KR20100083143A - System for introducing a vaporized fuel inside an exhaust element - Google Patents

Abstract

The invention relates to a system (6) for introducing a vaporized fuel inside an exhaust element, in particular a catalytic converter (2), that belongs to an exhaust line (1) of a motor vehicle having an internal combustion engine, this system (6) comprising, firstly, a means (7) for vaporizing the fuel, secondly, a means for introducing the vaporized fuel into the exhaust element (2), and, thirdly, a means (8) for supplying fuel to the vaporizing means (7). This system (6) is characterized in that it comprises a means (12) for draining at least the vaporizing means (7) or even at least part of the supply means (8).

Description

System for injecting vaporized fuel into the exhaust element {SYSTEM FOR INTRODUCING A VAPORIZED FUEL INSIDE AN EXHAUST ELEMENT}

The present invention relates to a system for injecting vaporized fuel into an exhaust element included in an exhaust line of a combustion engine vehicle.

TECHNICAL FIELD The present invention relates to the field of automobiles and, more particularly, to equipment for facilitating the emission of gases generated during fuel combustion in internal combustion engines.

Such equipment comprises a plurality of exhaust elements arranged sequentially in the exhaust system along the gas flow direction in the form of exhaust lines connected to the engine.

Such exhaust lines generally comprise exhaust elements consisting of a catalyst (especially an oxidation catalyst), a particle filter (FAP) and a silencer.

The particle filter includes a plurality of passages and tends to soot or similar particles enter the passages and collect and block the passages after a period of engine operation.

In order to solve this problem, the temperature of the exhaust gas which is installed upstream of the oxidation catalyst, on the one hand vaporizes fuel (especially diesel), and on the other hand, fuel vapor is introduced into the oxidation catalyst and introduced into the particle filter. There is a way to use the system to increase.

The rise in temperature of the exhaust gas may cause combustion of particles in the particle filter, thereby ensuring regeneration of the particle filter.

However, this method has some problems.

The fuel consists of a hydrocarbon mixture with carbon rings of varying lengths, thus representing different vaporization temperatures.

Thus, for fuels consisting of diesel, the shortest carbon rings are vaporized at 160 ° C, while the longest carbon rings are vaporized at 380 ° C.

The fuel vaporization means is supplied with fuel by supply means connected to a fuel tank in which fuel at room temperature is stored.

Thus, the fuel in the supply circuit of the vaporization means and the vaporization means represent a temperature between the room temperature of the reservoir (tank portion) and the temperature of the vaporization means (heating element included in the vaporization means).

However, when the fuel supply of the vaporization means is stopped, the vaporization means and the fuel in the supply circuit close to the vaporization means have a temperature lower than the highest vaporization temperature, or a temperature between the highest and lowest temperature of the vaporization temperature (for example, 160 for diesel). Temperature between 캜 and 380 캜).

These fuels are only partially damaged, especially when the temperature is between the highest and lowest values of the vaporization temperature, and therefore contains large concentrations of heavy hydrocarbons (long carbon rings), which causes the fuel to lose the texture of mud or tar. Have it.

However, the vaporization means and the portion of the supply circuit close to the vaporization means are arranged very close to the exhaust line (or fixed to the exhaust line itself), and the exhaust line passes the mud or tar on the wall of the vaporization means or the passage of the supply circuit. It has sufficient operating temperature to deform into an element that is well adhered and fixed to it. The presence of such a carbon element can be a decisive problem for the operation of the vaporization apparatus by limiting the amount of fuel injected into the vaporization means or even interrupting the input itself.

The present invention aims to solve the problems of the apparatus according to the prior art described above.

The present invention relates to a system for introducing vaporized fuel into an exhaust element, in particular a catalytic converter, included in an exhaust line of an internal combustion engine vehicle, the system comprising: fuel vaporization means, means for introducing vaporized fuel into the exhaust element and the vaporization means; Means for supplying fuel, characterized in that it comprises drain means at least in said vaporization means, or at least part of said supply means.

Another feature of the invention is that the drain means is at least partly composed of a fuel outlet pipe connected to the supply means or vaporization means and a fuel storage tank.

According to the first embodiment, the discharge pipe is composed of a specific pipe connecting a fuel storage tank to the vaporization means or the supply means from time to time.

According to another embodiment, the discharge conduit consists of a portion of the fuel return pipe connecting the engine to the fuel storage tank and a conduit connecting the part of the return pipe to the vaporization means or the supply means.

The invention also relates to an exhaust line comprising a catalytic converter, in particular an oxidative catalytic converter, a particle filter, and a system arranged upstream of the catalytic converter for injecting vaporized fuel into the catalytic converter. .

An advantage of the device according to the invention is the inclusion of drain means for this after use of the vaporization means.

The presence of the drain means prevents the unvaporized fuel from splitting due to the temperature of the exhaust line and / or the heating element of the vaporization means, in addition to the normal operation of the vaporization means. This ensures that the vaporization means is operated without clogging.

Other advantages of the present invention will appear in the detailed description through the following embodiments, but the embodiments are only examples and are not intended to limit the present invention.

1 is a view schematically showing an exhaust line having a vaporized fuel input system according to the present invention.

TECHNICAL FIELD The present invention relates to the field of automobiles and, more particularly, to equipment for facilitating the emission of gases generated during fuel combustion in internal combustion engines.

Such equipment comprises a plurality of exhaust elements arranged in sequence in the exhaust line 1 along the gas flow direction, in the form of an exhaust line 1 connected to the engine.

As shown in FIG. 1, the exhaust line 1 comprises at least one catalytic converter 2, in particular an oxidation catalytic converter, and a particle filter 3 along the gas flow direction.

In a particular embodiment (not shown), the catalytic converter 2 and the particle filter 3 may be arranged in the same exhaust element layer, which is generally called "cata-fap".

However, in FIG. 1, the catalytic converter 2 and the particle filter 3 are each arranged in different exhaust element layers, which are connected to each other via an exhaust pipe 4.

In addition, such an exhaust line 1 may comprise a turbocharger 5 located upstream of the catalytic converter 2 along the gas flow direction, one side of which is connected to the engine and the other side to an exhaust pipe. It is connected to the catalytic converter 2 via (4).

This exhaust line 1 further comprises a system 6 which ensures the regeneration of the particle filter 3. In the absence of such a system 6, over time as the engine runs, the particle filter 3 may become clogged due to particles (especially burning) and may be completely blocked.

The system 6 is configured to introduce vaporized fuel (especially diesel) into the oxidation catalytic converter 2, to raise the exhaust gas temperature inside the exhaust line 1, in particular to decompose particles within the particle filter 3. To regenerate the filter.

As shown in the figure, the system 6 is located upstream of the oxidation catalytic converter 2, in particular between the oxidation catalytic converter 2 and the turbocharger 5, preferably the turbocharger 5. It is located closer.

The system 6 is connected with the internal volume of the catalytic converter 2 to enable the injection of vaporized fuel into the catalytic converter 2.

As shown in the figure, the system 6 also comprises fuel vaporization means 7.

The vaporization means 7 houses a heating element for fuel vaporization therein in the form of a housing and has a liquid fuel inlet and a vaporized fuel outlet.

The vaporized fuel outlet is connected to the internal volume of the catalytic converter 2 via means which are included in the system 6 and configured to introduce vaporized fuel to the catalytic converter 2, which means in particular the vaporization means 7. ) And a pipe that is connected to the exhaust pipe 4 '.

The system 6 also comprises means 8 for supplying liquid fuel to the vaporization means 7.

The supply means 8 is at least partly provided with a vaporization means 7 (particularly a liquid fuel inlet of the vaporization means 7) and a fuel storage tank 10, in particular a supply pipe 9 connected to a fuel storage tank for engine supply. It consists of.

Said supply means 8 may also comprise means 11 for ensuring fuel flow to the supply pipe 9, which means 11 may be a pump or a similar configuration.

Another feature of the system 6 is that it may further comprise means for adjusting the flow rate of the fuel introduced into the vaporization means 7. The adjusting means may be arranged at the level of the vaporizing means 7, or preferably at the feeding means 8, in particular of a solenoid ball or similar configuration.

According to the invention, the system 6 comprises at least a drain means 12 of the vaporization means 7 or a part of the supply means 8, in particular part of the supply pipe 9.

As shown in the figure, the drain means 12 consist at least in part on the discharge pipe 13 of the fuel of the vaporization means 7 or the supply means 8.

The discharge pipe 13 is connected to the vaporization means 7 on the one hand (directly or indirectly) and to the fuel storage tank 10 on the other hand collecting the discharged fuel.

The discharge pipe 13 is directly or (preferably) indirectly supplied to the vaporization means 7 (particularly the fuel inlet of the vaporization means) and the supply pipe 9 (particularly the supply pipe 9 included in the supply means 8). )

According to the first embodiment (indicated by the bold dashed line in the drawing), the discharge pipe 13 is connected to the fuel storage tank 10 on the one hand and on the other hand to the vaporization means 7 or (preferably) It may consist of a specific pipe which is connected to the feed tube 9 of the means 8.

In this case, the pressure inside the catalytic converter 2 is higher than the internal pressure of the vaporization means 7, and the fuel contained in the vaporization means 7 is pushed out such that it does not come into contact with the heating element.

According to a second embodiment (indicated by a small dotted line in the drawing), the discharge pipe 13 is on the one hand a part 14 of the return pipe 15 connected to the fuel storage tank 10, on the other hand the return It may consist of a conduit 16 which connects a portion 14 of the tube 15 and the vaporization means 7 or (preferably) the supply means 8 (in particular the feed tube 9 of the feed means 8). have.

In this regard, when the fuel input system in the engine is operated at a low return flow rate (high pressure pump incorporating a low pressure part), the relative pressure of gravity and exhaust can sufficiently push the fuel out of contact with the heating element of the vaporization means. .

However, when the fuel input system in the engine is operated at a high return flow rate (a low pressure pump separate from the high pressure pump), the discharge pipe 13 is designed to suck at least the fuel contained in the vaporization means 7 into the discharge pipe 13. It can be configured by adding means.

Such a suction means may preferably consist of a venturi element arranged in the discharge tube 13, in particular in a portion 14 of the return tube 15.

In a further feature of the invention, irrespective of the drain means 12, the system 6 may further comprise means 17 for opening and closing the discharge pipe 13.

Such opening and closing means 17 is preferably composed of a valve, in particular an electric valve.

On the one hand, the opening and closing means 17 is in a closed position to prevent fuel inflow into the discharge pipe 13 (i.e., prevent fuel discharge) when fuel is supplied to the vaporization means 7, and on the other hand, The discharge pipe 13 is in an open position such that fuel is introduced (ie, fuel is discharged).

According to the invention, the system 6 furthermore comprises a drain means 12 (in particular open and close means 17), furthermore fuel supply means 8 (in particular pumps and / or regulating means) and / or vaporization means ( 7) (in particular the heating element contained by said means).

Thus, the control means operates the fuel supply means 8 to supply fuel to the vaporization means 7 in the state where the opening and closing means 17 are closed, and when the regeneration of the particle filter 3 is performed. It can be configured to operate the heating element.

In addition, the control means can also be configured to open and close the opening and closing means 17 and deactivate the supply means 8 during the drainage operation of the vaporization means 7 or the supply means 8.

In this regard, the control means can also be configured to activate (or maintain activation) the heating element at least during operation of the vaporization means 7.

The invention also comprises a catalytic converter (2), in particular an oxidation catalytic converter and a particle filter (3) and a system (6) for injecting vaporized fuel into the catalytic converter (2), the exhaust line comprising the above characteristics It is about (1).

The system 6 is located upstream of the catalytic converter 2 and further (preferably when the exhaust line 1 comprises a turbocharger) between the catalytic converter 2 and the turbocharger 5. , Preferably closer to the turbocharger 5.

Claims (12)

A system 6 for introducing vaporized fuel into an exhaust element, in particular a catalytic converter, included in an exhaust line 1 of a motor vehicle having an internal combustion engine, the fuel vaporizing means 7, which injects vaporized fuel into the exhaust element 2. A system (6) comprising means and a means (8) for supplying fuel to the vaporization means (7),
System comprising at least said vaporizing means (7) or at least part of said supply means (8). The method of claim 1,
The drain means 12 of the vaporization means 7 are at least partially connected to the supply means 8 or the vaporization means 7 on the one hand and to the fuel storage tank 10 on the other hand ( 13) system characterized in that the configuration. The method of claim 2,
The discharge pipe (13) is characterized in that it consists of a specific pipe connecting the fuel storage tank (10) to the vaporization means (7) or the supply means (8) from time to time. The method of claim 2,
The discharge pipe 13 supplies the part 14 of the fuel return pipe 15 and the part 14 of the return pipe 15 which connects the engine to the fuel storage tank 10 by the vaporization means 7 or the supply. System characterized in that it consists of a conduit (16) connecting to the means (8). The method of claim 4, wherein
The discharge pipe (13) further comprises means for sucking at least fuel contained in the vaporization means (7) in the discharge pipe (13). The method according to any one of claims 2 to 5,
The drain means (12) is characterized in that it comprises a means (17) for opening and closing the discharge pipe (13). The method according to any one of claims 1 to 6,
The fuel supply means 8 of the vaporization means 7 are at least partly composed of a supply pipe 9 connected to the vaporization means 7 on the one hand and to the fuel storage tank 10 on the other hand. System. The method according to any one of claims 1 to 7,
Said fuel supply means (8) comprise means (11) for ensuring fuel flow to said supply pipe (9). The method according to any one of claims 1 to 8,
Means for regulating the flow rate of fuel introduced into said vaporization means (7). The method according to any one of claims 1 to 9,
Means for controlling said drain means (12), fuel supply means (8) and / or vaporization means (7). A catalytic converter 2, in particular an oxidation catalytic converter, a particle filter 3, and a system 6 arranged upstream of the catalytic converter 2, for injecting vaporized fuel into the catalytic converter 2, claims 1 to 3. An exhaust line, characterized in that it comprises a system (6) according to claim 10. The method of claim 11,
An exhaust line, characterized in that it comprises a turbocharger (5) upstream of the catalytic converter (2), wherein a system (6) for injecting vaporized fuel into the exhaust line (1) is arranged near the turbocharger.

Images