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    A method for purifying exhaust gas of an internal combustion engine
    2.
    发明公开
    A method for purifying exhaust gas of an internal combustion engine 失效
    Verfahren zum Reinigen des Abgases eines Verbrennungsmotors

    公开(公告)号：EP1410837A3

    公开(公告)日：2004-04-28

    申请号：EP04001249.4

    申请日：1996-09-10

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Araki, Yasushi ,  Mizuno, Tatsuji ,  Tanaka, Toshiaki

    IPC分类号： B01D53/50 ,  B01D53/94 ,  F01N3/08 ,  F01N3/02 ,  F01N3/28 ,  F01N3/20

    CPC分类号： F02D41/3827 ,  B01D53/508 ,  B01D53/9481 ,  B01D53/9495 ,  B01D2257/302 ,  F01N3/035 ,  F01N3/0821 ,  F01N3/085 ,  F01N3/0871 ,  F01N3/2882 ,  F01N2250/02 ,  F01N2250/12 ,  F01N2570/04 ,  F01N2610/03 ,  F01N2900/1612 ,  F02D41/028 ,  F02D41/1446 ,  F02D2200/0404

    摘要： According to the present invention, SO X in the exhaust gas of an internal combustion engine is absorbed by a sulfate absorbent which absorbs SO X in the exhaust gas when the temperature is lower than a releasing temperature and releases the absorbed SO x when the temperature becomes higher than the releasing temperature. When the exhaust gas temperature increases during the operation of the engine and reaches the releasing temperature, the temperature of the exhaust gas flowing into the sulfate absorbent is further raised to a predetermined temperature by supplying fuel to the exhaust gas passage upstream of the sulfate absorbent. The ratio of SO 3 in the SO X mixture released from the sulfate absorbent changes in accordance with the temperature, and takes the highest value at a certain temperature (i.e., a peak temperature). Therefore, when the exhaust gas temperature is raised above the peak temperature, the ratio of SO 3 in the SO X mixture released from the sulfate absorbent decreases as the temperature increases. In the present invention, the above-noted predetermined temperature is selected in such a manner that the ratio of SO 3 at this predetermined temperature becomes lower than the ratio of SO 3 at the releasing temperature. Therefore, when SO X is released from the sulfate absorbent, the amount of SO 3 , i.e., the amount of particulate matter released into the atmosphere can be maintained at a low level.

    摘要翻译： 在内燃机的排气中减少三氧化硫的量包括在低于脱模温度的温度下将含有硫氧化物的废气与硫酸盐吸收剂接触，并且将吸收硫氧化物的吸收剂的温度升高至预定的 温度高于释放温度以从吸收剂中释放所吸收的硫氧化物。

    Exhaust gas purifying device for engine
    10.
    发明公开
    Exhaust gas purifying device for engine 失效
    Abgasreinigungseinrichtungfüreinen Motor

    公开(公告)号：EP0861973A1

    公开(公告)日：1998-09-02

    申请号：EP98102796.4

    申请日：1998-02-18

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Hirota, Shinya ,  Tanaka, Toshiaki ,  Mizuno, Tatsuji

    IPC分类号： F01N3/08 ,  F01N3/20 ,  F02D41/02 ,  F02D21/08 ,  F02B37/18

    CPC分类号： F02D41/402 ,  B01D53/8696 ,  B01D53/9418 ,  B01D53/9481 ,  B01D53/9486 ,  B01D53/9495 ,  B01D2251/208 ,  B01D2255/102 ,  B01D2255/202 ,  B01D2255/204 ,  B01D2258/012 ,  F01N3/0842 ,  F01N3/0871 ,  F01N2260/14 ,  F01N2570/12 ,  F01N2610/03 ,  F02B1/04 ,  F02B23/101 ,  F02B37/18 ,  F02B2075/125 ,  F02D9/04 ,  F02D41/005 ,  F02D41/027 ,  F02D41/0275 ,  F02M26/15 ,  Y02T10/123 ,  Y02T10/144 ,  Y02T10/24 ,  Y02T10/44 ,  Y02T10/47

    摘要： An exhaust gas purifying device for an engine (1) comprises an exhaust gas purifying catalyst (19) arranged in the exhaust passage. The catalyst is capable of reducing NO X in the catalyst in the oxidizing atmosphere, and comprises a reducing agent adsorbent adsorbing a reducing agent in the inflowing exhaust gas therein when the pressure in the adsorbent becomes higher, and desorbing the adsorbed reducing agent therefrom when the pressure in the adsorbent becomes lower. An exhaust gas control valve (23) is disposed in the exhaust passage downstream of the catalyst. When both the engine load and the engine speed are low, the opening of the valve is made smaller to increase the pressure in the catalyst. At this time, hydrocarbon is fed to the catalyst, and is then adsorbed in the catalyst. When the engine load or the engine speed becomes high, or the cumulative amount of hydrocarbon fed to the catalyst becomes larger than a predetermined amount, the valve is made fully open to reduce the pressure in the catalyst. At this time, the adsorbed hydrocarbon is desorbed from the catalyst, and then reduces NO X in the catalyst.

    摘要翻译： 用于发动机（1）的排气净化装置包括布置在排气通道中的废气净化催化剂（19）。 该催化剂能够在氧化气氛中还原催化剂中的NO x，并且当吸附剂中的压力变高时，还含有吸附还原剂的还原剂吸附在其中的废气中，并且当压力 在吸附剂中变得更低。 废气控制阀（23）设置在催化剂下游的排气通道中。 当发动机负荷和发动机转速都低时，阀的开度变小以增加催化剂中的压力。 此时，将烃加入到催化剂中，然后将其吸附在催化剂中。 当发动机负荷或发动机转速变高或供给到催化剂的烃的累积量变得大于预定量时，阀完全打开以降低催化剂中的压力。 此时，吸附的烃从催化剂中解吸，然后还原催化剂中的NO x。