John Deere was one of the first engine manufacturers to take advantage of cooled exhaust gas recirculation (EGR) and variable geometry turbocharger (VGT) technologies in off-highway applications. Our accumulated know-how in this field has been invested in the development of our Stage III B PowerTech engine platform. As a result, we have been able to further refine many details, including further improvement of fuel efficiency as well as optimization of key performance characteristics, such as cold-weather starting, transient response time, power bulge, peak torque, and low-speed torque.
To meet emissions regulations, our Stage III B PowerTech engine also implements an exhaust filter that contains a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF).
Stage III B PowerTech engine technology
The John Deere Stage III B PowerTech engine platform features cooled exhaust gas recirculation (EGR) for NOx control, and an advanced DOC + DPF exhaust filter for reducing particulates.
VGT: Variable Geometry Turbocharger
The John Deere VGT tailors the amount of recirculated exhaust gas mixing with the incoming fresh air. Precise electronic controls open or close the variable vanes in the turbocharger, depending on engine load and speed. The optimised airflow generates more boost, while maximising low-speed torque, peak torque, and fuel economy.View VGT animation HPCR: High Pressure CommonRail
The high Pressure CommonRail fuel system provides constant control over fuel injection variables such as pressure, timing and duration. HPCR ensure instant response to varying load conditions while improving low-speed torque. View HPCR animation EGR: Cooled Exhaust Gas Recirculation
EGR cools and mixes measured amounts of cooled exhaust gas with incoming fresh air to lower peak combustion temperatures and reduce nitrogen oxides (NOx).View EGR animation DOC + DPF: Diesel Oxidation Catalyst + Diesel Particulate Filter
Under normal operating conditions, the DOC reacts with exhaust gases to reduce carbon monoxide, hydrocarbons, and some particulate matter. The downstream DPF then forces exhaust gases to flow through porous channel walls, trapping and holding the remaining particulate matter. Trapped matter is later oxidized within the DPF through a self-activating cleaning process, called passive regeneration, that uses exhaust heat produced during normal operating conditions. View DOC+DPF animation