Patent
Device for purifying exhaust of internal combustion engine
Shinichi Takeshima,Kiyoshi Nakanishi,Satoshi Iguchi,Toshiaki Tanaka,Yasushi Araki,Shinya Hirota,Kiyoshi Kobashi +6 more
TLDR
In this paper, the authors describe a system in which NOx absorbent (18) absorbs NOx when an air-fuel ratio of exhaust gas flowing into said absorbent is lean and discharges NOx having been absorbed therein.Abstract:
NOx absorbent (18) is disposed in the exhaust gas path in the internal combustion engine and exhaust gas is adapted to flow constantly through said absorbent (18) during the operation of said engine. NOx absorbent (18) absorbs NOx when an air-fuel ratio of exhaust gas flowing into said absorbent (18) is lean and, when an air-fuel ratio of exhaust gas becomes equal to the theoretical air-fuel ratio or rich, it discharges NOx having been absorbed therein. Over almost the entire range of operation of the engine, lean mixed gas is burnt in the combustion chamber (3) and NOx generated at this time is absorbed by said absorbent (18). An air-fuel ratio of exhaust gas flowing into the NOx absorbent (18) is periodically made equal to the theoretical one or rich and NOx having been absorbed by the absorbent (18) is discharged and reduced at the same time.read more
Citations
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Patent
Exhaust gas purification device for an internal combustion engine
TL;DR: In this article, a converter containing a NOx absorbing and reducing catalyst is disposed in the exhaust passage of an internal combustion engine, where the upstream half portion (portion of the inlet side) of the substrate carries the oxygen storage component that absorbs oxygen in exhaust gas and releases the absorbed oxygen when the air-fuel ratio of the exhaust gas flowing in is rich.
Patent
Air-fuel ratio control system for internal combustion engines
Ken Ogawa,Yasunori Ehara +1 more
TL;DR: An air-fuel ratio control system for an internal combustion engine includes a LAF sensor and an O2 sensor arranged in an exhaust pipe at respective locations upstream and downstream of a catalytic converter.
Patent
Exhaust purification device of internal combustion engine
Kenichi Tsujimoto,Shinya Hirota +1 more
TL;DR: In this article, an internal combustion engine with an HC treatment catalyst having the function of adsorbing the HC in the exhaust gas is arranged upstream of the NOx selective reducing catalyst.
Patent
Exhaust gas purification apparatus for an internal combustion engine
Kenji Katoh,Shinichi Takeshima,Toshiaki Tanaka,Satoshi Iguchi,Masato Goto,Tetsuro Kihara,Takamitsu Asanuma,Fumitada Murakami +7 more
TL;DR: In this paper, an NOx absorbent (6, 6A) is installed in an exhaust conduit of an internal combustion engine capable of fuel combustion at lean air-fuel ratios.
Patent
Exhaust gas purification device for an engine
TL;DR: In this paper, the authors 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.
References
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Patent
Exhaust gas purification system for an internal combustion engine
TL;DR: In this paper, a dual passage exhaust gas purification system for an internal combustion engine includes a first passage and a second passage which are connected in parallel to each other, and a flow switching valve is provided so as to switch the flow of exhaust gas between the first and second passage.
Patent
Nitrogen oxides decreasing apparatus for an internal combustion engine
Yujiro C,O K. K. Toyota Chuo Kenkyusho Oshima,Hideaki C,O K. K. Toyota Chuo Kenkyusho Muraki,Koji C,O K. K. Toyota Chuo Kenkyusho Yokota,Kiyoshi C,O Toyota Jidosha K. K. Nakanishi +7 more
TL;DR: In this article, a heater is switched on to increase the temperature of NOx adsorption and release material above a predetermined temperature, for example, 500°C, to release absorbed NOx and is regenerated.
Patent
Improvements in pollution control
TL;DR: In this article, a novel exhaust catalyst for this purpose is carried by a washcoat and is capable of oxidising hydrocarbons and carbon monoxide and reducing NOx to nitrogen and contains in addition 0.1 - 20% by weight of iron based on the total weight of catalyst and washcoat.
Patent
Catalyst for purifying exhaust gas
TL;DR: In this article, the authors proposed a low-temperature catalysts for purifying exhaust gases, having smaller thermal expansion coefficients than conventional catalysts, good mechanical strength and large specific surface area.