Exhaust gas treatment system having a solid ammonia gas producing material

An exhaust gas treatment system for an internal combustion engine, the internal combustion engine having a plurality of pistons and an engine off condition that indicates that the plurality of pistons are generally stationary, comprising:

• an exhaust gas conduit in fluid communication with, and configured to receive an exhaust gas from the internal combustion engine during operation;
• a pressurized vessel storing a solid ammonia gas producing material, the pressurized vessel selectively activated to heat the solid ammonia gas producing material into an ammonia gas, the ammonia gas being released into the exhaust gas conduit, the pressure vessel configured for internally attaining a threshold pressure;
• a pressure transducer that indicates pressure located internally of the pressure vessel;
• a SCR device in fluid communication with the exhaust gas conduit and configured to receive the ammonia gas, the SCR device having a SCR temperature profile and a SCR light-off temperature;
• an ignition switch that sends a signal that is indicative of the engine off condition;
• and
• a control module in communication with the internal combustion engine, the pressurized vessel, the pressure transducer, and the ignition switch, the control module including a memory for storing a value indicating a target amount of the ammonia gas released into the exhaust gas conduit by the pressurized vessel and loaded on the SCR device, the control module comprising:
• a control logic for monitoring the ignition switch for the signal, wherein the control module includes control logic for determining if the internal combustion engine is in the engine off condition based on the signal;
• a control logic for determining the SCR temperature profile;
• a control logic for determining if the SCR temperature profile is below a threshold value if the internal combustion engine is in the engine off condition, the threshold value indicating that the SCR device is a specified amount below the SCR light-off temperature;
• a control logic for determining if the pressurized vessel has released the target amount of the ammonia gas into the exhaust gas conduit if the SCR temperature profile is below the threshold value;
• a control logic for deactivating the pressurized vessel if the pressurized vessel has released the target amount of the ammonia gas;
• a control logic for monitoring the pressure transducer for pressure located internally of the pressure vessel;
• and
• a control logic for activating the pressurized vessel if the threshold pressure is attained, and if the pressurized vessel has not released the target amount of the ammonia gas into the exhaust gas conduit.