Toyota Jidosha Kabushiki Kaisha

Other

Denso Corporation

Cataler Corporation

Kabushiki Kaisha Toyota Jidoshokki

Nippon Soken, Inc.

Toyota Jidosha Kaisha

Toyoto Jidosh Kabushiki Kaisha

Shinya Hirota

Toshiaki Tanaka

Takamitsu Asanuma

Kazuhiro Itoh

Koichiro Nakatani

Shunsuke Toshioka

Koichi Kimura

Kohei Yoshida

Akira Mikami

Hiromasa Nishioka

Hiroshi Otsuki

Kenichi Tsujimoto

Satoshi Iguchi

Kotaro Hayashi

Eiji Iwasaki

Shinichi Takeshima

Yasushi Araki

Nobumoto Ohashi

Kouji Yoshizaki

Tomihisa Oda

Takanori Ueda

Mikio Inoue

Kiyoshi Nakanishi

Yoshinori Yamashita

Kiyoshi Kobashi

Kuniaki Niimi

Takafumi Yamauchi

Daisaku Sawada

Takeshi Takahashi

Makoto Suzuki

Shizuo Sasaki

Takashi Yamamoto

Hiroshi Fujimoto

Tokuta Inoue

Kenji Katoh

Yoshihisa Tsukamoto

Yasuaki Nakano

Koichiro Fukuda

Tatsuji Mizuno

Kazuya Kibe

Sakutaro Hoshi

Yoshimitsu Henda

Tetsuya Yamashita

Fumitada Murakami

Tomohiro Oda

Masahito Shibata

Hiroki Murata

Hideo Kobayashi

Makoto Koike

Kiyonori Sekiguchi

Ryoichi Hibino

Takekazu Ito

Satoshi Watanabe

Toshio Suematsu

Masato Gotoh

Takeshi Inoguchi

Kohei Igarashi

Michio Morishita

Toru Sasatani

Matsuei Ueda

Masatoshi Maruyama

Masakazu Sakata

Shinji Kamoshita

Shigeki Daido

Naohisa Oyama

Takashi Endo

Yukihiro Tsukasaki

Shigeru Arakawa

Satomi Seto

Junya Nakajima

Hiroyuki Tominaga

Akira Shichi

Takanori Nakano

Haruyuki Katayama

Kunio Komori

Shigeki Daidou

Souichi Matushita

Shigeru Itabashi

Masanori Takahashi

Kouji Toyoshima

Hiroyuki Nagareda

Akihiko Asano

Takio Suzuki

Yoshiyuki Ito

Haruo Ooishi

Shuji Watanabe

An exhaust gas control apparatus includes a control device controlling a urea addition valve for adding urea from an upstream side of a NOx reduction catalyst. The control device obtains an ammonia adsorption amount distribution through the NOx reduction catalyst. When an ammonia adsorption amount in a predetermined part on a downstream side equals or exceeds a predetermined threshold, the control device controls the urea addition valve to stop the urea supply or reduce the amount thereof. The urea addition valve is controlled based on an adsorption amount distribution obtained from a model on which the catalyst is divided into cells such that an ammonia adsorption amount in a first cell positioned furthest upstream equals or exceeds a predetermined threshold close to a saturation adsorption amount and an ammonia adsorption amount in a second cell positioned downstream of the first cell reaches a predetermined target value smaller than the threshold.

Exhaust gas control apparatus and control method for exhaust gas control apparatus

The purpose of the present invention is to suppress degradation of a PM sensor and a decrease in detection accuracy of the amount of PM in a configuration in which a urea addition unit and a selective reduction-type NOx catalyst (NOx catalyst) are provided downstream of a particulate filter (filter) in an internal combustion engine exhaust passage, the PM sensor being disposed downstream of the filter. According to the present invention, in an exhaust passage () of an internal combustion engine (), a first NOx catalyst () and a second NOx catalyst () are disposed downstream of a filter () successively from the upstream side along the flow of exhaust. A urea addition unit () is disposed between the filter () and the first NOx catalyst (). A PM sensor () is disposed between the first NOx catalyst () and the second NOx catalyst ().

Exhaust gas control apparatus for internal combustion engine

An exhaust gas purification system is equipped with a burner in an exhaust passage upstream of an exhaust gas purification apparatus and having a burner combustion chamber in which flame is produced. When the temperature of the exhaust gas purification apparatus is raised, the burner produces flame that extends from the interior of the burner combustion chamber to the interior of the exhaust passage when the flow rate of the exhaust gas is not higher than a predetermined flow rate, and the burner causes the size of the flame to be smaller than when it is determined that the flow rate of the exhaust gas is not higher than the predetermined flow rate or to produce flame only in the interior of the burner combustion chamber when it is determined that the flow rate of exhaust gas is higher than the predetermined flow rate.

Exhaust gas purification system for internal combustion engine

The present invention is intended to provide a technique which serves to suppress unburnt HC from being discharged to a downstream side, when fuel is injected from a fuel supply valve for removing clogging thereof. The present invention is provided with a fuel supply valve that supplies fuel to an exhaust passage of an internal combustion engine, and an ignition unit that ignites the fuel supplied from the fuel supply valve, wherein in cases where there is a possibility that clogging may occur in an injection hole of the fuel supply valve, fuel for removal of clogging is injected from the fuel supply valve. An amount of the fuel to be injected from the fuel supply valve for removing clogging thereof is an amount of fuel which is able to be combusted by being ignited by means of the ignition unit.

Exhaust gas temperature raising apparatus and a method for removal of fuel supply valve clogging

An exhaust purification system of an internal combustion engine is provided with a first NOselective reduction catalyst which is arranged inside of an engine exhaust passage and which selectively reduces NOby feed of a reducing agent, a second NOselective reduction catalyst which is arranged inside of the engine exhaust passage at the downstream side of the first NOselective reduction catalyst and which selectively reduces NOby feed of a reducing agent, and a reducing agent feed device which feeds a reducing agent to the first NOselective reduction catalyst. The system estimates the amount of adsorption of the reducing agent which is adsorbed at the second NOselective reduction catalyst and prevents the estimated amount of adsorption of the reducing agent from exceeding the allowable value by adjusting the amount of feed of reducing agent from the reducing agent feed device.

Exhaust purification system of internal combustion engine

An object of the present invention is to increase the flexibility in the layout of an exhaust gas purification system for an internal combustion engine including selective catalytic reduction catalyst provided in an exhaust passage of the internal combustion engine and an addition device for supplying reducing agent derived from ammonia to the selective catalytic reduction catalyst, without a deterioration of the performance in reducing nitrogen oxides. To achieve the object, the exhaust gas purification system for an internal combustion engine according to the present invention is configured to supply hydrocarbon at the same time when reducing agent derived from ammonia is supplied to the selective catalytic reduction catalyst, thereby producing reducing agent that is hard to be oxidized by a precious metal catalyst.

A NOx selective reduction catalyst for reducing NOx by the ammonia adsorbed is disposed in an engine exhaust gas passage. As states of adsorption of ammonia by the catalyst, there are a first adsorption state of ammonia that occurs when the ammonia is adsorbed during low temperature and a second adsorption state of ammonia that occurs when the ammonia is adsorbed or has already been adsorbed during high temperature. The amount of adsorbed ammonia in the first state is restricted to control concentration of the ammonia that is in the first state and desorbed when the temperature of the catalyst increases so as to be not higher than an allowable concentration, and that in the second state is restricted to control concentration of the ammonia that is in the second state and desorbed when the temperature of the catalyst increases so as to be not higher than an allowable concentration.

Exhaust gas control apparatus and method for internal combustion engine

Utilizing the finding that the state of adsorption of NHon a selective reduction type NOx catalyst includes a weakly adsorbed state in which the adsorbed NHis useful for a reduction reaction of NOx and a strongly adsorbed state in which the adsorbed NHis not useful for the reduction reaction of NOx unless the state of adsorption is changed into the weakly adsorbed state, the apparatus of the invention includes an actual weakly-adsorbed amount-calculation NHthat is adsorbed on the selective reduction type NOx catalyst in the weakly adsorbed state, and a dispensation control portion that performs a dispensation control of the reductant dispensed by a reductant-dispensation portion, according to the actual weakly adsorbed amount calculated by the actual weakly adsorbed amount calculation portion.

Exhaust gas control apparatus and reductant dispensing method for internal combustion engine

An exhaust purification apparatus for an internal combustion engine according to the present invention includes a heated gas generation apparatus configured to generate heated gas utilizing exhaust gas flowing through an exhaust passage. The heated gas generation apparatus includes a catalyst configured to provide an oxidation function, a fuel supply nozzle, and a heater. An exhaust purification unit is provided downstream of the heated gas generation apparatus. An incoming gas temperature of the exhaust purification unit is detected and estimated. An actual incoming gas temperature being a detected value and an estimated incoming gas temperature both acquired when at least the fuel supply nozzle is actuated are compared with each other. Based on the result of the comparison, the apparatus detects one of poisoning of the catalyst with HC and degradation of the catalyst. Thus, the heated gas generation apparatus is prevented from discharging HC.

Exhaust purification apparatus for internal combustion engine

An internal combustion engine in an engine exhaust passage of which an exhaust purification catalyst () having an oxidation function is arranged and in the engine exhaust passage upstream of the exhaust purification catalyst () of which a small-sized oxidation catalyst () and a fuel feed valve () for feeding fuel to the small-sized oxidation catalyst () are arranged. When activating the exhaust purification catalyst (), the fuel fed from the fuel injector () is used to heat the small-sized oxidation catalyst () and when the exhaust purification catalyst () is further raised in temperature, the fuel fed from the fuel feed valve () is increased and reformed fuel is exhausted from the small-sized oxidation catalyst ().

Exhaust purification device of internal combustion engine

An object is to provide a technology with which the temperature of exhaust gas can be raised with improved efficiency in cases where a catalyst apparatus including a catalyst having an oxidizing ability is provided in an exhaust passage of an internal combustion engine. According to the present invention, a catalyst apparatusthat is provided in the exhaust passageof the internal combustion engine and to which reducing agent is supplied from upstream when the temperature of the exhaust gas is to be raised is equipped with at least first and second catalystshaving an oxidizing ability. The first catalystis configured in such a way that the exhaust gas flows through a gap between its outer circumferential surface and the inner circumferential surface of the exhaust passage. The second catalystis disposed downstream of the first catalystwith a spacehaving a specific width Ws between it and the first catalyst

Catalyst apparatus and exhaust gas purification system for internal combustion engine

In an exhaust gas purification system for an internal combustion engine, a NOselective reduction catalyst for reducing NOwith ammonia that is adsorbed on the NOselective reduction catalyst is disposed in an exhaust passage of the engine. In the NOselective reduction catalyst, ammonia in a first adsorption state that is adsorbed at a low temperature and ammonia in a second adsorption state that is adsorbed at a high temperature are present. Because ammonia, which has been in the first adsorption state and which is desorbed from the NOselective reduction catalyst, tends to be discharged to the atmosphere, a control section that estimates an adsorption amount of ammonia in the first adsorption state is provided in the exhaust gas purification system for the internal combustion engine in order to control the adsorption amount of ammonia in the first adsorption state within a specified level.

A technique that, in an exhaust gas purification apparatus of an internal combustion engine, can avoid a decrease in a NOx purification rate by adding a reducing agent as continuously as possible, while avoiding NHfrom passing through a selective reduction type NOx catalyst to a downstream side thereof. The selective reduction type NOx catalyst has an active spot which purifies NOx by the use of NH, and an adsorption site which adsorbs NH, wherein a vicinity site, which is located in the vicinity of the active spot, and a distant site, which is located distant from the active spot, exist in the adsorption site. The addition of the reducing agent from the reducing agent addition part is controlled based on the desorption rate of NHin the vicinity site so as to continue to cause the NHadsorbed to the vicinity site to exist.

Exhaust gas purification apparatus of an internal combustion engine

In an internal combustion engine, an NOselective reduction catalyst () is arranged in an engine exhaust passage, and an NOstorage catalyst () is arranged in the engine exhaust passage upstream of the NOselective reduction catalyst (). When the amount of NOstored in the NOstorage catalyst () exceeds a predetermined allowable value, the NOstorage catalyst () is raised in temperature to make the NOstorage catalyst () release the NO. The amount of urea feed is decreased by exactly the amount of reduction of the calculated stored NOamount with respect to the amount of urea feed determined from the engine operating state, and the amount of urea feed is increased by exactly the amount of reduction of the calculated released NOamount with respect to the amount of urea feed determined from the engine operating state.

An internal combustion engine wherein an HC treatment catalyst () having the function of adsorbing the HC in the exhaust gas is arranged upstream of the NOx selective reducing catalyst (), an urea aqueous solution fed from the reducing agent feed valve () is arranged upstream of the HC treatment catalyst (), urea, and NOx contained in the exhaust gas, and HC adsorbed on the HC treatment catalystare reacted with each other to form intermediate products having cyano groups, oximes, and amino groups, and these intermediate products are sent to the NOx selective reducing catalyst ().

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Susono, Japan

Shinya Hirota