A METHOD FOR REDUCING DEPOSITS RELATED TO A REDUCTION AGENT IN A PORTION OF AN EXHAUST AFTERTREATMENT SYSTEM

• Main Authors: WILHELMSSON, Martin, KORSGREN, John
• Format: Patent
• Language: English; French; German
• Published: 02.11.2022
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

The invention relates to a method (400) for reducing deposits related to a reduction agent (204) in a portion (212) of an exhaust aftertreatment system (200) of an internal combustion engine (102), said exhaust aftertreatment system (200) comprising an injector (202) for injecting the reduction agent (204) into said exhaust aftertreatment system (200), and said portion (212) of said exhaust aftertreatment system (200) being located downstream of said injector (202), as seen in an intended direction of flow (208) of exhaust gas in said exhaust aftertreatment system (200), said method comprising the steps of:a) identifying a future operating sequence (300) for said internal combustion engine (102), said future operating sequence (300) comprising a first temporal portion (t1) and a second temporal portion (t2), said second temporal portion (t2) being subsequent to said first temporal portion (t1),b) performing a confirmation procedure comprising:∘ confirming that said future operating sequence (300) is suitable for reducing said deposits and∘ confirming that said internal combustion engine (102) operates in accordance with said precedingly identified future operating sequence (300),c) in response to said confirmation procedure being affirmative, executing a deposit removal dosage procedure comprising controlling said injector (202) such that a first dosage (d1) of reduction agent (204) is injected into said exhaust aftertreatment system (200) during at least a part of said first temporal portion (t1) and that a second dosage (d2) of reduction agent (204) is injected into said exhaust aftertreatment system (200) during at least a part of said second temporal portion (t2) said second dosage (d2) being smaller than said first dosage (d1).