Heating device of three-way catalytic converter

Abstract

The invention discloses a heating device of a three-way catalytic converter. The heating device comprises an electric heating conversion unit used for heating engine tail gas flowing to the three-way catalytic converter in a convection mode. According to the heating device of the three-way catalytic converter, the engine tail gas flowing to the three-way catalytic converter in the convection mode is heated in advance, the temperature of waste gas at an inlet of the three-way catalytic converter can be increased, and therefore the conversion efficiency of the three-way catalytic converter can be effectively improved, and the automobile tail gas can be well purified.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust emission, in particular, the invention relates to a heating device for a three-way catalytic converter. Background technique [0002] With the increasing number of automobiles in China and even in the world, the impact of automobile exhaust pollutants on the environment is becoming more and more serious. Continuously tightening, this brings new challenges to the control means of automobile exhaust emission pollutants, and the current method of controlling automobile exhaust emission pollutants is mainly carried out through three aspects. The first is to improve engine combustion, It is called internal purification, such as improving the atomization of fuel by means of fuel injection pressure, injector aperture, and number of holes, and promoting the mixing of fuel and air by improving the fuel injection angle and the structure of the combustion chamber to reduce quenching. These soluti...

AI Technical Summary

Problems solved by technology

[0003] In addition, since the light-off temperature of the current three-way catalytic converter (exhaust temperature when the pollutant conversion efficiency reaches 50%) is generally around 300°C, and with the continuous increase of vehicle mileage, for example, in the currently released Chinese light-duty vehicles The fifth stage of the emission standard requires the endurance mileage of the vehicle to reach 160,000 kilometers, and the endurance mileage requirement of a higher standard will be longer. At this time, the light-off temperature of the three-way catalytic converter will increase with the mileage of the vehicle. At present, due to the continuous tightening of regulations, it is necessary to greatly improve the performance of the three-way catalytic converter for the treatment of automobile exhaust. In addition to the continuous increase in the content of precious metals, the volume of the three-way catalytic converter is also increasing. However, due to the limited layout space of the front compartment of the car, it cannot meet the increasing volume requirements of the three-way catalytic converter. Therefore, many layout methods now use two-stage three-way catalytic converters, that is, in A front-stage three-way catalytic converter is arranged in the front compartment of the engine, and a rear-stage three-way catalytic converter is arranged under the chassis of the car; since the rear-stage three-way catalytic converter is far away from the exhaust outlet of the engine, its inlet temperature is generally only It can be maintained at about 300°C, and the maximum conversion efficiency of the three-way catalytic converter cannot be exerted. Under such exhaust gas temperature conditions, on the one hand, it is necessary to increase the conversion efficiency by adding precious metals and other solutions, thus increasing the cost of the three-way catalytic converter On the other hand, a large amount of cost needs to be invested in the improvement of the original emission of the engine in order to make up for the problem of high emission caused by the low conversion efficiency of the three-way catalytic converter

Images