DE2235596A1 - EXHAUST ARRANGEMENT IN COMBUSTION ENGINES FOR MOTOR VEHICLES - Google Patents

Description

Exhaust arrangement in combustion engines for vehicles

The invention relates to an exhaust arrangement in combustion engines for motor vehicles with an exhaust combustion reactor, through which the exhaust gases of the internal combustion engine. directed and air supply means through which air is supplied to the reactor can be fed, so that a combustion of combustible components of the exhaust gases takes place.

When the air supply means comprising a YerbrennungslEraft ⁱ machine driven by DER; Pump can contain, so arranged., ■ That they supply air to the exhaust combustion reactor with a flow rate which is directly / proportional to the speed of the motor drive shaft, then it has been shown that the overall reduction of the proportion of the air pollutants contained in the exhaust gases Ingredients that are achieved by "overburning combustible constituents in the reactor" during normal operation of the internal combustion engine are not as large as · -.

209885/0985

Postehechkonto Essen 47247 · Comrnerzbank AG -DOsseldprf, Deposit kasse Hauptbahnhof

after examining the mode of operation of the exhaust assembly under steady-state conditions would have been expected.

The invention is based on the problem of the proportion of air pollutants in the normal Operation of an exhaust arrangement of an internal combustion engine of the type mentioned occurs to reduce further

According to the invention, this object is achieved in an exhaust arrangement of the type mentioned in the introduction, that the air supply means are arranged to supply air to the exhaust combustion reactor at a rate which is a function of both the load on the motor drive shaft as well as the speed of the motor drive shaft, sj that when accelerating the Vehicle air is supplied in a larger flow rate than when working in a stationary state.

Preferably the air supply means includes one of the internal combustion engine driven pump through which air can be supplied in a mass flow, which is proportional to the speed of the motor drive shaft, and means by which part of the pump output is deflectable from the exhaust combustion reactor, the arrangement being such that during a Acceleration of the vehicle, the entire output of the pump is fed to the exhaust combustion reactor and in other modes of operation of the vehicle, some of the pump output from the exhaust combustion reactor is distracted. The air deflection means may include a valve through which a portion of the

209885/0985

Pump discharge into the atmosphere can be deduced. Preferably is the valve according to the divider of the internal combustion engine prevailing pressure state can be actuated. The valve is thus made to measure. would be actuated by the load on the liotor drive shaft. The valve can a common servo valve be

The exhaust arrangement according to the invention can contain a pump driven by the internal combustion engine, which is able to deliver air at an outlet in a quantity flow proportional to the speed of the engine drive shaft, and a main air supply; fuel flow, which connects the outlet of the pump with the exhaust, puff combustion reactor. It.-can then be provided a valve member, which 'between two. Positions is movable, namely a position in which at least part of the pump output is diverted from the main supply line, so that the volume flow of the air supplied to the exhaust combustion reactor is always less than the volume flow ^; the air that the pump can deliver and one on. their position, with the entire unthrottled pump output being fed to the exhaust combustion reactor when the valve member is in the other position. The position of the valve member can; ¹ can be governed by conditions that affect the load on the motor drive shaft. = /

In one embodiment of the invention, the Ven-V acts member with a. Vent in "said main air supply line together, which is open when the valve member in said one Position so that at least some of the in · the

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Main air supply line air flowing through the vent leaks into the atmosphere, and which is closed when the valve is in said other position "is located.

In a second embodiment of the invention there is one parallel to the main air supply line Short-circuit line, which contains flow restricting means. The arrangement is such that the entire discharge of the pump is routed via the short-circuit line, when the valve member is in said one position and the valve member in this one Position prevents a connection between the pump outlet and said part of the main air supply line and that the entire pump output through this part of the main air supply line is directed when the valve member is in said other Position is, and the valve member in this other position a connection between the Pump outlet and the short-circuit line prevented

In both exemplary embodiments, the valve member can be attached to the movable wall of a chamber be which is biased by elastic means so that they the valve member in said hold another position · The chamber can be connected to the intake manifold of the internal combustion engine are in communication via a vacuum line, so that the movable wall by the Inlet manifolds, suction loads exerted thereon, are movable against the action of the elastic means is.

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Alternatively, in "both exemplary embodiments of the invention", the valve member can be mechanically connected to the throttle linkage of the internal combustion engine. Another possibility is that the position of the valve member in the second embodiment of electrical control means is determined * which on address the load aji of the motor drive shaft.

Two embodiments of the invention are described below with reference to the associated drawing explained in more detail r.;

Pig »1 is a schematic representation of an embodiment of an exhaust arrangement for internal combustion engines according to the invention. ; ■ _ \

, ·. Pig. 2 is a representation of another sche.matische Aüsführungsform an exhaust, ^anordnuhg: in an internal combustion engine according to the invention.

In Fig. 1 of the drawings, an electric vehicle has an internal combustion engine 10 which has an inlet manifold .1.1 through which a mixture of fuel and air during operation of the engine. Reasonable carburetor 10 (not shown) by, ■ is sucked, a rotating drive shaft 12, through / which the output si ei at ung the machine ^-il; 0 'via the usual (not shown), physical clutch, a (not shown) transmission to the (not shown) wheels of the vehicle, and a

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Exhaust assembly _β The exhaust assembly includes an exhaust pipe 13 through which exhaust gases from the engine

10 are discharged into the atmosphere, an exhaust combustion reactor 14 in the exhaust line and an air pump 15 »which is driven by the drive shaft 12 via a suitable, power transmission shown schematically at 16 is driven. The output of the pump 15 protrudes a line 17 with the exhaust combustion reactor H in connection. The air supply through the pump 15 to the exhaust combustion reactor I4 is controlled by a valve device 20 controlled

The valve device 20 includes a valve housing 21, which is divided into two chambers 22 and 23 by a rolling membrane 24 made of flexible material. the Chamber 22 is in communication with the inlet manifold

11 of the internal combustion engine 10 via a line 25, which ends in a connection provided on the valve housing 21. The front wall of the chamber 23 opposite the rolling diaphragm 24 forms an annular valve seat .- .: 7. The central breakthrough 28 of the annular valve seat 27 is in communication with the main air supply line I7, which from the outlet of the internal combustion engine driven pump 15 to the exhaust combustion reactor 14 extends. The interior of the chamber 23 ' is in communication with the atmosphere via an opening 29 in the wall of the valve housing 21. A valve member 30 is attached to the end of a valve tappet 31 facing away from the rolling diaphragm 24, The other end of the valve tappet 31 is attached to the rolling diaphragm 24. The valve member 30 has a frustoconical portion 32, which with the

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The annular valve seat 27 cooperates and closes the opening 28. A helical compression spring 33 within the chamber 22 presses the rolling diaphragm 24 onto the annular valve seat 27 so that the valve member 50 is in contact Mrdv ^ as valve housing 21 has a perforated transverse wall 34 * within which the valve tappet 51 slides and which extends transversely to the valve housing 21 between the opening 29 and the Hollmembran 24 · ^ : (■ L ■ ;; -. "; ■ '. ⁼ .;

In operation of the exhaust system iBt ^ when the load-the ^ ': ■ ;, spring 33 exceeds the load on the rolling diaphragm 24 as a result of the negative pressure from the inlet manifold 11 of the combustion engine 10, the breakthrough 28 closed -C. by contact of the valve member 30 against the annular valve seat 27 * This condition occurs when the pressure in the inlet manifold 11 has reached its highest level, so that the suction effect exerted on the rolling diaphragm is lowest EaIl, when the load on the motor drive shaft 12 is highest. The pressure in the inlet manifold 11 is lower for lower loads on the motor drive shaft 12, so that the suction force on the rolling diaphragm 24 counteracting the spring loading of the helical spring 33 is greater . If the suction force exerted on the rolling diaphragm ^ 24 übersehreitet the _Vr ^ of the spring 33 arising load, the valve member is abgehoberL 30 of the annular valve seat 27, so that Iiuf t tzuführleitung from the Hauptluf 17 to the reactor 14 "with the Opening 28, the chamber 2g and the outlet opening 29 ab-C: through which the latter the ■ · .- ■ "V

209885 / 098b

Air is released into the atmosphere. The flow rate The air with which the main air supply line 17 is discharged into the atmosphere depends on the Cross-sectional area of the annular gap between the frustoconical part 32 of the valve member 30 and the annular valve seat 27, and is thus dependent on the extent to which the on the EoIlmembran 24 from the inlet manifold 11 acting suction the spring load of the helical spring 33 exceeds.

In Figure 2 of the drawings, there is another motor vehicle an internal combustion engine 25, which has an intake manifold 36, a drive shaft 37 and a Having exhaust assembly. The exhaust assembly includes an exhaust pipe 38, an exhaust combustion reactor 39 in the exhaust pipe 38 and an air pump 40, which is driven by the rotating drive shaft 37 is driven. The air pump 40 is connected to the exhaust combustion reactor via a valve device 4I 39 in connection.

The valve device 4I includes a valve housing 42 having an inlet port 43, a main outlet port 44 and an auxiliary outlet port 45. The auxiliary exhaust port 45 is at one end of a short-circuit line 46 in which a flow-restricting Device 47 is arranged. The end of the short-circuit line 46 facing the inlet opening 43 forms an annular valve seat 48. The axis of the annular valve seat 48 is perpendicular to the axis of the openings 43, 44, 45,

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A main line 49 extends between the inlet opening 43 and the main outlet opening 44; Bie main line 49 has a central part 50 'is coaxial with the valve seat 48' - and is perpendicular to the two end portions of the main line 49, which in the inlet port 43 ^and: the Hauptausiaßöffnuhg .44 .. end. The end of the part 50 of the central main line closer to the inlet opening 43 forms an annular valve seat 55 which is coaxial with the annular valve seat 48. A valve member '52 can be moved back and forth between the two annular valve seats 48 and 51. That _; Valve-.- ■■■ member 52 sits at the end of a valve tappet 53, which is coaxial with the annular valve seats48- and 51 and extends through a "wall of the part, the" short-circuit line 46, which extends parallel to the end parts the main line 49. The end of the plunger 53 facing away from the valve member 52 is fastened to a membrane 54 made of flexible material which separates one chamber 55 from another chamber 56 which is formed in the valve housing 42. The chamber ' 56, which is closer to the valve member 52 than the chambers 55, is in communication with the inlet manifold 46 of the internal combustion engine 35 via a vacuum line 57. The interior of the chamber 55 is in communication with the atmosphere via a ventilation opening 58. Its helical compression spring 59 within the chamber 56 acts on the flexible membrane 54 and is supported on the wall of the chamber 55 opposite the membrane 54 so that the valve member 52 rests against the annular ring shaped valve seat 48 holds.

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The inlet opening 53 is connected via a line to the outlet of the pump 40 driven by the internal combustion engine, and the two outlet openings 44 and 45 are connected to a common line 60 which is connected to the exhaust combustion reactor 59. The effect of the negative pressure acting on the flexible membrane 54 similar to that described above with reference to the example shown in Fig. 1 and 2, ₀ It is to be understood that the valve member 52 abuts the annular valve seat 48 when the suction exerted on the flexible membrane 54 from the inlet manifold 36 is insufficient to overcome the load on the helical spring 59. Then the entire output of the pump 40 driven by the internal combustion engine, which is proportional to the speed of the motor drive shaft 37, is conducted via the main line 49 to the reactor To bring valve member 52 to Aufsitζ on the annular valve seat 51, the entire ejection of the pump 40, which is fed to the reactor 39, is passed through the short-circuit line 46 and the flow restrictor 47, so that the flow of air that is fed to the reactor 39 , is less than was the case when the pump output was directed via the main line 49 to the reactor 39 _o

It is desirable to use the exhaust assembly To provide means through which the air supply to the reactor with fully throttled operation of the

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Engine is shut off * to protect the reactor from excessive to protect against thermal stress. The use of such air barrier agents is common and does not form a * NEN PART OF THE PRESENT INVENTION ^ ^ form part of the: usual; i

In the exhaust arrangement described above with reference to the accompanying drawings, the valve device, which -./ determines whether> the amount of air flowing through the pump to the / reactor to any; . Timepunjfet is supplied, the same or less, ·. than the flow rate of air, the pump soft at this time, supply could be controlled by the suction from the inlet manifold _o -In a abgewanäelten ■ Äusführungsform the can top "■ the / trains impaired drawings exhaust assembly described with reference to / of the valve plunger 31 or-53 mechanically ver with the JDrosselgestänge via a suitable linkage * ^-; be prevented, so that the position of the valve member i 32 or 52 from the state of the throttle linkage / and thus of the load ah of Tlotorantrlebsyrelle ν ■ is determined In another modified training. According to the embodiment described above with reference to Fig. 2, the position of the valve member 52 can be controlled by an electrical control device which responds to the load on the motor drive shaft:, _: ■ /; /./ ".;,; / ..

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Claims (1)

_ ₁₂ _ Claims Exhaust arrangement in internal combustion engines for Motor vehicles with an exhaust combustion reactor through which the exhaust gases of the internal combustion engine are passed, and air supply means, through which air can be supplied to the reactor, so that within combustion of combustible components of the exhaust gases takes place in the reactor, characterized in that that the air supply means are arranged to supply air to the exhaust gas combustion reactor (14, 39) with a mass flow which is a function of both the load on the motor drive shaft (12, 37) and the speed of the motor drive shaft (13, 38), so that when the Vehicle air is supplied in a larger quantity than when working in a stationary state. 2. Exhaust arrangement according to claim 1, characterized in that that the air supply means is a pump driven by the internal combustion engine (15, 40), through which air can be supplied in a mass flow proportional to the " Speed of the motor drive shaft (13, 38), and means through which part of the pump output is deflectable from the exhaust combustion reactor (H, 39), the arrangement being such that that during an acceleration of the vehicle 209885/0985 " ORlGiNAL INSPECTED the entire outlet of the pump (15, 40) to the exhaust gas combustion reactor (H, 39) and for other modes of operation of the vehicle part of the; P. Pump discharge from the exhaust combustion reactor (14 ;, 39) is deflected,; ■ Exhaust arrangement according to claim 2, characterized in that the air deflecting means comprises a valve (20,. 41), over which a file of the pump * -; - extension 'can be deduced in the atmosphere,.'. ", -. ' . - · 4. · Exhaust arrangement according to claim 3, characterized thereby. shows that the l / eiitil (20, 41) according to the in the inlet manifold of the. yerbrenntkräf tmasßhine (10, 35) prevailing pressure state tee— is active · - ■ - ■■■ '.'- -, 5 ,, exhaust arrangement according to claim 1-, wherein the '"' t Ituftzufuhrmittel one of the combustion engine 'Driven pump contained, which is in the Jjag ©, at a discharge runs in a Sengenstrom proportional to the speed of rotation, the Hotor ^ · antriebswelie au ^ and a main air supply ; - fahrleitong, ^ eliche; the outlet of the pump * Connected to the exhaust port reactor, marked by a valve member | 30,: 52)> which can be moved between two positions, namely one iBtelluiag., iin _: which at least one part "dea"". Pump discharge is derived from the main air supply line, so that the arc flow of the deia. Exhaust combustion reactor (H, 39) supplied air is always less than the flow rate of air the pump (15, 40) can promote, and another position, with the entire unthrottled pump output is fed to the exhaust combustion reactor (14, 39) when the Y-valve member (30, 52) is in the other position is, and that the position of the VentilglLedes (30, 52) is governed by states which will affect the load on the motor drive shaft. ο Exhaust arrangement according to claim 5, characterized in that that the valve member (30) with a vent opening (29) in said main air supply line cooperates, which is open when the valve member (30) in said one Position is so that at least part of the air flowing in the main air supply line through the vent (29) exits into the atmosphere, and which is closed when that Valve is in said other position. 7. Exhaust arrangement according to claim 5, characterized in that that parallel to the main air supply line (49) is a short-circuit line (46) which Contains flow restriction means (47), and that the arrangement is such that the entire extension of the Pump (40) via the short-circuit line (46) is passed when the valve member (52) is in the said one position is located, and the valve member (52) is connected in this one position - 15 2098857098b '■: is \ fisci: -eri'"" deffl --- iujiip-eiiausla $ -, ^-; iinct. thy said portion of Havtpiiaftzufuhrie.it.ung; ".verhindert (490 and üäß ^DEA:; ': .- entire Pumpenaus thrust by; this part of the main ■ ;; - air supply line (49) .gele / itet; ■■ is ■, ■; ■■■ vreirlnV ■; ääs. ■■■: i? ■ ienr. ";■; ■■ valve element see in said other position, and the valve element in / this other position - ^A lung a connection; between the Pümpenaüsläßjund the Eurzschlussleitung (46) Verhindeicto '.,.; ■ -. ".. ■ ν \ 8 »Exhaust arrangement according to the sense of the word 6 or 7>thereby; characterized in that the valve element (30, 52} is attached to '■■'. ■ '■ ·: ■■ ". of the movable'wall; (24, 54) of a chamber, which is fitted with electrical means ' ( .33.1 59) is preloaded so that they change the valve member (30, 52) in the sawed position; ■ hold it; and. That the chamber with the inlet distributor (11., 36 ) der'Teibrennüiigskraftmäschine tiOj '35) via a vacuum line; (25, 51) ; in Ter-' -binding-stands, so that the movable wall (24 * 54) through the of: the inlet manifold (11, 36) "ν the suction loads exerted thereon against the action of the elastic means (33, 59) movable ■ ;; . 9 »exhaust system naph ^ claim 6 or 7y ^ characterized., .That / the valve member (30>;'52)'; . mechaniach .. with the: throttle rod of the ■ -: '■ _ ". combustion engine: (IQ ^ 35) connected; is _o ' ^Λ ^ te - ■ - ■■>, 1üo exhaust arrangement according to claim 7, characterized by electrical control means for controlling the Position of the valve member (30, i> 2), which on address the load on the fan drive shaft. ORIGINAL INSPECTED