Title:
内燃機関の排気浄化装置
Document Type and Number:
Japanese Patent JP7062986
Kind Code:
B2
Abstract:
To suppress the deterioration of fuel economy while purifying a nitrogen oxide (NOx) generated by a three-way catalyst, in a technology for purifying the exhaust emission of an internal combustion engine.SOLUTION: An exhaust emission control device of an internal combustion engine comprises: a particulate substance removal filter arranged in a main flow passage in which exhaust emission from the internal combustion engine circulates, and removing particulate substances in the exhaust emission; a three-way catalyst arranged at a downstream side rather than the particulate substance removal filter in the main flow passage; a NOx catalyst arranged in the main flow passage, and purifying a nitrogen oxide in the exhaust emission; and a control part. When the control part receives a signal for switching an in-cylinder air-fuel ratio to a stoichiometric air-fuel ratio from a lean air-fuel ratio from a combustion state control part for controlling the in-cylinder air-fuel ratio of the internal combustion engine to a lean state, a stoichiometric state and a rich state, the control part sets the in-cylinder air-fuel ratio which is controlled by the combustion state control part to a first air-fuel ratio which is shifted to a lean side rather than a stoichiometric side according to a state of the particulate substance removal filter.SELECTED DRAWING: Figure 4
Inventors:
Takato Ikedo
Kazuhisa Inagaki
Kazuhisa Inagaki
Application Number:
JP2018020140A
Publication Date:
May 09, 2022
Filing Date:
February 07, 2018
Export Citation:
Assignee:
Toyota Central R & D Labs.
International Classes:
F02D41/04; F01N3/023; F01N3/025; F01N3/035; F01N3/08; F01N3/24; F01N3/28
Domestic Patent References:
| JP2011530029A | ||||
| JP2017066971A | ||||
| JP2002276422A | ||||
| JP2003129835A | ||||
| JP2017150411A | ||||
| JP2014055565A |
Foreign References:
| WO2014013552A1 |
Attorney, Agent or Firm:
Junya Tanabe
Yukie Itakura
Yukie Itakura