Exhaust after-treatment system with adjustable flow path, and method for operating such an exhaust after-treatment system

A method for operating an exhaust after-treatment system, the exhaust after-treatment system comprising a first set of exhaust after-treatment components, a second set of exhaust after-treatment components, the first set of exhaust after-treatment components comprising different types of exhaust after-treatment components than the second set of exhaust after-treatment components, an inlet to the exhaust after-treatment system, an outlet from the exhaust after-treatment system, and a valve and conduit arrangement configurable in a plurality of modes, comprising:

• configuring the valve and conduit arrangement in a first mode such that exhaust gas entering the inlet flows through the second set of exhaust after-treatment components, then through the first set of exhaust after-treatment components, and then through the outlet,
• configuring the valve and conduit arrangement in a second mode such that exhaust gas entering the inlet flows through the second set of exhaust after-treatment components without flowing through the first set of exhaust after-treatment components, and then through the outlet, and
• configuring the valve and conduit arrangement in a third mode wherein exhaust gas entering the inlet flows through the first set of exhaust after-treatment components, then through the second set of exhaust after-treatment components, and then through the outlet,
• wherein the exhaust after-treatment system comprises at least one sensor for detecting at least one operating condition, and a controller configured to receive a signal from the at least one sensor corresponding to the at least one operating condition, the method comprising
• automatically configuring, via the controller, the valve and conduit arrangement in the first mode when the at least one operating condition is in a first condition including that a temperature measured at the inlet is below a predetermined temperature, and
• automatically configuring, via the controller, the valve and conduit arrangement in the second mode when the at least one operating condition is in a second condition including that the temperature measured at the inlet is above the predetermined temperature.