Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Yazaki Corporation

Toru Kidokoro

Yasushi Iwazaki

Hiroshi Sawada

Yoshihiko Hyodo

Kazuya Takaoka

Hiroshi Miyamoto

Fumihiko Nakamura

Koji Hagiwara

Makoto Ogiso

Takaaki Ito

Kenji Furui

Takaaki Itou

Akinori Osanai

Taiga Hagimoto

Daisuke Shibata

Arifumi Matsumoto

Takuji Matsubara

Hirokazu Nishijima

Kenji Sakurai

Mamoru Yoshioka

Kenji Suzuki

Yuji Miyoshi

Toshihisa Sugiyama

Takeru Shirasawa

Takahiko Fujiwara

Takaaki Itoh

Akifumi Uozumi

Hirotaka Saitoh

Keiichiro Aoki

Koichi Kimura

Naoya Takagi

Yukio Kinugasa

Hiroshi Kanai

Keizo Hiraku

Yusuke Nakayama

Yoshitaka Nakamura

Kunihiko Nakata

Yuki Terui

Yasuyuki Irisawa

Hideki Suzuki

Keiji Imamura

Yusuke Suzuki

Kunimitsu Aoki

Shuntaro Okazaki

Takashi Nakamura

Takashi Ishikawa

Koji Ide

Takayuki Otsuka

Takashi Shibata

Kazuyuki Sasaki

Tatsuhiro Hashida

Masahiko Masubuchi

Toshiki Annoura

Ichiro Kataoka

Takuya Matsumoto

Koichi Kitaura

Masahide Kobayashi

Takashi Miyake

Shinichiro Imamura

Hirotaka Saito

Koji Okawa

Yuriko Hagimoto

Yusuke Kawamura

Shinji Narama

Makoto Sato

Shozo Ashizawa

Kazuki Sato

Yuji Kanto

Shinichi Hoshino

Keizo Takahashi

Takao Iura

Taisuke Yoshida

Tatsuya Tsuji

Ryohei Ohno

Yuuji Kantou

Taiga Yamada

Tuyoshi Obuchi

Akihiko Itakura

Masanori Ishida

Shinya Taira

Yamato Nishijima

An information collection server obtains relevant information relating to legislation, regulations, or standards (vehicle emissions control) from an external server group and a local server and provides the obtained relevant information to an information processing server. When the information processing server receives the relevant information from the information collection server, it performs conversion processing on each piece of information included in the relevant information in accordance with each piece of information to convert each piece of information into an index relating to a degree of influence on revision of the emissions control. The information processing server provides each resultant index to a prediction creation server. When the prediction creation server receives each resultant index from the information processing server, it predicts a stage of revision of the emissions control based on each index.

Prediction system and prediction method

An abnormality diagnosis system of an air-fuel ratio sensor acquires a blowby gas flow ratio showing a ratio of the flow of blowby gas to the flow of gas to a combustion chamber and an output current of an air-fuel ratio sensor during fuel cut control in which an internal combustion engine stops the feed of fuel to the combustion chamber and at a plurality of points of time of different flows of blowby gas passing through a blowby gas passage and flowing to the downstream side of a throttle valve in the intake passage, calculate an output current of the air-fuel ratio sensor corresponding to a blowby gas flow ratio smaller than the blowby gas flow ratios acquired at the plurality of points of time, based on the acquired blowby gas flow ratio and output current, and judge the air-fuel ratio sensor for abnormality based on the calculated output current.

Abnormality diagnosis system of air-fuel ratio sensor

When an abnormality diagnosis of an SCR catalyst is carried out, diagnostic supply control is carried out in such a manner that the first estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined abnormal state, becomes equal to or more than a first predetermined adsorption amount, and the second estimated adsorption amount, which is an amount of adsorption of ammonia in the SCR catalyst at the time when the SCR catalyst is assumed to be in a predetermined normal state, becomes smaller than a second predetermined adsorption amount. Then, supply decreasing control to decrease an amount of adsorption of ammonia in the SCR catalyst is carried out, after the end of the execution of the diagnostic supply control.

Abnormality diagnosis system for an exhaust gas purification apparatus

In the abnormality diagnosis device which carries out an abnormality diagnosis of the reducing agent adding device by obtaining a diagnostic parameter which is a parameter correlated with an amount of pressure drop in a reducing agent passage in the case where, from a state in which an addition valve has been closed and in which a voltage to be applied to a pump is controlled to a diagnostic voltage so that the pressure in the reducing agent passage becomes a predetermined pressure, the addition valve is made to open in a state where the voltage to be applied to the pump is maintained at the diagnostic voltage, and by making a comparison between the diagnostic parameter and a predetermined threshold value, the abnormality diagnosis is carried out by using the diagnostic parameter or the predetermined threshold value which is corrected based on the pump discharge capacity of the pump.

Abnormality diagnosis device for reducing agent adding device

An exhaust gas sensor is diagnosed with high accuracy as much as possible while maintaining the function of an exhaust system of an internal combustion engine. In a diagnostic apparatus for an exhaust gas sensor which is applied to an internal combustion engine including an exhaust gas sensor, a fuel supplier, a controller configured to carry out predetermined fuel supply processing and predetermined oxygen concentration processing, and which diagnoses the exhaust gas sensor based on an output value thereof, provision is made for the controller that sets as a diagnostic output value a first output value, which is an output value at the side of the highest oxygen concentration in the output value of the exhaust gas sensor in a measurement period, and performs the diagnosis of the exhaust gas sensor based on the diagnostic output value, when predetermined fuel supply processing is carried out in the measurement period.

Diagnostic apparatus for exhaust gas sensor

An object is to prevent a wrong diagnosis from being made in diagnosis of an NOx sensor provided downstream of an SCR catalyst. A diagnosis apparatus is applied to an NOx sensor provided in an exhaust system including an SCR catalyst, a reducing agent supply device, an NOx sensor, an exhaust gas purification device provided upstream of the SCR catalyst, and a controller configured to raise the temperature of the exhaust gas purification device and control supply of reducing agent so as to adjust the ammonia adsorption amount to a specific amount. The controller is further configured to perform diagnosis of the NOx sensor on the basis of the concentration of ammonia slipping out of the SCR catalyst and disallow diagnosis of the NOx sensor since the ammonia adsorption amount is adjusted to the specific amount until a specific time elapses.

Diagnosis apparatus and diagnosis method for NOx sensor

An object of the disclosure is to provide a technology that enables abnormality diagnosis of an NOx trap catalyst to make the diagnosis that the NOx trap catalyst is abnormal even if the degree of deterioration of the NOx trap catalyst is relatively small yet. When performing abnormality diagnosis of an NOx trap catalyst, a system according to the disclosure performs a lean temperature raising process, which is the process of raising the temperature of the NOx trap catalyst to or above a predetermined temperature while keeping the air-fuel ratio of the exhaust gas flowing into the NOx trap catalyst at a lean air-fuel ratio. The system diagnoses abnormality of the NOx trap catalyst on the basis of the NOx storage efficiency of the NOx trap catalyst or a parameter correlating with that NOx storage efficiency after the completion of the lean temperature raise process.

Abnormality diagnosis system for exhaust gas purification apparatus

There is provided a technology pertaining to abnormality diagnosis of an NSR catalyst that enables the diagnosis that the NSR catalyst is abnormal to be made even when the degree of deterioration of the NSR catalyst is relatively small yet. An abnormality diagnosis apparatus is applied to an exhaust gas purification apparatus having an NSR catalyst and a fuel addition valve. The abnormality diagnosis apparatus includes a controller configured to perform a specific fuel addition process and diagnose the NSR catalyst. The controller starts the specific fuel addition process when the NSR catalyst is in a specific start condition, and diagnoses the NSR catalyst on the basis of the quantity of NOx flowing out of the NSR catalyst over a specific period in the period from when the specific fuel addition process is started to when the temperature of the NSR catalyst reaches the thermal desorption temperature.

Abnormality diagnosis apparatus for exhaust gas purification apparatus

An object is to prevent a wrong diagnosis from being made in an abnormality diagnosis apparatus for an exhaust gas purification system including a filter and a PM sensor. After sensor regeneration is performed, the application of voltage to the PM sensor is started, and thereafter abnormality diagnosis of the PM sensor is performed based on whether or not a signal is output from the PM sensor. Abnormality diagnosis of the filter is performed based on whether or not the output value of the PM sensor reaches a predetermined abnormality criterion value. If the output value of the PM sensor reaches the predetermined abnormality criterion value before a predetermined diagnosis completion time after the abnormality diagnosis of the PM sensor, the filter is diagnosed as abnormal, and the application of voltage to the PM sensor is stopped at that time.

Abnormality diagnosis apparatus for exhaust gas purification system

An amount of reducing agent adsorbed on a NOx catalyst when a reducing agent supply device is normal and a corresponding detected value may be estimated. The corresponding detected value may be detected by a NOx sensor, and the detected value may correspond to an amount of reducing agent adsorbed on the NOx catalyst. When the estimated amount of adsorption is larger than or equal to a first amount and is smaller than or equal to a second amount, a diagnosis of the NOx catalyst based on the detected value of the NOx sensor may be prevented. The first amount may be an amount of adsorbed reducing agent corresponding to a minimum value of the corresponding detected value. The second amount may be an amount of adsorbed reducing agent corresponding to the corresponding detected value when the amount of adsorbed reducing agent is zero and larger than the first amount.

Malfunction diagnosis apparatus and malfunction diagnosis method

The abnormality diagnosis system of an air-fuel ratio sensor comprising an exhaust purification catalyst, an upstream side air-fuel ratio sensor provided at an upstream side of the exhaust purification catalyst, a downstream air-fuel ratio sensor provided at a downstream side of the exhaust purification catalyst, and a diagnosis device diagnosing the downstream air-fuel ratio sensor for abnormality based on outputs of these air-fuel ratio sensors. The diagnosis device judges that the downstream air-fuel ratio sensor suffers from an abnormality if the output air-fuel ratio of the upstream side air-fuel ratio sensor has become a rich air-fuel ratio richer than a stoichiometric air-fuel ratio, and the output air-fuel ratio of the downstream air-fuel ratio sensor air-fuel ratio has changed from an air-fuel ratio richer than a lean judged reference air-fuel ratio to an air-fuel ratio leaner than the lead judged reference air-fuel ratio. As a result, it is possible to accurately diagnose an abnormality of a downstream air-fuel ratio sensor when using an air-fuel ratio sensor as a downstream side sensor.

An oil dilution rate calculation system of an internal combustion engine acquires a blowby gas flow ratio showing the ratio of the flow of blowby gas to the flow of gas to the combustion chamber and an output current of the air-fuel ratio sensor during fuel cut control in which the internal combustion engine stops the feed of fuel to the combustion chamber and at a plurality of points of time of different flows of blowby gas passing through the blowby gas passage and flowing to the downstream side of the throttle valve in the intake passage, and calculate an oil dilution rate based on the acquired blowby gas flow ratio and output current.

Oil dilution rate calculation system of internal combustion engine

An abnormality diagnosis system of an air-fuel ratio sensor is provided with an exhaust purification catalyst, an upstream side air-fuel ratio sensor which is provided at an upstream side of the exhaust purification catalyst, a downstream side air-fuel ratio sensor which is provided at a downstream side of the exhaust purification catalyst, and a diagnosis device which uses the outputs of these air-fuel ratio sensors as the basis to diagnose abnormality of the downstream side air-fuel ratio sensor.

The present invention provides a deterioration diagnosis apparatus for an exhaust gas purification apparatus, including a first sensor that measures the oxygen concentration of the exhaust gas flowing into the exhaust gas purification apparatus, a second sensor that measures the oxygen concentration of the exhaust gas flowing out of the exhaust gas purification apparatus, and diagnosing means for diagnosing deterioration of the exhaust gas purification apparatus on the basis of a difference that appears between a measurement value of the first sensor and a measurement value of the second sensor when the air-fuel ratio of the exhaust gas flowing into the exhaust pas purification apparatus is switched from a lean air-fuel ratio to a rich air-fuel ratio, wherein, when the air-fuel ratio of the exhaust gas is switched from a lean air-fuel ratio to a rich air-fuel ratio, a water-gas shift reaction is generated upstream of the first sensor.

Deterioration diagnosis apparatus for exhaust gas purification apparatus

In a failure diagnosis apparatus that carries out standard diagnosis processing in which a failure of the particulate filter is diagnosed by making a comparison between an output value of the PM sensor at the time when a predetermined period of time has passed from a point in time at which sensor regeneration processing for removing the particulate matter deposited on an insulation layer of the PM sensor has ended, and a predetermined threshold value, the standard diagnosis processing is carried out in the case where rich spike processing according to the in-cylinder rich control is not carried out during the predetermined period of time, whereas the rich spike processing according to the in-cylinder rich control is carried out during the predetermined period of time, the standard diagnosis processing is not carried out.

Failure diagnosis apparatus for an exhaust gas purification system

Growing community of inventors

Hadano, Japan

Toru Kidokoro