DE4414049C2 - Intake catalytic converter for a motor vehicle - Google Patents

Description

The invention is based on a catalyst for Motor vehicle, the engine exhaust in heterogeneous cleans and regulates catalytic processes the capillary catalytic filter inserts sucks.

This procedure is given by filter inserts, which with the use of catalytic ingredients the substances resulting from engine combustion, such as: Carbon monoxides, nitrogen oxides, sulfur oxides, carbon Hydrogen, soot particles, in naturally occurring Convert fabrics and ge through a ventilation system give which these are converted into natural components converted exhaust gases, electronically controlled, extracted.

In the conventional catalytic process of exhaust gas tems is the residual oxygen content of the engine exhaust measured. The catalyst then processes in its optimized performance curve, the engine exhaust Engine carburetor adjustment, the more the gasoline mixture Added atmospheric oxygen to the critical area at full load is in the temperature range of 1000 ° C. The engine, however, works in its optimized Power delivery, which mixes in the engine carburetor preparation of a richer gasoline-air mixture points. In full load operation, this difference in the Adjustment of the engine carburetor and the catalytic converter lead to ineffective gasoline consumption because the Mon more gas / air mixture for the optimized mo power, if not with oxygen control probe the residual oxygen content of the exhaust gas is switched on is posed.  

In another conventional catalytic process The engine exhaust gases themselves are exposed to atmospheric oxygen through air openings in the exhaust pipe or catalytic converter blended to the catalyst in its efficiency to keep in the favorable residual oxygen exhaust gas ratio.

The development is that the catalyst through air nozzles ambient air in a cheap Exhaust gas residual oxygen ratio is supplied and the Engine exhaust from a front fan in the Kataly sator be swirled. In the swirl of the Abga The exhaust gas particles act catalytically seed surface in the filter insert in the movement more energy connected. The exhaust gas flows with egg adjustable flow rate through the ka pilar filter inserts in the catalytic converter. This does another fan that regulates the engine exhaust in the delivery rate.

A conventional catalytic converter reaches full operation of the engine, due to the back pressure in the exhaust system, high working temperatures in the catalytic converter. The cheap one Temperature range for catalytically active precious metal coating, such as, platinum, rhodium, palladium in the catalyst at 700 ° C.

With the swirling and regulated ventilation of the Engine exhaust can affect the working temperature cool and by dividing the catalyst into two units screwed together, the Use filter cartridges that are replaced can. Furthermore, the exhaust gas flow is through a network like grid system in the catalyst. With the Invention can the grating filter system in its cap laren passage size can be reduced and it can Catalytic filter materials are used, which in the React temperature earlier.  

In the swirling of the exhaust gas mixture in the first kata part of the analyzer will reduce the emission of Soot particles achieved in the exhaust gas.

The division of the catalyst system into two together Joined, screwed sub-units causes an off Interchangeability for catalyst filter elements.

Furthermore, by adding fresh air and the controlled suction of this enriched Exhaust gas stream optimization of the catalyst in vol Achieve load operation of the motor vehicle, because the kriti cal temperature range in the catalyst by the Erfin avoided.

Furthermore, other kata can be achieved by the invention lytically active substances for conventionally used Platinum / Paladium / Rhodium use those in temperature react effectively catalytically earlier, however are not as resilient in the temperature range as: Nickel oxide with a temperature range of 200 ° -600 ° C. The catalytically active nickel oxide has a good electron work function in catalytic re action and therefore has a good catalytic reagent for the sulfur monoxide, carbon monoxide of the exhaust gas. The electronic structure of the catalytically active Nickel oxide is affected by gold, a precious metal, in a thin layer under the Ni is evaporated on the carrier material and so with the electron work function of the nickel oxide gest is increased.  

The invention is based on an in the attached Zei illustrated embodiments explained. Show it:

Fig. 1: a perspective view of the cut left split catalyst half.

Fig. 2: a perspective view of the cut right split catalyst half.

Fig. 3: a side. Sectional view of the assembled catalyst.

Fig. 4: a sectional view of the catalyst.

Fig. 5. is a system circuit diagram of the elements that are required for the operation of the catalyst.

The catalytic converter 1 of a motor vehicle, not shown, has a connection 2 on each side, which makes it possible to connect it to the existing gas system.

Aluminum is the base material of the outer skin 3 and inner skin 4 , which has good material properties in the hardness of the metal and due to its low weight. Outer 3 and inner skin 4 of the catalytic converter are connected with clamping rings 5 , a ceramic layer 6 being baked between the sheathing layers for exhaust and heat insulation of the catalytic filter inserts. In the first of the divided catalyst 7 are two filter inserts 8 + 9 and a steel cage insert 10 made of heat-resistant sintered metal, which centers the Verwirbelventila gate 11 and a drive shaft 12 .

In the second part of the divided catalytic converter 13 there are a catalytic filter insert 14 , a steel-metal cage insert 10 , for mounting the drive shaft 12 , with a coupling joint 15 and heat-resistant metal-ceramic bearings 16 . Between the filter elements, two air nozzles, which are actuated with a sliding mechanism, are attached.

This bearing of the axial drive shaft 12 with the composite material silicon carbide with graphite coating on aluminum oxide has good thermal conductivity, high compressive strength softening temperature at 2500 ° C. Furthermore, in the second catalyst insert there is an axial fan 17 fastened on the axial shaft 12 , which sucks the catalytically cleaned exhaust gas through the catalyst. Both catalyst halves are composed of screw connections 18 .

The carburetor introduces a favorable for the engine work Air and gasoline mixture to the engine. That for catalysis required exhaust gas mixture is in the catalyst itself with air nozzles and the fans with a controller pro grams set.

The speed control of the axial fans is carried out by an electronic control unit, which the speed ei nes electric motor, in relation to the motor speed, than Auxiliary engine determined.

Claims (2)

1. Catalyst system for a motor vehicle with which Main structure of a separable catalyst with both side connections, for attachment to the Ab gas system. The first part of the divided Ka talysators two catalytic filter inserts, egg NEN metal grid to hold the axial drive shaft and the mounting one attached to the shaft fan with the metal ceramic bearings points. 2. Catalyst system according to claim 1, characterized records that the second part of the divided kata with a catalytic filter insert cheaper catalytic coating in terms of thermal value tung, such as nickel oxide and gold, and a steel cage to hold a fan with metal has ceramic storage. Both parts halves screwed together into a total kata represent lysator and the catalytic filter inserts are interchangeable, and the fans driven by a stationary drive motor become.