Method of regenerating lean NOx trap of exhaust purification system provided with lean NOx trap and selective catalytic reduction catalyst and exhaust purification system

• Main Authors: JOSCHKA SCHAUB, LEE, JIN HA, THOMAS WITTKA, PARK, JIN WOO, ALEXANDER VOVK
• Format: Patent
• Language: Chinese; English
• Published: 04.01.2017
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

A method of regenerating a lean NOx trap (LNT) of an exhaust purification system provided with the LNT and a selective catalytic reduction (SCR) catalyst may include: determining whether a regeneration release condition of the LNT is satisfied; determining whether a regeneration demand condition of the LNT is satisfied; and performing regeneration of the LNT if the regeneration release condition of the LNT and the regeneration demand condition of the LNT are satisfied. In particular, the regeneration demand condition of the LNT is satisfied if a NOx adsorption in the LNT is larger than or equal to a threshold NOx adsorption, and the threshold NOx adsorption is set to a minimum value of a target NOx adsorption in the LNT which changes according to a maximum NOx adsorption in the LNT in cold starting and a NOx purification efficiency of the SCR catalyst. 本申请公开了稀燃NOx捕集器的再生方法以及废气净化系统，种废气净化系统的稀燃NOx捕集器(LNT)的再生方法，该废气净化系统设置有LNT和选择性催化还原(SCR)催化器，该方法可包括：确定是否满足LNT的再生释放条件；确定是否满足LNT的再生需求条件；并且如果LNT的再生释放条件和LNT的再生需求条件都满足，则执行L