JPH0263023U

JPH0263023U -

Info

Publication number: JPH0263023U
Application number: JP14123088U
Authority: JP
Priority date: 1988-10-31
Filing date: 1988-10-31
Publication date: 1990-05-11

Description

[Brief explanation of drawings]

第１図は実施例の全体構成図、第２図は従来例
の断面図、第３図は他の従来例の断面図である。５……ＥＣＵ、６，７，１０，１１……排気管
、８，９，１２，１３……触媒コンバータ、１４
，１５，１６，１７……Ｏ_２センサ、１０′，１
０″，１１′，１１″……排気管、２１……隔壁
、２２……開口、２４……連通管、２３，２５…
…Ｏ_２センサ。 FIG. 1 is a general configuration diagram of an embodiment, FIG. 2 is a sectional view of a conventional example, and FIG. 3 is a sectional view of another conventional example. 5... ECU, 6, 7, 10, 11... Exhaust pipe, 8, 9, 12, 13... Catalytic converter, 14
, 15, 16, 17... O ₂ sensor, 10', 1
0'', 11', 11''...Exhaust pipe, 21...Partition wall, 22...Opening, 24...Communication pipe, 23, 25...
... _O2 sensor.

Claims

[Scope of utility model registration request]

V with 4 cylinders in each bank on the left and right
In a type 8-cylinder engine, the exhaust ports of two cylinders whose explosion timings differ by 270 degrees for each bank are merged into one exhaust pipe, and each bank has two exhaust pipes, a total of four exhaust pipes. A dual exhaust system is constructed by further merging the exhaust pipes for each bank at a point where the exhaust pipes have a predetermined approximately equal length when viewed from the exhaust valve of each cylinder. By providing dedicated catalytic converters at points of substantially equal length as small as possible when viewed from the valve, and further providing dedicated _O2 sensors in each of the exhaust pipes upstream of the catalytic converters, the catalytic converters 1. An exhaust gas purification system for a V-type 8-cylinder engine, characterized in that it is configured to perform air-fuel ratio feedback control independently for each of the two consecutive cylinders.