Method for Thermal Control of Exhaust Aftertreatment

摘要

There is disclosed a method of regenerating at least one aftertreatment device in an exhaust system of an internal combustion engine by changing a calibration of the exhaust gas recirculation system with the engine to increase temperature of exhaust gas provided to the at least one aftertreatment device, and further incrementally changing the calibration to obtain an exhaust gas temperature within a target regeneration temperature range.

主权项

1. A method of regenerating at least one aftertreatment device in an exhaust system of an internal combustion engine including an exhaust gas recirculation system, the method comprising:
determining if regeneration of the at least one aftertreatment device is needed; changing a calibration of the exhaust gas recirculation system with the engine to increase temperature of exhaust gas provided to the at least one aftertreatment device; determining if the temperature of the exhaust gas provided to the aftertreatment device is above a regeneration target temperature;
if the temperature of the exhaust gas provided to the aftertreatment device is above the regeneration target temperature, determining if a target regeneration has occurred after a regeneration period;
if the target regeneration has occurred, then ending regeneration;if the target regeneration has not occurred, then determining if the calibration of the exhaust gas recirculation system with the engine is at a maximum level;
if the calibration of the exhaust gas recirculation system with the engine is not at the maximum level, then incrementally changing the exhaust gas recirculation system with the engine to increase the temperature of the exhaust gas provided to the at least one aftertreatment device until such time as the target regeneration occurred or the calibration of the exhaust gas recirculation system with the engine is at the maximum level;if the temperature of the exhaust gas provided to the aftertreatment device is not above the regeneration target temperature, then determining if the calibration of the exhaust gas recirculation system with the engine is at the maximum level;
if the calibration of the exhaust gas recirculation system with the engine is not at the maximum level, then incrementally changing the exhaust gas recirculation system with the engine to increase the temperature of the exhaust gas provided to the at least one aftertreatment device until such time as the temperature of the exhaust gas provided to the aftertreatment device is above the regeneration target temperature and target regeneration has occurred, or until the calibration of the exhaust gas recirculation system with the engine is at the maximum level.