Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Other

Mitsubishi Jidosha Engineering Kabushiki Kaisha

Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Jidosha Kogyo K.k.

Kazuo Koga

Kojiro Okada

Yoshiaki Danno

Yasuki Tamura

Osamu Nakayama

Hiromitsu Ando

Tateo Kume

Michiyasu Yoshida

Daisuke Sanbayashi

Katsunori Kaneko

Hiroyuki Kimura

Kazuhide Togai

Osamu Hirako

Kazuhito Kawashima

Keisuke Kawamura

Taizo Kitada

Hiroki Oshima

Mitsutaka Kojima

Michihiro Hata

Yoshiaki Kodama

Kiyoshi Kawamura

Satoru Kume

Kei Shigahara

Mitsuhiro Kawagoe

Kazuto Maehara

Hajime Ishii

Tetsuya Watanabe

Norihisa Kobayashi

Kozo Iida

Kinichi Iwachido

Hiroshi Tanada

Keisuke Tashiro

Takashi Dogahara

Satoru Serizawa

Tomohiro Ohashi

Shiro Kumagai

Naoto Yamada

Takashi Dougahara

Shogo Ohmori

Norihiro Hukuda

Hiroshi Tanda

Miutsutaka Kojima

An exhaust gas purification device for an internal combustion engine comprises, an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.

Exhaust gas purification device for internal combustion engine

The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.

Exhaust gas purification device of internal combustion engine

An exhaust gas purifying apparatus of an internal combustion engine is provided which includes: exhaust gas purifying means, provided in an exhaust passage of the engine, for adsorbing NOin an exhaust gas when the air-fuel ratio of the exhaust gas is lean. The exhaust gas apparatus releases or reduces the adsorbed NOwhen the oxygen concentration of the exhaust gas is reduced. A light-off catalyst is provided upstream of the exhaust gas purifying apparatus in the exhaust passage, which has a lower Ostorage capability than the exhaust gas purifying apparatus. There is a control device for controlling the air-fuel ratio of the exhaust gas so that an atmosphere having a reduced oxygen concentration is produced around the exhaust gas purifying apparatus when the NOconversion efficiency of the exhaust gas purifying apparatus is decreased.

Exhaust gas purifying apparatus of internal combustion engine

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.

Exhaust gas purifying catalyst

An exhaust passage ( ) of an internal-combustion engine ( ) is provided with an exhaust emission control unit ( ) capable of reducing harmful substances in exhaust gas under a given exhaust pressure condition and an exhaust sensor ( ) for detecting the concentration of a specific exhaust component (H , O ) in the exhaust gas, and a performance lowering identifying unit identifies lowering of the performance of the exhaust emission control ( ) by detecting a failure to fulfill the given exhaust pressure condition in accordance with the output of the exhaust sensor.

Exhaust gas purifier for internal combustion engines

An exhaust gas purifying apparatus is provided which includes a three way catalyst provided in an exhaust pipe of an internal combustion engine; and a NOx adsorption/reduction catalyst provided in the exhaust pipe to be located downstream of the three way catalyst. Nickel serving as a catalyst source is loaded on an alumina support layer of the NOx adsorption/reduction catalyst. When the engine operates with a fuel-rich air/fuel mixture at a relatively small air-fuel ratio, a reducing atmosphere is formed around the NOx catalyst, and the reaction to convert NiO into NiS occurs, thereby to consume H S. As a result, consumption of SO proceeds, and the reaction to convert BaSO as an oxidized product of sulfur deposited on the NOx catalyst into BaCO as an NOx adsorbent is accelerated in an oxidizing atmosphere, thereby resuming the purifying capability of the NOx catalyst.

Exhaust gas purifying apparatus

An exhaust emission purifier includes a catalyst unit disposed in an exhaust pipe of an engine. Electrodes (reaction adjustment unit) are provided on a honeycomb carrier of the catalyst unit in a layered form in order to apply an electric field to the vicinity of the catalyst surface to thereby adjust the catalytic reaction. An ECU serves as a status detection unit to detect factors which affect the exhaust gas purifying performance of the catalyst unit (i.e., operating conditions), and serves as a control unit which controls the electric field applied by the electrodes, on the basis of the detected operating conditions.

Exhaust emission purifier

The present plasma type exhaust gas cleaning apparatus comprises a dielectric ( ) arranged between a discharge electrode ( ) and a ground electrode ( ). The dielectric has a plurality of independent cavities ( ) formed therein. The exhaust gas from combustion equipment ( ) flows through the interiors of the plurality of independent cavities ( ). Thus, in the plasma type exhaust gas cleaning apparatus, the discharge electrode ( ) and the ground electrode ( ) are securely partitioned by the cavities ( ). When a voltage from a high voltage generator ( ) is applied to between the discharge electrode ( ) and the ground electrode ( ), plasma resulting from corona discharges occurs in each individual cavity ( ) without arising directly across the discharge electrode ( ) and the ground electrode ( ). The exhaust gas is thereby cleaned up.

Plasma type exhaust gas cleaning apparatus

A plasma exhaust gas treatment device of the present invention senses the emission conditions of two kinds of harmful components, which are included in exhaust gas exhausted from a cylinder fuel injection engine, according to the operating state, finds an energy consumption required for a plasma generating device to purify a plurality of harmful components to a predetermined reference value or less, outputs control commands so as to a voltage controller to generate the maximum energy consumption, and removes the plurality of harmful components with the minimum power consumption.

Plasma exhaust gas treatment device

An exhaust purifying apparatus for an in-cylinder injection type internal combustion engine causes exhaust gas temperature to rise reliably, thereby desorbing reliably a sulfur component (SO,) adhered to an NO,catalyst and enhancing the durability of the NO,catalyst. For this reason, the exhaust purifying apparatus for an in-cylinder injection type internal combustion engine comprises an NO,catalyst (,A) for adhering NO,to itself in an excess oxygen concentration condition and desorbing NO,in an oxygen concentration reduction condition, and sulfur component desorption means (,) for desorbing a sulfur component from the NO,catalyst (,A). The sulfur component desorption means (,) injects additional fuel during an expansion stroke in addition to main injection and burns the additional fuel again so that exhaust gas temperature is raised to a predetermined temperature or beyond, whereby the sulfur component is desorbed.

Exhaust purifying apparatus for an in-cylinder injection type internal combustion engine

An exhaust gas heating system for an in-cylinder injection internal combustion engine is disclosed. The system includes a fuel injection device for injecting fuel directly into a combustion chamber of the engine, a spark plug for subjecting fuel, which has been injected as primary fuel from the injection device, to spark ignition such that the primary fuel undergoes primary combustion, an exhaust gas purification device arranged in an exhaust passage of the engine, a purification device temperature computing unit for determining a temperature of the purification device by detecting or estimating the temperature of the purification device, and an additional fuel injection control unit for controlling the injection device when the purification device is found to require activation from the temperature determined by the computing unit, such that an injection of fuel as additional fuel is performed during a flame lasting duration that a flame of the primary combustion remains. The control unit includes an injection timing setting unit for setting an injection start time of the additional fuel on a basis of a parameter which affects the flame lasting duration.

Exhaust gas heating system for in-cylinder injection internal combustion

An exhaust gas purifying apparatus, which is intended to improve hydrocarbon purifying performance and simplify the after-treatment of adsorbed hydrocarbon, an in which a three way valve 51 is operated under the control of a controller 80 to cause a bypass exhaust gas passage 30 to be communicated with a main exhaust gas passage, so that hydrocarbon in exhaust gas is adsorbed onto an adsorption catalyst 40 when the temperature of a three way catalyst 20 in the main exhaust gas passage 13 is low. When the three way catalyst temperature increases, the bypass exhaust gas passage is shut off from the main exhaust gas passage by the three way valve and the adsorption catalyst is heated by a heater 60, so that the adsorbed hydrocarbon is oxidized at the adsorption catalyst to form a harmless substance.

An apparatus for controlling an internal combustion engine having an exhaust purifying catalytic device which absorbs nitrogen oxides contained in exhaust when the engine is in a lean-combustion mode and which deoxidizes the absorbed nitrogen oxides when the engine is in a rich-combustion mode. The engine control apparatus includes an electronic control unit for estimating the amount of purifying capability reducing substances other than nitrogen oxides, which decreases the nitrogen oxide adsorbing ability of the catalytic device, absorbed by the catalytic device, on the basis of the accumulated value of vehicle travel distance, fuel consumption of engine, or intake air amount. The control unit changes the operating condition of engine so that the exhaust gas temperature is increased when it is judged that the estimated adsorption amount has reached a predetermined adsorption amount. The exhaust purifying catalytic device is heated by high-temperature exhaust gas to remove the purifying capability reducing substances from the catalytic device.

Apparatus and method for internal combustion engine control

In a control apparatus and control method for an internal combustion engine having an exhaust purifying catalytic device for adsorbing nitrogen oxide contained in exhaust gases from the engine, the adsorption state of nitrogen oxide adsorbed by the catalytic device is estimated by an electronic control unit during the lean-combustion driving of the engine. If the catalytic device is saturated with nitrogen oxide, the ignition timing is delayed and the exhaust gas is recirculated to the intake side of the engine with the lean air-fuel ratio kept unchanged. This starts the nitrogen oxide reduced driving mode for deteriorating the combustion state in the engine. At this time, the engine output will not change by a great amount. Further, a reducing atmosphere is created around the catalytic device by unburnt gases, generated due to the deterioration of the combustion state, to deoxidize the adsorbed nitrogen oxide. As a result, the purifying ability of the catalytic device can be recovered to suppress the discharge amount of nitrogen oxide without deteriorating the smoothness of engine driving and fuel economy.

Apparatus and method for internal-combustion engine control

An engine exhaust emission control system, in which a valve is set at a hydrocarbon adsorbing position to guide exhaust emissions to a bypass line including an adsorbent sieve for adsorbing hydrocarbons during a initial period of engine start-up, and the valve is switched over to a hydrocarbon purging position to guide exhaust emissions to an exhaust line and to divert a part of the exhaust emissions to the bypass line.

Engine exhaust emission control system

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Okazaki, Japan

Kazuo Koga