesel as well as biodiesel blends from 5-20 per cent (B5-B20) blends, providing optimal performance and fuel choice flexibility.
John Deere is one of the few manufacturers dedicated to providing efficient power to meet the needs and rigours of off-highway applications. Designing engines for OEM applications and their own agricultural, construction and forestry machines provides John Deere with unique expertise in integrating the engine into the rest of the vehicle including the drivetrain, hydraulics, electronic control unit (ECU), cooling package and other vehicle systems for optimised efficiency.
For more information visit: www.johndeere.com/tier4.
