CUMMINS QSB4.5 POWERS UP TO 173 HP FOR TIER 4 FINAL

 

For the QSB4.5 lower ratings down to 121 hp (90 kW), the VGT technology improves transient response on a fuel efficient basis. For equipment operation, this means a stronger, faster response to increasing load demands compared to Tier 4 Interim.The QSB4.5 will be a key focus of attention in the Cummins booth at World of Concrete, which is taking place February 5-8, 2013 in Las Vegas. The QSB4.5 will be shown ready for the EPA Tier 4 Final emission regulations taking effect Jan. 1, 2015 and EU Stage IV taking effect Oct. 1, 2014 for engines below 174 hp (130 kW).

 

The ability to move forward to meet near-zero Tier 4 Final emissions standards has been pre-designed into the existing QSB4.5 engine platform, retaining the same cooled Exhaust Gas Recirculation (EGR) system proven with the current Tier 4 Interim engine.The Cummins Compact Catalyst (CCC) aftertreatment is also retained, with the addition of Selective Catalytic Reduction (SCR) in the exhaust stream. The combined CCC-SCR aftertreatment is designed and manufactured by Cummins Emission Solutions, with the highest level of engine and system integration expertise in the industry.

 

The patented Variable Geometry Turbocharger utilized on the QSB4.5 is a smaller version of the VGT proven on Cummins 6-cylinder engines. The VGT features a unique, one-piece sliding-nozzle to precisely adjust the airflow delivered to the engine. This combines

 

the advantages of a small and large turbocharger in a single unit, so that rapid boost is provided at low engine rpm, and then high boost is maintained at higher rpm.

 

The QSB4.5 achieves 173 hp (129 kW) with a single turbocharger, in contrast to other 4-cylinder engines below 5-liters requiring two turbochargers to achieve equivalent power, torque and altitude capability.

 

Integrated Aftertreatment

To remove Particulate Matter (PM) from the exhaust, the Cummins Compact Catalyst (CCC) aftertreatment moves forward to Tier 4 Final with the same “fit and forget” advantage realized for Tier 4 Interim applications, with a smaller space claim than a Diesel Particulate Filter (DPF).

 

The very low Nitrogen Oxide (NOx) emissions levels required for Tier 4 Final are achieved by incorporating Cummins Selective Catalytic Reduction (SCR) aftertreatment in the exhaust stream, configured for compact 4-cylinder applications. The SCR uses a catalyst specified to deliver a robust solution, able to operate more efficiently at lower temperatures and features advanced sensors to provide full closed-loop control. Diesel Exhaust Fluid (DEF) dosing levels are minimized due to an enhanced mixing technique.

 

The CCC-SCR aftertreatment is available in multiple configurations including switchback,horizontal and vertical formats to provide an easier and more flexible installation.

 

Stronger Where It Counts

 

For Tier 4 Final, the QSB4.5 builds on the class-leading durability and uptime dependability established by the Tier 3 engine and continued by the current Tier 4 Interim engine. Deep structural strength equips the engine to handle high load factors with relaxed operation, while features such as a rear gear train provide superior stiffness and lower gear noise.

 

The High Pressure Common Rail (HPCR) fuel system and Electronic Control Module (ECM) of the 4-cylinder QSB4.5 are of the same design and offer robustness equal to that of the fuel system and ECM utilized on the 6-cylinder QSB6.7, capable of up to 300 hp (224 kW).

 

Broadest Ever 4-Cylinder Range

 

The QSB4.5, together with the recently announced QSF3.8 and QSF2.8, extend Cummins 4-cylinder engine            range to a broadest ever 49- to-173 hp (37-129 kW) capability for Tier 4 Final / Stage IV emissions standards. The three engine platforms offer an ideal step-up in displacement and incremental performance to provide equipment manufacturers with compact 4-cylinder power for machines such as skid steer loaders, telehandlers, compact excavators and loaders, forklifts, compactors and more.