KR20010019243A - Controlling device of catalyst converter for purification of exaust gas for automobiles - Google Patents

Abstract

PURPOSE: A catalyst converter control device is provided to install rotatably a switch forming a heat transferring plate and an isolation plate on a hole rear portion of hydrocarbon adsorption unit for controlling a fluid of exhaust gas without mounting an air converter equipping a separate pump and to improve an activation of a second catalyst unit. CONSTITUTION: A catalyst converter control device comprises a hole(120) formed in a cell center; an isolation plate(210) mounted on an inner hole by forming rotatably to isolate the hole; a heat transferring plate(220) engaging with the isolation plate crossly; plural through holes(221) formed of a heat transferring wire heated with supplied power; a driving rod(230) installed through a rearward cell(110) of a hydrocarbon adsorption unit(100) by engaging with a joining unit(211) of the isolation plate and the heat transferring plate and protruded with one end into outside of a catalyst converter cover(500) for connecting with a rotation transferring unit; and a driving unit(600) rotating the driving rod. The hydrocarbon desorbed after absorbed into the hydrocarbon absorption unit in cold starting is purified efficiently by improving an activation of a second catalyst unit due to an inlet into the second catalyst unit of the exhaust gas.

Description

Controlling device of catalyst converter for purification of exaust gas for automobiles

The present invention relates to an apparatus for regulating a catalytic converter for exhaust gas purification of a vehicle, and more particularly, to remove an air converter from an exhaust gas purifying catalytic converter and to alternately combine a heat transfer plate and a blocking plate of a simple structure, and to rotate the hydrocarbon by a driving rod. It is installed behind the hole of the adsorption unit, and then opens and closes the blocking plate to control the flow of exhaust gas, and by using the heat transfer plate to promote the activation of the second catalyst unit, exhaust of automobiles that can reduce hydrocarbon emissions generated during initial cold start It is to provide a catalytic converter regulator for gas purification.

In general, air pollutants generated from automobiles can be divided into exhaust gas from exhaust pipe and broby gas and evaporative gas from other parts.The emission control system is divided into combustion control method and three-way catalyst. It is divided in a manner.

Combustion control method is mainly based on engine modification (EM) and exhaust recirculation (EGR) is applied to reduce NOｘ (nitrogen oxide), and the remaining CO (carbon monoxide), HC (hydrocarbon) is oxidized catalyst or Purification by secondary air injection to the exhaust manifold.

In addition, the three-way catalyst method has been made possible by the advancement of the electronic control technology that maintains the durability of the O₂ (oxygen) sensor and catalyst and controls the air-fuel ratio. The way is mainstream.

On the other hand, catalysts are used to convert harmful components CO, HC and NOｘ in the exhaust gas into harmless substances, and the basic factors of the catalytic reaction are reactant concentration, temperature and space velocity (gas flow rate / catalyst capacity per unit), In order to obtain high reaction efficiency, it is necessary to appropriately control the conditions of these factors.

In addition, the balance of the concentration of oxygen and the concentrations of CO, HC, and H2 is important in terms of the factors of the reactant concentration. Therefore, the above-described secondary air introduction system or closed loop fuel system is used in combination to reduce the exhaust gas composition. It is often controlled.

Looking at the type of such a catalyst is roughly divided into pellet type and monolith (honeycomb) type according to the shape. The pellet type is a catalyst having a catalyst component in a spherical or columnar carrier of about 2 to 4 mm and used in a metal container.

In addition, the monolith type has a catalyst on the surface of an integrally formed carrier made of ceramic or heat resistant steel foil having a plurality of gas flow holes (cells). The functions of such catalysts are classified into three types: oxidation catalysts, reduction catalysts, and three-way catalysts.

Of these, the most common three-way catalysts presently function to simultaneously perform oxidation reactions of CO and HC and reduction reactions of NOｘ. This catalyst strictly controls the air-fuel ratio of the exhaust gas to a narrow range before and after the theoretical air-fuel ratio. All three of CO, HC, and NOｘ can obtain high purification rates.

An area in which all three components can obtain a high purification rate at the same time is called an air-fuel ratio window. The width of the window is one of the indicators of the three-way catalytic performance.

In addition, the three-way catalyst is required to control the exhaust gas air-fuel ratio by a complex control system such as a closed loop fuel system, which is currently most commonly employed because it can cope with a strict regulation value and is also fuel-efficient.

The apparatus for oxidizing and reducing the components of the exhaust gas by installing the catalyst as described above is called a catalytic converter (catalyst converter), and is mainly installed in the middle of the engine exhaust pipe.

In addition, CO, HC, and NOｘ contained in the exhaust gas are oxidized / reduced to CO₂ (carbon dioxide), H₂O (water), O₂ (oxygen), N₂ (nitrogen), and released into the atmosphere. Is classified into a pellet type catalytic converter using a pellet type catalyst and a monolith type catalytic converter using a monolith type catalyst.

Looking at the structure and operation of the monolithic catalytic converter currently most commonly used through the drawings as follows.

1 and 2 are perspective views showing cross-sectional views of a conventional monolithic catalytic converter. As shown in the drawing, the catalytic converter includes a first catalyst unit 30, a hydrocarbon adsorption unit 10, and a second catalyst unit 40. It is composed of

In addition, an air converter 20 having a pump (not shown in the drawing) is installed between the first catalyst part 30 and the hydrocarbon adsorption part 10. The air converter 20 has one end connected to the outside. The other end is inserted into the hole 12 of the hydrocarbon adsorption unit 10.

The hydrocarbon adsorption unit 10 is composed of a cylindrical cell 11 and a hole 12, which is a cylindrical hollow formed in the center of the cell 11, and at the cold start, the air converter 20 is operated as shown in FIG. 1. The hydrocarbon is adsorbed while the exhaust gas does not pass through the hole 12 but passes through the cell 11.

Then, when the engine is warmed up, the operation of the air converter 20 is stopped, and as shown in FIG. 2, almost the majority of the exhaust gas passes through the hole 12 formed in the center of the second catalyst part ( 40, the second catalyst unit 40 is heated by the heat of the exhaust gas itself, and the hydrocarbon adsorbed to the cell 11 of the hydrocarbon adsorption unit 10 during cold start is gradually desorbed and purified by the second catalyst unit 40. will be.

Therefore, in the conventional catalytic converter, the exhaust gas passes through the second catalyst portion 40 during cold start before the second catalyst portion 40 is activated enough to purify the exhaust gas, and the exhaust gas is not purified. In order to prevent the air pollution from being increased, a separate air converter 20 is installed and the air converter 20 is driven to exhaust the exhaust gas to the second catalyst part 40 through the hole 12. Prevented.

However, such a conventional catalytic converter system has to operate the air converter 20 having a pump for the exhaust gas conversion during the initial cold start, it was necessary to install the air converter 20 separately, and thus the air converter 20 When the exhaust gas is switched by using the flow rate passing through the cell 11 of the hydrocarbon adsorption unit 10 varies according to the amount of air to be converted, there is a problem that precise air switching is required.

Accordingly, an object of the present invention is to control the flow of exhaust gas without installing an air converter having a pump separately by rotatably installing a switch composed of a heat transfer plate and a blocking plate at the rear of the hole of the hydrocarbon adsorption unit, and activates the second catalyst unit. The present invention provides a catalytic converter for purifying exhaust gas of automobiles.

The object of the present invention is formed of a plurality of through holes formed by a blocking plate for rotating the exhaust gas blocking the exhaust gas in the hole formed through the hydrocarbon adsorption portion of the catalytic converter to block the exhaust gas, the heating wire is heated when power is applied. The heat exchanger plate and the heat exchanger plate and the heat exchanger plate are alternately coupled to each other, and the heat exchanger plate and the heat exchanger plate are alternately coupled to each other. It is achieved by comprising a drive rod and a drive means connected to the rotation transfer means of the drive rod to rotate the drive rod.

The present invention removes the air converter from the catalytic converter for exhaust gas purification, simply combines the heat transfer plate and the blocking plate, and is installed rotatably in the hole of the hydrocarbon adsorption unit to control the flow of the exhaust gas by opening and closing the blocking plate, heating the heating plate By promoting the activation of the second catalyst portion is to reduce the hydrocarbon emissions generated during the initial cold start can achieve the above object effectively.

1 is a perspective view showing a cross-section of the catalytic converter for exhaust gas purification during cold start according to the prior art.

2 is a perspective view showing a cross section in an engine warm-up state of a catalytic converter according to the prior art;

Figure 3 is a partially separated perspective view showing a cross section of the catalytic converter according to the present invention.

Figure 4 is a cross-sectional view of the operating state of the cold start of the catalytic converter hydrocarbon adsorption unit according to the present invention.

5 is a cross-sectional view showing an operating state after engine warm-up of the catalytic converter hydrocarbon adsorption unit according to the present invention.

Explanation of symbols for the main parts of the drawings

100: hydrocarbon adsorption unit 110: cell

120: hole 210: blocking plate

220: heat transfer plate 230: driving rod

240: pinion gear 500: cover

600: driving means 610: actuator

620: Rack

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, the technical configuration and operation of which are as follows.

Figure 3 is a partial perspective view showing a cross section of the catalytic converter according to the present invention, Figure 4 is a cross-sectional view showing a state in which the hydrocarbon adsorption portion of the catalytic converter is operating during cold start, Figure 5 is operated after the engine warm-up of the catalytic converter hydrocarbon adsorption unit It is sectional drawing which showed state.

As shown in the drawings, the present invention includes a first catalyst portion and a second catalyst portion for purifying exhaust gas, and a hydrocarbon adsorption portion for adsorbing hydrocarbons passing through the cell during cold startup. It relates to a catalytic converter and is configured by rotatably installing the blocking plate 210 and the heat transfer plate 220 to open and close the hole (120).

The blocking plate 210 is installed at the rear of the hole 120 so as to block the hole 120 formed through the center of the cell 110 of the hydrocarbon adsorption unit 100 and is formed in a rotatable size and shape to rotate. While passing or blocking the exhaust gas.

In addition, the heat transfer plate 220 is formed to have the same shape and size as the blocking plate 210, and a plurality of through holes 221 are formed so that the exhaust gas passes through the heating wire heated when power is applied. Coupled with the blocking plate 210 is to be installed to rotate together with the blocking plate 210 in the hole (120).

The driving rod 230 is installed behind the hydrocarbon adsorption unit 100 so that the blocking plate 210 and the heat transfer plate 220 coupled to each other can rotate inside the hole 120 of the hydrocarbon adsorption unit 100. The blocking plate 210 and the heat transfer plate 220 are coupled to the coupling portion 211 intersecting.

In addition, the driving rod 230 is coupled to the coupling portion 211 by way of coupling through the coupling portion 211, and the driving rod is coupled to both ends of the coupling portion 211, respectively, In one of the methods, the driving rod 230 coupled with the coupling part 211 is fixed at both ends through the cell 110 behind the hydrocarbon adsorption part 100, and one end thereof protrudes out of the cover 500 of the catalytic converter. Rotational transmission means such as pinion gear (gear, 240) or the rotation lever is coupled to the protruding portion.

Meanwhile, the driving means 600 rotates the driving rod 230 by transmitting a motion to the driving rod 230 connected thereto through the rotation transmission means, and the driving means 600 rotates as shown in FIG. 3. In the case where the transmission means is the pinion gear 240, the rack 620 may be engaged with the pinion gear 240, and the actuator 610 may move the rack 620 forward and backward.

When the pinion gear 240 is used as the rotation transmission means as described above, when the cylinder rod of the actuator 610 is operated to advance the rack 620 engaged with the pinion gear 240, the pinion gear 240 rotates. Accordingly, the driving rod 230 is rotated.

On the other hand, it is also possible to use a rotation lever (not shown in the figure) as the rotation transmission means in this case, connecting the rotation lever to form a right angle with one end of the driving rod 230 protruding outside the cover 500 and the actuator on the other end of the rotation lever Combining the cylinder rod of 610, the end of the rotation lever rotates in an arc in accordance with the forward / backward of the cylinder rod, and accordingly the drive rod 230 is rotated.

Instead of the actuator 610, the driving means 600 may use a solenoid valve (not shown in the figure), and may also use a gear to reduce the rotation of the motor and the motor to be transmitted to the pinion gear 240.

In the drawings, reference numeral 500 denotes a cover in which the first catalyst part (not shown) and the second catalyst part (not shown) and the hydrocarbon adsorption part 100 are installed, and 121 is a driving rod. An insertion groove formed in the cell 110 so that the 230 is inserted, and 211 denotes a coupling portion where the blocking plate 210 and the heat transfer plate 220 cross each other.

The operation state according to the present invention configured as described above will be described with reference to the drawings.

That is, during cold start, as shown in FIG. 4, when the actuator 610 of the driving means 600 is moved to advance the rack 620, the rotation transmission means engaged with the rack 620, that is, the pinion gear ( 240 rotates and the driving rod 230 coupled thereto rotates together.

When the driving rod 230 rotates as described above, the blocking plate 210 coupled thereto rotates to block the hole 120 of the hydrocarbon adsorption unit 100, and accordingly exhaust gas introduced into the hole 120. Since it is blocked and does not pass through and flows back to the second catalyst part through the cell 110, the exhaust gas passes through the cell 110 while hydrocarbons are absorbed into the cell and then discharged.

5 is a cross-sectional view of the catalytic converter hydrocarbon adsorption unit in a state in which the engine is warmed up and the second catalyst is activated. As shown in the figure, the driving rod 230 is rotated after the engine is warmed up. The heat plate 220 is positioned to block the hole 120.

Then, the exhaust gas flows into the hole 120, passes through the heat transfer plate 220, and then flows toward the second catalyst unit. At this time, an external power source forms the heat transfer plate 220 through the driving rod 230 serving as an electrode. The heating wire is applied to the heating wire and the heating wire is heated, thereby increasing the temperature of the exhaust gas passing through the through hole between the heating wires.

As the temperature of the exhaust gas rises, a high temperature exhaust gas flows into the second catalyst part, and thus activation of the second catalyst part is promoted, thereby more effectively purifying hydrocarbons adsorbed and desorbed upon the hydrocarbon adsorption part 100 during cold start. You can do it.

As described above, the present invention controls the flow of the exhaust gas through opening and closing of the blocking plate by simply installing the blocking plate and the heat transfer plate at the rear end of the exhaust gas adsorption unit without an air converter having a pump as described above. It is a useful invention to effectively reduce the hydrocarbon exhaust gas generated during the initial cold start by promoting the activation of the second catalyst portion by using a heat transfer plate.

Claims (1)

In the catalytic converter having a hydrocarbon adsorption unit having a hole 120 in the center of the cell, A blocking plate 210 formed to be rotatable while blocking the hole 120 and installed in the hole 120; A heating plate 220 formed of a heating wire that is heated when power is applied, and a plurality of through holes 221 are alternately coupled with the blocking plate 210; It is coupled to the coupling plate 211 of the heat exchanger plate 220 and the blocking plate 210 coupled to each other and installed through the rear cell 110 of the hydrocarbon adsorption unit 100, one end is out of the catalytic converter cover 500 A driving rod 230 which protrudes and a rotation transmission means is coupled to the protruding portion; A driving means (600) connected to the rotation transfer means of the driving rod (230) to rotate the driving rod (230); Catalytic converter control device for exhaust gas purification of a vehicle, characterized in that consisting of.