DE1946338A1 - Post-combustion device for the exhaust gases from internal combustion engines - Google Patents

Description

Dipl.-Ing. W. PAAP 8 MONKS 22, DipL.ln «. H. MITSCHERUCH ϊϊ " Dipl.-Ing. K. GUNSCHMANN Dr. rer. not. W. KÖRBER September 12, 1969 PATENT LAWYERS

HONDA GIKEN KOGYO KABUSHIKI KAISHA

(English: Honda Motor Co., ltd.)

5, 5-chome Yaesu, Chuo-ku, lokyo, Japan

Patent application

Secondary combustion device for the exhaust gases of internal combustion engines

The invention relates to near-combustion devices for the exhaust gases from internal combustion engines.

An afterburning device is already known in which the exhaust gases of an internal combustion engine in a post-combustion chamber are introduced to be subjected to a renewed combustion, so that the not yet burned components the exhaust gases are eliminated. With this construction, the post-combustion chamber usually has such a large volume » that it does not offer any resistance to the flow of exhaust gases when the engine is operating at high power, and therefore no decrease the engine power. However, when the post-combustion chamber has a large volume, it is when the engine is started or when operating at low power, it is difficult to keep the interior of the chamber at a high temperature and

desired to achieve near-burning effect. In addition, the A relatively large amount of fuel is supplied to the engine when it is started, in order to ensure that it starts safely, so that the exhaust gases contain large quantities of uncombusted components. Therefore, when it comes to tempering, it is particularly undesirable that the post-combustion chamber remains ineffective.

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According to the invention, a near-combustion device is now intended be created, which does not adhere to the aforementioned disadvantages, and which is characterized in that the various cylinders of an internal combustion engine are connected to a silencer via a line arrangement, • which includes the various exhaust pipes, in each of the · a associated valve is switched on, and that parallel to this Line arrangement, a second line arrangement is provided which has an afterburning chamber that is jointly assigned to the cylinders and a bypass line connected thereto. _; . Here, the valves mentioned are usually with the throttle valve of the engine connected by a linkage so that the valves are closed when the throttle valve is relatively is little open, but that the valves are open when that Throttle valve is relatively wide open. The mentioned Valves are usually a single, all of the exhaust pipes jointly assigned valve combined, but it is also possible to provide each exhaust pipe with a separate valve.

According to a further feature of the invention, at least one of the exhaust pipes serves as the aforesaid, the post-combustion chamber with the silencer connecting bypass line, so that the device according to the invention of simple construction and takes up little space. You can only do this through this achieve that you don't have at least one of the exhaust pipes provides a valve of the type mentioned. ·

In this embodiment, in which at least one of the Exhaust pipes are not provided with a special valve, this exhaust pipe can be opened at the time of opening of the associated ^ Exhaust valve come into effect in almost the same way like the other exhaust pipes, but when the exhaust valve closes this line acts as a bypass line connecting the afterburning chamber * with the silencer. It is therefore not necessary to remove one of the exhaust pipes g.e-

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separate bypass line to be provided, so that the construction simplified and the device takes up little space.

The invention and advantageous details of the invention are illustrated below with the aid of schematic drawings of exemplary embodiments explained in more detail.

Fig. 1 shows schematically an embodiment of the invention.

Figure 2 is an enlarged section through the post-combustion chamber the arrangement according to FIG. 1.

FIG. 3 is a section along the line III-III in FIG. 2.

Fig. 4 shows schematically a modification of the embodiment according to Figs. 1 to 3. '

Fig. 5 is a schematic illustration of another Embodiment of the invention.

FIGS. 6 and 7 schematically show two further embodiments of the invention.

In Fig. 1 to 3 _t show an embodiment of the invention, one recognizes an internal combustion engine 1 with several cylinders, "for example the cylinders 2, 3» 4 and 5 · The exhaust pipes connected to the cylinders 2, 3, 4 and 5 or -stubs 6, 7, 8 and 9 are connected to one another at their outer ends and combined to form a single common exhaust pipe 10, the other end of which is connected to a silencer 12, so that between the engine 1 and the silencer 12 a first the elements - 6, 7, 8, 9, 10 and 11 comprehensive line arrangement A is present .. The exhaust pipes 6 to 9 are provided near their inner ends with small lateral openings 13, H, 15 and 16, which in a single jointly assigned to the exhaust pipes Post-combustion chamber 17 open out ton relatively small volume, which is connected to the muffler 12 by a bypass line 18, so that a second line arrangement B is present between the engine 1 and the muffler 12

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BADORIGINAU

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j is the one via the openings 15 to 16, the chamber 17 and the Line 18 is connected in parallel with the first line arrangement A. The bypass line 18 is close to its inner end with a small opening on the side to connect the line to the Connect chamber au. The valve 11 is provided with a throttle valve 20 of the motor 1 connected by "a rod 21 so that the valve 11 is closed when the throttle valve 20 during operation ' of the engine is relatively little opened with low power is that the valve 11, however, when the engine is running at high Power is open when the throttle valve 20 is relatively wide open.

According to FIGS. 2 and 3, the exhaust lines 6 to 9 and the bypass line 18 arranged so that it passes through the Afterburning chamber 17 extend therethrough, the mechanical strength of which can therefore be increased, and the small openings 13 to 16 are arranged in a Ziofeaek pattern to mutual Interference is possible to reduce; the outer wall 23 of the Chamber 17 consists of an upper and a lower half together, which are detachably connected to one another by screws 24 to the renewal of the heat-insulating enclosed by the wall 23 Materials 25 to facilitate.

The execution form according to Fig. 1 to 3 works as follows: If the valve 11 is opened, the first line arrangement A is open. Therefore, the exhaust gases of the engine 1 are mainly through the line arrangement A is fed to the muffler 12. Therefore even then, the chamber 17 does not provide any resistance to the exhaust gas flows if their volume is relatively small. When the valve 11 is closed, this first line arrangement also becomes A closed. Now the exhaust gases from engine 1 are the muffler 12 Supplied via the second line arrangement B encompassing the post-combustion chamber 17. Therefore they are still . subject unburned components of the exhaust gases to a cleaning treatment in the chamber.

In this device according to the invention you can with the help of the valve 11, the first or the second line ■ ·

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ORIGINAL

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Select anprdimng A or B. If 2.B. the engine of a motor vehicle Or the like. Is operated with high performance, which in practice occurs relatively pages, and the content of the . Emissions of unburned components is so low that one can practically neglect it, is the first line arrangement A used to discharge the exhaust gases? here remains the Post-combustion chamber 17 ineffective. Thus, even in the case of an afterburning chamber, it has a relatively small seam volume possible to avoid the disadvantage that the chamber creates a flow resistance and therefore causes a reduction in engine power, against it is used when starting the engine or in low power operation where the exhaust gases contain large amounts of unburned components, the second Line arrangement B, so that the post-combustion chamber comes into effect. Since the post-combustion chamber is a relatively has a small volume, it can be operated in a predetermined manner with certainty.

One can modify the embodiment according to Fig. 1 to 3 so that that the embodiment shown in Fig. 4 is obtained. While in, the embodiment according to Pig. 1 to 3 a single valve is assigned to all exhaust lines 6 to 9 in common, shows Pig. 4 shows an embodiment in which several valves 11a to 11d are provided, of which one is assigned to each exhaust line is. It can be seen that see the arrangement according to Pig. 4 can be operated almost in the same way as that according to Pig. 1 to 3.

According to another feature of the invention, one can click on dispense with the use of the bypass line 18 required in the exemplary embodiments described so far, so that one a simpler construction with a small footprint is obtained. Such an arrangement is in Pig. 5 shown. According to Pig. 5 - you can choose any exhaust pipe, e.g. the furthest one line 9 on the right and valve 11 the rest Map exhaust lines 6, 7 and 8, so that the selected line 9 the task of the bypass line 18 of that described above Embodiments takes over.

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The Pig embodiment. 5 works as follows: Will ' the valve 11 is opened, the exhaust gases from all cylinders 2 to 5 dem .; Silencer 12 via the associated exhaust pipes 6 to 9 supplied, so that the Nachverbr burnkanmier 17 opposes the exhaust gas streams no resistance} here works the The selected exhaust line 9 not connected to the valve 11 is similar to the other lines 6 to 8. If the valve 11 closed, the exhaust gases flow out of each of the cylinders 2, 3 and 4 through the associated small openings 13, 14 and 15 into the Chamber 17 to be burned again, whereupon they dem Silencer 12 via the not connected to the valve 11 line 9 is supplied.

Instead of the single valve 11 according to the embodiment Pig. 5, according to Pig. 6 also three valves 11a, 11b and 11c and according to Pig. 7 provide two valves 11a and 11b.

Expectations;

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Claims (5)

AHSPE Ü Q HE 1. J Haohverbrenntmgsvorrichtung for the exhaust gases of a combustion Ttttngtaotors, characterized) that the various cylinders (2,3 »4t5) of an internal combustion engine (1) are connected to a silencer (12) via a first line arrangement (A)» which the associated exhaust lines (6,7,8,9), in which one or more valves (11; 11a to Ud) are switched on, and that a second line arrangement (B) is connected in parallel with the first line arrangement, which has a single post-combustion chamber (17 ) and a bypass line (18) connected to it. 2. Apparatus according to claim 1 *, characterized in that the valve arrangement is a single, all exhaust lines (6,7ι 8,9) includes a jointly assigned valve (11). 3. Apparatus according to claim 2, characterized in that the valve arrangement comprises a plurality of valves (11a to 1Id) of one assigned to each exhaust line (6,7,8,9) iet. 4 · Device according to claim 1, characterized in that di valve arrangement (11; 11a to 11d) and a throttle valve (20) de »Motors (1) are connected by a rod in such a way that that the valve or valves are closed »when the throttle valve is relatively little open, but are open, when the throttle valve is relatively wide open. 5. Apparatus according to claim 1, characterized in that at least one selected from the exhaust pipes (6,7,8,9) * Exhaust line (9) is not provided with a valve (11), so that this exhaust line at the same time the bypass line (18) between the combustion chamber (17) and the muffler (12) forms. The / patent attorney 009836/1762