A system includes a passive NOx adsorber (PNA) for receiving and treating exhaust gas generated by an engine and a controller. The controller is configured to: while exhaust gas is received by the PNA, detect a torque demand that is greater than a threshold value; responsive to detecting that the torque demand is greater than the threshold value, engage a motor, coupled with a battery system, with a drive shaft of the system to meet at least a portion of the torque demand; and in response to the engagement of the motor with the drive shaft not meeting all of the torque demand, engage the engine with the drive shaft to meet a remainder of the torque demand.

Embodiments described herein methods can be used in particulate filter regeneration, such as particulate filters used for filtering the exhaust of an engine, e.g., a diesel engine. Systems herein can be configured to dispense combustion gas(es) into housing were a particulate filter is contained and to ignite the combustion gases. Methods for conducting a safety verification process of such systems are disclosed, as well as methods for regenerating the filters. Still other embodiments are described.

A work vehicle having an engine that generates exhaust gases flowing through an exhaust flow path to an exhaust vent includes a nitrogen-oxide (NOx) reduction device, a particulate filter, a temperature sensor sensing a temperature associated with the exhaust gases, and a plurality of flow control devices in the exhaust flow path between the engine and the exhaust vent. The plurality of flow control devices are operable to define a first flow path when the sensed temperature is less than a predetermined temperature threshold and a second flow path otherwise. The NOx reduction device is upstream of the particulate filter relative to the exhaust flow path in the first flow path and the particulate filter is upstream of the NOx reduction device relative to the exhaust flow path in the second flow path.