Series HC emission active adsorption and desorption device for cold start and control strategy

Abstract

The invention relates to a series HC emission active adsorption and desorption device for cold start and a control strategy. An air filter device, a gas inlet pipe and an engine are included. The air filter device is connected with the engine in series through the gas inlet pipe. A first three-way catalytic converter, an exhaust pipe, an adsorption device, an adsorption material and a second three-way catalytic converter are included. The first three-way catalytic converter, the adsorption device and the second three-way catalytic converter are connected with the engine in series through the exhaust pipe. The adsorption material is placed in the adsorption device. Each independent micropore in the surface of the adsorption material comprises two passageways connected with the external world. Opening and closing of the passageways are determined by the exhaust temperature. Active adsorption and desorption of HC emission of cold start of the engine are achieved, and emission at the cold start stage of the engine is effectively reduced. The device does not need extra pipelines and extra valves like those of a parallel type adsorption device. Space of automobile chassis is saved. The device solves the problem that because of high-temperature tail gas blowing, pollutant in a series cold start emission adsorption device of an old type is adsorbed in advance.

Description

technical field [0001] The invention provides a serial cold start HC emission active adsorption and desorption device and a control strategy, which belong to the field of internal combustion engines. Background technique [0002] Since the three-way catalytic converter cannot reach the working temperature during the cold start of the engine, HC emissions cannot be effectively converted during the cold start of the engine, and the control unit ECU needs to increase the amount of fuel injection to ensure the smooth start of the engine. form into the atmosphere. According to relevant test results, in the NEDC cycle test, 90% of HC emissions are produced in the cold start stage of the engine. Therefore, reducing the emission of pollutant gases during engine cold start has become one of the important issues to be solved urgently for the continued development of internal combustion engines. Adsorption technology is an effective means to solve HC emissions during engine cold star...

AI Technical Summary

Problems solved by technology

When the engine is in the cold start stage, the HC emissions in the exhaust gas are adsorbed in the adsorption device, and when the second three-way catalytic converter reaches the working temperature, the HC emissions adsorbed in the adsorption device are desorbed to the second three-way catalytic converter under the action of high-temperature exhaust gas. The reaction in the two-way three-way catalytic converter, however, because the desorption temperature of HC emission is usually lower than the operating temperature of the second three-way catalytic converter, which leads to a considerable part of the HC emission being advanced before the second three-way catalytic converter reaches the operating temperature desorption, thereby greatly reducing the adsorption effect

[0004] Therefore, it is necessary to design an adsorption system that can not only effectively reduce HC emissions during engine cold start, but also achieve desorption and regeneration of adsorption materials, avoid the problem of early desorption of adsorbed HC, simplify the structure of the adsorption system, and save the space of the car chassis. device is particularly necessary

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