Abstract: A controller for use in an aftertreatment system that includes a doser configured to dose reductant into a decomposition chamber and a pump configured to supply the reductant to the doser is configured to be operatively coupled to the doser and the pump and programmed to cause the pump and the doser to operate in an idle mode in which the pump supplies the reductant from a reductant tank to the doser at steady state, the doser does not dose the reductant, and the reductant supplied to the doser by the pump is recirculated to the reductant tank. The controller is also programmed to, while the pump and the doser operate in the idle mode, determine a first speed of the pump required to achieve a predetermined target pressure. The controller is also programmed to cause the pump and the doser to operate in a dosing mode.

Abstract: A system, method, and apparatus for sensor tampering detection are provided. An aftertreatment system comprises a first leg comprising a first Selective Catalytic Reduction (SCR) system, a first doser, and a first NOx sensor, a second leg comprising a second SCR system, a second doser, and a second NOx sensor, and a controller. The controller determines satisfaction of enabling conditions. The controller doses reductant to the first and second SCR systems. The controller determines NOx values of the first SCR system and the second SCR system. The controller adjust the dosing of the first SCR system for a time period. The controller measures NOx values of the first SCR system and the second SCR system. The controller determines a difference between the third and first NOx values and a difference between the fourth and second NOx values. The controller generates an indication regarding whether the first NOx sensor is displaced.

Abstract: A controller for controlling regeneration in an aftertreatment system comprising a first leg and a second leg is configured to: determine whether regeneration is permitted by the engine based on engine operating parameters; in response to regeneration being permitted, determine 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; and in response to determining that (i) regeneration is required in at least one of the first or second leg, and (ii) regeneration is not inhibited in either the first or the second leg, cause insertion of hydrocarbons into the engine to thereby increase the temperature of the exhaust gas to a target temperature and cause regeneration in each of the first and second leg.

Abstract: A system, method, and apparatus for sensor tampering detection are provided. An aftertreatment system comprises a first leg comprising a first Selective Catalytic Reduction (SCR) system, a first doser, and a first NOx sensor, a second leg comprising a second SCR system, a second doser, and a second NOx sensor, and a controller. The controller determines satisfaction of enabling conditions. The controller doses reductant to the first and second SCR systems. The controller determines NOx values of the first SCR system and the second SCR system. The controller adjust the dosing of the first SCR system for a time period. The controller measures NOx values of the first SCR system and the second SCR system. The controller determines a difference between the third and first NOx values and a difference between the fourth and second NOx values. The controller generates an indication regarding whether the first NOx sensor is displaced.

Abstract: A controller for controlling regeneration in an aftertreatment system comprising a first leg and a second leg is configured to: determine whether regeneration is permitted by the engine based on engine operating parameters; in response to regeneration being permitted, determine 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; and in response to determining that (i) regeneration is required in at least one of the first or second leg, and (ii) regeneration is not inhibited in either the first or the second leg, cause insertion of hydrocarbons into the engine to thereby increase the temperature of the exhaust gas to a target temperature and cause regeneration in each of the first and second leg.

Abstract: A system for diagnosing and/or determining the performance of a reductant delivery system may include determining a flow rate offset value for the reductant delivery system. A reduced reductant flow rate may be determined for a reductant dosing command value based, at least in part, on the determined flow rate offset when reductant dosing command is non-zero. A reductant flow rate error can be determined based, at least in part, on a difference between an expected reductant flow rate value corresponding to the reductant dosing command value and the determined reduced reductant flow rate. A performance status value indicative of a performance status of the reductant delivery system may be outputted based, at least in part, on the determined first reductant flow rate error and a predetermined threshold.

Abstract: A system for diagnosing and/or determining the performance of a reductant delivery system may include determining a flow rate offset value for the reductant delivery system. A reduced reductant flow rate may be determined for a reductant dosing command value based, at least in part, on the determined flow rate offset when reductant dosing command is non-zero. A reductant flow rate error can be determined based, at least in part, on a difference between an expected reductant flow rate value corresponding to the reductant dosing command value and the determined reduced reductant flow rate. A performance status value indicative of a performance status of the reductant delivery system may be outputted based, at least in part, on the determined first reductant flow rate error and a predetermined threshold.