DE2353925A1 - DEVICE AND METHOD FOR MONITORING AND CONTROLLING POLLUTION - Google Patents

Description

3 HANNOVKFi. 1BUFiCKHAROTSTR. 1

TELEPHONE (O5H) .62 84 73

._ Unssr ^ eithsn 23 3 / 13Bf

17 ·. October 1973

Apparatus and method for i & eaiwadhüiig and Buried by

The present ^ invention ibetrifft a Vorriehtüngr and methods for tiber monitor and control "impurities, ■ which && i. A Verlorennungskraf tsrtaschine a JäDgas ^ liäckzArku ^ 3-ation used ^ ttm <AEEN proportion of nitrogen oxides and to generally reduce KöhleniHönoxlden and hydrocarbons"

The -econonic movement has the defilement of men and women he tufted it into consciousness. In the recent past Considerable efforts have been made to keep the altitude of contaminants from commonly used in automobiles To reduce internal combustion engines. The in the atmosphere increased amount of impurities due to the increasing use of vehicles with internal combustion engines is concerned about-the health and the wellbeing-

k 0381970349

that of humans as well as other living organisms. A method for reducing the rank of combustion

machine-discharged impurities is that. To seal the system and to supply some of the exhaust gases mixed with gases from the crankcase to the intake pipe. One such The method is given in U.S. Patent 3,362,386. The arrangement indicated in the cited patent is relatively complicated and undesirably reduces the exhaust gas temperature before the exhaust gases mixed with the crankcase gases from the intake line be fed back. The arrangement does not provide for the introduction of regulated ambient air into the exhaust and / or .Suction lines.

Another arrangement to reduce * the contamination

by internal combustion engines is covered by US Pat. No. 2,722,927 known. With this arrangement, exhaust gases are supplied to the combustion chamber of an internal combustion engine to absorb the shocks dampening normally from the quick opening and closing the inlet and outlet valves result. Exhaust gases are only fed in when the maximum volumetric efficiency is reached is required. In all other cases the gases go through the Exhaust pipe out. This arrangement is very complicated since it uses controls, membranes and associated connections, and is incapable of releasing impurities during all operating conditions of the internal combustion engine to control effectively.

Λ098 19 / 034Β

It has also been proposed to use catalytic converters to be placed in the muffler to knock down impurities, before they get into the atmosphere. However, the impurities are found in the machine and, in the event of malfunctions released into the atmosphere. Such systems are also relatively expensive.

There is a need for systems that are useful for new automobiles constructed and built into them and / or easily in already Manufactured automobiles can be fitted to undesirable Reduce emissions with minimal disruption from machine operation. Such a system should be relatively cheap to manufacture and install.

The aim of the present invention is to provide an improved one To create exhaust gas recirculation device that is relatively cheap to manufacture in used automobiles or in new ones Automobile can be installed. '

This goal is achieved in that the recirculation device an exhaust gas recirculation valve, which for Fresh air from the gasifier is open and which a plate valve to control the flow of exhaust gases and / or the fresh air and the flow of exhaust gases to the carburetor facility exhibits during certain, selected operating modes the machine.

A further development of the invention relates to an improved one Exhaust gas recirculation device, which is equipped with PCV valves (forced

-A-

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common crankcase ventilation valves) equipped machines is compatible, whereby the return circulation devices a improved EGR valve (exhaust gas recirculation valve) and a speed nozzle device includes for introducing the gases and / or air into the suction line and for support flushing or cleaning the crankcase emissions of the PCV system.

Another development of the invention relates to an improved exhaust gas recirculation device for a vehicle, the the exhaust gases of the engine of a motor vehicle without any essential impairment reduce the performance of the motor vehicle.

Another embodiment of the invention relates to an improved one Exhaust gas recirculation device, which provides fresh intake air during machine operation, via a Plate valve that reacts automatically to the differential pressure of the atmosphere, in the suction line and the exhaust line, the amount of nitrogen oxides and generally hydrocarbons, Carbon monoxide, aldehyde and hydrocarbon reactivity to reduce.

Another aspect of the present invention relates to an improved exhaust gas recirculation device having a EGR valve that has double plate valves to more precisely control the flow of exhaust gas and fresh air through the EGR valve steer.

The invention is now based on exemplary embodiments, which are shown in the accompanying drawings, explained in more detail will.

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It sinxai; ■

Fig. 1 is a schematic view of a combustion

engine with a new type of contamination monitoring and regulation system, according to the present invention
- Fig. 2 is a detailed enlarged AnsiGht ,, teilv / else in Quersciinitt, the tiberwachungs- and regulation system of the present invention _f

3, 4 and 5 detailed cross-sections in which various Arbeitsjs / bellwngerf of the plate valve within a modified exhaust gas return valve the present invention / are shown,

6 shows a view of one in the exhaust gas recirculation valve according to Figs., 3 to 5 use te separation *

FIg-. 7 is a plan view of a in FIG

valve according to Fig. 3 ^: typical plate valve used up to 5, .- ·

8 shows a cross section of a further embodiment of the Exhaust gas recirculation valve, ■■; -

Fig. 3, a plan provides a Aiisführungsfoxm in FIG. 8 used secondary plate valve _t

Fig. IQ, 11, 12 and 13: Cross-sections of the modified Exhaust gas recirculation valve according to FIG. 8, which shows the Positions, äerDog |? -El; plate: ten. Represent valves during various machine operating modes,

Figures 14, 15, 16, 17 and 18 are cross-sections of another Modification of the exhaust gas recirculation valve, the different working positions of the double plate valve represents

19 shows a cross section through the exhaust gas recirculation valve according to Fig. 15 along the line 19-19,;

Fig. 20 is a plan view of the partition plate of the modification of the exhaust gas recirculation valve according to Fig. 14 to 18,.

21 shows a cross section of the exhaust gas recirculation valve according to FIG. 17 along the line 21-21,

22 is a schematic view of an exhaust gas recirculation system for an internal combustion engine including a vacuum pre-vent control, and

Fig. 23 shows another modification of an exhaust gas recirculation valve.

Xn of Figure 1 is an improved system for monitoring and control of contaminants for an internal combustion engine shown, which is the subject of the present invention. The internal combustion engine IO, in which the. Contamination monitoring and control device 12 is used, may be of conventional construction and may include an engine block 14 comprise a tub attached to the bottom of the lock is and which cooperates with the block 14 such that a crankcase is formed. The usual pistons are in the engine

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block 14 located cylinders can be actuated, the block on the top by a cylinder head 16a and a valve cover 16 is complete.

An intake line 18 is attached to the engine 10, which cooperating with the carburetor mechanism 20 and the air filter 22 connected is. With the engine block 14 an exhaust line 24 is also connected, which comprises a line or a pipe 26, the exhaust gases αμε the engine to a silencer (not shown), from which the gases can exit to the atmosphere via an exhaust gas discharge pipe. The suction and exhaust lines can be connected directly to the block 14 or the cylinder head 16a.

The internal combustion engine O contains a distribution mechanism 30 which is connected to the spark plug> Q2 is connected> which are located in the cylinder head 16a. The motor 10 may include a flywheel 15 and the other conventional accessories exhibit.

Although it is possible to use the system according to the invention for monitoring and controlling the contamination in a system use that does not have an inevitable shaft housing vent valve (PCV valve) ' has, such valves are in more recent machines incorporated, and it is desirable that the system according to of the present invention with / a system that a PCV-Venti}., which is provided with the reference number 34, is compatible. The inventive The system of FIG. 1 comprises in addition to those previously

Α Q9 819/03 4 9

elements described a speed nozzle 36, which between the carburetor 20 and the suction line 18 is connected to the inlet of the PCV valve. Additionally is the speed nozzle 36 by means of line 40 to the PCV valve of the internal combustion engine IO and via line 42 to the exhaust gas Recirculation valve 12 connected.

It is known that an effective device for reducing nitrogen oxide emissions is a recirculation of Includes exhaust gas. By recirculating part of the exhaust gas from the exhaust pipe, and by recirculating this gas through the suction line in the machine can the peak working temperature in the cylinder can be reduced and the burning rate in the cylinders can be controlled with a substantial reduction the nitric oxide donor. The amount of back circulation is critical because if the recirculation is too strong, the proportion of hydrocarbons and carbon monoxide increases and so does the performance Economy and driving characteristics of the motor vehicle worsened. The present invention proposes a device for the precise monitoring and control of the proportion of the recirculated exhaust gas by means of a plate valve, that the flow of the exhaust gas and / or the ambient air as a function of the differential pressure in the exhaust pipe, in the intake pipe and the outside air is automatically dosed. While an unfavorable influence on fuel consumption by about 5 to 20% from the use of conventional exhaust gas recirculation

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can result, the present invention, which provides a controlled fresh air ventilation from the atmosphere, contributes to the adverse effect. reduce or eliminate, the proportion of impurities that are formed by the engine and ^{emitted N} , is advantageously reduced. It has also been shown that the use of the system according to the invention reduces the Moto.rtqm.pera.tur and the service life can be increased.

In FIG. 2 in more detail, an exhaust gas Rückzirkulierventil 12 and the speed is ^sdüsee6: presented. The body or the housing 46 of the exhaust gas recirculation valve CEGR ^ valve} 12 is connected to the exhaust pipe ^ 4 or the heat riser pipe 4a or the exhaust pipe 26 via a line / 48. The body 46 has a divider plate 50 which is secured to the bottom of the body 46 by fasteners, such as screws 52, which also hold an inlet coupling 54 to the body 46. The inlet coupling communicates with the carburetor air filter via line 56. The partition plate 50 is provided with openings, for example holes 58, for establishing a connection with the chamber 60 of the valve body 46. An outlet coupling 62 in turn connects the valve body 46 to the conduit 42 which is connected to the speed nozzle 36% Inside, the chamber 60 is a Plate valve 7.0 arranged, · the alternately; cooperates with the opening 58 and the line Vehtilsitz 61 to the

^ -10-

Stream of fresh air and exhaust gases into the pollution, precisely regulate the monitoring and control system. Guide means 72 guide the movement of the plate valve 70 alternately in the direction of the openings 58 in the partition plate 50 and the Line valve seats 61 and opposite. As shown, the guide means 72 may be in the form of bolts attached to the partition plate 50 b_efestigt and in openings in the plate valve 7O are attached such that the plate valve 7O can slide on the bolt 72 with minimal friction.

Exhaust gases enter EGR valve 12 via line 48, either with the heat riser pipe 24a or the exhaust pipe connected is. Fresh air enters EGR valve 12 from the air filter 22 via line 56, inlet coupling 54 and ports 58.

When the machine is in idle mode, an amount of exhaust gas mixed with fresh air is passed through the EGR valve 12 into the intake line via the speed nozzle 36 sucked (see Fig. 3) »The amount of exhaust gas and fresh air is precisely metered through the opening 71 in the plate valve 70. If there is a high negative pressure in the piping system, If the plate valve 70 is closed against the seat at the bottom of the line 61, the openings 58 are in the partition plate 50 wide open to the atmosphere and the fresh air is made possible, into the EGR valve 12 from the air cleaner 22 via the line 56 and the inlet coupling 54 to flow. If the

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Machine is idling, fresh air flows into the recirculation valve, where it mixes with the exhaust gases, and is sucked through the metering or metering opening 71 in the center of the plate valve 70 and through the speed nozzle 36 into the intake line of the positive and negative pressures experienced in the exhaust line during idle and low speed operation. While idling, the. positive pulse forces exhaust gases into the EGR valve 12, where they are mixed with the incoming fresh air, which is generated by the suction pressure via the metering port 71 and the plate valve plus ^N negative pulses in the exhaust line. During the negative pulse in the exhaust line, fresh air is also introduced into the exhaust line via the openings 58 and the line 48. Fresh air entering the exhaust line will enter the cylinders during the exhaust valve overlap and will help complete the combustion process. The metered amounts of exhaust gases and fresh air drawn into the intake line 18 while the engine is idling are heated, this results in better evaporation of the fuel-air mixture during idling and a homogeneous fuel-air mixture that can reach all cylinders without loss of condensation. This automatically results in a lean mix without a rough idle occurring.

• Finds during low speed operation (Fig. 3) the same cycle takes place, with fresh air in the

ΛΠ981 97 0 3 49 " ¹² ~

Suction line 18 entering exhaust gases and into the exhaust line 24 incoming fresh air is mixed. Under these conditions, fresh air entering exhaust line 24 will also carry contribute to the unburned hydrocarbons (HC) and to oxidize carbon monoxide (CO) while the exhaust gases that mix with fresh air entering the intake line 18, result in better gasification and help reduce nitrogen oxides.

During high speed operation (Fig. 3) are

the positive impulses stronger than the negative impulses in which Exhaust pipe. Therefore, no fresh air is drawn into the recirculation valve. The intake line system 18 only draws in exhaust gases through the metering opening 71 in the plate valve 7O, and Exhaust gases also exit through the openings 58 and pass through the line 56 through the carburetor air filter. Reduce these exhaust gases the nitrogen oxides.

When the machine is accelerated, the plate valve 70 is pressed against the partition plate 50, with the openings 58 closed and exhaust gases are merely sucked into the intake line 18 through the line 61, coupling 62, line 42 and nozzle 36 will. This flow is increased because the plate valve 71 is removed from the inlet to the line 61. Hence the Dosing or metering area to the suction line increased considerably. In addition, there is a higher exhaust gas pressure, which the exhaust gases forcing through the line 61. No exhaust gases pass

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the openings 58 to the carburetor or air filter. It has been found that exhaust gases _r entering the upper part of the carburetor in large quantities during maximum power, the volumetric efficiency oda: the degree of filling due to the overheating and the displacement of the entering.Luft is reduced. Therefore, all of the exhaust gases recirculated during the acceleration phase pass beneath the carburetor 20.

During negative acceleration or deceleration (Fig. 5) the plate valve 70 sits firmly on the valve seat at the end of the Line 61 and a metered amount of fresh air is in the Suction line is sucked through the metering opening 71 in the plate valve 70, the coupling 54 and the line 56, the vacuum during the idle cycle is reduced and the over-rich state is lowered. There is also a high suction effect during the period. rend of braking on, generated in the exhaust pipe due to the Pumping action of the pistons. Therefore, fresh air comes in through the openings 58 in the partition plate 50 via the line 48 into the exhaust line 24 sucked from where they entered the cylinder during the Exhaust valve overlap occurs, causing the dilution of the Air-fuel mixture is reduced by exhaust gases and therefore better combustion and a reduction in all emissions enEicht.

The continued oscillation of the plate valve 70 holds the Valve seat at the bottom of the line 61 and the metering opening 71 in the Plate valve 70 clean. ^ Only filtered air escapes from the

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Gas air filter 22 into the EGR valve 12 via the clutch 54. The plate valve 70 is controlled by the differential pressure in the exhaust pipe, in the suction pipe and by the ambient pressure controlled to appropriately and precisely control the flow of exhaust gases and fresh air introduced if required steer. The plate valve 7O automatically responds to the pressure acting on its surfaces.

An advantage of the system using the EGR valve according to the present invention Invention used is that the need to use solenoids, idle control valve and associated connections, as they are in a known exhaust gas monitoring and tax system are not used. The plate or reed valve 70 is designed so that during the negative acceleration or deceleration fresh air is drawn into the EGR valve 12. This fresh air does not come with exhaust gases diluted because fresh air also enters the exhaust pipe. The fresh air enters the suction line in a metered manner through the control opening 71 in the plate valve 70 and then flows through the recirculation device 42 and the velocity nozzle to the carburetor 20, thereby causing the same metering effect is like the solenoid control valve or accelerator valve used in known systems, in a greatly simplified manner Way. The solenoid control valve of a known system keeps the throttle valve of the carburetor partially open, whereby it is achieved that more air enters the suction line

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and the over-abundant mix by reducing the vacuum during idling and emissions are reduced. This solenoid valve, however, sometimes jams, causing the throttle is partially kept open. There was a big automobile

bil recall by one of the automobile manufacturers because / this valve holding jaw was defective, causing the Throttle stuck and partially open »This problem is overcome by the present invention in that if the exhaust gas recirculation valve 12 malfunctions, the The machine just runs rough - the throttle will not jam the machine will still start to run because the plate

70
venti! / works incorrectly.

Even if the valve 12 has failed completely, the machine 10 will not start to run, rather it will tend to come to a standstill due to the no longer balanced fuel-air ratio by the excess of air flowing into the suction line 18.

When the machine is at a working speed of approximately 3000 revolutions per minute is braked to idle speed of 650 revolutions per minute, is the elapsed time longer than an engine not equipped with an EGR valve 12 according to the present invention is. The reason for this is that through the plate no valve 70 sucked fresh air into the suction line 18 over a suitable opening in the suction line or via an inlet

4 0 9-81 970349

guide plate, which is fastened between the carburetor and the intake pipe, enters, whereby a partial opening of the Throttle is simulated. Once the engine speed drops to about 1000 revolutions per minute, dte air is diluted with exhaust gases, creating a closed throttle valve is simulated and normal idle speed is maintained.

While the novel EGR valve 12 employed in a system without the universal velocity nozzle 36 would have advantages over a similar system that is not so equipped, it is more advantageous if the system included the universal velocity nozzle 36. Referring to Fig. 2, it can be seen that the velocity nozzle 36 comprises a generally L-shaped body 80 which is connected at one end to a coupling 81 which in turn is connected to the conduit 40. The line 40 is connected to the outlet of the PCV valve 34. E ± tl fitting 82 is connected at an angle to the coupling line 81. A suction line 84 extends internally from the fitting 82. The cross-sectional area of the channel in line 84 must be less than the cross-sectional area of the channel in body 80. The cross-sectional area of the channel in line 84 is used to meter the exhaust gas recirculation flow when the plate valve 70 moves away from the valve seat at the end the line 61 is removed. The length of the channel in conduit 84 must not be less than twice the diameter of the channel.

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While the engine is idling, exhaust gas mixed with fresh air is drawn into the intake line 18 via the intake plate 37. It should be noted that in some cases the intake inlet may be formed in the carburetor rather than a separate intake plate. Gases from the line 42 go into the ^v channel through the body 80 via the line 84 and the opening 85. During the acceleration, the high-speed gases coming from the line 42, the coupling 82, the line 84 and the opening 85 cause a negative pressure in the PCV connection port 86, which facilitates the flow of gas from the crankcase to the carburetor through the port 87 to aid in purging the emissions in the crankcase of the internal combustion engine and thereby aid the PCV system.

8 is another modification of the EGR valve illustrated in accordance with the present invention. The EGR valve 12 ' 8 is essentially the same as the valve of FIGS. 2 to 5 similar except that it is a two-platen construction contains. In addition to the valve 70, a valve 69 is provided. As can be seen from Fig .: 9, the plate valve 69 is very similar to plate valve 70 except that the Opening 68 in the center is larger than opening 71 in the Plate 70 and that the outer diameter of the valve plate 69 is larger is called the plate valve 70. Both valves 69 and 70 will be by suitable guides or guide means for movement in Direction towards openings 58 in the partition plate and the line 61

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and guided in the opposite direction, e.g. by the guide bolts or guide pins2.

The two-plate valve unit 12 ', shown in FIG. 8,

operates in essentially the same manner as the single valve assembly of Figures 2-5, except that in high speed operation, as particularly shown in the figure, the plate valve 69 fixed against the partition plate 50 is pressed, the openings 58 being closed for the fluid flow, namely the flow of the exhaust gas and / or the air. The area of the plate valve part 69 is a little larger than that of the plate valve part 70 and has a larger opening 68 in the center, which reduces the vacuum effect, whereby the plate valve 69 is more responsive to outlet pressure. During high speed operation, the outlet pressure pushes the plate valve 69 firmly against the partition plate 50, whereby the pressure between the plate valves 69 and 70 is increased, which in turn more exhaust gases pushes through the metering opening 71 in the plate valve 70. This causes more exhaust gas recirculation under the carburetor 20 and less through the air filter 22, which reduces the volumetric efficiency or the degree of filling, caused by recirculation hot gases, into the inlet of the carburetor.

During operation in the lower speed range (Fig. 13) the volume and pressure are those in the valve body entering exhaust gases small. Therefore, exhaust gases are dispensed via the dosing

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opening 71 sucked into the valve part 70 and enter the suction line 18 under the carburetor 20. During this low speed operation, the plate valve moves

69 due to the positive and negative pressures in the exhaust pipe towards or away from its valve seat. This ensures that fresh air in the valve body 46 over Openings 58 in the partition plate 50 where it enters with the exhaust gases is mixed and then through the metering opening 71 into the Suction line 18 is sucked.

Fig. 10 shows the positions of the valve plates 69 and

70 during the idling operation and the deceleration phase. The fig. represents the position of the valves 69 and 70 during the acceleration mode Fig. 12 'shows the valves 69 and 70 during of high-speed operation. Fig. 13 shows the position of the valves during low speed operation.

It is clear that the exhaust gas recirculation valve can be mounted on the exhaust pipe ¹ , the heat riser pipe or the pipe of the head part. The exhaust gases should enter the EGR valve from the exhaust pipe, heat riser pipe, or exhaust pipe. ■

14 to 21 show an improved embodiment of an exhaust gas recirculation valve. The structure of the. Valve 112 is very similar to those of the Ventües 12, with the Except that the two plate valves 169 and 170 are on opposite sides Sides of the partition plate 150 are disposed while

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In the embodiment according to FIGS. 10 to 12, the double plates 69 and 70 are arranged on the same side of the partition plate are.

Consider now the operation of the valve, and it is believed that the changes and improvements will be clear in the structure afterwards. 14 shows the position of the parts during idling operation. While the idle mode, the plate valve 169 sits firmly on the seat at the end of the line 161 on / and the plate or poppet valve 170 is lifted against the partition plate 150 such that a full flow of fresh air from the line 156 through the inlet portion 154 and the openings 158 in the partition plate 150 is present. Part of the fresh air is fed through the metering opening 168 in the plate valve 169 and flow through the line to the pressure nozzle 36, from where it enters the suction line 18 got. Part of the fresh air flows back to the exhaust pipe and due to the swaying effect generated in the exhaust pipe then up through the engine exhaust valves during the overlap period and back into the cylinder where he.with the> fine flowing Charge of the fuel-air mixture is mixed.

In Fig. 15 is the position of the plate valves 169 and 170 shown during the acceleration operation of the machine. The exhaust gases push plate valve 169 against the partition plate 150, whereby the passages or channels 158 and 158a in the partition plate 150 are closed for the exhaust gas flow. the

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Exhaust gases reach a pressure of 6.9 χ 10 N / m to 48.3 χ 10

'2
N / m depending on the number of revolutions of the machine and the silencer system. These exhaust gases then flow up through line 161, which is fully "open" since plate valve 169 is removed from its seat at the end of line 161. The gases can flow to the PCV system and then into the intake manifold system no fresh air into the system, since the valve 170 is seated on its seat 113, which is formed within the cover part 154 of the housing 112.

In Fig. 16, the EGR valve 112 is during high speed operation the machine shown. When the machine is at or above a speed of 80 to 96 km is operated per hour (high speed operation), the plate 169 is moved against its seat at the end of the line 161 due to the \ Scuum in the suction line system, which is in may be on the order of 254 to 406 Torr. The exhaust pressure pushes the plate valve 170 against the seal 113. The Exhaust gases entering the EGR system flow into the intake manifold's system and are then passed on in a metered manner through the metering opening 168 in the plate 169. It should be noted that that the metering opening 168 in 'the plate 169 has a marked opening, the area of which is determined by the displacement the engine with which the EGR valve 112 is used. The opening area of the opening 168 to the third power of the machine

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displacement directly proportional. As shown, the reed or plate valve 170 rests on the valve seat 113. The outlet pressures become sufficiently high that they push the reed valve closed and create a pressure in the EGR chamber 160 can build up, whereby more exhaust gases are pressed through the metering opening 168. The valve 17O interrupts the Flow of the exhaust gases and prevents them from flowing back through the fresh air system into the air filter, from where they into the carburetor could occur and then create an over-abundant air-fuel mixture.

In Fig. 17 are the positions of the valve components

shown during the braking operation of the machine. The plate valve 169 sits tightly on its seat at the end of the line due to the high vacuum in the suction line. Fresh air can now enter EGR valve 112 through inlet portion 154 and openings 158 in partition plate 150. The reed valve is close to the partition plate 150, thereby allowing the free flow of fresh air into the EGR system. The one in the EGR valve Fresh air entering 112 flows through opening 168 in plate 169 and into the velocity nozzle, where it enters the Intake line system enters and thereby reduces the high vacuum in the carburetor idle circuit. This reduces that Air-fuel ratio during the braking phase. Fresh air can also be in the opening or the channel in the inlet section 154 enter and flow through line 148,

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thereby reducing the pumping action caused by the pistons when the throttle valve is closed and there is no room for the cylinders to draw fresh air back through the exhaust system and through the exhaust valve during the overlap period into the cylinders where they are mixed with the incoming hand over lift-gas mixture _r is to generate in this way a combustible fuel-air mixture. Combustion takes place, which reduces the production of hydrocarbons and carbon monoxide.

18 shows the position of valves 169 and 170 in EGR valve 112 during low speed operation. The reed valve 170 moves away from

the .

its seat "so that in this way / into the EGR valve 112 Exhaust gases and fresh air through inlet portion 154 through opening 158 and through opening 168 in the plate valve 169, which rests on line 161, into line 161 and can then flow into the intake line system. At the same Time may be due to the differential pressure in the EGR valve 112, exhaust gases from the line 148 into the chamber in the EGR valve 112 enter below the metering opening 168 and through the metering opening flow to the velocity nozzle. At low speed operation all fresh air and all exhaust gases pass through the metering opening 168 in the center of the Plate 169 into the speed nozzle.

20 is a plan view of the partition plate 150 shown. One recognizes a centrally located multitude of lo-

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brazen or an inner circle of holes 158a of smaller size and an outer circle of larger holes 158. Also, near the peripheral edge of the partition plate 150, there are a plurality of holes 173 for receiving screws 152 which secure the inlet portion 154 to the main body 146 of the EGR valve 112. If desired, the inner circle of holes 158a can be replaced with a single central hole.

19 and 21 is the construction of the housing better shown, as well as the means for moving the plate valves towards or away from their seats. From the 19 it can be seen that the plate valve 169 is essentially a solid or non-perforated plate part is with a single central metering opening 168. On the side walls of the Housing 146 are inwardly facing projections or guide means 180, 181, 182 and 183 are provided to permit movement of plate 169 towards its seat at the end of conduit 161 to lead to or from this. This plate 169 guide means has been found to be functional in some environments is designed as if bolts or pins were attached to and through the interior of the housing and / or the partition plate suitable openings in the plate valve 169 for guiding the same passed through.

From FIG. 21 it can be seen that similar guide means are provided for guiding the valve 170 with respect to its seat 113 are. A variety of protrusions 186, 187, 188 and 189

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extend upwardly from the bottom of the inlet portion 154. The "inner diameter of the innermost surface of the guide means 186, 187, 188 and 189 located just outside of the maximum diameter · the Zuhgenventils 170. The guide means support the 'plate or poppet valve 170 in this way at movement toward or away from the valve seat with minimal friction. .- ".-" ■■ '

22, there is schematically an improved exhaust gas recirculation system has shown a fore-vacuum control mechanism in addition to the EGR valve and velocity nozzle previously described which is inserted into the pipe or conduit that connects the carburetor to the manifold forevacuum membrane connects. The pipe 201 connecting the carburetor 20 and the pre-mechanism 204 of the distributor 30 essentially has a ventilation opening 203 for venting the fore-vacuum system to retard preignition and reduce contamination to support. ■

23 is another modification of an exhaust gas recirculation valve shown. The exhaust gas recirculation valve 212 is functionally similar to valve 112 of Figures 14-18 with some design improvements. The valve seats 261 and 213 are formed from a suitable material, for example stainless steel, and are incorporated into the body or housing 246 and cover 244 incorporated. The guide means include Bolts or pins 272 attached to partition plate 250,

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and extend into recesses in body 246 and the cover 254 for holding the ends of bolts or pins 272. Bolts 272 extend through holes in plate 269 and the lower portions of the bolts include or guide the

.Plate 272..

During tests with the exhaust gas recirculation system according to FIG. 2 2 a marked reduction in emissions was noted.

The most recent test results are below in the form of Tables shown. Each test applies the California Air Resources Board's CVS-I Hot Start Standards. The results are expressed in grams per mile or grams per 1,609 km. Table I gives the results for a 1969 Ford Mustang wMer who owns a 302 CID machine ,. a 2 venturi carburetor with automatic transmission had. Table II gives the results

with a
nisse for a 1969 Plymouth / 440 CID engine, a 4 venturi carburetor with automatic transmission again. Table III gives the results for a 1970 Ford Maverick with a 170 CID engine, a 1 venturi auto-transfer carburetor. More extensive pre-tests, completed for the California Air Resources Board on or about October 25, 1972, support the specific data presented in Tables I, II, and III below.

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Table I.

Base 2.75

Device 2.24

Change - 19 in%

38.75 459.43 4.98 28.77 485.47 2.53 -26 +5 - 49

HC ' "CO CO ₂ · NO ' ^NO x NO
XC Base -2.42 27y91 516.77 3.39 4.46 4.79 contraption 1.82 16.21 548.26 1.67 1.94 2.09 modification -25 -42 +6 -51 -57 -56 in % Table II Base 3.46 47.02 653.40 4.88 6.03 6.60 contraption 3.46 31.26, 696.45 2.60 2.90 3.17 modification 0 -34 +6 -47 -52 -52 in % Table III

6.83 8.33 2.99 3.65 -56 -56

The present invention has proposed an improved system for monitoring and controlling exhaust gases using exhaust gas recirculation to reduce the pollutants formed during engine operation without compromising machine performance, strength and economy is significantly exposed to bra. The present invention reduces the peak working temperatures in the cylinders,

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the burning time is controlled and the nitrogen oxide emission is reduced. The present invention essentially discloses an EGR valve with a single plate valve or a double plate valve which controls the proportion of recirculated exhaust gas and the proportion of fresh air taken from the atmosphere for ventilation, the EGR valve system automatically responding to the differential pressures in the exhaust pipe system , the suction line system and the ambient air or fresh air.

Although in the embodiments the application of the invention is only for a four-stroke internal combustion engine with carburetors for gasoline has been shown, it should be clear to the person skilled in the art that the invention can be used for all internal combustion engines, which are operated with liquid or gaseous fuels, especially for machines with fuel injection devices and / or are equipped with superchargers, diesel engines, rotary piston machines and all embodiments on two-stroke engines.

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409819/0349

Claims (27)

"- ■■ - ■ ■■■ - - - -25- ' " P a t e η t a η s ρ r ü c h a .) Internal combustion engine, in which a fuel-air mixture is compressed, with an exhaust line, an intake line and a carburetor exhaust gas recirculation device for regulating the flow of part of the exhaust gases from the exhaust line to. Intake line with automatic response or automatic response to atmospheric pressure, pressure in the intake line and pressure in the exhaust line in order to reduce the formation of impurities formed inside the internal combustion engine, characterized in that the recirculation device comprises an exhaust gas recirculation system which is open to fresh air from the gasifier and which has a plate valve to control the flow of exhaust gases and / or <fc fresh air and the end flow of exhaust gases to the gasifier during selected working methods or operating modes of the machine. · 2. Machine according to claim 1, characterized in that the recirculation device has a speed nozzle for supplying fresh air and exhaust gas into the intake line and for flushing the crankcase gases of the internal combustion engine. 3. Machine according to claim 2, characterized in that the. Rückzirkulierventil exhaust gas between the intake pipe and the exhaust pipe disposed ^sec. -30-4098 1970349 4. Machine according to claim 2, characterized in that the exhaust gas recirculation valve is arranged between the intake pipe and the exhaust pipe. 5. Machine according to claim 2, characterized in that the exhaust gas recirculation valve is arranged between the intake line and the heat riser pipe. 6. Machine according to claim 1, characterized in that the internal combustion engine comprises a PCV valve (positive crankcase ventilation valve) and that the speed nozzle is arranged between the intake line, the PCV valve and the exhaust gas recirculation valve. 7. Machine according to claim 6, characterized in that the An exhaust gas recirculation valve having an opening /. Partition plate and an outlet to the suction line, the plate valve being movable within the exhaust gas recirculation valve and the flow through the openings in the partition plate and the Outlet controls. 8. Machine according to claim 7, characterized in that a metering opening or metering opening is provided in the plate valve, which allows a controlled flow, even if that -31- 4098 19/03 49 ■■ .- ■■■ - -31- ■. ■■■ '■■ Plate valve closes the outlet of the suction line. 9. Machine according to claim 7, characterized / that a metering opening or metering opening is provided in the plate valve, the opening area of which is a function of the motor volume displacement. 10. Machine according to claim 1, characterized in / that the exhaust gas recirculation valve comprises a separating plate having openings, an inlet from the carburetor device / an outlet to the suction line and an inlet from the exhaust gas line / wherein the valve is within the exhaust gas recirculation valve between the separating plate and the outlet to the intake manifold and further guide means in the exhaust gas recirculation valve for guiding the movement of the plate valve toward or away from the partition plate and toward and away from the outlet to the intake manifold. . 11. Machine according to claim 10, characterized in that the guide means comprise bolts extending substantially perpendicular to the partition plate and the outlet. . 12. Machine according to claim 10, characterized in that the guide means in the exhaust gas recirculation valve have projections which are arranged around the plate valve and interact with its periphery. 4 0 9819/0349. 13. Machine according to claim 1, characterized in that the exhaust gas recirculation valve comprises an apertured partition plate, further an inlet from the carburetor, an outlet to the suction line and an inlet from the exhaust line and two plate valves which are in the exhaust gas recirculation valve for control of the current passing through are arranged. 14. Machine according to claim 13, characterized in that the two plate valves are arranged between the partition plate and the outlet to the suction line. 15. Machine according to claim 13, characterized in that the two plate valves are arranged on opposite sides of the partition plate. 16. Machine according to claim 15, characterized in that there is a first plate valve between the separating plate and the suction line outlet and that there is a second plate valve between the separating plate and the inlet of the carburetor device and that between the separating plate and the body of the exhaust gas recirculation valve, the the first plate valve contains formed chamber communicating with the exhaust line inlet. 17. Machine according to claim 16, characterized in that the -33- 4098 19/0349. . first plate valve has a metering opening or metering opening through which a flow comes about when the first plate valve sits on his seat and closes the outlet to the carburetor device. .-.-. "■ A machine according to claim 16, characterized in that the area of the opening, the metering opening is a function of the displacement of the internal combustion engine or of the engine volume displacement. . "- .. ■" 19. A machine according to claim 6, characterized in that the speed nozzle comprises a body with a channel, one end of which communicates with the PCV valve and the other end of which communicates with the suction line, and further a suction inlet connected to the outlet of the suction line in the exhaust gas recirculation valve in communication, wherein the flow through the intake inlet in the duct to the velocity nozzle induces a negative pressure in the PCV system to assist in purging the emissions of the crankcase of the internal combustion engine. 20. A method for reducing pollution in a combustion engine in which a fuel-air mixture is compressed and which comprises a PCV system, characterized in that part of the exhaust gases circulates back from the exhaust pipe to the intake pipe as a function from the air pressure, ■ -34- 4098 Ί 9/034 9 the pressure in the suction line and the pressure in the exhaust line, that fresh air is added to the exhaust gases, if necessary, during various machine operations in order to ensure the formation of impurities without compromising engine performance and that the emission from the crankcase the internal combustion engine is flushed to stop working of the PCV system. 21. Machine in which a fuel-air mixture is compressed, with an exhaust line, an intake line and fuel supply device, with an exhaust gas recirculation device for regulating the flow of a part of the exhaust gases from the exhaust line system to the intake line system with automatic reaction or independent response or as a function of atmospheric pressure, pressure in the suction line and pressure in the exhaust line, in order to reduce the formation of impurities formed in the interior of the machine, characterized by a recirculation device having an exhaust gas recirculation valve, further means for controlling the flow of the exhaust gases and / or the fresh air and the final flow of exhaust gas to the air inlet of the fuel supply device during selected modes of operation or modes of operation of the machine. 22. Machine according to claim 21, characterized in that the exhaust gas recirculation valve has an outlet to the intake line, a -35- 40981 97 0349
ORIGINAL IINTSPECTED - 7353925 having apertured partition plate, the plate valve is movable within the exhaust gas recirculation valve to control the flow through the openings in the partition plate and the outlet, and further guide means in "the exhaust gas recirculation valve to guide the movement of the plate valve. 23. Machine according to claim 21, characterized in that the machine is an internal combustion engine4st, that the fuel supply device comprises the carburetor device, and that the exhaust gas recirculation valve has a partition plate with openings, an inlet from the Vergasereinrichtuhg, an outlet to the intake line, an inlet from the exhaust line and two plate valves mounted in the exhaust gas recirculation valve for controlling the flow therethrough. - 24. Machine according to claim 23, characterized in that the,. ' two plate valves are arranged on opposite sides of the partition plate; and that guide pins or guide bolts are arranged on the partition plate for guiding the movement of the two valve plates. 25. Machine according to claim 24, characterized in that the guide pins extend through complementary openings in a plate valve and the periphery of the other plate valve. tils surrounded. ' ■ '.--;"ί .- ?. i .-. r- ^f ΐ ■. .. j _ii: r; y; ■ .-- y --.- ■ :: - . "■ -36- 4098J B / 0 26. Machine according to claim 6, characterized in that the internal combustion engine comprises a carburetor and a distributor with a vacuum membrane, that a fore-vacuum line connects the carburetor with the vacuum membrane and that a device is provided which discharges air into the fore-vacuum line to the structure of the To delay the fore-vacuum that would otherwise arise at a given speed or rotational speed of the internal combustion engine, and to help reduce the formation of impurities. 27. Machine according to claim 21, characterized by a manifold with a vacuum membrane and a fore-vacuum line connecting the fuel supply device and the vacuum membrane, and by openings for supplying air from the atmosphere into the fore-vacuum line in order to delay the pre-ignition and the formation of impurities to support. 40981 97 0349 Lee rse i t e