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

Claim 0:
1. A system, comprising:
a catalyst for receiving and treating exhaust gas generated by an engine;
a passive NOx adsorber (PNA) positioned upstream of the catalyst and fluidly coupled with the catalyst;
a bypass valve positioned upstream of the catalyst and the PNA; and
a controller configured to:
determine that an effectiveness of the catalyst in reducing NOx is below a threshold level,
in response to determining that the effectiveness of the catalyst in reducing NOx is below the threshold level, control the bypass valve to direct exhaust gas to the PNA,
subsequent to controlling the bypass valve to direct exhaust gas to the PNA, determine 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:
continue to control the bypass valve to direct exhaust gas to the PNA for a predetermined duration and increase a load on the engine by mechanically engaging a generator with the engine, and utilize resulting electrical energy generated by the generator to charge a battery system; and
after PNA regeneration conditions are met upon an elapse of the predetermined duration, control the bypass valve to direct exhaust gas to the catalyst bypassing the PNA.