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Desulfurizing method and device for precatalyst

A technology of pre-catalyst and catalyst, applied in the direction of exhaust device, muffler device, electrical control, etc.

Inactive Publication Date: 2006-08-23
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the reductants HC and CO will go through to some extent with the rich mode of operation and H 2 S emissions

Method used

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  • Desulfurizing method and device for precatalyst
  • Desulfurizing method and device for precatalyst
  • Desulfurizing method and device for precatalyst

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Embodiment Construction

[0047] right figure 1 The internal combustion engine 10 shown is associated with an exhaust system designated 12 . It is particularly advantageous if the internal combustion engine 10 is equipped with a direct injection part (not shown in the figures), with which the fuel delivered to the cylinder is injected directly into the combustion chamber of the cylinder via the high-pressure fuel injection valve. In addition, the internal combustion engine 10 can preferably be refueled in a laminar manner, wherein in laminar operation, the injected fuel is concentrated in a laminar manner in the region of the spark plug of the cylinder at the instant of ignition. In laminar operation, in particular, a lean air-fuel ratio is created, so that particularly low fuel consumption can be achieved. Exhaust equipment 12 includes an exhaust passage 14, wherein a small-volume pre-catalyst 16, such as a three-way catalyst, is provided at a position close to the engine, and a large-volume main cat...

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Abstract

The present invention relates to a desulfurizing method and a device for precatalyst (16) in the automotive exhaust system (14) of an internal-combustion engine (10), wherein at least another catalyst (18) in the postposition, especially a NOx storage catalyst. When reaching the temperature of the precatalyst (16) or in the process before reaching the temperature of the precatalyst (16), the said temperature of the precatalyst (16) higher than or equal to the lowest temperature-sulfur desorption temperature of the precatalyst (16), (a) during a first phase (tau 1), the engine (10) is operated under the first rich lambda conditions (lambda F1) until the oxygen storage of the postpositional catalyst (18) is essentially oxygen-free to a large extent, and (b) in a consecutive second stage (tau 2) operating the engine (10) in an alternating rich and lean sequence (lambda F2), (lambda M) for intervals (tau F), (tau M).

Description

technical field [0001] The invention relates to a method for desulfurizing a precatalyst arranged in the exhaust gas duct of an internal combustion engine, wherein at least one further catalyst, in particular a NOx storage catalyst, is arranged downstream of the precatalyst, and a method for the arrangement A device for desulfurizing a precatalyst in the exhaust gas tract of an internal combustion engine which can be operated leanly, wherein at least one further catalyst, in particular a NOx storage catalyst, is downstream of the precatalyst. Background technique [0002] Known catalyst systems for exhaust gas purification generally comprise at least one small-volume precatalyst arranged in the vicinity of the engine and at least one larger main catalyst arranged further downstream in the exhaust gas channel. Wherein the composition of the catalyst may be an oxidation catalyst for converting unburned hydrocarbons HC and carbon monoxide CO, a reduction catalyst for reducing n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F02D43/00
CPCY02T10/47
Inventor 埃卡特・波特马蒂亚斯・霍尔茨
Owner VOLKSWAGEN AG