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公开(公告)号：US09617936B2
公开(公告)日：2017-04-11
申请号：US14910847
申请日：2014-06-27
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Yuki Haba , Kohei Yoshida , Yusuke Nozaki
CPC classification number: F02D41/0275 , F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N3/2066 , F01N3/208 , F01N2370/02 , F01N2430/06 , F01N2610/03 , F01N2900/0412 , F01N2900/0422 , F01N2900/1602 , F01N2900/1614 , F01N2900/1622 , F02D41/1454 , F02D41/1475 , F02D2200/0806 , F02D2200/0808 , Y02T10/24
Abstract: In an internal combustion engine, a hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOX removal method which injects hydrocarbons from the hydrocarbon feed valve within a predetermined range of period so that the reducing intermediate generated thereby reduces the NOX contained in the exhaust gas and a second NOX removal method which makes the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst a first target rich air-fuel ratio by a period which is longer than this predetermined range are used. When the NOX removal method is switched from the second NOX removal method to the first NOX removal method, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made a second target air-fuel ratio which is smaller than the first target rich air-fuel ratio.
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公开(公告)号：US09617893B2
公开(公告)日：2017-04-11
申请号：US14914386
申请日：2014-07-03
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Yuki Bisaiji , Kohei Yoshida , Yuki Haba , Yusuke Nozaki
CPC classification number: F01N3/2066 , F01N3/021 , F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N9/00 , F01N2240/30 , F01N2430/06 , F01N2560/06 , F01N2610/03 , F01N2900/08 , F01N2900/1402 , F01N2900/1602 , Y02T10/47
Abstract: In an internal combustion engine, a hydrocarbon feed valve and an exhaust purification catalyst are arranged in an engine exhaust passage. A first NOX removal method which reduces NOX contained in an exhaust gas by a reducing intermediate which is generated by injecting hydrocarbons from the hydrocarbon feed valve within a predetermined range of period and a second NOX removal method in which an air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made rich by a period which is longer than this predetermined range are used. The switching temperatures ST and ST0 of the exhaust purification catalyst at which temperature an NOX removal method is switched from the second NOX removal method to the first NOX removal method, are made lower if the amount of NOX in the exhaust gas flowing into the exhaust purification catalyst increases.
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公开(公告)号：US09631535B2
公开(公告)日：2017-04-25
申请号：US14911364
申请日：2014-07-03
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Yuki Haba , Yusuke Nozaki , Kohei Yoshida
CPC classification number: F01N3/0814 , F01N3/0842 , F01N3/0871 , F01N3/36 , F01N11/00 , F01N11/002 , F01N2610/03 , F01N2900/1602 , F01N2900/1614 , Y02C20/10 , Y02T10/47
Abstract: In an internal combustion engine, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged in an engine exhaust passage. When releasing the stored NOx from the exhaust purification catalyst (13), usually combustion gas of a rich air-fuel ratio is generated in the combustion chamber (2) to make the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (13) rich. When releasing the stored NOx from the exhaust purification catalyst (13) in case where the temperature of the exhaust purification catalyst (13) is low, the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (13) is made rich by injecting hydrocarbons from the hydrocarbon feed valve (15).
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