System and method for operating passive nitrogen oxide adsorber in exhaust aftertreatment system

• Main Authors: ORTH-FARRELL LISA A, YUAN YING, NARULA, MANIK, LUO JINYONG, HENRICHSEN, LARS, K, SCHMIDT DAVID, QIU LU, JIN XING, SONG XIAOBO
• Format: Patent
• Language: Chinese; English
• Published: 08.07.2022
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

A system includes a catalyst for receiving and processing exhaust gas produced by an engine, a passive NOx adsorber (PNA) upstream of the catalyst, a bypass valve upstream of the catalyst and the PNA, and a controller. The controller is configured to determine that the catalyst is operating under a cold start condition, control the bypass valve to direct exhaust gas to the PNA, determine that the catalyst is no longer operating under the cold start condition, and continue to control the bypass valve to direct exhaust gas to the PNA for a predetermined duration, and after the predetermined duration has elapsed, control the bypass valve to direct exhaust gas to the catalyst bypassing the PNA. The controller is further configured to detect a high transient torque demand while providing exhaust to the PNA and distribute the torque demand between the engine and the electric motor. 一种系统，包括用于接收和处理由发动机产生的排气的催化器、位于催化器上游的被动式NOx吸附器(PNA)、位于催化器和PNA上游的旁通阀以及控制器。控制器被配置为确定催化器在冷启动条件下操作，控制旁通阀将排气引导到PNA，确定催化器不再在冷启动条件下操作，并继续控制旁通阀将