Multi-leg aftertreatment system

摘要

An apparatus is disclosed, including an exhaust conditions module structured to interpret a diesel particulate filter (DPF) delta pressure value, a flow balance correlation, a NOx input value, and an exhaust flow rate value. A flow determination module is structured to determine a flow imbalance value in response to the DPF delta pressure value, the flow balance correlation, and the exhaust flow rate value. A reductant determination module is structured to determine a first reductant injection command and a second reductant injection command in response to the flow imbalance value and the NOx input value.

主权项

1. An apparatus, comprising:
a controller configured to receive operating parameters from at least one sensor associated with an engine exhaust system, the engine exhaust system including a diesel particulate filter (DPF) leg with a DPF and a first reductant catalyst and a bypass leg that bypasses the DPF, the bypass leg including a second reductant catalyst, wherein the controller is configured to: receive and interpret a DPF delta pressure value, a flow balance correlation, a NOx input value, and an exhaust flow rate value associated with the engine exhaust system; determine a flow imbalance value in response to the DPF delta pressure value, the flow balance correlation, and the exhaust flow rate value; determine a first reductant injection command and a second reductant injection command in response to the flow imbalance value and the NOx input value; and provide the first reductant injection command for injection of reductant upstream of the first reductant catalyst and provide the second reductant command for injection of reductant upstream of the second reductant catalyst.