Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Umicore Shokubai Japan Co., Ltd.

Ict Co., Ltd.

International Catalyst Technology, Inc.

Kinichi Iwachido

Tetsuya Watanabe

Osamu Nakayama

Hiromitsu Ando

Hiroshi Tanada

Keisuke Tashiro

Yasuki Tamura

Nobuaki Murakami

Katsuo Akishino

Osamu Hirako

Keizo Furukawa

Jun Takemura

Syunsuke Matsuo

Hiroaki Ohhara

Masayuki Motomochi

Taizo Kitada

Shogo Omori

Michihiro Hata

Ryosuke Sato

Masao Hori

Akihisa Okumura

Mariko Ono

Masanori Ide

Takayuki Onodera

Ken Tanabe

Katsuhiko Miyamoto

Masashi Takahashi

Kojiro Okada

Kazuo Koga

Kazuyoshi Nakane

Shigeo Yamamoto

Takashi Dogahara

Seiji Kikuchi

Hironobu Sato

Hiroshi Tanda

A filter is disposed on an exhaust path of the internal combustion engine to capture particulate matter exhausted from the internal combustion engine. A controller is caused to execute regeneration control that incinerates the particulate matter captured on the filter. The controller accomplishes the regeneration control by executing lean incineration control and stoichiometric incineration control in combination with each other. The lean incineration control incinerates the particulate matter, keeping an air-fuel ratio of the internal combustion engine to be leaner than a logical air-fuel ratio. The stoichiometric incineration control incinerates the particulate matter, oscillating the air-fuel ratio of the internal combustion engine about the logical air-fuel ratio as an average air-fuel ratio at a predetermined first cycle.

Exhaust controlling apparatus for internal combustion engine

An exhaust gas purification system for an engine includes an exhaust passage extending from the combustion chambers of the engine, and an exhaust purifying unit disposed in the exhaust passage and configured to purify exhaust gas in the exhaust passage. The exhaust purifying unit includes a carrier disposed in the exhaust passage, a first purifier having at least a function of oxidizing components in the exhaust gas. The first purifier covers, as an underlayer, an outer surface of the carrier, and a second purifier having a function of purifying the exhaust gas by reducing, using occluded ammonia, the components in the exhaust gas that have been oxidized in the first purifier. The second purifier includes a superposed portion covering, as an upper layer, an outer surface of the first purifier.

Exhaust gas purification system

A controlling device for purifying exhaust gas includes: a fuel cutting controller () that, if a predetermined condition for fuel cutting is satisfied, shuts off supply of fuel to an engine () after a predetermined delay time (B) elapses; a calculator () that calculates oxygen occludability of a catalyst () being interposed in an exhaust system of the engine () and containing an oxygen occludable material; and a setter () that sets a length of the delay time (B) in accordance with the oxygen occludability calculated by the calculator ().

Controlling device for purifying exhaust gas purifying

An object of at least one embodiment of the present invention is to suppress poisoning due to phosphorus derived from engine oil, and effectively purify NOx discharged from the time of engine start up to a high load condition. In an exhaust gas purification catalyst for an internal combustion engine, a catalyst layer includes: a first catalyst layer exposed to an exhaust gas flow; and a second catalyst layer formed between the first catalyst layer and the substrate. A second catalyst upstream layer formed on an upstream side of the second catalyst layer with respect to the exhaust gas flow and a first catalyst downstream layer formed on a downstream side of the first catalyst layer with respect to the exhaust gas flow include at least one of palladium and platinum, as well as an oxygen storage material as the catalyst component. An amount of the oxygen storage material in the first catalyst downstream layer is larger than an amount of the oxygen storage material in the second catalyst upstream layer.

Exhaust gas purification catalyst for internal combustion engine

A method of purifying an exhaust gas, includes: disposing a NOx trapping catalyst in an exhaust pipe of an internal combustion engine, the NOx trapping catalyst including: a metal substrate including cells, a corner portion of each of cells having an acute angle; and a catalyst layer supported in the metal substrate and including a noble metal, a heat-resistant inorganic oxide and a NOx trapping material, the catalyst layer having pores formed by addition of a pore formation promoting material, and the NOx trapping catalyst: adsorbing NOx in the exhaust gas when an exhaust air-fuel ratio is in a lean state; and desorbing and reducing the adsorbed NOx when the exhaust air-fuel ratio is in a stoichiometric state or a rich state; and removing the NOx by the exhaust air-fuel ratio being shifted between the lean state and the rich state.

Exhaust gas purifying method

An exhaust gas purifying catalyst which is disposed in an exhaust pipe of an internal combustion engine, includes: a substrate; and a catalyst layer, supported in the substrate and including: noble metals including platinum (Pt) and palladium (Pd); a heat-resistant inorganic oxide; and a NOx trapping material. The exhaust gas purifying catalyst adsorbs NOx in an exhaust gas when an exhaust air-fuel ratio is in a lean state and desorbs and reduces the adsorbed NOx when the exhaust air-fuel ratio is in a stoichiometric state or a rich state. (Pt/Pd) which is a ratio of amount of the platinum (Pt) to amount of the palladium (Pd) is 0.7 or more and less than 1.0.

Exhaust gas purifying catalyst

A fuel control device for an internal combustion engine determines that the internal combustion engine is in a transient state, by a criterion D, and makes fuel correction, where the transient-state criterion D is set to be a more relaxed criterion (=|&#x394;THaf|) when forcible modulation control is being performed, compared with a normal criterion (=|&#x394;THn|) used when the forcible modulation control is not being performed.

Fuel control device for internal combustion engine

By performing main fuel injection and sub fuel injection to perform rich operation of an engine, NOx purging of a NOx catalyst is carried out, and in the NOx purging, the ratio between the main fuel injection quantity and the sub fuel injection quantity is variably determined, within the range of 5:1 to 2:1 where the ratio of the sub fuel injection quantity is relatively great, such that the ratio of the sub fuel injection quantity is greater as the temperature of a three-way catalyst becomes higher.

Exhaust gas purification device for internal combustion engine

There is provided an exhaust emission purifying catalyst device which is comprised of a carrier disposed in an exhaust passage and including through holes passed through the carrier in an axial direction (flowing direction), and supporting layers made of fire-resistance inorganic oxide formed on inner surfaces of the through holes. The supporting layers support noble metal and NOtrapping agents which occlude NOin exhaust gas when the exhaust air-fuel ratio is lean, and emits and reduces the occluded NOwhen the exhaust air-fuel ratio is stoichiometric or rich. The amount of the supported noble metal is set to be smaller in an exhaust passage upstream area of the carrier than in an exhaust passage downstream area of the carrier.

Exhaust emission purifying catalyst device

A catalyst deterioration detecting apparatus aims at accurately determining whether or not a catalyst deteriorates even if a strict standard for catalyst deterioration is established. The catalyst deterioration detecting apparatus includes catalyst temperature sensing means for obtaining temperature of a catalyst, including ceria (CeO) serving as an oxygen storage agent, and deterioration detecting means for detecting a degree of deterioration of the catalyst if the temperature is obtained by the catalyst temperature sensing means is equal to or higher than an activation temperature at which the catalyst is activated and is in a particular temperature range causing NOconversion efficiency of the catalyst to decrease.

Catalyst deterioration detecting apparatus

The present invention provides an exhaust gas purifying catalyst that is capable of substantially reducing the degree of deterioration in an exhaust gas purifying capability, which results from dissipation of an absorbent agent. Accordingly, an exhaust gas purifying catalyst, which includes a carrier and a catalyst layer, and to which at least one material selected from a group of alkali metals and alkali earth metals is added as an absorbent agent, is characterized in that acid material with a high affinity with respect to the absorbent agent is mixed in the catalyst layer so as to fix the absorbent agent, and an inhibiting layer is formed between the catalyst layer and the carrier so as to inhibit the movement of the absorbent agent toward the carrier.

An exhaust gas clean-up catalyst having a catalytic layer which contains, as an occluding agent, at least one (potassium and/or the like) chosen from a group consisting of alkaline metals and alkaline earth metals. The catalytic layer consists of a first catalytic layer ( ) which contains the occluding agent (potassium and/or the like) and an acid material ( ) having a high affinity to the occluding agent, and a second catalytic layer ( ) which contains the occluding agent and does not contain the acid material.

Catalyst for exhaust gas purification

It is an object of the present invention to provide an exhaust gas purifying catalyst formed as a single catalyst that has a great deal of flexibility when being assembled into an exhaust system and that is capable of executing both an NOx absorbing function and a three-way function in a desired manner. To attain the this object, an absorbent catalyst layer to which an absorbent agent such as potassium and an acid material such as zeolite are added, an absorbent agent block layer formed of zeolite, and a three-way catalyst layer to which an acid material such as phosphorus is added are bonded together on a cordierite carrier. The acid material in the absorbent catalyst layer and the absorbent agent block layer inhibit the movement of the absorbent agent to the three-way catalyst layer, and transform the absorbent agent into harmless and stable potassium phosphate even if the absorbent agent reaches the three-way catalyst.

In an exhaust gas purifying catalyst, an acid material with a high affinity with respect to an absorbing agent is dispersed and mixed in a catalyst layer, to which the absorbing agent is added, or a layer of the acid material is formed inside the catalyst layer in order to prevent the absorbing agent from moving from the catalyst layer into the carrier. This reduces the permeation of the absorbing agent added to the catalyst layer into a carrier, the evaporation and splash of the absorbing agent from the catalyst, and the deterioration in the durability and the exhaust gas purifying performance of the catalyst.

Growing community of inventors

Aichi, Japan

Kinichi Iwachido