Patent ID: 11898483
Assignee: CUMMINS INC.
Field: Chemical engineering (Chemistry)
Classification: CPC F  B  Y | IPC B  F

Claim 7:
8. A method for operating passive nitrogen oxide adsorbers (PNA) in an exhaust aftertreatment system, the method comprising:
determining that an effectiveness of a catalyst in reducing NOx is below a threshold level, the catalyst for receiving and treating exhaust gas generated by an engine;
in response to determining that the effectiveness of the catalyst in reducing NOx is below the threshold level, controlling a bypass valve to direct exhaust gas to the PNA, the PNA positioned upstream of the catalyst and fluidly coupled with the catalyst and the bypass valve positioned upstream of the catalyst and the PNA;
subsequent to controlling the bypass valve to direct exhaust gas to the PNA, determining that the effectiveness of the catalyst is no longer below the threshold level; and
in response to determining that the effectiveness of the catalyst is no longer below the threshold level:
continuing to control the bypass valve to direct exhaust gas to the PNA;
while continuing to control the bypass valve to direct exhaust gas to the PNA, increasing a load on the engine, wherein the load on the engine is increased by mechanically engaging a generator with the engine and utilizing resulting electrical energy generated by the generator to charge a battery system; and
after PNA regeneration conditions are met, controlling the bypass valve to direct exhaust gas to the catalyst bypassing the PNA.