Incorporated in the system is a fixed-geometry Holset turbocharger with integrated Rotary Turbine Control (RTC) and a Close Coupled Unit with a Selective Catalytic Reduction (SCR) catalyst.
The goal of the integrated system is to better manage heat and boost fuel economy.
The integrated RTC eliminates the need to inject fuel ahead of the aftertreatment system to heat it up and maximise its efficiency, a common practice with current solutions.
Instead, the RTC allows up to 50 to 60% of exhaust gases to bypass the turbine stage and enter the SCR unit, which is first injected with urea by Cummins’ new UL4 injector.
According to Cummins, the exhaust gases reaching the SCR aftertreatment unit are 70°C hotter than traditional setups as a result, which allows the catalyst to perform better than would be possible otherwise.