JP2007187132A - Exhaust gas purification device - Google Patents

Abstract

The present invention provides a novel means capable of dealing with various operating conditions without using a special medium for particle condensation in an exhaust gas purifying apparatus utilizing the centrifugal separation action of a cyclone collector.
A discharge electrode and a honeycomb structure are installed upstream of a cyclone collector. The PM in the exhaust gas is charged by the discharge from the discharge electrode 22, is adsorbed by the honeycomb structure 24 by electrostatic force, and is temporarily held on the partition wall surface and the front end surface. Since the PM deposited on the honeycomb structure 24 increases in fluid resistance as the particle size increases, it is separated from the holding means by the exhaust gas flow and supplied to the cyclone collector 30. Since the particle size of PM is increased at the time of adsorption, collection by the cyclone collector 30 is promoted.
[Selection] Figure 1

Description

  The present invention relates to an exhaust gas purification apparatus that is used in an exhaust system of an internal combustion engine and removes a predetermined substance contained in exhaust gas.

  As a technique for removing particulate matter (PM) contained in exhaust gas from an internal combustion engine, Patent Document 1 discloses a device that uses the centrifugal action of a cyclone collector. Patent Document 2 discloses an apparatus for aggregating particulate matter by supplying adsorbent powder or binder droplets charged by an electrode to the front stage of a cyclone collector.

JP 2004-316513 A Japanese Patent Laid-Open No. 2003-190838

  However, in the apparatus of Patent Document 1, collection becomes difficult when the particle size of PM is small or when the flow velocity is small. In addition, while the apparatus of Patent Document 2 can cope with various operating conditions regarding particle size and flow velocity, there is a limit to the amount of adsorbable powder and binder droplets that can be supplied, so that a long cruising distance can be required. Is not necessarily preferable.

  Therefore, an object of the present invention is to provide a novel means that can cope with various operating conditions without using a special medium for particle condensation in an exhaust gas purification apparatus that uses the centrifugal action of a cyclone collector. There is to do.

  A first aspect of the present invention is an exhaust gas purifying apparatus in which a cyclone collector is installed in an exhaust passage from an engine, and in the exhaust passage on the upstream side of the cyclone collector, particles in exhaust gas An exhaust gas purifying apparatus comprising: a charging unit for charging a substance; and a holding unit for adsorbing and temporarily holding particulate matter in the exhaust gas.

  In the first aspect of the present invention, the charging unit charges the particulate matter in the exhaust gas, and the holding unit adsorbs and temporarily holds the particulate matter in the exhaust gas. Since the particulate matter deposited on the holding means increases in fluid resistance as the particle size increases, it is separated from the holding means by the exhaust gas flow and supplied to the cyclone collector. And since the particle size of the particulate matter is increased during the adsorption, collection by the cyclone collector is promoted. As described above, according to the present invention, the particulate matter itself is charged in order to increase the particle size of the particulate matter, so that it can cope with various operating conditions without using a special medium for particle condensation. It becomes possible.

  According to a second aspect of the present invention, there is provided an exhaust gas purifying apparatus characterized by further comprising a control means for controlling the charging means based on a predetermined physical quantity indicating the state of the engine.

  In the second aspect of the present invention, since the control means for controlling the charging means is further provided based on a predetermined physical quantity indicating the state of the engine, it is possible to perform an appropriate operation according to the state of the engine.

  The third aspect of the present invention is an exhaust gas purification apparatus further comprising a flow rate changing means for changing a flow rate of the exhaust gas flowing into the cyclone collector.

  In 3rd this invention, it becomes possible to make it the flow rate suitable for collection by changing the flow rate of the waste gas which flows into a cyclone collector.

  According to a fourth aspect of the present invention, there is provided an exhaust gas purifying apparatus further comprising a flow rate control means for controlling the flow rate changing means based on at least one of a temperature and a flow rate of the exhaust gas.

  In the fourth aspect of the present invention, since the flow rate control unit controls the flow rate changing unit based on at least one of the temperature and the flow rate of the exhaust gas, it is possible to perform an appropriate operation according to the state of the exhaust gas. .

  According to a fifth aspect of the present invention, the flow velocity changing means can change a cross-sectional area of the exhaust passage, the flow velocity control means controls the flow velocity changing means based on the flow rate of the exhaust gas, and the flow rate of the exhaust gas is The exhaust gas purifying apparatus is characterized by gradually increasing the cross-sectional area of the exhaust passage as it is larger.

  In the fifth aspect of the present invention, the flow rate control means gradually increases the cross-sectional area of the exhaust passage as the flow rate of the exhaust gas in the exhaust passage increases, so that the flow rate of the exhaust gas supplied to the cyclone collector is suitable for collection. It becomes possible to increase the speed.

  A sixth aspect of the present invention is an exhaust gas purification apparatus further comprising an oxidant supply means for supplying an oxidant to the cyclone collector.

  In 6th this invention, the oxidation of the particulate matter collected by the cyclone collector can be accelerated | stimulated by the effect | action of an oxidizing agent.

  A seventh aspect of the present invention is an exhaust gas purifying apparatus characterized in that a catalytic substance is disposed between a lower end portion of a separation cylinder in the cyclone collector and a particulate matter container in the cyclone collector. is there.

  In the seventh aspect of the present invention, since the catalytic substance is disposed between the lower end of the separation cylinder in the cyclone collector and the particulate matter storage part, the exhaust gas can be purified more suitably, and the particulate matter In addition to being able to reduce the oxidation temperature, when a separate catalyst device is provided after the cyclone collector, the amount of catalyst in the separate catalyst device can be suppressed.

  In an eighth aspect of the present invention, the oxidant supply means includes a supply pipe communicating with the inside of the separation cylinder in the cyclone collector, and the supply pipe is directed in the same direction as the flow direction in the separation cylinder. It is an exhaust gas purification apparatus characterized by being installed.

  In the eighth aspect of the present invention, since the supply pipe of the oxidant supply means is connected to the inside of the separation cylinder, the trapping accompanying the increase in the atmospheric pressure in the particulate matter container is compared with the case where the oxidant is supplied to the outside of the separation cylinder. A decrease in rate can be suppressed. In addition, since the oxidant can be expected to flow along the inner peripheral surface of the separation cylinder, the oxidation of the particulate matter can be promoted.

  According to a ninth aspect of the present invention, there is provided an exhaust gas purifying apparatus further comprising a charge removing means in the vicinity of the particulate matter containing portion.

  In the ninth aspect of the present invention, the floating of PM can be suppressed by the charge removing means, and the purification can be promoted. As the charge removing means, it is preferable to use a conductor as in the tenth aspect of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. An exhaust gas treatment apparatus 1 of the present embodiment shown in FIG. 1 is suitable when applied to a vehicle, and in order to purify exhaust gas discharged from a combustion chamber of an engine 10 that is a diesel engine, the engine 10 Is incorporated into the exhaust passage 12. The engine 10 can change the fuel injection amount and the valve timing in accordance with the state of the vehicle including the operation state of the user. In the exhaust passage 12 from the engine 10, a three-way catalyst 20, a cyclone collector 30, a NOx catalyst 40, and an oxidation catalyst 50 are installed in this order from the upstream side. The downstream side of the oxidation catalyst 50 is open to the atmosphere via a silencer (not shown). Between the three-way catalyst 20 and the cyclone collector 30, the discharge electrode 22 and the honeycomb structure 24 are installed in this order.

  As the three-way catalyst 20, for example, a noble metal catalyst in which noble metal fine particles such as platinum, rhodium and palladium are supported on a coating layer such as alumina formed on the surface of the ceramic honeycomb structure is preferably used.

  The discharge electrode 22 is installed in order to charge PM in exhaust gas by the discharge accompanying application of a high voltage. The honeycomb structure 24 is made of a ceramic material, and specifically, cordierite, SiC (silicon carbide), or the like is preferably used. The honeycomb structure 24 has a large number of parallel partition walls formed along the flow direction of the exhaust gas, and the spaces surrounded by these partition walls form exhaust gas paths that communicate with each other in the front-rear direction.

  The cyclone collector 30 is a device that captures particles in the gas by centrifugal force generated with a vortex flow generated by the inflowing gas. As shown in FIG. 2 and FIG. Inside the body 31, there is a separation cylinder 32 which is reduced in diameter toward the lower side and opened at the lower end. The separation cylinder 32 has a cylindrical inlet pipe 32a installed at the upper end portion thereof in the tangential direction. On the outer periphery of the separation cylinder 32, plate-like separators 31a and 31b that divide the interior of the exterior body 31 vertically are provided. A concave PM housing part 33 is formed on the bottom surface of the exterior body 31.

A catalyst substance is supported on the surface of the PM housing portion 33, that is, on the bottom surface of the exterior body 31. As the catalyst material, noble metals such as Pt / Pd, pt-supported zirconia, ag-supported zirconia, or MnO ₂ , Fe ₂ O ₂ , NiO, etc. suitable for use of O 3 can be used.

  A flow rate control valve 34 is installed at the inlet of the cyclone collector 30. The flow rate control valve 34 can change a substantial sectional area of the exhaust passage 12 (that is, a value obtained by dividing the volume flow rate by the flow rate). The flow rate control valve 34 has a flap-shaped valve body 34a shown in FIGS. 4 to 6, and the valve body 34a is a substantially disc-shaped body 35 whose end is bent downstream, and the body 35. And a deflection plate 36 pointing downward at the tip fixed to the upstream surface. The main body 35 is provided with a through hole 35a for defining a minimum flow rate when fully closed. The valve body 34a is driven in a turning direction around a shaft 35b by a step motor 37, and the opening degree is controlled by the ECU 25.

In order to supply the oxidant to the PM storage unit 33 of the cyclone collector 30, an ozone generator 60 is installed. The ozone generator 60 includes a generally cylindrical container, a generally cylindrical outer peripheral electrode disposed inside the container, and a thin rod-shaped center electrode inserted so as to be positioned on the longitudinal axis of the outer peripheral electrode. And a pump for discharging the treated gas. The ozone generator 60 radicalizes the outside air taken in from the outside by a discharge accompanying application of a high voltage to generate O ₃ . The discharge side of the ozone generator 60 is connected to the exterior body of the cyclone collector 30 via an ozone supply pipe 61.

As the NOx catalyst 40, a selective reduction catalyst (SCR) can be used. The selective reduction catalyst is a catalyst that forms a gas mixture by adding a reducing agent to NO ₂ in the exhaust gas, and converts NOx to N ₂ by the gas mixture. As the selective reduction catalyst, a gallium oxide-alumina catalyst can be used. As the reducing agent, in addition to ammonia / urea, a fuel (light oil) containing HC can be used.

The oxidation catalyst 50 is a catalyst device that treats substances such as HC, CO, NOx, etc. to make H ₂ O, CO ₂ , N _2, etc., and is used as a so-called sweeper in this embodiment. As the catalyst material of the oxidation catalyst 50, for example, Pt / CeO ₂ , Mn / CeO ₂ , Fe / CeO ₂ , Ni / CeO ₂ , Cu / CeO ₂ or the like can be used.

  A high voltage power source 23 for applying a high voltage to the discharge electrode 22 includes an inverter circuit, a transformer, a diode for rectification, and the like. The high voltage power source 23 is connected to a direct current power source (not shown) for supplying power thereto, for example, an in-vehicle battery.

  An electronic control unit (hereinafter referred to as ECU) 25 that controls the entire apparatus includes a CPU, a ROM, a RAM, an input / output port, a non-volatile memory, and the like (not shown). The input port of the ECU 25 includes a crank angle sensor 41 installed in the vicinity of the crankshaft of the engine 10, a throttle opening sensor 42 provided in the vicinity of the throttle valve, an air flow meter 43 provided on the intake side, and engine cooling water. Various sensors such as a water temperature sensor 44 for detecting the temperature of the water are connected via an A / D converter. In the ECU 25, each value is calculated based on these detection signals indicating the state of the engine 10, and is processed as described later.

  In addition to the high voltage power supply 23 described above, a step motor 37 for driving the flow rate control valve 34 and an ozone generator 60 are connected to the output port of the ECU 25 via a D / A converter and a drive circuit. Yes.

  Various functions and reference values are stored in advance in the ROM of the ECU 25 together with various control programs for controlling the fuel injection amount and valve timing of the engine 10. In the ROM of the ECU 25, the discharge voltage map for setting the voltage value of the discharge electrode 22, the flow rate control valve opening map for setting the opening of the flow rate control valve 34, and the ozone supply amount by the ozone generator 60 are stored. An ozone supply amount map for setting is stored in advance.

  In the discharge voltage map, for example, the PM generation amount calculated based on engine operating conditions such as engine speed, fuel injection amount, intake air amount, engine water temperature, and valve timing, and the target voltage value of the discharge electrode 22 are associated with each other. The optimum voltage value of the discharge electrode 22 can be calculated by referring to the map by the PM generation amount. In the map, the target opening degree of the discharge electrode 22 is set to be larger as the PM generation amount is larger. In the ozone supply amount map, the PM generation amount, the target voltage value of the ozone generator 60 and the pump speed are associated with each other, and the optimum ozone generator 60 is referred to by referring to the map by the PM generation amount. The target voltage value and the pump speed can be calculated. In the map, the target voltage value and the pump speed are set to increase as the PM generation amount increases.

  The flow rate control valve opening map is obtained by associating the exhaust gas flow rate calculated based on engine operating conditions such as the engine speed, the fuel injection amount, and the intake air amount with the target opening of the flow rate control valve 34, for example. The optimum target opening degree of the flow velocity control valve 34 can be calculated by referring to the map by the exhaust gas flow rate. As shown in FIG. 7, the map is set so that the target opening degree of the flow rate control valve 34 increases as the exhaust gas flow rate increases (that is, the cross-sectional area of the exhaust passage gradually increases). In order to calculate the target opening degree of the flow rate control valve 34, other parameters such as engine water temperature and exhaust temperature may be taken into consideration.

  The ECU 25 calculates and outputs a drive pulse signal (gate signal) and a voltage instruction signal for driving the inverter circuit of the high voltage power supply 23. In the high voltage power source 23, a DC voltage from the DC power source is converted into an AC voltage by an inverter circuit, boosted by a transformer, rectified by a diode, and output, whereby a voltage is applied to the discharge electrode 22. .

  The operation of the present embodiment configured as described above will be described below. In the ECU 25 in the present embodiment, control target values of the discharge electrode 22, the ozone generator 60, and the flow rate control valve 34 are calculated from the above-described maps based on the detection values of the sensors. Each device is controlled to match the control target value.

  When the exhaust gas containing PM treated by the three-way catalyst 20 reaches the vicinity of the discharge electrode 22, the PM in the exhaust gas is charged by the discharge from the discharge electrode 22, and is adsorbed on the honeycomb structure 24 by electrostatic force. , Temporarily held on the partition wall surface or front end surface. Since the PM deposited on the honeycomb structure 24 increases in fluid resistance as the particle size increases, it is separated from the holding means by the exhaust gas flow and supplied to the cyclone collector 30. And since the particle size of PM is increased at the time of adsorption | suction, the collection by the cyclone collector 30 will be accelerated | stimulated.

  The flow rate control valve 34 provided at the inlet portion of the cyclone collector 30 is controlled by the ECU 25 and is substantially proportional to the exhaust gas flow rate, ie, a substantial cross-sectional area of the flow path (that is, a value obtained by dividing the volume flow rate by the flow rate). ) Is changed. As a result, when the exhaust gas flow rate is low, the cross-sectional area of the flow path is narrowed, and the decrease in the exhaust gas flow velocity in the separation cylinder 32 of the cyclone collector 30 is suppressed.

  The exhaust gas introduced into the separation cylinder 32 from the inlet pipe 32a of the cyclone collector 30 forms a free vortex and becomes a downward swirling flow (arrow a) shown in FIG. 3, and the centrifugal force causes PM in the exhaust gas. Falls naturally along the inner wall of the separation cylinder 32 (arrow b) and is accommodated in the PM accommodating portion 33. Further, the clean gas after the PM is separated exits from the cyclone collector 30 through the discharge cylinder 32b and is discharged downstream by the upward flow (arrow c) generated in the middle of the separation cylinder 32. .

  The exhaust gas discharged from the cyclone collector 30 is discharged outside through the NOx catalyst 40 and the oxidation catalyst 50.

  As described above, in the present embodiment, since the PM itself is charged to increase the particle size of the PM, it is possible to cope with various operating conditions without using a special medium for particle condensation. Become.

  In the present embodiment, since the ECU 25 controls the discharge electrode 22 based on a predetermined physical quantity indicating the state of the engine 10, it is possible to perform an appropriate operation according to the state of the engine 10.

  Moreover, in this embodiment, since the flow rate of the exhaust gas flowing into the cyclone collector 30 is changed by the flow rate control valve 34, the exhaust gas flow rate is low by setting the flow rate to be suitable for collection by the cyclone collector 30. A sufficient centrifugal force in the cyclone collector 30 can be obtained even at a low speed.

  Further, in the present embodiment, the ECU 25 controls the flow rate control valve 34 based on at least one of the exhaust gas temperature and the flow velocity, so that an appropriate operation according to the state of the exhaust gas can be performed.

  Further, in the present embodiment, the flow rate control valve 34 gradually increases the cross-sectional area of the exhaust passage 12 as the flow rate of the exhaust gas in the exhaust passage 12 increases, so that the flow rate of the exhaust gas supplied to the cyclone collector 30 is collected. It becomes possible to make it suitable speed.

  Moreover, in this embodiment, the oxidation of PM collected by the cyclone collector 30 can be accelerated | stimulated by the effect | action of ozone as an oxidizing agent.

  In the present embodiment, since the deflecting plate 36 having the tip facing downward is provided on the upstream side surface of the flow rate control valve 34, the swirl flow in the separation cylinder 32 can be promoted.

  In the above embodiment, the present invention has been described with a certain degree of concreteness, but various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention described in the claims. It must be understood that. That is, the present invention includes modifications and changes that fall within the scope and spirit of the appended claims and their equivalents. For example, the input variables for setting the voltage value of the discharge electrode 22, the opening degree of the flow rate control valve 34, and the ozone supply amount by the ozone generator 60 are not limited to those exemplified above. In the above embodiment, the voltage applied to the discharge electrode 22 is variable, but may be a fixed value.

  In the above embodiment, the opening degree of the flow rate control valve 34 is controlled by the ECU 5 based on the engine operating conditions. However, the flow rate control valve is always urged by an elastic body such as a spring. May be. In this case, the flow rate control valve is always urged toward the upstream side, and can be opened substantially in proportion to the exhaust gas flow rate by installing the flow rate control valve so as to open toward the downstream side by the exhaust gas flow. become.

  Further, in the above embodiment, the catalytic substance is supported on the surface of the PM accommodating portion 33 of the cyclone collector 30, that is, the bottom surface of the exterior body 31, but instead of or in addition to such a configuration. As shown in FIG. 8, a honeycomb structure 51 supporting a catalyst material may be disposed between the lower end portion of the separation cylinder 32 in the cyclone collector 30 and the PM accommodating portion 33. Suitable catalyst materials in this case are the same as those in the above embodiment. According to such a configuration, the exhaust gas can be more suitably purified, the oxidation temperature of the particulate matter can be reduced, and the amount of catalyst in the catalytic device downstream from the cyclone collector 30 is suppressed. be able to. Instead of the configuration in which the honeycomb structure 51 supporting the catalyst material is installed as described above, the honeycomb structure 51 is not used, but the inner wall surface of the outer casing 31 and the lower end portion of the separation cylinder 32 and the PM housing A catalytic substance may be supported in a region between the portion 33.

  Further, in the above embodiment, the ozone supply pipe 61 is fixed to the exterior body 31 and ozone is supplied toward the PM accommodating portion 33. Instead of such a configuration, a modification example shown in FIG. Like the cyclone collector 130, the ozone supply pipe 61 may be fixed to the separation cylinder 32 and ozone may be supplied into the separation cylinder 32. Further, as shown in FIG. 10, it is preferable to install the ozone supply pipe 61 in the tangential direction of the separation cylinder 32. In this case, since ozone can be expected to flow along the inner peripheral surface of the separation cylinder 32, the oxidation of PM and other substances in the exhaust gas can be promoted, and the PM storage outside the separation cylinder 32 can be promoted. Compared with the case where ozone is supplied to the unit 33, it is possible to suppress a decrease in the PM collection rate accompanying an increase in the atmospheric pressure in the PM storage unit 33.

  Further, when a certain amount of PM accumulates in the PM housing portion 33 of the cyclone collector, the PMs repel each other due to the charged electric charge, and the PM falling from the separation cylinder 32 does not settle in the exterior body 31, The phenomenon of staying in the shape can occur. In order to suppress such a phenomenon, as shown in FIG. 9, a conductive screen 70 as a charge removing unit may be installed in the vicinity of the PM accommodating portion 33.

  As shown in FIGS. 11 and 12, the conductive screen 70 includes an annular outer frame 71 and a conductive net 72 disposed therein. A large number of substantially hemispherical protrusions 73 are provided on the upper and lower surfaces of the outer frame 71. The outer frame 71, the conductive net 72, and the protrusion 73 are all made of a conductor such as stainless steel. As shown in FIG. 13, the exterior body 131 can be divided vertically, and the flange 132a of the upper part 131a and the flange 132b of the lower part 131b are fastened by bolts (not shown). A ring 133 is fixed between the flanges 132a and 132b. The conductive screen 70 is accommodated between the ring 133 and the lower portion 131b via a predetermined gap, and is thereby held movably by the exterior body 131.

  According to such a configuration, it is possible to suppress a phenomenon in which PM that has fallen from the separation cylinder 32 is neutralized by contacting the conductive screen 70 and stays in a cloud shape in the exterior body 31. Further, since the conductive screen 70 is held movably in the exterior body 131, the accumulation of PM on the conductive screen 70 is suppressed by the vibration of the conductive screen 70 caused by vibration during traveling or engine operation. Can do. In order to vibrate the conductive screen 70, an actuator such as a motor or a solenoid may be installed and driven at an appropriate timing.

  As shown in FIG. 14, the cyclone collector 230 may have a plurality of separation cylinders 232 in a single exterior body 231.

  As shown in FIG. 15, the cyclone collector 330 may be formed inside the silencer 331.

  Further, the position in the exhaust path where the combination of the charging means / holding means and the cyclone collector is installed is not limited to that in the above-described embodiment. For example, as shown in FIG. There may be. In this case, the configuration of the cyclone collector 430 may be any of the above-described modifications.

  In the above embodiment, the discharge electrode 22 is used as the charging means. However, in the present invention, any structure that promotes the charging of the PM itself, such as a charging member for promoting the charging of the PM by friction using the exhaust gas flow. Various other charging means can be used. Moreover, it is good also as a structure which replaces with the structure which produces | generates ozone from external air, and produces | generates from waste gas, or the structure supplied from a tank. In the above embodiment, a high DC voltage is applied to the discharge electrode 22. However, the type and waveform of the applied voltage to the discharge electrode 22 may be any one such as an alternating pulse. Further, as the types of the three-way catalyst and the selective reduction catalyst, various other known ones can be widely used in addition to those mentioned in the above embodiment, and such modifications are also included in the category of the present invention.

It is a schematic block diagram which shows the exhaust gas purification apparatus of embodiment of this invention. It is a schematic plan view which shows a cyclone collector. It is a schematic side view which shows a cyclone collector. It is a schematic plan view which shows the flow-rate control valve of a cyclone collector. It is a top view which shows a flow rate control valve. It is a front view showing a flow rate control valve. It is a graph which shows the example of a setting of the flow velocity control valve opening degree map. It is a schematic side view which shows the principal part of the modification of a cyclone collector. It is a schematic side view which shows another modification of a cyclone collector. It is a plane sectional view showing the important section of the cyclone collector of FIG. It is a top view which shows an electroconductive screen. It is a partially cutaway side view showing a conductive screen. It is a partially cutaway side view showing the main part of the installed state of the conductive screen. It is a schematic perspective view which shows the modification of a cyclone collector, and has a some isolation | separation cylinder in the single exterior body. It is a schematic side view which is a modification of a cyclone collector and shows what was formed in the silencer. It is a schematic block diagram which shows the modification which installed the combination of the charging means / holding means and the cyclone collector downstream from the NOx catalyst.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas processing apparatus 10 Engine 12 Exhaust passage 22 Discharge electrode 23 High voltage power supply 24 Honeycomb structure 25 ECU
30, 130, 230, 330, 430 Cyclone collector 32, 232 Separating cylinder 34 Flow rate control valve 37 Step motor

Claims (10)

An exhaust gas purification apparatus in which a cyclone collector is installed in an exhaust passage from an engine,
Charging means for charging particulate matter in the exhaust gas in the exhaust passage upstream of the cyclone collector, and holding means for adsorbing and temporarily holding the particulate matter in the exhaust gas And an exhaust gas purifying apparatus. The exhaust gas purification device according to claim 1,
An exhaust gas purifying apparatus, further comprising a control means for controlling the charging means based on a predetermined physical quantity indicating the state of the engine. The exhaust gas purifying apparatus according to claim 1 or 2,
An exhaust gas purification apparatus further comprising a flow rate changing means for changing a flow rate of the exhaust gas flowing into the cyclone collector. The exhaust gas control device according to claim 3,
An exhaust gas purifying apparatus, further comprising a flow rate control unit that controls the flow rate changing unit based on at least one of a temperature and a flow rate of the exhaust gas. The exhaust gas purification device according to claim 4,
The flow rate changing means can change the cross-sectional area of the exhaust passage,
The exhaust gas purification apparatus, wherein the flow rate control unit controls the flow rate changing unit based on a flow rate of exhaust gas and gradually increases a cross-sectional area of the exhaust passage as the flow rate of the exhaust gas increases. An exhaust gas purification apparatus according to any one of claims 1 to 5,
An exhaust gas purification apparatus further comprising an oxidant supply means for supplying an oxidant to the cyclone collector. The exhaust gas purifying apparatus according to claim 6,
An exhaust gas purification apparatus, wherein a catalyst material is disposed between a lower end portion of a separation cylinder in the cyclone collector and a particulate matter storage portion in the cyclone collector. The exhaust gas purifying device according to claim 6 or 7,
The oxidant supply means includes a supply pipe that communicates with the inside of the separation cylinder in the cyclone collector, and the supply pipe is installed in the same direction as the flow direction in the separation cylinder. Exhaust gas purification device. An exhaust gas purifying apparatus according to any one of claims 6 to 8,
An exhaust gas purifying apparatus further comprising a charge removing means in the vicinity of the particulate matter containing portion. An exhaust gas purification device according to claim 9,
The exhaust gas purifying apparatus, wherein the charge removing means is made of a conductor.

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