Toyota Jidosha Kabushiki Kaisha

Toru Uenishi

Kohei Yoshida

Mikio Inoue

An exhaust gas control apparatus for an internal combustion engine includes an electromagnetic wave output unit, an acquisition unit that acquires collection amounts of PM and substances other than PM based on a rotational speed and a fuel injection amount of the internal combustion engine, and a control unit that controls an output intensity of the electromagnetic wave output unit. The control unit causes electromagnetic waves to be output with a first output intensity when the collection amount of the substances other than PM becomes equal to or smaller than a predetermined threshold, and causes electromagnetic waves to be output with a second output intensity that is lower than the first output intensity when the collection amount of the substances other than PM becomes larger than the predetermined threshold, when the collection amount of PM has exceeded a permissible value of the collection amount of PM in the filter.

Exhaust gas control apparatus for internal combustion engine

An internal combustion engine is provided with an engine body, a housing provided in an exhaust passage of the engine body, a filter held inside the housing and trapping PM in the exhaust, and a microwave device for microwaving the inside of the housing. A control device for the internal combustion engine is configured to control the microwave device when microwaving the inside of the housing to heat the PM so that an amplitude of the microwaves becomes smaller when the amount of PM deposition at the filter is large compared to when it is small.

Control device for internal combustion engine

In an internal combustion engine of the present invention, an exhaust purification catalyst () and a hydrocarbon supply valve () are disposed in an engine exhaust path, and NOcontained in exhaust gas is purified by injecting hydrocarbon from the hydrocarbon supply valve () at a predetermined cycle. With respect to the injection amount per unit time of the hydrocarbon from the hydrocarbon supply valve (), there is a difference provided between the first half and the second half of one injection time period, and in the first-half injection time period (Y), the injection amount per unit time of hydrocarbon is made to be less as compared to the second-half injection time period (X).

Exhaust purification system of internal combustion engine

In an engine, an exhaust purification catalyst () and a hydrocarbon feed valve () are arranged in an engine exhaust passage, and, a low pressure exhaust gas recirculation system (LPL) which makes exhaust gas downstream of the exhaust purification catalyst () recirculate is provided. If hydrocarbons are injected from the hydrocarbon feed valve (), a carbon dioxide which is generated at the exhaust purification catalyst () is recirculated, and the air-fuel ratio of the exhaust gas which flows into the exhaust purification catalyst () temporarily drops. Hydrocarbons are injected from the hydrocarbon feed valve () in synchronization with this temporary drop in the air-fuel ratio.

An exhaust purification system of an internal combustion engine is provided with a hydrocarbon feed valve arranged in an engine exhaust passage and an exhaust purification catalyst for causing NOcontained in exhaust gas and reformed hydrocarbons to react. The exhaust purification catalyst reduces NOif a concentration of inflowing hydrocarbons vibrates within a predetermined range of amplitude and within a predetermined range of period and increases the amount of storage of NOif the vibration period of the concentration of hydrocarbons longer is than a predetermined range. When hydrocarbons are being fed from the hydrocarbon feed valve within the predetermined range of amplitude and the predetermined range of period, if the amount of adsorption of hydrocarbons in the exhaust purification catalyst exceeds a predetermined judgment value of the adsorption amount, at least one of reducing amount of feed of hydrocarbons and lengthening feed interval of hydrocarbons is performed.

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Susono, Japan

Toru Uenishi