Valve arrangement for split-flow close-coupled catalyst

An aftertreatment system comprising:

• a first exhaust gas path comprising a first decomposition chamber configured to receive reductant and a first selective catalytic reduction catalyst downstream of the first decomposition chamber;
• a second exhaust gas path comprising a second decomposition chamber configured to receive the reductant and a second selective catalytic reduction catalyst downstream of the second decomposition chamber;
• a selector valve configured to divert exhaust gas between the first exhaust gas path and the second exhaust gas path based on a temperature of the exhaust gas;
• and
• a controller programmed to control the selector valve such that:
• the selector valve diverts at least a portion of the exhaust gas to the first exhaust gas path when the temperature of the exhaust gas is equal to or less than a predetermined temperature threshold;
• and
• the selector valve diverts the exhaust gas to the second exhaust gas path when the temperature of the exhaust gas is greater than the predetermined temperature threshold,
• wherein the first exhaust gas path comprises a heater configured to heat the exhaust gas received in the first exhaust gas path;
• wherein the first decomposition chamber is configured to receive the exhaust gas that has been diverted to the first exhaust gas path by the selector valve and heated by the heater;
• wherein the first selective catalytic reduction catalyst is configured to receive the reductant and the heated exhaust gas from the first decomposition chamber;
• wherein the second decomposition chamber is configured to receive the exhaust gas that has been diverted to the second exhaust gas path by the selector valve;
• and
• wherein the second selective catalytic reduction catalyst is configured to receive the reductant and the exhaust gas from the second decomposition chamber.