公开(公告)号：US20190024556A1

公开(公告)日：2019-01-24

申请号：US16036081

申请日：2018-07-16

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yuki NOSE ,  Yoshihisa ODA ,  Kazuki TSURUOKA

IPC: F01N3/10 ,  F01N3/20 ,  F02D41/14 ,  F02D41/02 ,  F02P5/15

Abstract: When a request for temperature increase of a three-way catalyst is made, a CPU executes dither control in which one of a plurality of cylinders is set as a rich combustion cylinder with a richer air-fuel ratio than a stoichiometric air-fuel ratio and the remaining cylinders are set as lean combustion cylinders with a leaner air-fuel ratio than the stoichiometric air-fuel ratio. When not executing the dither control, the CPU learns a rich learning value that is a learning value of a degree of a rich imbalance based on an upstream-side air-fuel ratio. When the rich learning value is greater than or equal to a predetermined value, the CPU prohibits the dither control.

公开(公告)号：US20160076474A1

公开(公告)日：2016-03-17

申请号：US14785030

申请日：2014-03-28

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yuya YOSHIKAWA ,  Tokiji ITO ,  Isao NAKAJIMA ,  Hiroaki TSUJI ,  Toshihiro KATO ,  Yoshihisa ODA ,  Masashi HAKARIYA ,  Masahide OKADA ,  Yoshifumi MATSUDA

IPC: F02D41/14

CPC classification number: F02D41/1454 ,  F02D41/0085 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1495 ,  F02D41/2454 ,  F02D2041/1422

Abstract: An air-fuel ratio control apparatus for an internal combustion engine is provided. A controller is programmed to perform correction amount guard control allowing adjustment of a correction amount by setting a limit on the correction amount when an appearance frequency of a state where an output value from a downstream sensor is leaner than a predetermined value is equal to or higher than a predetermined value. When a state where the output value from the downstream sensor is leaner than the predetermined value lasts for a duration equal to or longer than a predetermined time, an incorporation speed at which, during learning control, the correction amount for sub feedback control is incorporated into a learning value is set to a larger value that when the duration is shorter than the predetermined time, and performance of the correction amount guard control is suppressed until the learning control is completed.

Abstract translation: 提供一种用于内燃机的空燃比控制装置。 控制器被编程为执行校正量保护控制，允许当来自下游传感器的输出值比预定值更稀的状态的出现频率等于或更高时，通过设置校正量的限制来调整校正量 超过预定值。 当来自下游传感器的输出值比预定值更精细的状态持续等于或长于预定时间的持续时间时，在学习控制期间将用于副反馈控制的校正量并入的并入速度 将学习值设定为较大的值，即当持续时间短于预定时间时，校正量保护控制的执行被抑制直到学习控制完成。