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    • 3. 发明授权
    • Method and arrangement for control of air-fuel ratio of combustion engine
    • 用于控制内燃机空燃比的方法和装置
    • US06467258B1
    • 2002-10-22
    • US09666686
    • 2000-09-20
    • Edward JobsonLars SandbergStaffan Lundgren
    • Edward JobsonLars SandbergStaffan Lundgren
    • F01N300
    • F01N3/0842B01D53/9495F01N13/009F01N13/0097F01N2250/12F02D41/0275F02D41/10F02D2250/41
    • A method and arrangement for control of a combustion engine (11) having control elements (4, 5, 17) for generation of an air/fuel mixture to each cylinder (3) of the engine (1), an exhaust system (7, 8) which is connected to the engine (1), an exhaust catalyst (10) and a NOx absorbent (11) which are provided in the exhaust system (7, 8), which method comprises: control of the control elements (4, 5, 17) in a first operating condition for generation of a comparatively lean exhaust gas mixture to the NOx adsorbent (11) for adsorption of NOx compounds in the exhaust gas mixture, and control of the control elements (4, 5, 17) in a second operating condition for generation of a comparatively rich exhaust gas mixture to the NOx absorbent (11) for desorption of NOx compounds in the exhaust gas mixture. The invention is characterized in that it comprises: detection of whether at least one condition in the vehicle prevails which corresponds to an initiation of a change-over from the first operating condition to the second operating condition, wherein all adjustment of the air/fuel mixture to the engine (1) is carried out, wherein the generation of a rich exhaust gas mixture is initiated for desorption of NOx compounds in the NOx adsorbent (11) depending on the conditions.
    • 一种用于控制内燃机(11)的方法和装置,其具有用于产生到发动机(1)的每个气缸(3)的空气/燃料混合物的控制元件(4,51,17),排气系统(7, 8),其连接到发动机(1),设置在排气系统(7,8)中的排气催化剂(10)和NOx吸收剂(11),该方法包括:控制元件(4, 5,17),用于产生用于吸附废气混合物中的NOx化合物的NOx吸附剂(11)的比较稀的废气混合物的第一操作条件,以及控制元件(4,51) 用于产生用于将废气混合物中的NOx化合物解吸的NOx吸收剂(11)的比较浓的废气混合物的第二操作条件。 本发明的特征在于:它包括:检测车辆中是否存在与从第一操作条件到第二操作条件的转换开始相对应的车辆中的至少一个状态,其中空气/燃料混合物的所有调整 发动机(1),其中根据条件开始产生富排气混合物以用于NOx吸附剂(11)中的NOx化合物的解吸。
    • 5. 发明申请
    • CATALYST UNIT FOR REDUCTION OF NOx COMPOUNDS
    • 用于还原NOx化合物的催化单元
    • US20080256934A1
    • 2008-10-23
    • US10908857
    • 2005-05-27
    • Kari ERANENEdward JobsonLennart CiderLars-Eric Lindfors
    • Kari ERANENEdward JobsonLennart CiderLars-Eric Lindfors
    • F01N3/20F01N3/28B01D53/56
    • B01J37/0244B01D53/9431B01J23/50B01J37/0215
    • A catalyst unit (1; 1′) configured for the reduction of NOx compounds in a gas stream and which includes a catalytically active material of the silver/alumina type. The catalyst unit (1; 1′) has at least one first reaction zone (3a, 3b, 3c, 3d, 3e) containing the catalytically active material and at least one second reaction zone (4a, 4b, 4c, 4d, 4e; 8a, 8b, 8c, 8d, 8e) which is arranged to permit breakdown of a gas species which is formed in the first reaction zone (3a, 3b, 3c, 3d, 3e), with N2 being formed, and in that the gas stream is conducted through the first reaction zone (3a, 3b, 3c, 3d, 3e) and the second reaction zone (4a, 4b, 4c, 4d, 4e; 8a, 8b, 8c, 8d, 8e). The invention results in an improved catalyst unit which in particular provides high-grade reduction of NOx compounds in an exhaust gas stream from a combustion engine.
    • 一种催化剂单元(1; 1'),其被配置用于在气流中还原NO x X 3化合物,并且其包括银/氧化铝型催化活性材料。 催化剂单元(1; 1')具有至少一个含有催化活性材料和至少一个第二反应区(4a,4b)的第一反应区(3a,3b,3c,3c, ,4c,4d,4e; 8a,8b,8c,8d,8e),其被布置成允许在第一反应区(3a,3b, 3 c,3 d,3 e),形成N 2,并且气流通过第一反应区(3a,3b,3c,3c, e)和第二反应区(4a,4b,4c,4d,4e; 8a,8b,8c,8d,8e)。 本发明导致改进的催化剂单元,其特别地提供了来自内燃发动机的排气流中高级还原NO x化合物。