Exhaust gas purification method and exhaust gas purification system

An exhaust gas purification system and technology for exhaust gas purification, which are applied in exhaust treatment, electrical control, exhaust devices, etc., can solve the problems of worsening ride comfort and increasing fuel consumption, reducing exhaust gas volume, inhibiting fuel consumption increase, and effectively regenerating treatment. Effect

Inactive Publication Date: 2008-05-07
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, there are unburned hydrocarbons (HC), carbon monoxide (CO), NO X Wait for outflow to NO X Slippage on the downstream side of the purification catalyst, deterioration of ride comfort (running performance), increased fuel consumption and other disadvantages

Method used

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  • Exhaust gas purification method and exhaust gas purification system
  • Exhaust gas purification method and exhaust gas purification system
  • Exhaust gas purification method and exhaust gas purification system

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Embodiment Construction

[0045] Hereinafter, an exhaust gas purification method and an exhaust gas purification system according to embodiments of the present invention will be described with reference to the drawings.

[0046] In addition, although NO X storage reduction catalyst as NO X The example of purification catalyst will be described, but the present invention can also be applied to NO X direct reduction catalysts, etc. And, although the recovery of NO in the state of rich air-fuel ratio X The purification ability is mainly used to explain the recovery of NO X NO storage reduction catalyst X occlusion capacity, but the present invention can also use NO X Recovery of occlusion-reduction catalysts from sulfur poisoning, or NO X NO of direct reduction catalyst X Restoration of reducing power or recovery from sulfur poisoning, etc.

[0047] Moreover, the exhaust gas thick state mentioned here does not necessarily have to be rich in combustion in the cylinder, but refers to the exhaust gas...

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Abstract

An exhaust gas purification system has a NOx purification catalyst (22), and the catalyst (22) purifies NOx when the air-fuel ratio of exhaust gas of an internal combustion engine (E) mounted on a vehicle is in a lean state and recovers purification ability when the air-fuel ratio is in a rich state. The system performs recovery control for setting the exhaust gas to a rich air-fuel ratio state in order to recover the NOx purification ability of the NOx purification catalyst (22), and at the time of retardation of the vehicle, both fuel system rich control and air-intake system rich control are used in the recovery control. The recovery control can be performed without worsening of drive comfort of the vehicle and with deterioration of fuel consumption involved in the recovery control suppressed.

Description

technical field [0001] The invention relates to a device capable of reducing and purifying NO in the exhaust gas of an internal combustion engine X (nitrogen oxides) NO X An exhaust gas purification method and an exhaust gas purification system for purifying a catalyst. Background technique [0002] For the reduction and removal of NO from the exhaust gas of internal combustion engines such as diesel engines or some gasoline engines or various combustion devices X NO X As a catalyst, various studies or proposals have been made. Among them, as a NO reduction for diesel engines X Catalyst with NO X storage reduction catalyst and NO X direct reduction catalysts, etc. The use of these catalysts can effectively purify NO in exhaust gas X . [0003] The NO X The storage reduction catalyst is based on alumina (Al 2 o 3 ), zeolite and other oxide carrier layers are placed on catalyst noble metals that promote oxidation / reduction reactions and have NO X NO of storage fun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/12F02D45/00F01N3/08F01N3/20F01N3/24F01N3/28F02D9/02F02D9/04
CPCF01N3/0842F02D41/12F01N3/0885F01N3/0253F01N3/2033F01N2240/36F01N3/0814F02D41/0275F01N3/106F02D41/0002F01N3/0821F01N2013/026Y02T10/47F02D41/402F01N11/002Y02T10/26F01N3/108F01N13/0097Y02T10/12Y02T10/40Y02A50/20
Inventor 长冈大治我部正志
Owner ISUZU MOTORS LTD
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