Title:
EXHAUST PASSAGE STRUCTURE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2019167831
Kind Code:
A
Abstract:
To suppress the elongation of a warmup time of an exhaust emission purification catalyst at a cold time, in an exhaust passage structure of an internal combustion engine in which a rectification member is arranged in an exhaust passage at an upstream side rather than the exhaust emission purification catalyst.SOLUTION: In the exhaust passage structure of an internal combustion engine having a plurality of branch pipes, a collection pipe having an exhaust emission purification catalyst therein, and a rectification member arranged at the collection pipe at an upstream-side rather than the exhaust emission purification catalyst, the rectification member is formed of an annular porous plate material whose center portion is opened. Then, in each of the branch pipes, two curved parts are arranged which are formed so that most of the exhaust emission flowing out to the collection pipe from each branch part passes an opening part in the center portion of the rectification member when an exhaust emission flow rate is small, and on the other hand, when the exhaust emission flow rate is large, most of the exhaust emission flowing out to the collection pipe from the branch pipe collides with the porous plate material of the rectification member.SELECTED DRAWING: Figure 2
Inventors:
ITO HIROKAZU
YAMAUCHI TAKAYUKI
YAMAUCHI TAKAYUKI
Application Number:
JP2018054234A
Publication Date:
October 03, 2019
Filing Date:
March 22, 2018
Export Citation:
Assignee:
TOYOTA MOTOR CORP
SANGO CO LTD
SANGO CO LTD
International Classes:
F01N3/24; F01N13/10
Attorney, Agent or Firm:
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo
Hironobu Yazawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo
Hironobu Yazawa