公开(公告)号：US5839275A

公开(公告)日：1998-11-24

申请号：US911811

申请日：1997-08-15

申请人： Shinya Hirota ,  Kazuya Kibe ,  Tatsuji Mizuno ,  Satoshi Iguchi ,  Toshiaki Tanaka

发明人： Shinya Hirota ,  Kazuya Kibe ,  Tatsuji Mizuno ,  Satoshi Iguchi ,  Toshiaki Tanaka

IPC分类号： F02B3/06 ,  F02D41/02 ,  F02D41/14 ,  F02D41/40 ,  F01N3/20 ,  F02D41/34

CPC分类号： F02D41/024 ,  F02D41/1446 ,  F02D41/402 ,  F02D41/405 ,  F01N2430/00 ,  F02B3/06 ,  F02D2041/389 ,  F02D2250/32 ,  Y02T10/26 ,  Y02T10/44

摘要： A fuel injection control device for a direct injection type engine having an exhaust passage and a NO.sub.x catalyst arranged therein to purify NO.sub.x in exhaust gas discharged from the engine comprises fuel injectors for injecting fuel into a cylinder. The injecting operation of the fuel injectors is controlled to carry out a main fuel injection at the latest at the beginning of a power stroke of the engine. The injecting operation of the fuel injectors is controlled to carry out a sub fuel injection at one of a power stroke and an exhaust stroke of the engine after the main fuel injection is completed to increase an amount of hydrocarbon in the exhaust gas. The injecting operation of the fuel injectors is controlled to carry out an additional sub fuel injection after the main fuel injection is completed and before the sub fuel injection is carried out.

摘要翻译： 一种用于直接喷射型发动机的燃料喷射控制装置，其具有布置在其中的用于净化从发动机排出的废气中的NOx的排气通道和NOx催化剂的直接喷射型发动机，其包括用于将燃料喷射到气缸中的燃料喷射器。 燃料喷射器的喷射操作被控制为在发动机的动力冲程开始时最迟执行主燃料喷射。 控制燃料喷射器的喷射操作，以在主燃料喷射完成之后执行在发动机的动力冲程和排气冲程之一的次燃料喷射以增加废气中的烃的量。 控制燃料喷射器的喷射操作，以在主燃料喷射完成之后并且执行次燃料喷射之前执行附加的副燃料喷射。

公开(公告)号：US5473887A

公开(公告)日：1995-12-12

申请号：US66100

申请日：1993-06-14

申请人： Shinichi Takeshima ,  Kiyoshi Nakanishi ,  Satoshi Iguchi ,  Toshiaki Tanaka ,  Yasushi Araki ,  Shinya Hirota ,  Kiyoshi Kobashi

发明人： Shinichi Takeshima ,  Kiyoshi Nakanishi ,  Satoshi Iguchi ,  Toshiaki Tanaka ,  Yasushi Araki ,  Shinya Hirota ,  Kiyoshi Kobashi

IPC分类号： B01D53/04 ,  F01N3/08 ,  F01N3/20 ,  F01N9/00 ,  F01N13/02 ,  F02B1/04 ,  F02D41/02

CPC分类号： F02D41/0275 ,  B01D53/9422 ,  F01N13/009 ,  F01N13/0093 ,  F01N3/0842 ,  F01N3/101 ,  F01N2240/18 ,  F01N2390/02 ,  F01N2430/06 ,  F01N2610/03 ,  F01N3/0871 ,  F02B1/04 ,  Y02T10/22

摘要： An NO.sub.x absorbent (18) is disposed in an exhaust passage of an internal combustion engine and the exhaust gas is constantly made to circulate through the NO.sub.x absorbent (18) during the operation of the engine. The NO.sub.x absorbent (18) absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) becomes the stoichiometric air-fuel ratio or rich. In the majority of the engine operation region, the lean air-fuel mixture is burned in the combustion chamber (3), and the NO.sub.x generated at this time is absorbed into the NO.sub.x absorbent (18). The air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) is periodically made the stoichiometric air-fuel ratio or rich, and the NO.sub.x absorbed in the NO.sub.x absorbent (18) is released, and simultaneously reduced.

摘要翻译： PCT No.PCT / JP92 / 01279 Sec。 371日期：1993年6月14日 102（e）日期1993年6月14日PCT提交1992年10月2日PCT公布。 公开号WO93 / 07363 日本1999年04月15日。在内燃机的排气通道中设置有NOx吸收剂（18），并且在发动机运转期间不断地使废气循环通过NOx吸收剂（18）。 当流入NOx吸收剂（18）的排气的空燃比是稀的时，NOx吸收剂（18）吸收NOx，并且当流入NOx吸收剂的废气的空燃比释放吸收的NOx 18）成为化学计量空燃比或浓。 在大多数发动机运转区域，稀燃空气燃料混合物在燃烧室（3）中燃烧，此时产生的NOx被吸收到NOx吸收剂（18）中。 流入NOx吸收剂（18）的废气的空燃比被周期性地变成化学计量空燃比或浓，并且吸收在NOx吸收剂（18）中的NOx被释放，同时减少。

公开(公告)号：US07272924B2

公开(公告)日：2007-09-25

申请号：US11142329

申请日：2005-06-02

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/00

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

摘要翻译： 在内燃机的排气通道（18,21）中布置有适合于在过量氧气存在下用氨还原废气中的NO x的催化剂（22）。 尿素水溶液通过流量控制阀（33）进入催化剂（22）上游的排气通道（21）的内部。 当催化剂（22）的温度低时，进料大量的尿素水溶液使尿素水溶液中所含的尿素储存在催化剂（22）中。 当发动机加速并且催化剂（22）的温度上升时，氨从催化剂（22）的内部一次释放，排气中的NO x x 由释放的氨减少。

公开(公告)号：US07086222B2

公开(公告)日：2006-08-08

申请号：US11142242

申请日：2005-06-02

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/00

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

公开(公告)号：US20050262832A1

公开(公告)日：2005-12-01

申请号：US11142241

申请日：2005-06-02

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/08 ,  B01D53/90 ,  B01D53/94 ,  C01B21/00 ,  F01N3/00 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N11/00 ,  F01N13/02 ,  F01N13/04 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/12 ,  F02M25/06 ,  F02M25/07

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

公开(公告)号：US20050217249A1

公开(公告)日：2005-10-06

申请号：US11142467

申请日：2005-06-02

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/08 ,  B01D53/90 ,  B01D53/94 ,  C01B21/00 ,  F01N3/00 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N11/00 ,  F01N13/02 ,  F01N13/04 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/12 ,  F02M25/06 ,  F02M25/07 ,  F01N7/00

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOxin an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

摘要翻译： 在内燃机的排气通道（18,21）中布置有适合于在过量氧气存在下用氨还原废气中的NO x的催化剂（22）。 尿素水溶液通过流量控制阀（33）进入催化剂（22）上游的排气通道（21）的内部。 当催化剂（22）的温度低时，进料大量的尿素水溶液使尿素水溶液中所含的尿素储存在催化剂（22）中。 当发动机加速并且催化剂（22）的温度上升时，氨从催化剂（22）的内部一次释放，排气中的NO x x 由释放的氨减少。

公开(公告)号：US6021640A

公开(公告)日：2000-02-08

申请号：US201973

申请日：1998-12-01

申请人： Shinya Hirota ,  Toshiaki Tanaka ,  Satoshi Iguchi ,  Tatsuji Mizuno ,  Kazuya Kibe

发明人： Shinya Hirota ,  Toshiaki Tanaka ,  Satoshi Iguchi ,  Tatsuji Mizuno ,  Kazuya Kibe

IPC分类号： F01N3/08 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N3/36 ,  F01N9/00 ,  F01N3/10

CPC分类号： F01N3/2046 ,  F01N3/2006 ,  F01N3/2013 ,  F01N9/00 ,  F01N2240/02 ,  F01N2260/02 ,  F01N2260/022 ,  F01N2260/024 ,  F01N2570/14 ,  Y02T10/26 ,  Y02T10/47

摘要： According to the present invention, there is provided an exhaust gas purification device for an engine having an exhaust passage, the device comprising a catalyst arranged in the exhaust passage and having an upstream end and a downstream end, a purification ratio of exhaust gas by the catalyst becoming more than a predetermined ratio when a temperature of the catalyst is within a predetermined temperature range, cooling means for cooling the upstream end of the catalyst, heating means for heating the downstream end of the catalyst, and control means for controlling the cooling means and the heating means to maintain the temperature of a portion of the catalyst, which portion is positioned between the upstream end and the downstream end, in the predetermined temperature range.

摘要翻译： 根据本发明，提供一种用于具有排气通道的发动机的排气净化装置，该排气净化装置包括布置在排气通道中并具有上游端和下游端的催化剂，排气的净化比由 当催化剂的温度在预定的温度范围内时催化剂变得大于预定的比例，用于冷却催化剂的上游端的冷却装置，用于加热催化剂的下游端的加热装置，以及用于控制冷却装置的控制装置 以及加热装置，将该部分位于上游端和下游端之间的部分催化剂的温度保持在预定温度范围内。

公开(公告)号：US5934072A

公开(公告)日：1999-08-10

申请号：US19552

申请日：1998-02-06

申请人： Shinya Hirota ,  Toshiaki Tanaka ,  Tatsuji Mizuno

发明人： Shinya Hirota ,  Toshiaki Tanaka ,  Tatsuji Mizuno

IPC分类号： B01D53/86 ,  B01D53/94 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F02B1/04 ,  F02B23/10 ,  F02B37/18 ,  F02B75/12 ,  F02D9/04 ,  F02D21/08 ,  F02D41/02 ,  F02D41/34 ,  F02D41/40 ,  F02D43/00 ,  F02M25/07

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

摘要： An exhaust gas purifying device for an engine comprises an exhaust gas purifying catalyst arranged in the exhaust passage. The catalyst is capable of reducing NO.sub.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 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.sub.X in the catalyst.

摘要翻译： 用于发动机的废气净化装置包括布置在排气通道中的排气净化催化剂。 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脱附，然后还原催化剂中的NO x。

公开(公告)号：US07086223B2

公开(公告)日：2006-08-08

申请号：US11142467

申请日：2005-06-02

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/00

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

摘要翻译： 在内燃机的排气通道（18,21）中布置有适合于在过量氧气存在下用氨还原废气中的NO x的催化剂（22）。 尿素水溶液通过流量控制阀（33）进入催化剂（22）上游的排气通道（21）的内部。 当催化剂（22）的温度低时，进料大量的尿素水溶液使尿素水溶液中所含的尿素储存在催化剂（22）中。 当发动机加速并且催化剂（22）的温度上升时，氨从催化剂（22）的内部一次释放，排气中的NO x x 由释放的氨减少。

公开(公告)号：US06959540B2

公开(公告)日：2005-11-01

申请号：US10943946

申请日：2004-09-20

申请人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

发明人： Kazuhiro Itoh ,  Toshiaki Tanaka ,  Eiji Iwasaki ,  Shinya Hirota

IPC分类号： F01N3/08 ,  B01D53/90 ,  B01D53/94 ,  C01B21/00 ,  F01N3/00 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N11/00 ,  F01N13/02 ,  F01N13/04 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/12 ,  F02M25/06 ,  F02M25/07

CPC分类号： B01D53/9409 ,  B01D53/90 ,  B01D53/9431 ,  B01D53/9495 ,  B01D2251/2062 ,  F01N3/2053 ,  F01N3/206 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N13/011 ,  F01N2250/12 ,  F01N2510/063 ,  F01N2510/0682 ,  F01N2560/06 ,  F01N2570/14 ,  F01N2570/18 ,  F01N2610/02 ,  F01N2610/146 ,  F01N2900/08 ,  F01N2900/1402 ,  F01N2900/1622 ,  F02D35/025 ,  F02D41/0055 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1446 ,  F02D2200/0602 ,  F02D2200/0802 ,  F02M26/13 ,  F02M26/15 ,  Y02A50/2344 ,  Y02T10/24 ,  Y02T10/47

摘要： A catalyst (22) suitable for reduction of the NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NOx in the exhaust gas is reduced by the released ammonia.

摘要翻译： 在内燃机的排气通道（18,21）中布置有适合于在过量氧气存在下用氨还原废气中的NO x的催化剂（22）。 尿素水溶液通过流量控制阀（33）进入催化剂（22）上游的排气通道（21）的内部。 当催化剂（22）的温度低时，进料大量的尿素水溶液使尿素水溶液中所含的尿素储存在催化剂（22）中。 当发动机加速并且催化剂（22）的温度上升时，氨从催化剂（22）的内部一次释放，排气中的NO x x 由释放的氨减少。