公开(公告)号：US08893473B2

公开(公告)日：2014-11-25

申请号：US13768634

申请日：2013-02-15

Applicant: Denso Corporation

Inventor： Shingo Nakata ,  Mikiyasu Matsuoka ,  Hiroki Nogami

IPC: F01N3/00 ,  F02D41/14 ,  F01N9/00

CPC classification number: F01N9/00 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1476

Abstract: An emission control system for an engine includes an upstream sensor provided upstream of a catalyst in a flow direction of exhaust gas, a downstream sensor provided downstream of the catalyst to detect an air-fuel ratio so that the air-fuel ratio approaches a target air-fuel ratio in a sub feedback control, a constant current supply portion which changes an output characteristic of the downstream sensor by applying a constant current on a pair of electrodes thereof. A characteristic control portion controls the constant current supply portion in the sub feedback control to advance a timing of lean detection of the downstream sensor when the air-fuel ratio is richer than the target air-fuel ratio, and to advance a timing of rich detection of the downstream sensor when the air-fuel ratio is leaner than the target air-fuel ratio.

Abstract translation: 用于发动机的排放控制系统包括设置在排气流动方向上的催化剂上游的上游传感器，设置在催化剂下游的下游传感器，以检测空燃比使空燃比接近目标空气 - 反馈控制中的燃料比，恒定电流供应部分，其通过在其一对电极上施加恒定电流来改变下游传感器的输出特性。 当空燃比比目标空燃比更浓时，特征控制部分控制副反馈控制中的恒流供应部分，以提高下游传感器的稀薄检测时间，并且提前进行丰富检测的定时 当空燃比比目标空燃比更稀的时候，

公开(公告)号：US20130213016A1

公开(公告)日：2013-08-22

申请号：US13768634

申请日：2013-02-15

Applicant: DENSO CORPORATION

Inventor： Shingo NAKATA ,  Mikiyasu Matsuoka ,  Hiroki Nogami

IPC: F01N9/00

CPC classification number: F01N9/00 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1476

Abstract: An emission control system for an engine includes an upstream sensor provided upstream of a catalyst in a flow direction of exhaust gas, a downstream sensor provided downstream of the catalyst to detect an air-fuel ratio so that the air-fuel ratio approaches a target air-fuel ratio in a sub feedback control, a constant current supply portion which changes an output characteristic of the downstream sensor by applying a constant current on a pair of electrodes thereof. A characteristic control portion controls the constant current supply portion in the sub feedback control to advance a timing of lean detection of the downstream sensor when the air-fuel ratio is richer than the target air-fuel ratio, and to advance a timing of rich detection of the downstream sensor when the air-fuel ratio is leaner than the target air-fuel ratio.

Abstract translation: 用于发动机的排放控制系统包括设置在排气流动方向上的催化剂上游的上游传感器，设置在催化剂下游的下游传感器，以检测空燃比使空燃比接近目标空气 - 反馈控制中的燃料比，恒定电流供应部分，其通过在其一对电极上施加恒定电流来改变下游传感器的输出特性。 当空燃比比目标空燃比更浓时，特征控制部分控制副反馈控制中的恒流供应部分，以提高下游传感器的稀薄检测时间，并且提前进行丰富检测的定时 当空燃比比目标空燃比更稀的时候，