Systems and methods for controlling regeneration of aftertreatment systems including multiple legs

A method for controlling regeneration of at least one of a SCR catalyst or a filter included in a first leg or a second leg of an aftertreatment system, the first leg structured to receive a first portion of an exhaust gas produced by an engine, and the second leg structured to receive a second portion of the exhaust gas, the method comprising:

• determining, by a controller coupled to each of the first leg and the second leg of the aftertreatment system, whether regeneration is permitted by the engine based on engine operating parameters;
• in response to determining, by the controller, that regeneration is permitted by the engine, determining, by the controller, whether regeneration is required in at least one of the first leg or the second leg based on operating parameters of the first leg and the second leg, and whether regeneration is inhibited in either the first leg or the second leg;
• in response to determining, by the controller, that (i) regeneration is required in at least one of the first leg or the second leg, and (ii) regeneration is not inhibited in either the first leg or the second leg, causing insertion of hydrocarbons, by the controller, into the engine to thereby increase a temperature of the exhaust gas to a target temperature and cause regeneration in each of the first leg and the second leg;
• monitoring, by the controller, a regeneration stage of each of the first leg and the second leg;
• and
• in response to each of the first leg and the second leg being at a regeneration stage that corresponds to a plateau stage or a regeneration stage that occurs before the plateau stage, setting, by the controller, the target temperature as the smaller of a first target temperature of exhaust gas flowing through the first leg and a second target temperature exhaust gas flowing through the second leg.