Honda Motor Co., Ltd.

Shinya Ishimaru

Katsuji Wada

Tetsuo Endo

Jun Iwamoto

Keizo Iwama

Yuichi Matsuo

Hitoshi Mikami

Kenji Dosaka

Masanobu Miki

Kenichi Shimizu

Go Motohashi

Yoshiyuki Nakanishi

Osami Yamamoto

Nobuhiro Komatsu

Tomoko Tsuyama

Hiroki Hosoe

Atsushi Satsuma

An exhaust purification device for an internal combustion engine is provided that can promote the reduction of NOx in a NOx purification catalyst from immediately after startup of the internal combustion engine. The exhaust purification device includes: a fuel reformer that is provided separately from exhaust plumbing, reforms fuel and produces a reducing gas that contains carbon monoxide, hydrogen and hydrocarbons, and supplies the reducing gas upstream of the NOx purification catalyst into the exhaust path; an exhaust gas temperature sensorthat detects a temperature Tof the exhaust flowing in the exhaust plumbing; and a reformer control partthat starts supply of the reducing gas to the exhaust plumbingby starting control of the fuel reformerin a case where the temperature Tthus detected by this exhaust gas temperature sensoris no higher than a predetermined first determination temperature T, and stops the supply of reducing gas to the exhaust plumbingby stopping control of the fuel reformerin a case where the temperature detected by the exhaust gas temperature sensoris at least a second determination temperature T, which is higher than the first determination temperature.

Exhaust purification device for internal combustion engine

Provided is a fuel reforming device, which can produce and supply a reformed gas in quick response to a demand for the reformed gas and which is so inexpensive as can be suitably mounted on a vehicle. The fuel reforming device feeds a material to a reforming catalyst and produces the reformed gas under a pressure higher than the atmospheric pressure. The fuel reforming device comprises a material supply means for supplying the material to the reforming catalyst, a reforming means having the reforming catalyst, for reforming the material supplied from the material supply means, to produce the reformed gas, and a run control means for controlling the run of the fuel reforming device. The run control means includes a stop mode, in which the drive of the material supply means is stopped to stop the production of the reformed gas, a reform mode, in which the material supply means is driven to produce the reformed gas, and a standby mode, in which the material supply means is driven and in which the temperature of the reforming catalyst is held within a predetermined range while producing the reformed gas as little as possible, so that the standby mode can shift instantly to the reform mode.

Fuel reforming device

An exhaust gas purification device for an internal combustion engine, in which a catalyst installed in an exhaust passage is quickly heated to the activation temperature of the catalyst. The exhaust gas purification device has a NOx purification catalyst () for adsorbing or occluding NOx in exhaust gas and reducing the NOx, a catalytic converter () installed at that position of an exhaust pipe () which is upstream of the NOx purification catalyst (), a fuel reformer () installed separately from the exhaust pipe (), producing a reformed gas, and supplying the reformed gas, as a reducing gas, into the exhaust pipe () from an introduction opening () formed in that portion of the exhaust pipe () which is upstream of the NOx purification catalyst () and the catalytic converter (), and an ECU () which, while the exhaust gas air-fuel ratio is being set to be lean, supplies the reducing gas into the exhaust pipe () and controls at least one of a throttle valve (), an EGR valve (), and a turbocharger () to regulate the flow rate of the exhaust gas flowing in the exhaust pipe ().

Exhaust gas purification device for internal combustion engine

Provided is an exhaust emission control device for an internal combustion engine capable of preventing NOx purification performance from degrading according to the operating condition. The exhaust emission control device comprises a NOx purification catalyst, a catalytic converter for continuously reducing the NOx in the exhaust emissions, a fuel reformer for reforming fuel to manufacture a reformed gas and supplying the reformed gas as the reducing gas from the upstream side of the NOx purification catalyst and the catalytic converter of the exhaust pipe, an operating condition detecting means for detecting the operating condition of an engine, and an enriching means for enriching the exhaust air-fuel ratio. The enriching means enriches the exhaust air-fuel ratio by supplying the reducing gas into the exhaust pipe by using the fuel reformer when the operating condition detected by the operating condition detecting means is a high-load operating condition.

Exhaust emission control device for internal combustion engine

Provided is an exhaust gas cleaner by which nitrogen oxides contained in an exhaust gas can be efficiently removed in a wide temperature range from a low temperature. The exhaust gas cleaner () is for use in purifying the exhaust gas discharged from an internal combustion engine () in which fuel is fed under periodical rich or lean conditions and burned. The cleaner () comprises: a reforming means () which generates a reforming gas comprising hydrogen and carbon monoxide; a means of low-temperature oxidation () which contains palladium and which thereby can oxidize and adsorb nitrogen oxides at low temperatures and oxidize the hydrogen and carbon monoxide; and a purifying means () which under lean conditions adsorbs nitrogen oxides and which under rich conditions releases the adsorbed nitrogen oxides and removes the released nitrogen oxides with the hydrogen and carbon monoxide present in the channel. By contriving the layout of the reforming means (), means of low-temperature oxidation (), and purifying means (), nitrogen oxides contained in an exhaust gas can be removed in a wide temperature range from a low temperature.

Exhaust gas cleaner

An exhaust gas purification system that is equipped, from an upstream side toward downstream side through which an exhaust gas flows, with a plasma reactor and a NOselective reduction catalyst unit having a NOselective reduction catalyst layer acting on the exhaust gas, and which system provides a reducing agent adding means adding a reducing agent to the exhaust gas at an upstream side of the plasma reactor, wherein the NOselective reduction catalyst layer comprises nickel and a NOselective reduction catalyst or wherein the NOselective reduction catalyst layer contains &#x3b3;-alumina that supports magnesium or wherein the NOselective reduction catalyst unit comprises a first purification unit where an exhaust gas via the plasma reactor is introduced, and a second purification unit where an exhaust gas via the first purification unit is introduced.

Exhaust gas purification system

An exhaust gas purification system equipped, from an upstream side toward downstream side through which an exhaust gas flows, with a plasma reactor and a catalyst unit charged with a catalyst acting on NOin the exhaust gas in this order, and equipped with a reducing agent supplying device to supply a reducing agent at an upstream side of the plasma reactor, wherein the catalyst has an NOadsorptive catalyst layer and an NOselective reduction catalyst layer contacting the NOadsorptive catalyst layer.

Growing community of inventors

Saitama, Japan

Shinya Ishimaru