JPS5999021A - O2-sensor attaching structure for v-type multi-cylinder engine - Google Patents

Abstract

PURPOSE:To accomplish prompt activation of an O2-sensor in a longitudinal V-type engine having a catalyst in a muffler, by disposing a right and a left pipes in an exhaust chamber in which a front and a rear exhaust pipes are opened, in the manner that they are located on the opposite sides of an O2-sensor disposed in said exhaust chamber. CONSTITUTION:In a structure for inserting and connecting front exhaust pipes 14a, 14b and rear exhaust pipes 16a, 16b connected respectively to two front cylinders and two rear cylinders of a longitudinal V-type four-cylinder engine to front and upper portions of an exhaust chamber 15, an O2-sensor 17 is attached substantially to the center of the chamber 15 in the direction of its width. In more detail, the sensor 17 is fixed to the chamber 15 from above at the positions thereof located slightly rearwards of the portions where the rear exhaust pipes 16a, 16b are fixed. Further, sub-pipes (connecting tubes) 18a, 18b are disposed in the exhaust chamber 15 in the manner that they are located on the opposite sides of a monitoring top 17a of the O2-sensor 17. Here, one open ends of the pipes 18a, 18b are located at positions facing the monitoring top 17a of the sensor 17 while the other open ends of the pipes 18a, 18b are located near the open ends of the exhaust pipes 14a, 14b, 16a, 16b.

Description

[Detailed description of the invention]

In a V-type engine equipped with a catalyst in the exhaust thread muffler, it supplies the secondary air necessary for exhaust purification to the old man.
This relates to the mounting structure of the 02 sensor, which is used as a signal source for secondary air control. When a catalyst device is installed as a main body in the exhaust line of a motorcycle, etc. for the purpose of exhaust purification, an appropriate amount of exhaust gas V] supplied to the catalyst device is used to promote the reaction. Next, it is necessary to supply air, but especially when using 39 tactile as a catalyst, the oxidation reaction and the reduction reaction can occur simultaneously at the 6 / (Lance point (Konron air fuel ratio)) of the gas component. Therefore, in order to promote the oxidation reaction of CO and CH and the reduction reaction of NO, accurate control of air combustion is required. Since the total fuel ratio can be measured incorrectly, VC is due to the exhaust gas temperature) f! ii degree is necessary, and in multi-cylinder engines, 0 degree is required for each cylinder.
It is necessary to install two sensors. X From i + 14 Ha This kind of point vc - I invented it, so what is its purpose and location? What is the exhaust pipe of each cylinder of a multi-cylinder engine? A conduit pipe is arranged in the exhaust chamber connected to "i:", and the exhaust gas from each exhaust pipe is connected to the exhaust gas 7i:02 sensor VC+.
By introducing the effective VC, the activation of the 02 sensor is accelerated, thereby making it possible to detect the exhaust gas condition of each exhaust gas with one α]02 sensor. Hereinafter, an embodiment of the invention shown in FIGS. 1 to 9 will be described. 1 is self; the same motorcycle ■ 1θ) 61 to the frame 2, so σ) The head tube 3 is fixed to the front end g
i, and M m 5 'i in the same herad tube 3
The supporting front fork 4 is pivoted to the steering wheel. A handle 7 is disposed on a top bridge 6 disposed at the upper end of the front fork 4α. As shown in the second pXJ, the frame 2 is slightly tilted backwards and downwards from the upper part of the head tube 3 and extends backward from the main vibe 2a and the lower force of the head tube 3. The subtube 2b1 is connected to the middle part of the main vibe 2a with a loin extending from the subtube 2b, and the downtube 20% is suspended from the subtube 2b. □2□ Down tube lower 2d, same down tube lower 2d
The center tube 2es is connected to the rear end of the main vibe 2a, and the center tube 2es extends rearward from the rear end of the main vibe 2a. It's karatsubo Furugiwa, deru. And the down tube 2c, the down tube lower Z
ds center tube 2e, etc. 4, left and right two parallelly installed g
i. A cross vibe 2h is installed horizontally between the lower ends of the down tube 2c. Further, a fuel tank 8 is mounted on the main vibe 2a of the frame 20, a seat 9 is arranged behind the fuel tank 8σ), and a center tube 2e and a sub-stay 2 are arranged on the rear side.
The lower 'n'il VC of g is merged with a sub-plate 10 made of approximately inverted Japanese cedar, and supports a temporary ring 12 for the same sub-plate.
The front end of the rear fork 11 is pivoted. Above main vibe 2 a % down tube 2 c
% down tube lower 2d1 surrounded by center tube 2e! The engine 13 is arranged in the space l'r+. The engine 13 has a V-type front and rear, and is mounted with a crank shaft.
] It is a multi-cylinder type engine, and the front cylinder 13a has two cylinders on the left and right, and the rear cylinder 13b has two cylinders on the left and right, for a total of four cylinders. A part protrudes into the front, the rear cylinder 13'b stands up and tilts slightly backward, and the cylinder 13a%13
A V-shaped space is formed between b and vc 1lt and 1 plane. The front and rear cylinders 13a and 13b are stiff, and the cylinder block 13d is bent over the crankcase 13c.
It consists of cylinder head 13e, cylinder head cover 1.3f, and crankcase 1.
3 c #Active Is has a Mitsuyeon case 417E. The left and right exhaust ports 13g of the left and right front cylinders 13a are the down tube 2c O').The left and right exhaust ports 13g are approximately L.The left and right exhaust ports 13g are approximately L. Qiken 14as14b follows 1, same left and right 1
1 (side exhaust pipe 14 a % 14 b ■) section faces the previous issue of down tube 2c, continues from the lower end of down tube 20 to down tube lower 2d η, follows the filter shape and bends backwards T11, roughly Extends backward from the same curved part.
, the down tube lower 2 (1 (/,) downward) is inserted, and is in communication with the front cap s of the exhaust chamber 15 disposed below the center tube 7' 2e. 10,000 left and right rear cylinders 13b (1) left and right υ1 air ports 1
3h is opened rearward, and the front ends of the left and right rear exhaust pipes 16a and 16b are bent in a reverse shape to the left and right exhaust ports 13h, and the front ends of the left and right rear exhaust pipes 16as16bl/)
The lower end is inserted and connected from the upper part of the exhaust chamber 15,
Exhaust from the front and rear cylinders 13as13b is carried out through the exhaust chamber 15.
As soon as we gathered, it was getting late. The exhaust chasoba 15 is shown in the 3rd to 41st lines (11e) having a rear wall surface and a predetermined volume space with a predetermined length in the width direction. The left and right rear exhaust pipes 14a and 14b are inserted from the front part of the exhaust chamber 15. Also, the left and right rear exhaust pipes 16a and 16b are inserted from the upper part of the gas chamber 15. Exhaust chamber 1
5, the left rear ligament %V 16 a extends to the vicinity of the right front exhaust pipe 14 b, the right front exhaust pipe 16
b is extended to the vicinity of the left front exhaust pipe 14a, and is extended to intersect the left and right rear exhaust pipes 16as16bc: in the exhaust chamber 15. As a result, left and right rear exhaust pipes 1
6 a. 16b is designed to allow sufficient exhaust pipe length. Roughly the left and right rear exhaust pipes 16 in the exhaust 1 chamber 15
The 02 sensor 17 is attached from above at the approximate center of the as16b (=slightly behind the J part and the same exhaust chamber 15θ)%, i,000 times. FIII 0
A sub-vibrator 1.8a% 1.8b is fixed to the left and right sides of the detection part 17a of the two sensors 17 by a hook 19, and is disposed inside the exhaust chamber 15. The ends of the eyes of 10,000 (')i7iJ are spaced apart from each other by 1151 distances from the Tt detection unit 17a. and each sub-vibrator 18a, ], 8
b! It is bent toward the four mouth ends of the front exhaust pipe 14 and the rear exhaust pipe 16, and the left sub-vibrator 18 aσ)
The other open end is behind the left front exhaust pipe 14a and the right side exhaust pipe 16b (1) [Wrolgnl at a predetermined distance from the J mouth end, right sub-vibe 18bθ] The other open end is behind the right front exhaust pipe 14 b and the left rear exhaust pipe 16a.The left and right muffler joint vibes 20a are installed at the rear end of the exhaust chamber 15. %21Jb is inserted, and the same left and right muffler joint vibe 20a%
The open end of 20b is 18a%18b
It extends to the vicinity. Said muffler joint vibe 20a% 20b
There are left and right mufflers 21. a % 21 b is continued one time each, and the same left and right muffler 21 a % 21
A three-way catalyst 22 is installed inside the Megugija of b. ”! 'l' @ Front and rear cylinders 13 a -, 13 b
lf? l K is the air cleaner 23 installed in the air cleaner case 23 a and the inner Hg.
Consisting of an air cleaner, an air cleaner, a method door 3b, etc.
The clean side in element 23b is marked 1, cylinder 13a-i13bσ]Fuel supply table M24 is II
j The sowing is interrupted. :ffl Mr,, below the air cleaner O, the lower end of the down tube 2C and the down tube lower 2dσ) ui
A Gt 11-door valve surface 5 is disposed between the ends of f, and an upstream chamber 25c is formed in the same door valve device 2 that communicates with the secondary ψ% inlet 25b into the box 25a. The left and right sides of box 5a are forces, and the basic force is 1711 at bar 25d.
At the same cover 25d (If h';, the upstream chamber 50
A reed valve 26 is interposed between and the above-mentioned Shimosaka Tomi 5Cα]. No. 6R4 has only one side cut out, but the other side is constructed in the same way 5, and the left and right covers 25dvC are secondary wall temperature outlet 5.
f) are provided respectively. The reed valve 26c is made up of a flexible member 7J), and only the sink 1 from the upstream chamber 25c to the downstream 2!5e can be connected to the reed valve 26c. The reed valve device 25 is connected to the cross vibe 2 h [MW
However, the same reed valve device 50 (previous issue and the following issue) is attached to the mounting stay 27 vC, and is protected from foreign stones. Slightly below the air cleaner 2, there is a secondary air control valve 4) installed, and the secondary air control valve 4 is equipped with a device 29.
is connected to the air cleaner c via tube 3o,
T1. The communication vibrator 31 is connected to the inlet port δb of the reed valve device via the tube 32. As shown in Figure 7, the secondary air control valve is in communication with the communication chamber 33 into which clean air is introduced via the communication vibrator 29 which is in communication with the air cleaner 23. A positive pressure chamber 34, separated from the positive pressure chamber 34 by the diaphragm 35K, a negative pressure chamber 36, a control valve 37 separated from the VC, and a communication chamber 38 divided into opening/closing marks. Connection to ;'58
The positive pressure chamber 39 is in communication with the positive pressure chamber 39, and the positive pressure chamber 39 and the diaphragm 40 are used to separate the positive pressure chamber 39 into a negative pressure chamber. The diaphragm 35 is equipped with a deceleration air force valve 42.
Air cut valve 42 and continuous chestnut chamber 33σ) +I1.1
A compression coil spring 43 is interposed between the prefectures,
The air cut valve 42 is always energized to open. - The diaphragm 40 has a control valve 37 on its front, and the same control valve 3
7 and the side wall of the communication chamber 38 is a compression coil spring 44.
Power) G2 old, control valve 37 G-
11-E i4 Communication via coil spring 44 ¥33
and the communication to 38 are closed off. Further, the negative pressure chamber 36 is disconnected from the intake pipe downstream of the throttle valve 66 via the vibrator 45, and L[-E￥414:t
Connected to solenoid valve 48 via vibrator 46.47
Q'2 The solenoid valve 48 is composed of a blocking valve 49, a return spring 50, a solenoid 51, etc., the upper communication pipe 52 is connected to the intake pipe 54 via the check valve 53, and the lower communication vibe 55 is connected to the intake pipe 54 through the check valve 53. Secondary air control valve 2 via 56
8 is connected to the pipe 57. Note that the vibrator 574 is in communication with the communication chamber 38. Also, the excitation circuit 586 of the solenoid 51 is closed at a predetermined rotational speed or higher, and the make contact 59 of the Qf stone vehicle speed sensor increases 1'.
The signal from the 02 sensor 17 is transferred to the same amplifier 6(]U(-
Make contact 61 of the 02 sensor, amplify it and open/close it.
Increase 1i11. J device 60 A contact built into P' is made up of a 1" RO start + 111 timer claw, 62 and an on-vehicle batch 11-63, which are closed at a predetermined time for the starting radial radius. However, after a predetermined time after starting the tower gate, the start timer σ)
The meter contact 62 is closed and the engine speed (power) FI
When the rotation speed exceeds the T constant speed, the meter contact 59 of the vehicle speed sensor
is closed and the exhaust gas concentration is low @ (lean), 1 - that is, θ) in the exhaust gas) When the air-fuel ratio is larger than the predetermined value @@, the 02 sensor θ) make contact 61 is close to closing and the solenoid 51 It's exciting, so it's like

【ing. rtiii period soleme solenoid 51il + magnetic giwa, roto,
The closing valve 110 is suctioned from the solenoid 51 VC],
1-1 crash:)) 3 σ) Air is introduced into the negative pressure chamber 41 via the lower communication vibrator 55, etc., and the same negative pressure chamber 41
The inner V becomes the same pressure as the inside of the positive pressure chamber 39, and the diaphragm 40
Lt Ll': &t A positive pressure chamber 38 +1111 is created by the biasing force of the coil spring 44, and the control valve 37 is closed υ and V 7'1. /! ,,. As a result, the communication chamber 33 and the communication chamber 38 and v)l 1lji
Rikitsuki 1J [Tawa, reed valve device 6 from air cleaner 23
If the exhaust gas concentration is rich, the air-fuel ratio is smaller than the predetermined value. In this case, the make contact 61 of the 02 sensor is open, the solenoid 51 is in a de-energized state, and the closing valve 49 is closed to the return spring 50.
The intake pipe 54 downstream of the throttle valve 66 and the negative pressure chamber 4 are in communication with each other via the upper communication nozzle 52 and the like, and the diaphragm 40 moves toward the reconnaissance chamber 41 side. The control valve 37 opens against the compression coil spring 44 and communicates with the front chamber 33.
38 is in communication, and air is supplied from the air cleaner 23 to the reed valve device station. During rough engine deceleration, throttle valve 66 lower IJ1
The pressure inside the intake pipe 54 of P9r becomes roughly lower than the constant pressure of P9r, and the intake pipe 54 under the throttle valve 66 becomes a positive pressure of
When the difference between the pressure in the stone-reducing chamber 36 and σ) becomes larger than the pressure at which the rice coil spring 430 is installed, the die r flam 356f operates toward the negative side, and the air cut lever 42 closes. . The communication between the communication chambers 33 and 61 and the double chamber 38 is cut off, and the air supply from the air cleaner n to the reed valve 25 is cut off. As shown in FIG. 5, the above 11
M Valve system It 25 K Open secondary air outlet 25f
is the secondary air supply pipe 65 via the joint tube 64.
The connection to the front end straddle 1s 65a of the secondary air supply tube 65 was broken.
The rear end of the 65b is the left and right front exhaust pipe 14a% 14
It is connected near the rear end of b. Tightly press the right mouth i [
Wanyui 1st match '14a. Due to the exhaust pulsation of 14b, the inside of the secondary air outlet 65 becomes positive and negative pressure alternately, and when the pressure is negative, it acts on the reed valve 26 through the pipe line 64, 65, opens the reed valve 26, and drains the upstream chamber. Purified air using the air cleaner 23 is sucked in from 25c, and secondary air is introduced into the exhaust system from downstream of the exhaust pipe 14. The actual cases shown in Figures 11 to 9) T16 are eye i[
Since the configuration is broken as described, the front and rear springs 13a
The exhaust gas from 113b is collected in the exhaust chamber 15 via the exhaust pipe 14.1.6.
How much more exhaust gas is coming out from the left sub tube 18a?
Introduced into the detection part 17a of the 02 sensor 17 through k, the front right exhaust pipe 14b and the left rear exhaust pipe 16a.
The filtered exhaust gas is introduced into the detection unit 17a of the O2 sensor]7 through the right subtube 18b, and the exhaust gas from each % house is constantly introduced to the sensor 17 in a short time. Power) 1], Ru0kori) and each person IJ? /da's combustion order 6, exhaust pipe 16a, 11 rings,
J:ll m pipe 14 a Vc slave connection C, tan IJ terminal, cylinder disconnected from exhaust pipe 161), and exhaust pipe 14 b K neckline 7'1. The order of the cylinder cylinder becomes Vζ and the old rJ % exhaust W 14 a VC is discarded and the exhaust pipe 16 The cylinder which is disconnected from b tube 16
Continuing from 4 to a, the former 5 tangent 1 is in the order of force ≦ continuous combustion, and the high-temperature exhaust force 6: is continuously discharged from exhaust air 14 a, υl, and trachea 16 b. Exhaust gas 1 is continuously sent from the left fiber tube 18a to the n1 sensor 17 from the exhaust pipe 14b and the exhaust pipe 16a.
．． The filtered product temperature exhaust gas is sent from the right subtube 18 b to the 02 sensor 17 VC feed r, ro. And by 02 Zunser J7, each Qi @1θ〕positive u+(
+ Fuel specific power) Measurement value 1, Air fuel specific power) Predetermined value Pi
If the VC is small, the air is supplied from the air cleaner 23 via the secondary air control valve 28 to the air cleaner 251/C.
Due to the exhaust pulsation of the front exhaust pipes 14a and 14b, the reed valve 26 opens when the pressure is negative via the secondary air supply pipe 65 facing the downstream part of the front exhaust pipes 1.4a, 14bU).
Purified air is sucked in from 5c to bring the air-fuel ratio in the exhaust chamber 15 close to a predetermined value. Roughly, the exhaust chamber 15 internal VC is controlled to a predetermined air-fuel ratio near the exhaust 1 gust size, three-dimensional tfm K 2
2, and is discharged through the muffler 21. In addition, if the air-fuel ratio of the exhaust gas detected by the 0□ sensor 17 is greater than a predetermined value or Omason, the control valve 37 in the secondary air control valve 28 is closed, and the air cleaner The supply of σ) purification device to the reed valve device 5 was 1i. small. 1 - that is, the exhaust chamber <15 secondary air force) supply], without exception 1. Exhaust 1 gas σ〕air-fuel ratio)
The predetermined value has 1 penalty and 1 old, and 1 promotes purification. Ru. When decelerating -r (6), secondary air control valve "Air cut at 28VC" (4)
2 is blockage FE Tl-, reed valve from air cleaner O
The supply of σ) purified air to A W 25 is cut off, and the supply of α) secondary air to the exhaust chamber '15 is blocked. The action of the three-way catalyst 22Q shows the purification characteristics as shown in No. 91-, where the horizontal axis represents VLC total gas excess excavation and the vertical axis represents the purification rate C%. C01HO, No.: should be purified at the same time near the air-fuel ratio (excess air ratio is 1). 5) 02 sensor 17σ) Set the predetermined air-fuel ratio to 4344 stoichiometric fuel-fuel ratio (air excess J grass is 1), thereby increasing efficiency and purifying power). reactor. 110,000 Exhaust Pipe 1
4 a %1.4 b and posterior cytotrachea 16a, 16
〢σ) Left and right sub-vibrators facing the open end], 8as1
8b is arranged, the same left and right sub-vibrator 18a%
18 b The exhaust gas of each cylinder can be guided to the sensor 17 from the VC, and the air-fuel ratio of the exhaust gas of all cylinders can be detected accurately and quickly. However, one 602 sensor 17 reads 1゛11, and it is only necessary to add Safhive 18, so it can be made into one female song. In the E x example, the exhaust gas sent to the 02 sensor 17vc was taken from the previous exhaust pipe 14 and the rear exhaust pipe 16σ) outlet, so the exhaust gas temperature was maintained at 4i, which was sufficient to create the 0□ sensor 17. You should be able to check the correct air-fuel ratio for 91J. Therefore, the reliability of the secondary air supply system is the same as above, and the actual quality of the exhaust gas is also lower.
In the li example, the 02 sensor 17 is connected to the exhaust chamber 1
Since the wiring 711) from the 02 sensor 17 is routed inside the strain body, it is less likely to be damaged by external force. In the embodiments shown in FIGS. 1 to 91-1, the secondary air 1 is introduced only into the front exhaust pipe, but the secondary air 1 is also introduced into the rear exhaust pipe. i: May be introduced. In the present invention, in the front and rear V plastic exhaust system equipped with 1QlIIs in the exhaust system muffler, the previous exhaust pipe and the rear exhaust bone are connected to the υto air channel, respectively, and the bleed air channel scoop vc J'C , Place the attached 02 sensor on the left and right sides, and connect the left and right ducts to the left and right side. Connect the other open end to each outlet of the previous exhaust pipe and the rear exhaust pipe, and insert a conduction pipe to send each volume of high-temperature exhaust gas to the 0□ sensor. 71) Please speed up the activation of 02 sensor C and one 02
The sensor can detect exhaust gas from all cylinders.

[Brief explanation of drawings]

FIG. 1 is a side view of a motorcycle using a V-type multi-cylinder θ〕02 sensor mounting structure θ) according to an embodiment of the present invention;
The figure is an enlarged side view of the main part, Figure 3 is the longitudinal section of the exhaust chamber in the same embodiment, and Figure 4 is its longitudinal section IHI.
I [j Iyl, Figure 5 is a bottom view of the same embodiment.
, t'JjI'+ lv eyes same 1. (-, lln
Partial omission of lead dog 1λ refutation in example i rfja 1
11J1a, Fig. 71 61 Identical to Example 1111 Secondary air control valve σ) Enlarged main part ηI6E Section 111U ttri figure, Cell 81 is the same example U) Rust, brief explanation 1st 1, Fig. 9 is This is the explanation 1 sentence 1 showing the relationship between the fuel ratio and the purification rate σ in the same example. ■... Own WU 2@'Jf, 2... Frame, 3
...Head tube X4...Front fork, 5.
...M wheel, 6...Top bridge, 7...Handle, 8...Fuel tank, 9...N-1-110...
Sub plate, 11... Rear fork, 12... Rear wheel, 13... Cylinder, 14... Exhaust pipe, 15...
・Exhaust chamber, 16... Exhaust pipe, 17... O2 sensor, 18... Saf high, 19... Locking msi
, 20... Muffler joint vibe, 21... Muffler, 22... Three-way JIB (%, 23... Air cleaner, 24... Fuel supply cutting, 5... IJ-do valve M
W, 26...Reed valve, 27...Stay, separate
・Secondary air control valve, 29...71L
j7 pipe, 30... tube, 31... communication vibe, 32... tube, 33... communication chamber, 34...
・Positive pressure chamber, 35...diaphragm, 36...lf"
4.37...Control valve, 38...Trace i1
j ”4.39...Positive pressure chamber, lIO...Diaphragm, old...i<t +-1, a-<, /12...
Air cut valve, 43, /14...11:, ft
t coil spring, 45.46...vibrator, 47.
...Tube, /I8... Solenoid valve, 49.
...Closing group -e, 50...Return spring, 51
... Solenoid, 52... Dobe communication vibe, 53.
... Check pal? -154...Intake pipe, 55...
Lower communicating vibe, 56...chu 7', 57...vibrator, 58...bJJ? 6A circuit, 59...-
g7 sensor make contact, 60...amplifier, 61.
...02 sensor 1g] make contact, (2...start timer meter contact, 63...onboard battery, 64
...Joint tube, 65...Secondary air supply
call, bb...throttle valve. Agent Nozomi Ehara, a lawyer, and one other person were abused in the third and fourth incident.

Claims (1)

[Claims] In a front and rear V-type engine equipped with a catalyst in the exhaust system muffler, the Iffff trachea and the rear exhaust pipe are connected to an exhaust chamber, and the 02 sensor installed in the exhaust chamber is sandwiched. At the same time, the 10,000 open ends of the left and right conductive pipes were connected to the 02 sensor, and the other open end was directed to each outlet of the front exhaust pipe and the rear exhaust pipe. ■Type Takishi engine σ〕02 setter mounting structure. /