Patent
Control method for improving nitrogen oxide purification performance
Hyo Kyung Lee
- 23 Nov 2015
2
TL;DR: In this article, a control method for improving nitrogen oxide purification performance (NO x ) includes starting NO x regeneration, comparing first and second lambda values measured at first-and second lambda sensors in a control unit, checking the lean NO x trap (LNT) temperature, and measuring a second time that has elapsed after the first lambda values are found to be the same.
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Abstract: A control method for improving nitrogen oxide purification performance (NO x ) includes starting NO x regeneration, comparing first and second lambda values measured at first and second lambda sensors in a control unit, checking the lean NO x trap (LNT) temperature, and measuring a second time that has elapsed after the first and second lambda values are found to be the same, and checking whether the second time is greater than or equal to a predetermined time when it is observed that the temperature of the LNT is greater than or equal to the predetermined temperature value.
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Citations
Patent
Exhaust gas purification system for internal combustion engine, internal combustion engine, and exhaust gas purification method for internal combustion engine
Daiji Nagaoka
- 01 Feb 2016
TL;DR: In this article, the authors provided an exhaust gas purification system including a lean NOx trap catalyst device which was provided on an exhaust passage of an internal combustion engine, wherein a control unit for controlling the exhaust gas Purification system sets a desulfurization temperature Tt which is a target temperature in executing a desulurization control on the lean Nox Trap Cat catalyst device so as to correspond to an sulfur accumulation amount Sa in the NOx Trap catalyst device.
4
Patent
CO clean-up catalyst, after treatment system and after treatment method
Nahm Roh Joo,Chang H. Kim,Jung Changho +2 more
- 06 Aug 2020
TL;DR: In this article, an after treatment method was proposed to operate an engine at a lean air/fuel ratio, calculating an amount of NH3 stored in an SCR catalyst, and determining whether conversion to a rich air/ fuel ratio is desired.
References
Patent
Exhaust Gas Aftertreatment Installation and Method
Brigitte Bandl-Konrad,Andreas Hertzberg,Bernd Krutzsch,Arno Nolte,Markus Paule,Stefan Renfftlen,Norbert Waldbuesser,Michel Weibel,Guenther Dipl Ing Wenninger,Rolf Dr. Wunsch +9 more
- 16 Dec 2003
TL;DR: In this paper, an exhaust gas aftertreatment method was proposed for motor vehicle internal combustion engines and other engines which are operated predominantly in lean-burn mode, where a particulate filter was provided upstream of the nitrogen oxide storage catalytic converter or between the latter and the SCR catalytic converters.
230
Patent
Exhaust emission control system for internal combustion engine
Oi Akira,Nishizawa Toru +1 more
- 02 Nov 2006
TL;DR: In this paper, a diesel particulate filter (DPF) is constructed by putting a solid electrolyte film between an anode 21 and a cathode 22, which is electrochemically removed by supplying exhaust gas and air to the anode and the cathode.
171
Patent
Exhaust emission control device
Marutani Yoichi,Ashikaga Taigi,Fujimori Toshiro,Kurashina Mamoru +3 more
- 13 May 2010
TL;DR: In this article, an exhaust emission control device provided with the particulate filter 3 in an exhaust pipe 20 of a diesel engine 1 and with the burner device 18 raising temperature of the filter by injecting and burning fuel at an upstream of filter 3.
77
Patent
Exhaust emission control device for internal combustion engine
Goto Tsugumasa,Takamatsu Koji,Fujita Tomohiro +2 more
- 27 Apr 2006
TL;DR: In this paper, a front step catalyst converter and a rear step catalytic converter are provided in series in an exhaust passage, and an electronic control unit (ECU) 30 feedbacks air-fuel ratio to theoretical air fuel ratio based on detected values of the first and second oxygen sensors.
45
Patent
Method for treating NOx in exhaust gas and system therefore
Stephan Eckhoff,Ruediger Hoyer,Susanne Philipp,Ina Grisstede,Wilfried Mueller,Friedemann Rohr +5 more
- 10 Nov 2008
TL;DR: In this paper, a method for the treatment of an exhaust gas comprising NOx, wherein the method comprises the step of subjecting the exhaust gas to a treatment system comprising, in order of the exhaust stream: (a) a first NOx storage catalytic converter (2, 2' ); (b) a catalytic converter (3) for selective catalytic reduction (SCR) downstream of the first Nox storage catalyst; and (c) a catalyst (4) having oxygen storage capacity downstream of a SCR catalyst.
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