Toyota Jidosha Kabushiki Kaisha

Aisan Industry Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Nippon Soken, Inc.

Toyota Boshoku Kabushiki Kaisha

Denso Corporation

Yazaki Corporation

Nippon Steel Corporation

Kabushiki Kaisha Toyota Chuo Kenkyusho

Aisan Industry Col., Ltd.

Takaaki Itou

Yukio Kinugasa

Kouhei Igarashi

Kazuhiro Wakao

Hiroshi Tanaka

Naoto Suzuki

Keisuke Sano

Kimikazu Yoda

Toru Kidokoro

Takehisa Yaegashi

Kouji Uranishi

Yoshihiko Hyodo

Koichi Hoshi

Norihiko Nakamura

Kazuhiro Sakurai

Akinori Osanai

Kouji Yoshizaki

Toshifumi Takaoka

Takashi Katou

Koichi Takeuchi

Toshio Tanahashi

Kenji Katoh

Hiroki Ichinose

Takaaki Kanazawa

Kazuo Kikuchi

Toshihiko Igashira

Toshiaki Tanaka

Naohide Fuwa

Keiso Takeda

Tohru Yoshinaga

Hideki Suzuki

Kiyohiko Watanabe

Kouichi Oda

Toshihiro Takada

Koji Yokota

Tetsuo Nagami

Toshiki Annoura

Hidemi Ohnaka

Masakatsu Sanada

Minoru Honda

Masatami Takimoto

Masami Konishi

Yukihiro Shinohara

Yasuyuki Kawabe

Hiroshi Hirayama

Mitsuyoshi Teramura

Masahiro Mochizuki

Akihiro Izawa

Masahiko Ogai

Osamu Fujishiro

Kazuhisa Kunitake

Futaba Kanehira

Kouichi Takeuchi

Hiroaki Ichikawa

Kunimitsu Aoki

Naoya Takagi

Naoto Miyoshi

Yukihiro Yamamoto

Kazuo Yoshida

Sunao Kitamura

Michihiro Ohashi

Kenichi Harada

Kenji Harima

Kazuyuki Sasaki

Yukihiro Sonoda

Toshiharu Morino

Yusuke Nakayama

Ichiro Kataoka

Takeru Yasuda

Koji Okawa

Yasutaka Nagai

Takahiro Hayashi

Shuichi Kubo

Takuzou Kako

Shozo Ashizawa

Masahiro Taki

Shinji Narama

Yuuji Nakashima

Keiji Itou

Shinichi Hoshino

Yuushi Matsushita

Yoshiyuki Mandokoro

Koichi Takeuti

Kenichi Hirada

An ambient NOadsorption catalyst that can adsorb NOcontained in an exhaust gas in the presence of CO under standard conditions is placed in an engine exhaust gas passage, in an internal combustion engine. Until an engine post-initiation catalyst is activated, the amounts of a high-boiling-point hydrocarbon and an unsaturated hydrocarbon that are contained in the exhaust gas flowing into the catalyst are reduced so that the NO-adsorbing activity cannot be deteriorated by the adhesion activity of the hydrocarbons while maintaining the CO concentration in the exhaust gas flowing into the catalyst at a level higher than the concentration required for the adsorption of NO.

Exhaust purification device of internal combustion engine

An exhaust emission control system of an internal combustion engine includes: a bypass passage () provided in an exhaust passage () of the engine and arranged to bypass a main passage () as a part of the exhaust passage, a NOx adsorbent () provided in the bypass passage and adapted to adsorb at least NOx as one of components contained in exhaust gas, a channel switching device () that switches a channel of the exhaust gas between the main passage and the bypass passage, an adsorption control device () that controls the channel switching device, based on operating conditions of the engine, so as to cause the exhaust gas to flow through the bypass passage, and an adsorbing capability determining device () that determines, when the adsorbing capability of the NOx adsorbent degrades, whether the degradation in the adsorbing capability is a surmountable degradation from which the NOx adsorbent can recover, or an insurmountable degradation from which the NOx adsorbent cannot recover.

Exhaust emission control system of internal combustion engine

An exhaust gas purification device has: a bypass passage () disposed in an exhaust passage () of an internal combustion engine (); an adsorbent () which is disposed in the bypass passage (), and adsorbs unburned components in exhaust gas at a low temperature and desorbs the adsorbed unburned components at a high temperature; and an exhaust gas purification catalyst () which is disposed in the exhaust passage () at a downstream side of a portion where the bypass passage () merges, and purifies unburned components in exhaust gas; and a desorption amount adjustment () unit that adjusts the desorption amount of unburned components adsorbed by the adsorbent () based on an integrated fuel cut air amount (fgs), which is an integrated value of air amount taken into a combustion chamber of the internal combustion engine () during execution of fuel cut.

Exhaust gas purification device and exhaust gas purification method

An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can properly purge at least NOx of unpurified components contained in exhaust gas while considering characteristics of NOx desorbed from an adsorbent. A bypass passagebypassing a main exhaust passageof the internal combustion engineis provided. A HC/NOx adsorbenthaving a function of adsorbing HC and NOx is provided in the bypass passage. A second underfloor catalystis provided downstream of the adsorbent. A purge passagebranching off from the bypass passagewhile connecting to an intake passage is provided. An exhaust switching valveand a purge control valveare provided as a flow path switching means that is capable of switching a flow target into which the exhaust gas flows between the main exhaust passageand the bypass passage. If the purging operations are executed, the intake purging operation is first executed. After that, the intake purging operation is switched to the exhaust purging operation at a timing existing after the purge of NOx is completed and at the time point at which the temperature of the adsorbent becomes stable.

Exhaust gas purifying apparatus for internal combustion engine

A moisture adsorbent () for adsorbing moisture in exhaust gas and an NOx adsorbent () for adsorbing NOx are disposed in a bypass passage () for bypassing an exhaust passage () of an internal combustion engine (). When an adsorption operation to the NOx adsorbent () is executed, inflow of the exhaust gas to the bypass passage () is allowed until the moisture amount that flows into the water adsorbent () reaches an allowable moisture inflow amount. The allowable moisture inflow amount is determined based on a residual moisture amount before the starting of the adsorption operation in the moisture adsorbent (). The residual moisture amount in the water adsorbent () can be determined based on the temperature of the moisture adsorbent () at the immediately preceding execution of the purge operation.

Exhaust gas purification device and exhaust gas purification method for internal combustion engine

An exhaust gas purifying apparatus for an internal combustion engine is provided to desorb predetermined components contained in exhaust gas from an adsorption device for adsorbing the components and to purify the desorbed components, even during the stop of the internal combustion engine. A main exhaust passage and a bypass passage bypassing the main exhaust passage are provided. An exhaust switching valve is capable of switching a flow target into the exhaust gas flows between the main exhaust passage and the bypass passage. An adsorbent for adsorbing the predetermined components is provided in the bypass passage. An underfloor catalyst including a catalyst with a heater is provided at a downstream side of the bypass passage in the main exhaust passage. A pump and a heater are provided in an air supply passage which branches from the bypass passage at an upstream portion of the adsorbent.

A main exhaust passageand a first bypass passagebypassing the main exhaust passageare provided. An absorbenthaving a function of absorbing HC components and NOx components contained in exhaust gas is provided in the first bypass passage. An underfloor catalystincluding a catalyst with an electric heater (EHC)is provided in a main exhaust passageon a downstream side of a downstream connecting portionin a first bypass passage. A second bypass passagethat provides communication between the main exhaust passagedownstream of the underfloor catalystand the first bypass passageupstream of the absorbentis provided. A first exhaust switching valveis provided in an upstream connecting portion, and a second exhaust switching valveis provided in a main exhaust passage side connecting portion. A pumpis provided in the middle of the second bypass passage

A moisture adsorbing devicecomprising a type Y zeolite, and an NOadsorbing devicebeing put in place on an exhaust-gas downstream side of the moisture adsorbing device, and comprising a zeolite that includes a transition metal ion in the cation exchange sites are included. In NOadsorbing apparatuses, since the less the moisture content in exhaust gases is the more the NOadsorbing capability improves, the NO adsorbing capability in low-temperature region is improved especially by means of the combination with a moisture adsorbing device that comprises a type Y zeolite whose AlOproportion is great and whose moisture adsorbing amount is great compared with the other zeolites.

Exhaust-gas converting apparatus

The present invention relates to an exhaust emission control device having an NOx adsorbent, and makes it possible to judge whether the performance of the NOx adsorbent is degraded temporarily or permanently. The amounts of NOx and water adsorbed by the NOx adsorbent are measured during an actual operation of an internal combustion engine. A reference line indicating the correlation between a preselected water adsorption amount and NOx adsorption amount is then referenced to determine a reference value y0 of the NOx adsorption amount that corresponds to a measured value x1 of the water adsorption amount. Next, a measured value y1 of the NOx adsorption amount is compared against the reference value y0 to output a signal in which the result of the comparison is reflected.

Exhaust emission control device for internal combustion engine and performance diagnosis method for NOx adsorbent

According to an apparatus and method for determining degradation of a reforming catalyst degradation which reforms a mixture of air and fuel, in a reformer that supplies a reformate gas to an engine of a vehicle, a temperature sensor detects a temperature of a reforming reaction portion in which is provided a reforming catalyst. An ECU then determines the extent of degradation of the reforming catalyst based on the temperature detected by the temperature sensor.

Apparatus and method for determining reforming catalyst degradation

A fuel vapor adsorbing device () for adsorbing residual fuel vapors that remain in an intake conduit () of an induction system of an internal combustion engine when the internal combustion engine is stopped may include an adsorbing member (') that is constructed to adsorb the residual fuel vapors and is disposed along an inner wall surface of the intake conduit. The adsorbing member is arranged and constructed to form a supplemental intake path (T, T&#x2032;, T&#x2032;&#x2033;) between the adsorbing member and the inner wall surface of the intake conduit, so that intake air of the engine can flow through the supplemental intake path.

Fuel vapor adsorbing devices

An evaporative fuel adsorbent, which adsorbs evaporative fuel, is positioned substantially parallel to a sidewall surfaceof a surge tank. A retention memberis positioned between the sidewall surfaceand evaporative fuel adsorbentto prevent oil, which runs down on the sidewall surface, from adhering to the evaporative fuel adsorbent. The evaporative fuel adsorbentis mounted on the sidewall surfaceof the surge tankvia the retention member

Evaporative fuel adsorption device

An internal combustion engine in accordance with one aspect of the invention is characterized by comprising a combustion chamber, a reformer, and a control portion. A predetermined fuel component is burnt in the combustion chamber. The reformer has a reforming catalyst, and that produces a reformed gas which contains the fuel component obtained by reforming a mixture of fuel and air and which supplied to the combustion chamber. The control portion sets an air-fuel ratio of the mixture in the reformer such that a reforming efficiency of the reformer is held within a predetermined range, and sets an amount of the mixture supplied to the reformer such that an actual output torque of the internal combustion engine coincides with a target torque.

Internal combustion engine and method of operating internal combustion engine

A converter containing a NOx absorbing and reducing catalyst is disposed in the exhaust passage of an internal combustion engine. The upstream half portion (portion of the inlet side) of the substrate of the NOx absorbing and reducing catalyst in the converter carries the oxygen storage component that absorbs oxygen in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases the absorbed oxygen when the air-fuel ratio of the exhaust gas flowing in is rich in addition to carrying the NOx absorbing and reducing catalyst. After NOx is absorbed by the NOx absorbing and reducing catalyst as a result of operating the engine at a lean air-fuel ratio, the engine is operated at a rich air-fuel ratio, so that NOx is released from the NOx absorbing and reducing catalyst and is purified by reduction. Here, oxygen is released from the oxygen storage component carried by the upstream half portion of the substrate and is reacted with the H and CO components in the exhaust gas, so that the temperature of the NOx absorbing and reducing catalyst is raised within short periods of time due to the heat of reaction. Therefore, the catalyst exhibits increased activity and the NOx absorbing and reducing catalyst exhibits improved NOx purification capability.

Exhaust gas purification device for an internal combustion engine

The exhaust gas purification device according to the present invention utilizes two NO absorbents in order to remove NO from the exhaust gas of an engine operated at a lean air-fuel ratio. The NO absorbents are disposed, in series, in the exhaust passage of the engine and a nozzle for supplying a reducing agent is disposed in the exhaust passage at a position between the two NO absorbents. Further, the device includes switching valves for changing the direction of the exhaust gas flow in the exhaust gas passage. When the switching valves are set to direct the exhaust gas flow to one direction, the exhaust gas first flows through one of the NO absorbents (first NO absorbent), and after passing through the first NO absorbent, the reducing agent is supplied to the exhaust gas before it flows into the other NO absorbent (second NO absorbent). Thus, the first NO absorbent absorbs NO in the exhaust gas, and the NO absorbed by the second NOabsorbent is released from the second NO absorbent. When the switching valves are switched, the exhaust gas flows in the opposite direction, and flows through the second NO absorbent and the first NO absorbent in this order. In this case, the second NO absorbent absorbs NO in the exhaust gas, and the NO absorbed by the first NO absorbent is released and reduced to N . Therefore, by reversing the direction of the exhaust gas periodically, the absorbing operation of NO and releasing/reducing operation of NO are performed by two NO absorbents alternately. Thus, it becomes possible to remove NO in the exhaust gas continuously while the NO absorbents are prevented from being saturated by the absorbed NO .

Exhaust gas purification device for an engine

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Mishima, Japan

Takaaki Itou