Monitoring the light-off temperature of catalyst

A technology of oxidation catalyst and light-off temperature, which is applied to the electronic control of mufflers, exhaust devices, and exhaust treatment devices, etc., and can solve the problems of not fully considering the change of light-off temperature of diesel engine oxidation catalysts, etc.

Inactive Publication Date: 2011-03-30
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Disadvantage is that the variations in light-off temperature during the aging process of the diesel oxidation catalyst are not sufficiently taken into account in motor vehicles

Method used

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  • Monitoring the light-off temperature of catalyst
  • Monitoring the light-off temperature of catalyst
  • Monitoring the light-off temperature of catalyst

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Embodiment Construction

[0050] refer to figure 1 , step 104 shows determining the catalyst light-off temperature based on one light-off measurement. The calculation of the catalyst light-off temperature from the exhaust gas temperature data is based on a temperature model of the diesel oxidation catalyst 100, including the surface temperature of the diesel oxidation catalyst. In a step denoted light-off calculation 108, the determined catalyst light-off temperature is further compared with an estimated light-off temperature 106 calculated in the engine control unit. The light-off estimate 106 is based on an estimate of the aging of the diesel oxidation catalyst 102 . In step 110 the determined light-off temperature is stored in the engine control unit.

[0051] refer to figure 2 Exemplary steps performed in analyzing light-off measurements are detailed. In step 200 is shown the efficiency (Eff) used to calculate the diesel oxidation catalyst DOC ), where m EG represents the mass of exhaust gas...

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Abstract

Monitoring the light-off temperature of a diesel oxidation catalyst of a combustion engine, comprising the steps of measuring the temperature of the exhaust gas upstream and downstream of the catalyst during an injection phase of the engine, determining whether a catalyst light-off occurred by using the measured temperatures, calculating the surface temperature 108 of the catalyst by using the measured temperatures, and defining the calculated temperature as light-off temperature in the case that a catalyst light-off is confirmed. By means of this method it is possible to determine the actual light-off temperature of the catalyst der instance after each engine start by means of calculating the surface temperature of the catalyst. Since the light-off temperature is not considered as a constant but as a changing variable, the aging of the catalyst is sufficiently considered. Thus, it is provided a means for monitoring the light-off temperature of a diesel oxidation catalyst considering an aging of the catalyst.

Description

technical field [0001] The invention relates to a method and a device for monitoring the light-off temperature of an oxidation catalyst of a diesel engine. Background technique [0002] Diesel oxidation catalysts (DOCs) placed in the exhaust path of diesel engines are known to treat diesel engine exhaust before it is released into the atmosphere to convert harmful pollutants such as hydrocarbons and carbon monoxide through a catalytic oxidation process for carbon dioxide and water. [0003] Catalysis generally increases with increasing temperature. For the diesel engine oxidation catalyst must reach a threshold temperature before the catalyst can "ignite" and convert harmful gases through oxidation. The "light-off temperature" is defined as the temperature at which 50 mol % of the existing hydrocarbons are catalytically converted. It is important for diesel oxidation catalysts to reach the necessary operating temperature for normal operation as quickly as possible after a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20
CPCF02D41/405F02D41/0255Y02T10/26F01N2550/02F02D41/025F02D41/1446F02D2200/0804Y02T10/47F02D41/0005F02D41/062F01N11/002Y02T10/12Y02T10/40
Inventor 亚历山大·勒托斯滕·米勒马库斯·韦斯劳
Owner GM GLOBAL TECH OPERATIONS LLC
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