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Exhaust gas purifier for diesel engine

An exhaust purification device, diesel engine technology, applied in exhaust devices, exhaust treatment, mufflers and other directions, can solve problems such as DPF blockage and burning, and achieve the effect of rapid oxidation

Inactive Publication Date: 2008-10-08
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the capacity of the DPF is small, not only may the DPF be clogged when a large amount of PM is generated, but it may also cause burnout when the accumulated PM burns temporarily

Method used

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  • Exhaust gas purifier for diesel engine
  • Exhaust gas purifier for diesel engine
  • Exhaust gas purifier for diesel engine

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Embodiment Construction

[0029] Next, an exhaust purification device for a diesel engine embodying the present invention will be described with reference to the drawings.

[0030] First, in FIG. 1 showing an overall schematic view of a diesel engine 1 according to the present invention, an intake manifold 3 constituting a part of an intake passage 5 and components are arranged in an engine main body 2 composed of a cylinder block and a cylinder head. Exhaust passage 7 is part of the exhaust manifold 4 . An air filter 6 for purifying intake air is provided at the most upstream portion of the intake passage 5 , and the intake air purified by the air filter 6 is supplied to the cylinder through the intake manifold 3 via the intake passage 5 . An exhaust passage 7 is connected to the exhaust manifold 4 , and the exhaust gas generated in the cylinder is discharged through the exhaust manifold 4 and the exhaust passage 7 .

[0031] The illustrated diesel engine includes a turbocharger 8 that supercharges i...

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PUM

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Abstract

This invention provides an exhaust gas purifier for a diesel engine provided with a continuous regeneration-type DPF using a catalyst. A by-pass passage is provided in an exhaust passage (7) in a diesel engine provided with a continuous regeneration-type DPF (12), and a small-capacity second continuous regeneration-type DPF (13) is installed. In a low-exhaust gas temperature region, PM is collected by the second continuous regeneration-type DPF (13). In this case, premixing combustion in which fuel injection timing for injecting a fuel into a cylinder is hastened is carried out to reduce the amount of PM produced. Accordingly, satisfactory collection can be carried out even when the capacity of the second continuous regeneration-type DPF (13) is small. Further, since the production of NOx is suppressed, a cooled exhaust gas is recirculated into a cylinder. Further, a urea-added SCR catalyst is installed in the exhaust passage (7) for reductive decomposition of NOx contained in the exhaust gas to further reduce NOx.

Description

technical field [0001] The present invention relates to the removal of particulate matter (PM) and nitrogen oxides (NO X ) exhaust purification device. Background technique [0002] Restrictions on exhaust gas from vehicle engines, especially diesel engines, have been tightened in recent years and are expected to become more stringent in the future. A diesel engine is an engine that injects fuel after compressing the air supplied to the cylinder to burn the fuel. Compared with a gasoline engine, it generally has high thermal efficiency and carbon dioxide (CO2) 2 ) emission is relatively small, but it is strongly required to reduce particulate matter composed of unburned components and other particulate matter: PM and nitrogen oxides: NO X emissions. [0003] As a device for removing PM from exhaust gas of a diesel engine, a diesel particulate filter (hereinafter referred to as "DPF") that traps PM with a filter is known and put into practical use. Since the trapped PM is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/24B01D53/94F01N3/02F01N3/08F02D21/08F02D41/02F02D41/04F02D41/38F02D45/00F02M25/07B01D46/42F01N3/023F01N3/031
CPCF02M25/0752F01N2340/04F01N13/02F01N2013/026Y02T10/144B01D53/944F02D2250/36B01D2258/012F02B3/06F02D13/0246Y02T10/18F01N3/035F01N3/2066F02M25/0774F01N2610/02F02M25/0727F01N2240/36F01N3/106F01N2610/08F02D41/029F02D13/0273F02D41/3035Y02T10/24B01D53/9409F02B37/00F02D9/04F02M25/0707F01N3/031Y02T10/128F01N13/0097F01N13/009F02M26/55F02M26/05F02M26/23F02M26/01Y02T10/12
Inventor 南利贵
Owner ISUZU MOTORS LTD
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