Method for controlling an exhaust flow in an exhaust aftertreatment system (EATS) of a vehicle
AssigneeVolvo Truck Corporation
InventorsIrman Svraka, Åsa Högström
Life of this patent
Estimating the term…
Abstract
A method for controlling exhaust flow in an EATS of a vehicle. A NOx sensor output parameter is monitored. It is determined that the NOx sensor output parameter is below a limit. When the NOx sensor output parameter is below the limit, it is determined that a first part of the exhaust flow should bypass at least a first area of the SCR unit and that a second part of the exhaust flow should be inputted to at least the first area of the SCR unit. It is initiated that the first part is bypassed and that the second part is inputted to at least the first area of the SCR unit. An amount of reductant that should be added to the second part of the exhaust flow is determined. Addition of the amount of reductant is initiated.
Claims15
A method for controlling an exhaust flow in an Exhaust Aftertreatment System (EATS) of a vehicle, wherein the EATS comprises a NOx sensor and a Selective Catalytic Reduction (SCR) unit, the method comprising:
- monitoring a NOx sensor output parameter from the NOx sensor;
- determining if the NOx sensor output parameter is below a limit;
- when it has been determined that the NOx sensor output parameter is below the limit, determining that a first part of the exhaust flow should bypass at least a first area of the SCR unit and that a second part of the exhaust flow should be inputted to at least the first area of the SCR unit, wherein the first part and the second part are rejoined and wherein the NOx sensor is located at a point after the first part and the second part of the exhaust flow are rejoined;
- initiating that the first part of the exhaust flow is bypassed at least the first area of the SCR unit and that the second part of the exhaust flow is inputted to at least the first area of the SCR unit;
- when it has been determined that the first part of the exhaust flow should bypass at least the first area of the SCR unit and that the second part of the exhaust flow should be inputted to at least the first area of the SCR unit, determining that reductant should be added to the second part of the exhaust flow before being inputted to at least the first area of the SCR unit;
- and
- initiating addition of the reductant into the second part of the exhaust flow.
Dependencies are inferred from the claim text.