Cylinder Deactivation as an Effective Means for Exhaust Thermal Management and CO2 Reduction - Test Results on a U.S. 13L HDDE

Cylinder Deactivation (CDA) was evaluated on a 2018 Navistar A26 engine. This is a 13L in-line 6-cylinder engine that was tested with an aftertreatment system comprised of a diesel particulate filter (DPF), urea doser, selective catalyst filter (SCR), and an ammonia catalyst. Several CDA calibrations were evaluated and compared to the baseline engine without CDA. Both Cold and Hot Federal Test Procedure (FTP) were first examined, and then several other test cycles common to the U.S. were measured. Lastly, the new Low Load Cycle test developed for the California Air Resource Board (CARB) and was subsequently adopted in August 2020 as part of its HD Omnibus Low NOx rules, which was tested along with several of its individual constituents. The results of the test show Brake Specific Fuel Consumption (BSFC) and after-treatment temperature improvements in all test cycles while also providing significant NOx reductions, especially in the lowest load and cycle work segments.