Toyota Jidosha Kabushiki Kaisha

Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd

Tetsuya Sakuma

Keishi Takada

Hiromasa Nishioka

Yasumasa Notake

Hiroshi Otsuki

Yoshihisa Tsukamoto

Hirohito Hirata

Takumi Suzuki

Naohiro Yamada

Yuji Sakakibara

Takashi Kuzuya

Tsuyoshi Hamaguchi

Yoshiyuki Sakamoto

Kiyoshi Fujihara

Chika Kato

Taiji Uchida

Keita Inoue

Masatoshi Katsuki

An electrochemical reactor is arranged inside an exhaust passage of an internal combustion engine and is provided with a plurality of groups of cells. Each group of cell has a plurality of cells, each cell has an ion conducting solid electrolyte layer, and an anode layer and cathode layer arranged on a surface of the solid electrolyte layer. Each group of cells is configured so that all of the exhaust gas flows into passages defined by cells configuring the group of cells and so that both of the anode layers and the cathode layers are exposed to each passage. The plurality of groups of cells are arranged aligned in a direction of flow of exhaust gas and different groups of cells are connected to a power source in parallel with each other.

Electrochemical reactor

An exhaust purification system of an internal combustion engine is provided with an electrochemical reactor provided in an exhaust passage of the internal combustion engine, and a voltage control device controlling a voltage supplied to the electrochemical reactor. The electrochemical reactor is provided with an ion conducting solid electrolyte layer and an anode layer and cathode layer placed on the surface of the solid electrolyte layer. The voltage control device is configured to perform short-circuit detection control detecting short-circuiting between the anode layer and the cathode layer, and energizing control applying current between the anode layer and the cathode layer so to energize the short-circuited part when short-circuiting is detected.

Exhaust purification system of internal combustion engine

An exhaust purification system includes an electrochemical reactor provided in an engine exhaust passage; a bypass passage bypassing the electrochemical reactor; a flow control valve controlling an amount of exhaust gas, discharged from an engine body, flowing into the electrochemical reactor and the bypass passage; and a control device controlling the flow control valve. The electrochemical reactor includes a holding material holding NOor HC and is configured so as to purify NOor HC held at the holding material if energized. The control device controls the flow control valve so as to control the amount of exhaust gas flowing into the electrochemical reactor so that a temperature of the electrochemical reactor is maintained at less than a desorption start temperature where NOor HC starts to be desorbed from the holding material.

The disclosure aims to attain further early activation of a catalytic substance in a catalytic device arranged in an exhaust passage of an internal combustion engine. A catalytic substance and a microwave absorber are included in a catalytic layer of the catalytic device which is irradiated with a microwave in the exhaust passage. Then, in the catalytic layer, the catalytic substance is carried or supported by the microwave absorber without through other substances.

Catalytic device and exhaust gas purification system

An exhaust after treatment system provided in an exhaust passage of an internal combustion engine, comprising an adsorption layer having the function of adsorbing hydrocarbons in the exhaust, a catalyst layer arranged at the same position as the adsorption layer in the direction of flow of exhaust or at the downstream side from the adsorption layer and having an oxidation function of oxidizing the hydrocarbons, and a thermal energy generator generating thermal energy, in the thermal energy generated by the thermal energy generator, the thermal energy supplied to the catalyst layer being made larger than the thermal energy supplied to the adsorption layer.

Exhaust after treatment system

An abnormality diagnosis apparatus includes an irradiation device to detect a resonance frequency by irradiating an electromagnetic wave to the NOx catalyst, and a controller to diagnose based on the resonance frequency whether the NOx catalyst is abnormal, wherein the NOx catalyst is arranged in such a position that an electric field strength inside the NOx catalyst at the time when the irradiation device irradiates the electromagnetic wave of the resonance frequency becomes larger in an upstream portion of the NOx catalyst, which is at the upstream side of a center of the NOx catalyst in the direction of flow of exhaust gas, than in a downstream portion of the NOx catalyst, which is at the downstream side of the center of the NOx catalyst.

Abnormality diagnosis apparatus

The NOx catalyst is irradiated with an electromagnetic wave, a resonance frequency and a ratio of a reception power to an oscillation power at the time of the irradiation are detected, and an upper limit value of a change amount of the resonance frequency or an upper limit value of a change amount of the ratio at which the NOx catalyst is diagnosed to be abnormal is determined from a change amount of the resonance frequency and a change amount of the ratio until water is adsorbed on all acid sites included in the NOx catalyst, and a change amount of the resonance frequency and a change amount of the ratio until ammonia is adsorbed on all acid sites included in the NOx catalyst, when it is supposed that the NOx catalyst is in a state of being on the borderline between normal and abnormal.

An electrochemical reactoris provided with a proton conductive solid electrolyte layer; an anode layerarranged on the surface of the solid electrolyte layer and able to hold water molecules; a cathode layerarranged on the surface of the solid electrolyte layer; and a current control devicecontrolling a current flowing through the anode layer and the cathode layer. The current control device reduces the current flowing through the anode layer and the cathode layer, when the water molecules held in the anode layer become smaller in amount.

Electrochemical reactor and internal combustion engine provided with electrochemical reactor

An internal combustion engineis provided, in an exhaust passage thereof with an electrochemical reactor including: an ion conductive solid electrolyte layer; an anode layer arranged on a surface of the solid electrolyte layer; and a cathode layer arranged on a surface of the solid electrolyte layer and able to hold NO. The engine includes a current control device for controlling the current supplied to the electrochemical reactor so as to flow from the anode layer through the solid electrolyte layer to the cathode layer. The current control device is configured so as to supply current to the electrochemical reactor at least temporarily while that internal combustion engine is stopped.

Internal combustion engine provided with electrochemical reactor and vehicle mounting internal combustion engine

An exhaust treatment catalyst () is arranged in the engine exhaust passage, and hydrogen generated in the reformer () is supplied through the hydrogen supply pipe () to the inside of the engine exhaust passage upstream of the exhaust treatment catalyst (). Heat exchange fins () for heat exchange with exhaust gas flowing through the inside of the engine exhaust passage are formed on the outer circumferential surface of the hydrogen supply pipe () inserted inside the engine exhaust passage.

Exhaust purification system of an internal combustion engine

An electrochemical reactor arranged in an exhaust passage of an internal combustion engine has a honeycomb member wherein a plurality of cells are formed. The honeycomb comprising an upstream and a downstream side partial honeycombs. The upstream side has a plurality of first and second cells arranged to at least partially adjoin the first cells through partition wall base members including an ion conductive solid electrolyte. The downstream side has a plurality of third and fourth cells arranged to at least partially adjoin the third cells through partition wall base members including an ion conductive solid electrolyte. The first and fourth cells have cathode layers, and second and third cells have anode layers. The electrochemical reactor is configured so all of the exhaust gas flowing through the first cells flows into the third cells and all of the exhaust gas flowing through the second cells flows into the fourth cells.

In cases where an adsorption amount of ammonia in the SCR catalyst is smaller than a predetermined target adsorption amount, when a condition of NObeing assumed not to flow into the SCR catalyst is satisfied, and when the temperature of the SCR catalyst falls within a temperature range (effective range) which is equal to or higher than a desorption temperature of ammonia adsorbed to the weak adsorption sites and which is less than a desorption temperature of ammonia adsorbed to the active sites, the adsorption of ammonia to the active sites is carried out, while suppressing the adsorption of ammonia to the weak adsorption sites, by supplying the additive agent to the SCR catalyst from a supply device.

Exhaust gas purification apparatus for an internal combustion engine

An exhaust gas control apparatus for an internal combustion engine includes: an SCR catalyst including transition metal ions for reducing NOin exhaust gas with NHas a reducing agent; detection means for detecting temperature of the SCR catalyst; and a heater configured to heat the SCR catalyst. When NOdoes not flow into the SCR catalyst, and the temperature detected by the detection means is below a first temperature that is a temperature causing exhibition of valence recovery of transition metal ions, the heater is controlled such that the SCR catalyst is heated up to a first temperature or above and that the SCR catalyst is maintained at or above the first temperature for a prescribed period so as to achieve valence recovery of the transition metal ions put in a deteriorated state.

Growing community of inventors

Gotemba, Japan

Tetsuya Sakuma