Toyota Jidosha Kabushiki Kaisha

Exxonmobil Research and Engineering Company

Hino Motors, Ltd.

Tomihisa Oda

Shunsuke Toshioka

Kuniaki Niimi

Masaaki Sato

Takanori Ueda

Yutaka Tanai

Bungo Kawaguchi

Shinya Hirota

Kazuhiro Itoh

Kenichi Tsujimoto

Shinya Asaura

Takeru Shirasawa

Satoshi Kobayakawa

Tomoyuki Ono

Tomomi Onishi

Yasuo Harada

Takekazu Itoh

Takamitsu Asanuma

Takao Fukuma

Satoshi Watanabe

Yoshitaka Nakamura

Shinji Kamoshita

Kohei Yoshida

Shinya Sato

Masaaki Kobayashi

Daiki Yokoyama

Hiromasa Nishioka

Shigeki Nakayama

Hiroki Matsuoka

Hiroshi Otsuki

Makoto Ogiso

Walter Weissman

Randall David Partridge

Krishnan Kumaran

Daisuke Shibata

Keiji Yoeda

Naofumi Magarida

Kotaro Hayashi

Eiki Kitagawa

Yoshihiro Iwashita

Nobumoto Ohashi

Souichi Matsushita

Toshio Suematsu

Shinobu Ishiyama

Kouseki Sugiyama

Teruhiko Miyake

Akio Matsunaga

Takaharu Shimizu

Tametoshi Mizuta

Yukihiro Tsukasaki

Haruyuki Yokota

Akihiko Negami

Masaaki Satou

Shigeru Itabashi

Bhaskar Sengupta

Yasuhiro Ohtsubo

Takahiko Hayashi

Kuniaki Nimi

Masahiko Yabe

Takashi Karita

Yoshitsugu Suzuki

Hiroyuki Ninomiya

Akihiro Negami

Yasuhiko Ohtsubo

An exhaust passage includes a main passage and bypass passage, a catalyst, an exhaust control valve, and an HC adsorbent in the bypass passage. The exhaust control valve is controlled so that, when a temperature of the catalyst is higher than a predetermined sintering occurrence temperature, the quality of HC desorbed from the HC adsorbent is greater when the air-fuel ratio of the exhaust gas flowing through the upstream exhaust passage portion is a lean air-fuel ratio compared to when it is a stoichiometric air-fuel ratio or rich air-fuel ratio, or the quality of HC desorbed from the HC adsorbent is greater when the air-fuel ratio of the exhaust gas flowing through the upstream exhaust passage portion is a larger lean air-fuel ratio compared to when it is a smaller lean air-fuel ratio.

Control device for internal combustion engine

An exhaust purification system of an internal combustion engine comprises an HC adsorbentarranged adsorbing HC in exhaust gas, an NOx adsorbentadsorbing NOx in exhaust gas, a catalystremoving HC and NOx at a predetermined air-fuel ratio, an air-fuel ratio control partconfigured to control an air-fuel ratio of exhaust gas, and an HC concentration calculating partconfigured to calculate a concentration of HC desorbed from the HC adsorbent. A peak of a desorption temperature of HC at the HC adsorbent and a peak of a desorption temperature of NOx at the NOx adsorbent are substantially the same. The air-fuel ratio control part is configured to control an air-fuel ratio of inflowing exhaust gas flowing into the catalyst to the predetermined air-fuel ratio based on the concentration of HC calculated by the HC concentration calculating part when HC is desorbed from the HC adsorbent.

Exhaust purification system of internal combustion engine and exhaust purification method

A control device of an internal combustion engine is configured to output a predicted value of an output parameter by using a learning model if actually measured values of input parameters are input, control the internal combustion engine based on the predicted value of the output parameter, learn the learning model by using a gradient method and by using a combination of actually measured values of the input parameters and an actually measured value of the output parameter as teacher data, and adjust the learning rate so that the learning is performed by a smaller learning rate when an amount of noise superposed on an actually measured value of at least one parameter among the input parameters and the output parameter is relatively large compared with when the amount of noise superposed on the actually measured value of the parameter is relatively small.

Control device of internal combustion engine and control method of same and learning model for controlling internal combustion engine and learning method of same

An exhaust purification system of an internal combustion enginecomprises: an adsorbentadsorbing HC and NOx in exhaust gas, a catalystremoving HC and NOx, an air-fuel ratio control partconfigured to control an air-fuel ratio of exhaust gas discharged from an engine body of the internal combustion engine to the exhaust passage, and a temperature calculating partconfigured to calculate a temperature of the adsorbent. At the adsorbent, a desorption temperature of HC is higher than a desorption temperature of NOx. The air-fuel ratio control part is configured to make the air-fuel ratio a stoichiometric air-fuel ratio when a temperature of the adsorbent is in the vicinity of the desorption temperature of NOx, then make the air-fuel ratio leaner than the stoichiometric air-fuel ratio when the temperature of the adsorbent reaches the vicinity of the desorption temperature of HC.

An exhaust emission control device including a selective reduction catalyst; urea water as reducing agent being added in the pipe upstream of the reduction catalyst depurate NOthrough reduction; an oxidation catalyst arranged in the pipe upstream of an added position of the urea water, the oxidation catalyst physically adsorbing NOin the exhaust gas at a temperature lower than a lower active limit temperature of the reduction catalyst and discharging the adsorbed NOat a temperature higher than a lower active limit temperature of the oxidation catalyst; and a fuel injection device for adding fuel into the exhaust gas upstream of the oxidation catalyst is disclosed. The start of the fuel addition by the fuel injection device is refrained until exhaust temperature on an inlet side of the reduction catalyst is increased to a preset temperature comparable with the lower active limit temperature of the oxidation catalyst.

Exhaust emission control device

It is possible to decrease the amount of NOx emitted into the air. The amount of ammonia adsorbed on an SCR catalyst is calculated by subtracting the amount of ammonium nitrate produced on the SCR catalyst from the amount of ammonia adsorbed on the SCR catalyst at the time of starting of an internal combustion engine, and the amount of NOflowing into the SCR catalyst is decreased when an NOx purification rate estimated from the amount of ammonia adsorbed on the SCR catalyst is less than a threshold value compared to when the NOx purification rate is equal to or greater than the threshold value.

Exhaust gas control apparatus for internal combustion engine

The purpose is to prevent ammonia from flowing out of a NOx selective reduction catalyst when an air-fuel ratio of exhaust gas flowing into a NOx storage/reduction catalyst decreases. An NSR catalyst, a NOx sensor, and an SCR catalyst are provided in an exhaust passage in sequence from an upstream side, and a control apparatus is further provided to determine an amount of ammonia supplied to the NOx selective catalytic reduction catalyst on the basis of a detection value of the NOx sensor. When the air-fuel ratio of the exhaust gas flowing into the NOx storage/reduction catalyst is set at or below a stoichiometric air-fuel ratio, an amount of ammonia supplied from an ammonia supply apparatus relative to the detection value of the NOx sensor is decreased so as to be smaller than when the air-fuel ratio of the exhaust gas is larger than the stoichiometric air-fuel ratio.

Exhaust gas purification apparatus for internal combustion engine

The present invention discloses an exhaust gas purification system for an internal combustion engine, which is provided with: a low pressure EGR mechanism that is equipped with a low pressure EGR passage and a low pressure EGR valve; a selective reduction type catalyst that is arranged in a portion of the exhaust passage downstream; a supply device which serves to supply an ammonia derived compound to said selective reduction type catalyst; and a control unit that causes said supply device to supply the ammonia derived compound when said low pressure EGR valve is in a valve open state, makes the amount of the ammonia derived compound supplied from said supply device larger in cases where an amount of the low pressure EGR gas flowing through said low pressure EGR passage is large, in comparison with the case where it is small.

Exhaust gas purification system for an internal combustion engine

An exhaust gas purification system for an internal combustion engine, which is provided with: a selective reduction type catalyst arranged in an exhaust passage of the internal combustion engine; a low pressure EGR mechanism that is equipped with a low pressure EGR passage for introducing a part of an exhaust gas flowing through a portion of the exhaust passage downstream of a turbine of a centrifugal supercharger to a portion of an intake passage upstream of a compressor as a low pressure EGR gas, and a low pressure EGR valve for changing a channel cross section of the low pressure EGR passage; a supply device.

An exhaust purifying device for an internal combustion engine which can restrict an influence of a measurement error in a NOx sensor provided at the downstream side of a catalyst and can optimally maintain a NOx purifying rate. The device includes a catalytic converter carrying a selective catalytic reduction catalyst provided in an exhaust passage of the engine to selectively reduce nitrogen oxides, a urea water adding valve for adding urea water to the catalyst as a reducing agent, a NOx sensor provided at the downstream side of the catalyst, and an ECU for adjusting an addition amount of the urea water adding valve based upon output of the NOx sensor, wherein a urea water addition amount adjusting process is executed under a condition that a NOx amount to be generated in the engine increases.

Exhaust purifying device for internal combustion engines

An exhaust gas recirculation device of an engine () of the invention comprises a first exhaust gas recirculation passage () for connecting an exhaust passage () and an intake passage () to each other and introducing into the intake passage an exhaust gas discharged from a combustion chamber () to the exhaust passage, and a second exhaust gas recirculation passage () for connecting the exhaust passage upstream of a part of the exhaust passage connected to the first exhaust gas recirculation passage and the intake passage downstream of a part of the intake passage connected to the first exhaust gas recirculation passage to each other and introducing into the intake passage the exhaust gas discharged from the combustion chamber to the exhaust passage. The amount of the exhaust gas introduced into the intake passage via the first exhaust gas recirculation passage is controlled to a first target exhaust gas recirculation amount and the amount of the exhaust gas introduced into the intake passage via the second exhaust gas recirculation passage is controlled to a second target exhaust gas recirculation amount. The amount of exhaust gas introduced into the first and second exhaust gas passages is controlled in accordance with an allowable upper flame temperature.

Exhaust gas recirculation device of engine

The present invention provides an exhaust purification apparatus for an internal combustion engine which enables a decrease in NOx purification rate and possible ammonia slip to be inhibited. The apparatus includes an NOx catalyst, a urea aqueous solution addition valve serving as reducing agent adding means, and NOx sensors provided an inlet and an outlet of the NOx catalyst, respectively. When the bed temperature of the NOx catalyst is in a predetermined high-temperature region in which the amount of ammonia converted into NOx increases relatively and an NOx purification rate decreases relatively, the apparatus uses outputs from the NOx sensors to perform correction such that the actual addition amount of the urea aqueous solution addition valve reaches a target addition amount.

Exhaust purification apparatus for internal combustion engine

An internal combustion engine, in which an NOselective reducing catalyst () is arranged inside an engine exhaust passage, and aqueous urea stored in an aqueous urea tank () is fed to the NOselective reducing catalyst () to selectively reduce the NO. The aqueous urea tank () comprises a main tank () and a sub tank () arranged inside the main tank (). The aqueous urea in the sub tank () is sent to an aqueous urea feed valve (). When the aqueous urea tank () should be refilled with aqueous urea, the sub tank () is refilled with aqueous urea. It is detected by a level sensor () if the aqueous urea in the aqueous urea tank () is refilled. When it is judged that the NOpurification rate falls below an allowable level at the time of engine operation right after the aqueous urea in the aqueous urea tank () has been refilled, it is judged that the refilled aqueous urea is abnormal.

Exhaust purification device of an internal combustion engine

In an internal combustion engine, an NOselective reducing catalyst is arranged in an engine exhaust passage. Urea is fed in the NOselective reducing catalyst, ammonia generated from this urea is adsorbed at the NOselective reducing catalyst, and the NOcontained in the exhaust gas is selectively reduced mainly by the adsorbed ammonia. An NOsensor able to detect NOand ammonia contained in the exhaust gas is arranged in the engine exhaust passage downstream of the NOselective reducing catalyst. It is judged that the amount of adsorption of ammonia at the NOselective reducing catalyst is saturated based on the detection value of the NOsensor when the feed of fuel to the engine is stopped during the deceleration operation.

In an internal combustion engine, an NOselective reduction catalyst () is arranged in an engine exhaust passage, and an NOstorage catalyst () is arranged in the engine exhaust passage upstream of the NOselective reduction catalyst (). When the amount of NOstored in the NOstorage catalyst () exceeds a predetermined allowable value, the NOstorage catalyst () is raised in temperature to make the NOstorage catalyst () release the NO. The amount of urea feed is decreased by exactly the amount of reduction of the calculated stored NOamount with respect to the amount of urea feed determined from the engine operating state, and the amount of urea feed is increased by exactly the amount of reduction of the calculated released NOamount with respect to the amount of urea feed determined from the engine operating state.

Exhaust purification device of internal combustion engine

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Numazu, Japan

Tomihisa Oda