Automobile tail gas three-way catalytic converter system and control method thereof

Abstract

The invention discloses an automobile tail gas three-way catalytic converter system. The automobile tail gas three-way catalytic converter system is provided with a carrier, a trapping body, an infrared heater, a sensor, a shell, a vibration attenuation layer, an air bypass pipe and a proportion bypass valve. The carrier has a honeycomb ceramic structure, and is arranged at the rear end of the shell; the trapping body is made of a tapping foaming metal material of which the surface is coated with an infrared coating material, and is arranged at the front end of the shell; the infrared heater is embedded at the expansion section of the air inlet of a catalytic converter; at the cold boot stage of an engine, an electronic control unit (ECU) controls the infrared heater to improve the temperature and the catalytic conversion rate of the tail gas; and when the temperature and differential pressure in the catalytic converter reach a certain range, the ECU controls the opening and closing of the infrared heater to promote unburnt products and complex on the trapping body to be gasified, and relieve the blockage condition of the catalytic converter. The system improves the conversion efficiency of the cold boot stage of the engine, traps and eliminates the unburnt products and the complex in the discharged gas and relieves the blockage condition of the catalytic converter, so that the service life of the system is prolonged.

Description

technical field [0001] The invention relates to an automobile tail gas three-effect catalytic converter system. Background technique [0002] At present, the carrier of the three-way catalytic converter for vehicles mostly adopts a honeycomb ceramic through-hole structure. The precious metal catalyst on the carrier has a strong adsorption effect on molecules such as incomplete combustion, sulfur, phosphorus, lead and manganese. After the vehicle reaches a certain mileage, The front end of the carrier channel is easy to form complex chemical complexes. At the same time, the strong oxidation and catalytic effect of noble metal catalysts makes it easier for the adsorbed incomplete combustion to oxidize, polycondense, and polymerize to form colloidal carbon deposits. [0003] If there are too many complexes and carbon deposits, they will be adsorbed on the surface of the three-way catalytic converter, so that the catalyst and the exhaust gas cannot fully contact, so that the NO...

AI Technical Summary

Problems solved by technology

When the temperature is too high, the Al in the coating 2 o 3 Even a phase change will occur, which intensifies the noble metal active component and additive CeO 2 The growth, sintering and aggregation of crystal grains greatly reduce the activity of the catalyst

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