公开(公告)号：EP1828556A1

公开(公告)日：2007-09-05

申请号：EP04809075.7

申请日：2004-12-14

申请人： VOLVO LASTVAGNAR AB

发明人： HINZ, Andreas ,  ANDERSSON, Lennart

IPC分类号： F01N3/20 ,  F01N11/00

CPC分类号： F01N3/0231 ,  F01N2250/02

摘要： The invention proposes a method, a device and a computer program product for the diagnosis of an oxidation catalyst (5, 25), for the oxidation of NO into NO2, in a motor vehicle. An exhaust gas aftertreatment system (2, 22) comprises at least the aforementioned oxidation catalyst and a particulate filter (6, 26) and/or an NOx- reducing catalyst (4, 26) arranged downstream of the oxidation catalyst, and a predetermined quantity of a reducing agent is supplied to the exhaust system upstream of the oxidation catalyst, and the NOx content or NO2 content is measured downstream of the oxidation catalyst. The method includes the following stages: - a first value (m11, S2, M31, s31) for the NOx/NO2 content is measured at a point in time before the reduction agent is supplied to the exhaust gas system (2, 22); - a second value (m12, S4, m32, s33) for the NOx/NO2 content is measured at a point in time during the period when the reduction agent is supplied to the exhaust gas system; - a comparison (S6, S35) is made between the aforementioned values, in conjunction with which an indication of the impaired function of the oxidation catalyst is obtained when the difference between the aforementioned measured values is less than a predetermined first value (k11, k31).

公开(公告)号：EP1802856A1

公开(公告)日：2007-07-04

申请号：EP05793304.6

申请日：2005-10-12

申请人： VOLVO LASTVAGNAR AB

发明人： HINZ, Andreas ,  ANDERSSON, Lennart

IPC分类号： F01N3/20

CPC分类号： F01N3/206 ,  B01D53/9431 ,  B01D2251/208 ,  F01N3/035 ,  F01N3/0835 ,  F01N3/106 ,  F01N13/009 ,  F01N13/0097 ,  F01N2570/14 ,  F01N2610/03 ,  F02D41/025 ,  F02D41/405 ,  Y02A50/2322 ,  Y02T10/26 ,  Y02T10/44

摘要： A method and an arrangement are provided for maintaining the oxidation of NO to NO2 in an oxidation catalytic converter arranged in a vehicle, the vehicle including an internal combustion engine which in operation emits exhaust gases to an exhaust gas after treatment system including the oxidation catalytic converter. A predetermined quantity of hydrocarbon is delivered to the exhaust gas aftertreatment system or the engine over at least one predetermined time interval for the purpose of maintaining the working temperature or regenerating an exhaust gas aftertreatment unit. The quantity of hydrocarbon is delivered to the exhaust gas aftertreatment system or to the engine through an injection with at least one predetermined fragmentation frequency and an injection period in order to maintain an NO2 production in the exhaust gas aftertreatment system that prevailed immediately prior to said time interval for the hydrocarbon injection.

公开(公告)号：EP1664497A1

公开(公告)日：2006-06-07

申请号：EP04775411.4

申请日：2004-09-09

申请人： VOLVO LASTVAGNAR AB

发明人： HINZ, Andreas ,  SALOMONSSON, Per ,  ANDERSSON, Lennart ,  PERSSON, Per

IPC分类号： F01N3/18

CPC分类号： F01N3/2066 ,  F01N3/021 ,  F01N3/0814 ,  F01N3/0821 ,  F01N3/0878 ,  F01N3/2053 ,  F01N13/009 ,  F01N2410/00 ,  F01N2610/03 ,  F02B1/12 ,  F02B29/0406 ,  F02M26/05 ,  F02M26/23 ,  Y02A50/2325 ,  Y02T10/24

摘要： The invention relates to a piston-type internal combustion engine (10) having an intake line (20) for delivering air to combustion chambers of the engine and an exhaust system (15, 22) for removing exhaust gases from said combustion chambers. The exhaust system comprises equipment (29, 30) for reducing environmentally harmful exhaust emissions from the engine, which is intended to function with variable load in order to propel a vehicle. The exhaust system (15, 22) comprises a branch pipe (26) controlled by a valve (24) and bypassing at least one part of the equipment (29, 30) for reducing environmentally harmful exhaust emissions. The valve (24) is controlled so that it leads the exhaust gas flow through the branch pipe (26) over a part of the overall load range of the engine. The engine is optimized in order to give acceptable exhaust emissions over said part of the overall load range of the engine.