JP5067347B2 - Exhaust purification device - Google Patents

Description

  The present invention relates to an exhaust emission control device for purifying exhaust gas discharged from an internal combustion engine.

Conventionally, it is purified by removing nitrogen oxides (NO _x ), carbon monoxide (CO), and particulate matter (hereinafter abbreviated as PM) contained in exhaust gas discharged from an internal combustion engine. Many techniques have been proposed to do this. Specifically, a method of reacting unburned fuel (HC), CO and NO _x in exhaust gas using a three-way catalyst and reducing it to carbon dioxide (CO ₂ ) or harmless nitrogen gas (N ₂ ), A method of burning and removing PM in exhaust gas using nitrogen dioxide (NO ₂ ) while collecting PM in exhaust gas using a filter, a method of reducing NO _x on a catalyst using ammonia (NH ₃ ), and the like are known.

Some exhaust purification methods as described above promote an oxidation / reduction reaction on a catalyst or a filter by providing an injector device for supplying an additive into exhaust gas in the exhaust passage. For example, a reducing agent addition nozzle for injecting fuel (HC) is provided in the exhaust pipe, and the injected HC acts as a reducing agent for the exhaust purification catalyst and the filter temperature is increased to activate the exhaust purification catalyst. , A urea water [CO (NH ₂ ) ₂ ] injection valve is provided in the exhaust pipe upstream of the reduction catalyst capable of reacting NO _x and NH ₃ to promote the NO _x reduction reaction on the reduction catalyst Etc. are known.

By the way, when such an injector device is provided in the exhaust passage in a state exposed to the exhaust gas, there is a risk of deterioration due to heat and solidification of components at the injection hole of the injector device. Therefore, in order to protect the injector device, it has been proposed to arrange the injector device so that the nozzle hole is not directly exposed to the flow of exhaust gas.
For example, Patent Document 1 discloses a configuration in which a conical injection space is provided on a side surface of an exhaust passage, an injection hole of an injector device is disposed therein, and an additive is supplied into the exhaust passage through the injection space. Has been. In this technique, an injection space in which exhaust gas does not easily flow is formed, thereby preventing exposure of the injector device to the exhaust gas flow and protecting the injection hole.
JP 2004-197635 A

  However, in the structure like the technique of Patent Document 1, since the exhaust gas hardly flows into the injection space, the additive component evaporated near the injection hole of the injector device is likely to adhere to the inner wall surface of the injection space. There is a problem that it is easy to deposit as it is. For example, in the case of an injector device that injects HC, the evaporated fuel acts as a binder and may combine with PM that slightly flows in from the exhaust passage side to generate a deposit layer on the inner wall of the injection space. Such a deposit layer presses the shape and volume of the injection space itself, and may cause spraying troubles.

  Moreover, in the technique described in Patent Document 1, since the injection direction of the additive injected from the injector device is fixed in one direction, there is a problem that a uniform diffusion concentration may not be ensured. That is, since the flow rate of the exhaust gas flowing through the exhaust passage changes according to the operating state of the engine, when the additive injected by the increase in the exhaust flow rate is swept away in the exhaust pipe, the vertical plane with respect to the exhaust flow in the exhaust pipe The distribution of the additive on the top becomes non-uniform. Therefore, the concentration of the additive supplied to the exhaust purification catalyst is also biased, and there is a possibility that good purification efficiency cannot be obtained.

  The present invention has been made in view of the above problems, and provides an exhaust emission control device capable of expanding an injection range with a simple configuration, thereby preventing spray failure and improving purification efficiency. The purpose is to do.

An exhaust emission control device according to the present invention (Claim 1) is inclined at a predetermined angle with respect to an additive injection means (injector) for injecting an additive into an exhaust passage of an internal combustion engine and an injection direction of the additive (that is, , obtain Preparations and rotary drive means (actuator) for rotating the additive injection means about a non-parallel) rotational axis of the injection direction of the additives.
In other words, additive injection means for supplying the additive into the exhaust passage of the internal combustion engine, rotational drive means for rotationally driving the additive injection means, and rotational drive formed on the additive injection means direction inclined at a predetermined angle with respect to the axis of rotation of the rotary drive by means (i.e., the rotation axis non-parallel direction) obtaining Bei and injection hole for injecting the additive into. The additive injection means is formed in a shaft shape, and the rotation driving means rotationally drives the additive injection means with the central axis of the additive injection means as the rotation axis.

That is, an additive injection unit that is formed in a shaft shape having a central axis inclined at a predetermined angle with respect to the injection direction of the additive, and that injects the additive into the exhaust passage of the internal combustion engine, and the additive injection unit And a rotation driving means for driving the additive injection means to rotate about a rotation axis coinciding with the central axis.
Further, the exhaust passage further includes a housing portion having one end opened to communicate with the exhaust passage and the other end disposed with the additive ejecting means, and the additive ejecting means is disposed inside the housing portion. thereby injecting the additive to the outside of the housing portion from the rotary drive means, to change the injection direction of the additives to the wall surface direction of the housing portion by rotationally driving the additive injection means .

The exhaust emission control device according to the present invention (Claim 2 ) is characterized in that the additive injecting means is oriented to be inclined with respect to each of the exhaust flow direction and the direction orthogonal to the flow direction, It is characterized by being arranged so that one end side to be injected is located on the downstream side of the exhaust passage from the other end side.
An exhaust emission control device according to the present invention (Claim 3 ) includes, in addition to the configuration according to Claim 3 or 4, an ultrasonic vibrator that generates bubbles in the additive ejected from the additive ejecting means, And a control device that drives the ultrasonic transducer when the injection direction of the additive is changed to the wall surface direction of the housing portion by the rotation driving means.

  According to the exhaust emission control device of the present invention (Claim 1), the injection direction is easily changed by rotating the additive injection means by inclining the rotation axis with respect to the injection direction (non-parallel). be able to. Moreover, since the injection direction is not parallel to the rotation axis, the displacement of the injection range becomes larger than the displacement of the injection position (for example, the injection hole) changed by the rotation. Therefore, the injection range covered by one additive injection means can be substantially expanded.

  Thereby, for example, it becomes possible to selectively use the injection direction for supplying the additive to the exhaust passage side and the injection direction for supplying the wall surface side, so that deposits attached to the wall surface side can be removed. Become. Alternatively, the injection direction can be controlled so that the distribution of the injected additive is uniform.

Further, it is possible to rotate the drive without moving largely to the accompanying pressure agent injection means, it is possible to enhance the space efficiency.
Note that the injection direction can be changed without matching the central axis of the additive injection means with the rotation axis.

Further, by providing the additive injection means yield capacity portion, it is possible to protect the additive injection means from the exhaust heat. Furthermore, the injector provided for injecting the additive into the exhaust passage can be used as a mechanism for deposit cleaning. That is, a new function of deposit component removal and removal functions can be added to the injector, and the functions can be used properly according to the situation.
Further, according to the exhaust emission control device of the present invention (Claim 2 ), the additive injection means is disposed obliquely with respect to the exhaust passage and is oriented downstream of the exhaust, whereby the downstream wall surface of the housing portion is provided. The additive can be easily supplied, and the deposit removing effect can be enhanced.

Further, according to the exhaust emission control device of the present invention (Claim 3 ), the deposit separation and removal performance can be improved by injecting the additive containing bubbles onto the wall surface of the housing portion. In addition, since the additive injected to the exhaust passage side outside the housing portion does not include bubbles, the performance of the downstream catalyst and filter can be ensured .

Hereinafter, an embodiment will be described with reference to the drawings.
1 to 5 are for explaining the exhaust gas purifying device according to an embodiment, FIG. 1 is a schematic diagram of an exhaust system of an internal combustion engine according to the present invention, FIG. 2 is an exhaust gas purification according to the present invention 3 is a schematic cross-sectional view showing the overall configuration of the apparatus, FIG. 3 is a cross-sectional view of an injector in the apparatus (A-A cross section of FIG. 2), and FIG. 4 is a flowchart for explaining the control contents of the apparatus. FIG. 5 is a schematic cross-sectional view for explaining the operation of the apparatus. FIG. 5A shows a state in which the additive is injected toward the wall surface of the housing portion, and FIG. The state reflected by is shown.

  6 is a schematic configuration diagram of an exhaust system of an internal combustion engine in a vehicle to which an exhaust emission control device as a modification is applied, and FIG. 7 is a schematic cross-sectional view showing an overall configuration of the exhaust purification device as a modification. .

[1. overall structure]
An engine 10 shown in FIG. 1 is a diesel engine using light oil as fuel (HC), and an exhaust passage 11 and an intake passage 12 are connected to the engine 10. Intake air is introduced into the combustion chamber of each cylinder of the engine 10 through an intake passage 12, and exhaust gas after combustion (hereinafter also simply referred to as exhaust) is discharged to the outside through the exhaust passage 11. In addition, a turbocharger (supercharger) 13, an oxidation catalyst 7, and a filter 14 with a catalyst are interposed on the exhaust passage 11 in order from the upstream side of the exhaust flow.

The turbocharger 13 is interposed so as to straddle each of the exhaust passage 11 and the intake passage 12. The turbocharger 13 rotates the turbine using the exhaust pressure of the exhaust gas flowing through the exhaust passage 11, and uses the rotational force. The turbocharger compresses intake air from the intake passage 12 and supercharges the engine 10 by driving the compressor.
The oxidation catalyst 7 is a catalyst including a catalyst noble metal, oxidizes nitrogen oxide (NO) contained in the exhaust gas to generate nitrogen dioxide (NO ₂ ), and supplies this NO ₂ to the downstream filter 14. Is. The oxidation catalyst 7 also functions to oxidize unburned fuel (HC) in the exhaust to generate oxidation heat and raise the exhaust temperature. In addition, the oxidation catalyst 7 is publicly known in which alumina powder is coated (coated) on a honeycomb-shaped carrier made of cordierite, ceramics, etc., and fine particles of a catalyst noble metal such as platinum, rhodium, and palladium are supported. It has the structure of

  The filter 14 is a porous filter (for example, a ceramic filter) that collects particulate matter (particulate matter mainly composed of carbon C, PM) in exhaust gas. As schematically shown in FIG. 1, the interior of the filter 14 is divided into a plurality of parts along the flow direction of the exhaust gas by the wall body, and when the exhaust gas passes through the wall body, to the wall body or the wall body surface. PM is collected and exhaust gas is filtered.

On the filter 14, the collected PM is incinerated under a predetermined temperature condition using NO ₂ generated by the oxidation catalyst 7 as an oxidizing agent. Thereby, PM accumulated on the wall of the filter 14 is removed, and the filter 14 is regenerated and purified.

[2. Injector]
Between the turbocharger 13 and the oxidation catalyst 7, a base 11a having a shape bulging from the inside to the outside of the exhaust passage 11 is fixed, and a shaft-like injector is used as an additive injection means for the base 11a. 1 (additive injection valve) is attached. The injector 1 is a device that injects HC as an additive into the exhaust passage 11. A bearing (not shown) is interposed between the injector 1 and the base 11a, and the injector 1 is supported so as to be rotatable with respect to the base 11a.

  As shown in FIG. 2, the outer shape of the injector 1 is a rotating body centered on the axis C, and a nozzle hole 3 is formed at the tip end portion 1 a. Further, the injection direction of the additive from the nozzle hole 3 is not parallel to the axis C, and the angle formed between the injection direction of the additive and the extending direction of the axis C is θ. Further, a gear 1 c is fixed on the outer periphery of the injector 1. The central axis of the gear 1 c coincides with the axis C of the injector 1.

The axis C of the injector 1 is oriented to be inclined with respect to each of the exhaust flow direction and the orthogonal direction, and the distal end portion 1a (one end side) is more exhausted than the base end portion 1b (the other end side). It arrange | positions so that it may be located in the downstream. That is, the tip 1a of the injector 1 is slightly inclined toward the downstream side of the exhaust.
In the present embodiment, the nozzle hole 3 is drilled at a position slightly shifted from the point located on the axis C in the tip end portion 1a of the injector 1, but the position of the nozzle hole 3 is not limited to this.

  The pedestal 11a has a hemispherical space recessed from the exhaust passage 11 side, and the injection hole 3 of the injector 1 is provided toward this space. Hereinafter, this space is referred to as the accommodating portion 4. Further, among the wall surfaces forming the accommodating portion 4, a description will be given by attaching a reference numeral 4 a to the downstream wall surface of the exhaust flow and attaching a reference numeral 4 b to the upstream wall surface. The additive injected from the injection hole 3 is supplied into the exhaust passage 11 through the accommodating portion 4.

In addition, since the accommodating part 4 is provided in the position remove | deviated to the orthogonal direction with respect to the extension direction of the exhaust passage 11, the flow of exhaust_gas | exhaustion becomes difficult to flow in. In particular, the exhaust does not directly flow into the back side (near the bottom of the recessed space) of the accommodating portion 4 where the injection hole 3 of the injector 1 is located.
An additive supply device 5 is connected to the base end portion 1b of the injector 1 via a swivel joint (not shown). The additive supply device 5 includes an ultrasonic transducer 5a and a supply pump 5b. The supply pump 5 b pressurizes the additive in accordance with the injection pressure of the injected additive and sends it to the injector 1. The ultrasonic vibrator 5a is a piezoelectric element (piezoelectric ceramic) for forming, for example, cavitation bubbles in the injected additive. In addition, the cavitation bubble here means the fine bubble produced in an additive liquid by ultrasonic vibration. Thereby, the injector 1 can inject the additive which has a cavitation bubble in a liquid.

  Further, in the present exhaust purification apparatus, an actuator 2 (rotation drive means) that rotationally drives the injector 1 itself is provided adjacent to the injector 1. As shown in FIG. 3, the actuator 2 includes a worm 2a and a motor 2b. The motor 2b drives the worm 2a with an arbitrary amount of rotation, and the worm 2a is a screw gear that is rotatably engaged with the gear 1c.

A so-called worm gear is formed by the gear 1c and the worm 2a. Since the central axis of the gear 1c coincides with the axis C, the axis of rotation driven by the actuator 2 also coincides with the axis C.
As shown in FIG. 1, the operations of the actuator 2 and the additive supply device 5 are controlled by a control device 6. The control device 6 is an electronic control device configured by a microcomputer, and is provided as an LSI device in which a known microprocessor, ROM, RAM, and the like are integrated.

  First, the control device 6 drives the actuator 2 to control the injection direction of the additive from the injection hole 3. In the present exhaust purification apparatus, the rotation axis of the injector 1 is inclined at a predetermined angle θ with respect to the injection direction of the additive. In other words, the injection direction of the additive is not parallel to the axis C. Therefore, by rotating the injector 1, the direction of the injection hole 3 with respect to the exhaust passage 11 changes, and the injection direction also changes accordingly.

  For example, it is possible to change between the injection direction toward the exhaust passage 11 indicated by arrow B1 in FIG. 2 and the injection direction toward the downstream side wall surface 4a of the accommodating portion 4 indicated by arrow B2. . If the worm 2a is rotationally driven until the gear 1c rotates halfway, the injection direction can be switched from the arrow B1 direction to the arrow B2 direction (or from the arrow B2 direction to the arrow B1 direction).

  In the present embodiment, the injection direction is set in the direction of the arrow B1 at the normal time, and the first predetermined condition that the amount of deposit component deposited on the wall surfaces 4a and 4b of the accommodating portion 4 is estimated to be equal to or greater than the predetermined amount is satisfied. In this case, the injection direction is changed to the arrow B2 direction. Thereafter, the injection direction is returned to the direction of the arrow B1 when the second predetermined condition that the deposit component deposition amount is estimated to be less than the second predetermined amount is satisfied. In addition, the switching conditions of the injection direction of the additive are not limited to this, and may be configured to switch according to the driver's switch operation, for example.

  The control device 6 drives the additive supply device 5 to control cavitation bubbles inside the additive. In the present embodiment, the ultrasonic transducer 5a is driven only when the injection direction of the additive is set in the arrow B2 direction.

[3. flowchart]
A control procedure in the exhaust emission control device will be described with reference to FIG. This flow is repeatedly performed at a predetermined cycle set in advance.

First, in step A10, the control device 6 determines whether or not the first predetermined condition described above is satisfied. That is, here, it is determined whether or not the deposit amount of the deposit component on the wall surfaces 4a and 4b of the accommodating portion 4 is equal to or larger than a predetermined amount. When the first predetermined condition is satisfied, the process proceeds to step A20, and when it is not satisfied, the control is ended as it is.
The content of the first predetermined condition determined here is arbitrary. Since the deposit is formed mainly from unburned fuel, it is preferable to predict or estimate the deposit amount of deposit components based on parameters that may affect the residual amount of unburned fuel in the engine and the injection amount from the injector 1. It is. Such parameters include engine speed, required load, fuel injection amount, intake air amount, air-fuel ratio, exhaust flow rate, valve timing, ignition timing, fuel properties, engine water temperature, outside air temperature, etc. It is not limited. Each of these parameters may be used alone, or a plurality of types may be used in combination by a predetermined function. For example, it is possible to estimate the deposit amount of deposit components by calculating the residual amount of unburned fuel per predetermined minute time based on parameters such as these, and accumulating this amount taking into account the decrease over time It is.

  In subsequent Step A20, the ultrasonic vibrator 5a of the additive supply device 5 is driven by the control device 6, and cavitation bubbles are generated in the additive liquid. Thereafter, in step A30, the control device 6 sets the injection direction of the additive in the direction of the arrow B2, and after the actuator 2 is driven in the subsequent step A40, the additive is injected. In step A40, deposit component peeling and removal control is performed.

  Thereby, as shown to Fig.5 (a), the additive injected from the injector 1 collides directly with the downstream side wall surface 4a. At this time, since cavitation bubbles are generated in the additive liquid, the peeling efficiency of the deposit component is increased by the shock wave generated when the bubble bounces, and the deposit component adhering to the downstream side wall surface 4a is removed. Is done. In general, the deposit component is more likely to flow to the downstream side by the exhaust flow than the injector 1, and therefore, the deposit amount is larger on the downstream side wall surface 4a than on the upstream side wall surface 4b.

On the other hand, as shown in FIG.5 (b), the spray of an additive reflects on the downstream side wall surface 4a, and is supplied also to the upstream side wall surface 4b. Thereby, an additive will be supplied to the whole accommodating part 4, and the deposit component adhering to the upstream side wall surface 4b will also be peeled and removed.
In the subsequent step A50, the control device 6 determines whether or not the second predetermined condition is satisfied. That is, here, it is determined whether or not the amount of deposit component adhering to the wall surfaces 4a and 4b of the accommodating portion 4 is less than the second predetermined amount. If the second predetermined condition is not satisfied, the process proceeds to step A20 to continue the removal of deposit components and the above control is repeated. On the other hand, when the second predetermined condition is satisfied, the process proceeds to Step A60.

  In step A60, the control device 6 stops the driving of the ultrasonic transducer 5a of the additive supply device 5 and the injection of the additive is also stopped. Thereafter, in step A70, the injection direction of the additive is set in the arrow B1 direction. Thus, the actuator 2 is driven. This completes the deposit component removal and removal control performed in step A40.

[4. effect]
As described above, according to the present exhaust purification apparatus, the rotation axis of the injector 1 (that is, the axis C) and the injection direction of the additive (that is, the directions of the arrow B1 and the arrow B2) are set non-parallel to each other. By enabling rotation with respect to the axis C, the injection direction with respect to the exhaust passage 11 can be easily changed. Further, since the injection direction of the additive is not parallel to the rotation axis, the displacement of the injection range becomes larger than the displacement of the position of the injection hole 3 changed by the rotation of the injector 1.

For example, as shown in FIG. 5 (a), the injection range R1 when the deposit component is peeled and removed in step A30 is substantially only the downstream side wall surface 4a, whereas the control is terminated in step A50. The injection range R2 is substantially only the exhaust passage 11. Thus, the injection range covered with one injector 1 can be substantially expanded.
Further, since the injection direction of the additive can be easily changed, the injector 1 originally provided for injecting the additive into the exhaust passage 11 can be used as a mechanism for deposit cleaning. It becomes. That is, a new function such as deposit component removal and removal functions can be provided to the injector 1, and the functions can be used properly according to the situation.

  Further, since the outer shape of the injector 1 is a rotating body shape (that is, a shaft shape) centered on the axis C, and the axis of rotation drive of the actuator 2 coincides with the axis C, the injector 1 is rotated. However, the apparent position does not move. That is, it is not necessary to prepare a space in advance around the outside of the pedestal 11a in anticipation of the movable range of the injector 1, and space efficiency can be improved.

  Moreover, in this exhaust purification apparatus, since the injector 1 is located in the back | inner side of the accommodating part 4 into which exhaust does not flow in directly, the injector 1 can be protected from exhaust heat. Further, since the tip end portion 1a of the injector 1 is slightly inclined toward the downstream side of the exhaust, it is possible to easily supply the additive to the downstream side wall surface 4a of the housing portion 4, and the deposit removing effect. Can be increased.

  Furthermore, in this exhaust purification apparatus, since the additive containing cavitation bubbles is injected, it is possible to further improve the separation and removal performance of deposit components by utilizing the cavitation effect. It should be noted that when the additive is injected to the exhaust passage 11 side, which is outside the accommodating portion 4, the ultrasonic vibrator 5a does not operate, and the additive does not include cavitation bubbles. 7 and the filter 14 are not affected by erosion and the like, and the exhaust purification performance can be ensured.

[5. Modified example]
An exhaust purification device as variable Katachirei in FIG. In addition, about the same structure as what was demonstrated by the above-mentioned embodiment, it shows in a figure using the same code | symbol, and abbreviate | omits description.
In this modification, a part of the exhaust passage 11 is bent at a substantially right angle to form a bent portion 8. The bent portion 8 is provided with a pedestal 11 a and an injector 1. Further, an SCR (Selective Catalytic Reduction) catalyst 7 ′ and a filter 14 are disposed downstream of the bent portion 8.

The engine 10 is provided with a rotation speed sensor 9 for detecting the engine rotation speed Ne. The engine speed Ne detected here is transmitted to the control device 6 '.
The SCR catalyst 7 ′ of this modification is a catalyst using urea [CO (NH ₂ ) ₂ ] as a reducing agent, and reduces NO _x with ammonia (NH ₃ ) generated from hydrolyzed urea. The filter 14 collects PM contained in the exhaust gas, and incinerates the collected PM using NO ₂ remaining in the exhaust gas as an oxidizing agent.

  The injector 1 'supplies urea water as an additive to the SCR catalyst 7'. An axis C of the outer shape of the injector 1 is inclined with respect to each of the exhaust flow direction and the orthogonal direction. Further, the injection direction of the additive from the injection hole 3 of the injector 1 is not parallel to the axis C, and can be changed between the arrow D1 direction and the arrow D2 direction as shown in FIG. It can be done. The arrow D1 points to a substantially center point E of the SCR catalyst 7 ', and the arrow D2 is closer to the inside of the bend than the arrow D1 direction.

The injection direction of such an additive is controlled by the control device 6 '. The control device 6 ′ drives the actuator 2 in accordance with the exhaust flow rate in the exhaust passage 11 to adjust the injection direction of the additive from the injection hole 3. Here, the exhaust flow rate is estimated based on the engine speed Ne.
The control device 6 ′ sets the injection direction in the direction of the arrow D1 when the estimated exhaust flow rate is less than a predetermined flow rate set in advance. On the other hand, when the exhaust flow rate is equal to or higher than the predetermined flow rate, the injection direction is changed to the arrow D2 direction.

  With such a configuration, during normal times when the exhaust gas flow rate is small, it is possible to supply urea water evenly in a range centered on the point E at the approximate center of the SCR catalyst 7 '. On the other hand, when the exhaust gas flow rate is large, the urea water injection direction is changed toward the bent upstream side of the exhaust gas. Therefore, even when the urea water movement locus is pushed away by the exhaust flow, the point is reached when it reaches the SCR catalyst 7 '. Since it becomes a range centering on E, the distribution of urea water becomes uniform. That is, the supply range of the additive pushed away by the exhaust flow can be corrected, and the additive can be supplied to a desired position. Thereby, the concentration deviation of urea water can be prevented, and good purification efficiency can be obtained.

[6. Others]
Having described one embodiment, without being limited to the above embodiments described, it may be modified in various ways without departing from the spirit of it.
In the above-described embodiment, the structure in which the injector 1 itself is rotated by rotationally driving the worm 2a of the actuator 2 is described. However, the specific structure for rotationally driving the injector 1 is not limited to this. You may comprise the front-end | tip part 1a of the injector 1 rotatably with respect to the main body of the injector 1 using a stepping motor. As shown in this embodiment and the modification, when the injection direction of the additive is changed to two directions symmetrical to the axis C, if the injector 1 can be rotated and swung by 180 °, the two directions are formed. The angle can be maximized. Note that in order to achieve the purpose that would leave changing the direction of the injector 1 is suffice actuator 2 that can be rotated 360 ° swinging at most the injector 1 from 180 °, further rotation No driving capability is required.

Although in the above-described embodiments are consistent and the rotary shaft injector 1 according to the axis C and the actuator 2 of the injector 1, this is not a structure of a mandatory. For example, in the case where only the tip 1a of the injector 1 is rotated, it may be considered that these are separated as necessary.
Further, in the above-described modification, the exhaust flow rate is detected based on the engine speed Ne, but instead of this, a flow sensor or the like that detects or estimates the exhaust amount flowing through the exhaust passage 11 directly or indirectly. It is also possible to use it.

  Further, in the above-described embodiment and modification, the exhaust purification device including the additive injection means for supplying the additive to the oxidation catalyst 7 and the SCR catalyst 7 'has been exemplified. However, to the exhaust purification system using other additives. Is also possible. Moreover, although the above-mentioned embodiment applies this invention to the exhaust system of the vehicle provided with the diesel engine 10, application to the vehicle provided with the gasoline engine is also possible.

1 is a schematic configuration diagram of an exhaust system of an internal combustion engine in a vehicle to which an exhaust emission control device according to an embodiment is applied. It is typical sectional drawing which shows the whole structure of this exhaust gas purification apparatus. It is sectional drawing (AA sectional drawing of FIG. 2) of the injector in this exhaust gas purification apparatus. It is a flowchart for demonstrating the control content of this exhaust gas purification apparatus. It is typical sectional drawing for demonstrating the effect | action of this exhaust gas purification apparatus, (a) shows the state which injected the additive toward the wall surface of the accommodating part, (b) reflected the additive on the wall surface. It shows the state. FIG. 6 is a schematic configuration diagram of an exhaust system of an internal combustion engine in a vehicle to which an exhaust emission control device as a modification is applied. It is typical sectional drawing which shows the whole structure of the exhaust gas purification apparatus as a modification.

Explanation of symbols

1,1 'injector (additive injection means)
1a distal end 1b base end 1c gear 2 actuator (rotation drive means)
2a Worm 2b Motor 3 Injection hole 4 Housing part 4a Downstream side wall surface 4b Upstream side wall surface 5 Additive supply device 5a Ultrasonic vibrator 5b Supply pump 6, 6 'Control device 7 Oxidation catalyst ( exhaust purification catalyst )
7 'SCR catalyst 8 Bent part 9 Rotational speed sensor (exhaust flow rate detection means)
10 Engine 11 Exhaust passage 11a Pedestal 12 Intake passage 13 Turbocharger 14 Filter

Claims (3)

Formed for jetting direction additives like shaft having a central axis inclined at a predetermined angle, and additive injection means for injecting the additive into the exhaust passage of the internal combustion engine,
A rotational drive means for rotationally driving the additive injection means about a rotation axis coinciding with the central axis of the additive injection means ;
One end is opened to the wall surface of the exhaust passage and communicates with the exhaust passage, and the other end is provided with a storage portion in which the additive injection means is disposed.
The additive injecting means injects the additive from the inside of the housing portion to the outside of the housing portion;
The exhaust emission control device, wherein the rotation driving means rotationally drives the additive injection means to change the injection direction of the additive to the wall surface direction of the housing portion . The additive injection means is oriented to be inclined with respect to each of the exhaust flow direction and the direction perpendicular to the flow direction, and one end side for injecting the additive is downstream of the exhaust passage from the other end side. The exhaust emission control device according to claim 1 , wherein the exhaust gas purification device is disposed so as to be located at a position. An ultrasonic vibrator for generating bubbles in the additive ejected from the additive ejecting means;
The apparatus further comprises a control device that drives the ultrasonic transducer when the injection direction of the additive is changed to the wall surface direction of the container by the rotation driving means. The exhaust emission control device according to 1 or 2 .

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