KR19980021984A - Early activation system of exhaust gas catalytic converter - Google Patents

Abstract

In order to provide a control system that adds an electronic control system to the vehicle's exhaust gas catalytic converter and prematurely activates the catalyst, if necessary, to prevent harmful emissions from being released into the atmosphere at the beginning of engine start-up, the catalyst of the precious metal surface A catalytic converter comprising a carrier attached to the exhaust gas, an exhaust gas control valve mounted on the tip of the catalytic converter to control the flow of the exhaust gas, and a step moder for providing power to open and close the exhaust gas control valve. And a controller in which a time required for activating the catalyst for securing the temperature conditions necessary for the catalytic reaction is input in advance.

Description

Early activation system of exhaust catalytic converter

(Technology field)

The present invention relates to an early activation system of an exhaust gas catalytic converter, and more particularly, to an early catalyst activation system of an exhaust gas catalytic converter capable of quickly obtaining an activation temperature required for a catalytic reaction at the initial stage of starting a vehicle.

(Prior art)

In general, the exhaust gas catalytic converter of a vehicle is mounted on the exhaust system of a vehicle, and unburned components of carbon monoxide (CO) and hydrocarbon (HC) copper in the exhaust gas are carbon dioxide (CO ₂ ) and water vapor (H), which are harmless to the human body by an oxidation catalyst. ₂ O), each of which is oxidized and nitrogen oxide (NO _X ) is decomposed by oxygen (O ₂ ) sensor to reduce to nitrogen (N ₂ ) and oxygen (O ₂ ) and exhaust gas to purify to gas harmless to human body Reduction device.

3 is a schematic diagram illustrating a conventional general exhaust gas catalytic conversion system in which exhaust gas discharged from the exhaust manifold 10 side of the engine is purged through the catalytic converter 20 and then discharged to the outside air through the exhaust pipe. The configuration is shown as possible.

Exhaust gas catalytic converter 20 is a catalyst that generates a chemical reaction to purify the harmful components of the exhaust gas, there are platinum, rhodium copper noble metals and non-metals such as copper, manganese, but generally carbon monoxide (CO), hydrocarbons (HC The noble metals most suitable for chemical reactions with c) are attached to the surface of the carrier 21 for increasing the effective area of the catalyst.

In addition, in order to generate a chemical reaction required to purify the exhaust gas, heat in the catalytic converter 20 requires a certain temperature or more, which is called an activation temperature, in which the high temperature exhaust gas discharged from the engine flows into the catalytic converter 20. Obtained by.

Since the catalytic converter 20 generates a lot of heat when promoting a chemical reaction, the catalytic converter 20 may shorten the life of the catalyst. Thus, the catalytic converter 20 may be manufactured as a heat insulating material, thereby preventing the catalyst from aging under the influence of heat.

However, the above-described conventional exhaust gas catalytic converter has a long delay before the temperature in the catalytic converter becomes higher than the activation temperature necessary for causing a chemical reaction for the purification of the exhaust gas. If the amount is small and the temperature of the exhaust gas is not high enough, there is a problem that the exhaust gas introduced into the catalytic converter is discharged to the outside as it is without purification by chemical reaction.

Accordingly, the present invention provides a catalyst early activation system of an exhaust gas catalytic converter which can prevent the emission of harmful exhaust gas into the atmosphere at the beginning of the vehicle by adding an electronic control system to the catalytic converter and activating the catalyst early if necessary. Its purpose is to.

An object of the present invention described above is a catalytic converter comprising a carrier having a catalyst of a noble metal attached to a surface thereof, an exhaust gas control valve mounted at a tip of the inside of the catalytic converter to control the flow of the exhaust gas, and the exhaust gas. Preliminary catalyst activation system of the exhaust gas catalytic converter, characterized in that it comprises a step motor for providing power for opening and closing the control valve, and a control unit for inputting the catalyst activation time required to secure the temperature conditions required for the catalytic reaction in advance It can be implemented by.

1 is a block diagram of an early activation system of an exhaust gas catalytic converter according to the present invention

2 is a system block diagram of the present invention.

3 is a simplified configuration diagram of a conventional general exhaust gas catalytic converter

* Explanation of symbols for the main parts of the drawings

10: exhaust manifold 20: catalytic converter

21 carrier 30 exhaust gas control valve

40: step motor 50: control unit

Preferred embodiments of the present invention described above will be described in detail below with reference to the accompanying drawings.

1 is a system diagram showing the configuration of a catalyst early activation system according to the present invention, which includes a catalytic converter 20 for purifying exhaust gas discharged from an exhaust manifold 10 side of an engine, and a catalytic converter 20 of the catalytic converter 20. It consists of the exhaust gas control valve 30 installed in the inner front end, the step motor 40, and the control part 50 which controls a system.

The controller 50 memorizes the time required for the activation of the catalyst corresponding to the exhaust characteristics of the vehicle after the start of the engine start of the vehicle is stored in advance. Therefore, at the same time the driver starts the engine, the controller 50 performs the early activation control according to the present invention for a time measured and stored in advance.

The exhaust gas control valve 30 mounted at the inner end of the catalytic converter 20 is opened and closed electronically by a step motor 40 which is self-driving on the wall of the catalytic converter 20. The case where 30 is opened is a case where control for early activation of the catalyst according to the present invention is performed, and the exhaust gas introduced into the catalytic converter 20 by the opening of the exhaust gas control valve 30 is a catalyst. It was configured to pass through only one side of the transducer 20.

The exhaust gas passing through only a part of the catalytic converter 20 but not the whole means that the exhaust gas is concentrated only on a part of the carrier 21, thus reducing the effective carrier area to increase the density of the exhaust gas passing through the catalyst. Because of the effect, the activation temperature of the catalyst can be sufficiently secured even with a small amount of exhaust gas at the beginning of engine start.

The exhaust gas control valve 30 is connected to a step motor 40 separately installed outside the catalytic converter 20, and the opening and closing operation is performed according to whether the depth motor 40 is driven, and the step motor ( 40 is determined whether or not the driving of the electronic device by the control unit 50.

FIG. 2 is a block diagram of a catalyst early activation system having the configuration of FIG.

An early activation system consisting of an exhaust manifold 10, a catalytic converter 20, an exhaust gas control valve 30 and a step motor 40, and a control unit 50, and a passage through which exhaust gas passing through the catalyst is discharged to outside air Exhaust pipes are shown in blocks, respectively.

The control unit 50 checks and memorizes the time required to prepare the optimum catalyst activation temperature environment corresponding to the exhaust characteristics of the vehicle in advance. Therefore, the control unit 50 stores the step motor for the time stored in the memory after starting the engine. Start 40.

When the step motor 40 is operated, the exhaust gas control valve 30, which is connected to the step motor 40 and installed at the front end portion of the catalytic converter 20, that is, the introduction portion of the exhaust gas, is operated.

The exhaust gas control valve 30 is structured so that the valve is opened by the step motor 40, and in particular, the exhaust gas control valve 30 is manufactured in the form of a throttle valve, and the exhaust gas control valve 30 is generated by an opening angle of the valve generated in the on state of the exhaust gas control valve 30. The exhaust gas flowing into the inlet side of the catalytic converter 20 can be concentrated only as part of the catalytic converter 20.

Therefore, the area through which the exhaust gas passes through the carrier in the catalytic converter 20 is narrowed, and the catalyst material attached to the carrier and the exhaust gas locally meet to cause a intensive chemical reaction, thus catalyzing even a small amount of exhaust gas. It is a configuration that can quickly obtain the required activation temperature.

When the early activation operation of the catalyst is completed by the timing function of the controller 50, the controller 50 restarts the step motor 40 to turn off the exhaust gas control valve 30 that is currently open to exhaust the exhaust gas as usual. It is used in a manner that applies to the catalytic converter 20 and the entire area.

The early activation system of the exhaust gas catalytic converter according to the present invention rapidly converts the temperature in the exhaust gas catalytic converter to the activation temperature required for the chemical reaction when the amount or temperature of the exhaust gas is not sufficient for heat generation, such as at the start of a car. It is possible to reach the effect of preventing harmful components of exhaust gas from being released into the atmosphere without being purified at the start of the engine.

Claims (1)

In the early activation system of the exhaust gas catalytic converter, a catalytic converter comprising a carrier having a catalyst of a noble metal attached to a surface thereof, an exhaust gas control valve mounted on a tip of the inside of the catalytic converter to reduce inflow of exhaust gas and flow; The catalyst of the exhaust gas catalytic converter, characterized in that it comprises a step motor for providing power for opening and closing of the exhaust gas control valve, and a controller for inputting the catalyst activation time required for securing the temperature conditions necessary for the catalytic reaction in advance Early activation system.