JPH0419642U

JPH0419642U -

Info

Publication number: JPH0419642U
Application number: JP6063890U
Authority: JP
Priority date: 1990-06-11
Filing date: 1990-06-11
Publication date: 1992-02-19

Description

[Brief explanation of the drawing]

第１図は本考案に係る１つの実施例を示す図、
第２図はデユアルパラレルインレツトコーンに対
する空燃比センサの取り付けの態様を示す図、第
３図はデユアルクロスインレツトコーンに対する
空燃比センサの取り付けの態様を示す図、第４図
および第５図は２つの三元触媒を使用する排気系
に本考案を適用した実施例を示す図、第６図は従
来の三元触媒および空燃比センサの配置を示す図
、第７図はデユアルパラレルインレツトコーンを
採用した三元触媒中の排気ガスの流れを示す図、
第８図は第７図の各部の空燃比を示すグラフ、で
ある。図において、２０……内燃機関、２２，２４…
…シリンダバンク、３６……制御回路、４０，４
２……排気マニホールド、４４，４６……排気管
、４８……デユアルパラレルインレツトコーン、
５０……三元触媒、５２……アウトレツトコーン
、５４，５６……空燃比センサ、６０……始動用
三元触媒、６２……主三元触媒。 FIG. 1 is a diagram showing one embodiment of the present invention;
Fig. 2 shows how the air-fuel ratio sensor is attached to the dual parallel inlet cone, Fig. 3 shows how the air-fuel ratio sensor is attached to the dual cross inlet cone, and Figs. 4 and 5 show how the air-fuel ratio sensor is attached to the dual cross inlet cone. A diagram showing an example in which the present invention is applied to an exhaust system that uses two three-way catalysts. Figure 6 shows the arrangement of a conventional three-way catalyst and air-fuel ratio sensor. Figure 7 shows a dual-parallel inlet cone. A diagram showing the flow of exhaust gas in a three-way catalyst that uses
FIG. 8 is a graph showing the air-fuel ratio of each part in FIG. 7. In the figure, 20... internal combustion engine, 22, 24...
...Cylinder bank, 36...Control circuit, 40,4
2... Exhaust manifold, 44, 46... Exhaust pipe, 48... Dual parallel inlet cone,
50... Three-way catalyst, 52... Outlet cone, 54, 56... Air-fuel ratio sensor, 60... Three-way catalyst for starting, 62... Main three-way catalyst.

Claims

[Claims for Utility Model Registration] A first exhaust pipe connected to the first cylinder bank of an internal combustion engine having a first cylinder bank and a second cylinder bank, and a first exhaust pipe connected to the second cylinder bank. A two-line exhaust system consisting of a second exhaust pipe, and a dual parallel inlet cone or dual cross inlet in which the first exhaust pipe and the second exhaust pipe of the two-line exhaust system are connected together. In an exhaust gas purification device for an internal combustion engine comprising a three-way catalyst having a cone, the first outlet cone of the three-way catalyst
a first air-fuel ratio sensor is disposed at a position where the air-fuel ratio of exhaust gas discharged from the cylinder bank of the three-way catalyst can be detected;
a second air-fuel ratio sensor is disposed at a position where the air-fuel ratio of exhaust gas discharged from the cylinder bank of the internal combustion engine can be detected; and an air-fuel ratio control device for controlling the air-fuel ratio of the second cylinder bank of the internal combustion engine based on the output of the second air-fuel ratio sensor. Purification device.