Patent ID: 9617883
Date: 2017-04-11
CPC Classifications: F01N,Y02T

Claim:
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 NO 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 NO 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.