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Exhaust filter regeneration regime method and apparatus

A technology of exhaust filter and regeneration device, which is applied in the direction of exhaust device, electric control of exhaust treatment device, diagnostic device of exhaust treatment device, etc., which can solve the problem of temperature dependence, temperature rise and undesired emission of regeneration working conditions things and other issues

Inactive Publication Date: 2007-03-21
PYROBAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the fuel injection rate is too high, it will skim the catalytic converter without reacting, producing undesirable emissions such as white smoke
[0009] Existing systems also create other problems: regeneration conditions are heavily dependent on temperature, i.e. the type and use of the car, e.g. the duty cycle of the car
However, problems can arise if excessive fuel is injected, with the end of the temperature rise as the front of the catalytic converter cools

Method used

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  • Exhaust filter regeneration regime method and apparatus
  • Exhaust filter regeneration regime method and apparatus
  • Exhaust filter regeneration regime method and apparatus

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Embodiment Construction

[0019] In general, please refer to FIG. 1, which is a block diagram of the main parts of an engine employing the system of the present invention. It can be seen that air is sent from the intake manifold 10 to the engine 12 from which exhaust gas is sent into the exhaust manifold 14 . The exhaust gas then passes through exhaust conduit 16a to catalytic reducer 18 for reduction of CO and HC. The reduced exhaust flow passes through exhaust conduit 16b to a diesel particulate filter (DPF) 20 where particulate matter such as soot is removed from the exhaust flow, and the exhaust flow passes through exhaust conduit 16c.

[0020] Fuel injectors 22 are mounted in exhaust conduit 16 a proximate exhaust manifold 14 . Alternatively fuel injectors 22 may be mounted directly in exhaust manifold 14 to benefit from the highest exhaust flow temperature. Fuel entering the exhaust stream metered by fuel injector 22 is oxidized by catalytic converter 18 to provide heat. This heat helps raise ...

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Abstract

An exhaust filter regeneration regime is described in which a filter (20) is regenerated by triggering an exothermic reaction in the filter (20) to burn off particulate load. In order to attain the appropriate regeneration temperatures fuel is injected in the exhaust stream and oxidises upon contact with a catalytic converter (18). A control regime comprises metering fuel injection dependent uponexhaust stream temperature to provide a flexible control regime independent of engine duty cycle.

Description

technical field [0001] The present invention relates to exhaust filter regeneration regimes, methods and apparatus, for example for the exhaust flow of a diesel engine. Background technique [0002] The above equipment is used to remove carbon monoxide, hydrocarbons and NOX pollutants and particulates produced in the exhaust system. [0003] In known systems, the most effective removal of fumes is usually achieved through filters. Regenerative traps such as Continuously Regenerated Traps (CRTs, Continuously Regenerated Traps) work by retaining soot particles in ceramic or silicone carbide filters, often referred to as Diesel Particulate Filters ( DPF, diesel particulate filter), which collects soot particles into the porous walls of the filter honeycomb structure. Accumulation of soot within the filter surfaces increases the back pressure on the filter, requiring regeneration of the filter. [0004] When the exhaust gas temperature reaches above about 600°C, the component...

Claims

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Application Information

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IPC IPC(8): F01N3/025F01N3/035F01N3/027F01N9/00F01N11/00
CPCY02T10/47Y02T10/40
Inventor I·H·拉特克里夫J·S·派克N·S·台斯特M·霍而特S·R·诺亚克斯
Owner PYROBAN