Method for operating a combustion engine having a four-way catalyst
A technology of internal combustion engines and catalytic converters, applied in the direction of internal combustion piston engines, combustion engines, machines/engines, etc., can solve problems such as desulfurization of unfavorable storage catalytic converters
Inactive Publication Date: 2010-12-29
FORD GLOBAL TECH LLC
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If suitable, the temperature is further increased, but this is not conducive to the subsequent desulfurization of the storage catalytic converter
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[0080] According to the invention, the temperature T of the oxidation catalytic converter is included 催化剂 , and the temperature can be measured directly or calculated by a temperature sensor. In this case, the calculation of the temperature can be based, for example, on a temperature detected at another point in the exhaust pipe. Existing sensors, eg for on-board diagnostics (OBD), can be used in this way.
[0081] pre-defined T 阈值，1 Can vary and can depend on the respective goals. The minimum or threshold temperature T 阈值，1 It can be pre-defined, for example, from about 180°C to 250°C.
[0082] Said temperature of the oxidation catalytic converter, together with the exothermic reactions taking place in the oxidation catalytic converter during fuel enrichment of the exhaust gas, ensures that the downstream storage catalytic converter operates in its preferred temperature window of 200°C to 450°C. The release of the stored nitrogen oxides and their subsequent reduction takes...
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One method for operating compression ignition engine includes the following steps: if the present temperature of the oxidation catalysis converter T catalyst is less than the pre-defined temperature T threshold value, 1, namely the T catalyst is less than the T threshold value, 1, heating the oxidation catalyst converter of the combined air-exhausting after-treatment system to the pre-defined temperature T threshold value, 1; then concentrating the exhaust air to deoxidize the reducing agent of the nitrogen oxide (NOX). In the method: to begin the reactivation of the particulate filter, preliminarily defining the temperature T threshold value, 1, increasing the corrected value delta TDPF, namely the T threshold value, 2= T threshold value, 1+delta T, the temperature increment delta TDPF is preliminarily defined as the function of the filter load m carbon black, namely the delta TDPF= f( m carbon black), and / or to do desulphurization to the storage catalytic converter (LNT), preliminarily defining the T threshold value, 1 or T threshold value, 2, increasing the corrected value delta TLNT which gets to the T threshold value, 3, the temperature increment is preliminarily defined as the function of the total conversion of the nitrogen oxide delta NOX, namely the delta TLNT=f(delta NOX). The objective of the invention is to provide a method for operating the style of the combined air-exhausting after-treatment system with an advantageous mode, especially relates to the reactivation of the particulate filter and the cleaning or desulphurization of the storage catalytic converter.
Description
technical field [0001] The invention relates to a method for operating an internal combustion engine, in particular an internal combustion engine with a four-way catalytic converter. Background technique [0002] According to the prior art, internal combustion engines have different exhaust gas aftertreatment systems in order to reduce pollutant emissions. Even without additional measures, oxidation of unburned hydrocarbons (HC) and carbon monoxide (CO) occurs as the cylinder charge is expanded and expelled if the temperature level is high enough and a sufficient amount of oxygen is present. However, the reaction is rapidly interrupted as a result of the rapid drop in exhaust gas temperature downstream and the resulting rapidly reduced reaction rate. Any oxygen deficiency can be compensated by a secondary injection of air. However, it is often necessary to provide special reactors and / or filters in the exhaust pipe in order to significantly reduce pollutant emissions under...
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IPC IPC(8): F01N3/28F01N3/023
CPCY02T10/26B01D53/9409F01N3/035F01N3/0821B01D2258/012F02D41/028F01N3/2033F02D41/405F02D41/0055F02D41/024F01N3/103F02M25/0718F01N3/0814F01N13/02F02D41/029B01D53/9495F01N2430/085F01N2610/03F01N13/009F02M26/15Y02T10/12
Inventor 马修·艾伦·施奈德亚西尔·穆罕默德·赛义德·雅各布马里奥·贝尔诺维克简·哈姆森布兰登·帕特里克·卡伯里阿列克谢·A·杜布科夫
Owner FORD GLOBAL TECH LLC