Toyota Jidosha Kabushiki Kaisha

Kiyoshi Fujiwara

Hiromasa Nishioka

Shinichi Takeshima

Daichi Imai

Yoshio Yamashita

Takashi Koyama

Tomohiro Kaneko

Hisashi Ohki

Kouta Tanaka

Yuji Miyoshi

Takafumi Yamada

Hajime Shimizu

Masahiro Nagae

Seiji Ogura

Takahumi Yamada

A burner combustion chamber (), a reformer catalyst () to which burner combustion gas is fed, and a heat exchange part () for heating the air fed to the burner () are provided. When the temperature of the reformer catalyst () exceeds the allowable catalyst temperature (TX) or when it is predicted the temperature of the reformer catalyst () will exceed the allowable catalyst temperature (TX), the air circulation route for guiding air to the burner () is switched from a high temperature air circulation route () for guiding air heated by the heat exchange part () to the burner () to a low temperature air circulation route () for guiding air not flowing within the heat exchange part () and lower in temperature than the air heated at the heat exchange part () to the burner ().

Heat and hydrogen generation device with ECU controlling air feed device

An exhaust purification system of an internal combustion engine comprising at least two exhaust treatment catalysts arranged in an engine exhaust passage, a hydrogen feed source, and a plurality of hydrogen feed passages for feeding hydrogen from the hydrogen feed source to the exhaust treatment catalysts. When warming up the exhaust treatment catalysts, hydrogen is fed from the hydrogen feed source through the corresponding hydrogen feed passage to the exhaust treatment catalyst with the larger rise of the exhaust removal rate when hydrogen is fed among the exhaust treatment catalysts.

Exhaust purification system of internal combustion engine

An exhaust gas control system for an internal combustion engine, before execution of a filter regeneration process, executes a pre-regeneration process that is a process of raising a temperature of a filter to a second target temperature lower than a first target temperature and increasing the concentration of NO2 contained in exhaust gas flowing into the filter for a predetermined period. The first target temperature during execution of the filter regeneration process in the case where a speed of change in a detected value of a differential pressure sensor during execution of the pre-regeneration process is high is set so as to be lower than the first target temperature in the case where the speed of change is low.

Exhaust gas control system for internal combustion engine

An exhaust gas control system for an internal combustion engine, before execution of a filter regeneration process, executes a pre-regeneration process that is a process of raising a temperature of a filter to a second target temperature lower than a first target temperature and increasing the concentration of NOcontained in exhaust gas flowing into the filter for a predetermined period. An execution time of the filter regeneration process when a physical quantity that correlates with a speed of change in a detected value of a differential pressure sensor during execution of the pre-regeneration process is large is shorter than an execution time of the filter regeneration process when the physical quantity is small.

An exhaust treatment catalyst () arranged in an engine exhaust passage and a heat and hydrogen generation device () are provided. The amount of fuel fed to the heat and hydrogen generation device (), which is required for making the temperature of the exhaust treatment catalyst () rise by exactly a predetermined temperature rise by heat and hydrogen fed from the heat and hydrogen generation device () when the exhaust treatment catalyst () is not poisoned and does not thermally deteriorate, is calculated based on the amount of exhaust gas. When fuel of the reference feed fuel amount corresponding to the amount of exhaust gas is fed to the heat and hydrogen generation device () and the temperature rise of the exhaust treatment catalyst () fails to reach the predetermined temperature rise, the treatment for restoration from poisoning of the exhaust treatment catalyst () is performed.

An exhaust purification system of an internal combustion engine comprising an exhaust treatment catalyst () arranged in an engine exhaust passage and a heat and hydrogen generation device () able to feed only heat or heat and hydrogen to the exhaust treatment catalyst (). When the warm-up operation of the heat and hydrogen generation device () is completed and a reforming action by a reformer catalyst () becomes possible, if the temperature of the exhaust treatment catalyst () is a preset activation temperature or more, a partial oxidation reaction is performed at the heat and hydrogen generation device () and the generated heat and hydrogen are fed to the exhaust treatment catalyst (). At this time, if the temperature of the exhaust treatment catalyst () is less than the preset activation temperature, a complete oxidation reaction by a lean air-fuel ratio is continued and a heat is fed to the exhaust treatment catalyst ().

An exhaust emission control system of an internal combustion engine may include a filter, a temperature raising device, a differential pressure detecting device, and an electronic control unit. The filter may include a first region as a part of the filter, and a second region as another part of the filter. The electronic control unit may be configured to calculate a first deposition amount such that a calculated deposition amount is larger as a proportion of a magnitude of the first differential pressure reduction amount to the length of the first oxidation period is larger. The electronic control unit may be configured to calculate an amount of the particulate matter deposited in the second region based on a length of the second oxidation period and a second differential pressure reduction amount.

Exhaust emission control system of internal combustion engine

An object of the present invention is to control the discharge amount of unburned fuel components in the internal combustion engine. According the present invention, the number of times of execution of sub fuel injection is changed based on the operation range within which the operation state of the internal combustion engine falls so that the lower the engine load of the internal combustion engine is, and the lower the number of engine revolutions of the internal combustion engine is, the more the number of times of execution of sub fuel injection is increased. Furthermore, the lower the atmospheric pressure is, the lower the temperature of the cooling water of the internal combustion engine is, or the lower the temperature of the intake air of the internal combustion engine is, the more an operation range in which the number of times of execution of sub fuel injection is large is expanded to higher loads and higher revolutions.

Fuel injection system of compression ignition internal combustion engine

A fuel injection valve coupled to a common rail is provided. When fuel injection is carried out, the fuel pressure in the fuel injection valve pulsates. An interval between a pilot injection and a main injection is set so that the main injection is carried out at a zero gradient timing as a timing when the gradient of the fuel pressure in the fuel injection valve after the pilot injection is approximately equal to zero. Owing to a fuel injection control apparatus and a fuel injection control method for an internal combustion engine that perform the above-mentioned control, the fuel injection amount for the subsequent fuel injection following the preceding fuel injection can be reliably held equal to a normal amount.

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Susono, Japan

Kiyoshi Fujiwara