Abstract: An exhaust gas aftertreatment system includes an exhaust gas conduit a mixer, and a plurality of flow disrupters. The exhaust gas conduit is centered on a conduit center axis and includes an inner surface. The mixer includes a mixer body and an upstream vane plate. The upstream vane plate has a plurality of upstream vanes. At least one of the upstream vanes is coupled to the mixer body. The flow disrupters are disposed downstream of the mixer and circumferentially around the conduit center axis. Each of the flow disrupters is coupled to the exhaust gas conduit or integrally formed with the exhaust gas conduit. Each of the flow disrupters extends inwardly from the inner surface.

Abstract: A humidity compensation system for an internal combustion engine includes a humidity sensor sensing relative humidity of intake air, a temperature sensor sensing intake air temperature, a pressure sensor sensing intake air pressure and a control circuit computing a specific humidity (SH) value based on the sensor outputs. The control circuit is configured to compute one or more of an adjusted air-to-fuel ratio command as a function of SH and a default air-to-fuel ratio command, an adjusted ignition timing command as a function of SH, engine speed and a default ignition timing command and an adjusted boost pressure command as a function of SH and a default boost pressure command. The control circuit is operable to control any of fueling, ignition timing and boost pressure based on the corresponding adjusted air-to-fuel ratio, ignition timing and boost pressure commands to thereby compensate for humidity effects on engine operation.