Patent ID: 8607553

Claim:
An exhaust system, comprising: a first treatment device configured to receive a flow of exhaust and convert a first constituent of the exhaust to a second constituent; a second treatment device located downstream of the first treatment device and configured to reduce the first constituent and the second constituent; a flow regulator configured to selectively vary a rate of exhaust passing through the first treatment device while maintaining a combination of a quantity of exhaust passing through the first treatment device and a quantity of reductant added to the exhaust equal to a quantity of exhaust passing through the second treatment device; a controller configured to operate the flow regulator such that a desired amount of the first constituent and the second constituent is received by the second treatment device; a turbocharger disposed upstream of the first treatment device; and an actuator connected to the turbocharger and configured to adjust a position of one of a vane and a nozzle ring of the turbocharger, wherein the flow regulator is configured to vary the rate of the exhaust passing through the first treatment device by affecting operation of the actuator.