Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Japan Fine Ceramics Center

The Ritsumeikan Trust

Toyota Jidosha Kaisha

Nippon Soken, Inc.

Keiichiro Aoki

Kazuhiro Wakao

Go Hayashita

Yasushi Iwazaki

Hiroshi Miyamoto

Kazuhisa Matsuda

Takanori Sasaki

Tatsuhiro Hashida

Hiroshi Sawada

Hiroki Nishijima

Koji Ide

Toyoharu Kaneko

Yoshihisa Serizawa

Yoichi Kurebayashi

Toru Kidokoro

Keigo Mizutani

Fumihiko Nakamura

Yasutaka Kamiya

Hiroshi Kobayashi

Toshihiro Mori

Yusuke Suzuki

Yasuo Ito

Kimikazu Yoda

Shinya Teranishi

Yoshiyuki Kitazume

Taro Ueda

Seiji Takahashi

Kazuki Takahashi

Koichi Nakata

Yuji Miyoshi

Shinji Ikeda

Yoshihiro Sakayanagi

Noriyasu Amano

Daichi Imai

Kazuhisa Mogi

Masato Ikemoto

Takahide Izutani

Koichi Kitaura

Tetsuya Kato

Nao Murase

Keisuke Mizutani

Hideo Yahagi

Mie Sasai

Yoichiro Goya

Masataka Ogushi

Mie Kato

Isamu Nakada

Masaya Suzuki

Michihiro Wakimoto

Shuntaro Yoshida

Yoshinobu Yoshihara

Yasufumi Nakanishi

Yasushi Ono

Youichi Kurebayashi

Hajime Okawa

Takafumi Ogawa

Takaya Suzuki

Yoshihiro Ide

Yasuhiro Koshi

Shinsuke Inagaki

Yohichi Kurebayashi

Ueda Taro

Takahashi Seiji

Kaneko Toyoharu

A SOx concentration acquiring apparatus of an internal combustion engine of the invention acquires sensor currents as SOx concentration currents after a sensor voltage reaches an oxygen decreasing voltage in a reoxidation voltage decreasing control, acquires the sensor current as a base current when the sensor voltage is equal to or lower than the oxygen decreasing voltage in the reoxidation voltage decreasing control, acquires an integration value of differences between the base current and each of the SOx concentration currents, and acquires a SOx concentration of an exhaust gas discharged from an internal combustion engine on the basis of the integration value.

SOx concentration acquiring apparatus of internal combustion engine

When the element temperature of the air-fuel ratio sensor becomes equal to or higher than the activation temperature, the electronic control unit starts the detection of the air-fuel ratio based on the sensor output of the air-fuel ratio sensor and the air-fuel ratio feedback control based on the detection result. The electronic control unit calculates the air-fuel ratio detection value by setting the gain of the air-fuel ratio detection value with respect to the sensor output when the sensor output is a value indicating the air-fuel ratio richer than the stoichiometric air-fuel ratio to a value smaller than that after the elapse of the synchronization period from the start of the air-fuel ratio until the element temperature becomes equal to or higher than the predetermined desorption convergence temperature.

Control device for internal combustion engine

An exhaust gas control apparatus for an internal combustion engine includes: a catalyst which is capable of storing oxygen; a downstream air-fuel ratio sensor that detects the air-fuel ratio of outgoing exhaust gas flowing out of the catalyst; an air-fuel ratio control unit that controls the air-fuel ratio of incoming exhaust gas flowing into the catalyst; and a catalyst state estimation unit that estimates the activity of the catalyst. The air-fuel ratio control unit controls the air-fuel ratio of the incoming exhaust gas so that the air-fuel ratio of the outgoing exhaust gas detected by the downstream air-fuel ratio sensor is maintained at a target air-fuel ratio. The air-fuel ratio control unit sets the target air-fuel ratio to a richer value when the activity of the catalyst is equal to or higher than a predetermined value than when the activity of the catalyst is lower than the predetermined value.

Exhaust gas control apparatus for internal combustion engine and exhaust gas control method for the same

A control device for an internal combustion engine includes an electronic control unit that controls the air-fuel ratio of incoming exhaust gas flowing into a catalyst. The electronic control unit performs oxygen amount variation control in which a target air-fuel ratio for the incoming exhaust gas is switched between a rich set air-fuel ratio and a lean set air-fuel ratio. The electronic control unit switches the target air-fuel ratio to the rich set air-fuel ratio when an air-fuel ratio detected by an air-fuel ratio sensor is equal to or higher than a predetermined oxygen saturation determination air-fuel ratio. The oxygen saturation determination air-fuel ratio is leaner than an oxygen depletion determination air-fuel ratio and richer than the stoichiometric air-fuel ratio.

Control device for internal combustion engine and catalyst abnormality diagnosis method

An exhaust gas control apparatus for an internal combustion engine includes: a catalyst disposed in an exhaust passage of the engine and configured to be able to occlude oxygen; an air-fuel ratio sensor that detects an air-fuel ratio of an out-flow exhaust gas; and an air-fuel ratio control device that controls an air-fuel ratio of an in-flow exhaust gas to a target air-fuel ratio. The device executes air-fuel ratio reduction control in which the target air-fuel ratio is set to a rich setting air-fuel ratio, and corrects a parameter related to the air-fuel ratio reduction control such that an amount of a reducing gas supplied to the catalyst is decreased when a minimum air-fuel ratio obtained when the detected air-fuel ratio is varied to a rich side is richer than the rich setting air-fuel ratio or an average value of detected air-fuel ratios of the in-flow exhaust gas.

Exhaust gas control apparatus and exhaust gas control method for internal combustion engine

A control device selectively executes first and second energization control for controlling an energization amount to the heater. The first energization control is executed to keep temperature of a sensor element within an active temperature region. The first energization control is PWM control in which the energization amount is controlled with closed loop control such that an impedance of the sensor element matches a target value. The second energization control is PWM control in which the energization amount is controlled with open loop control so as to keep the temperature of the sensor element within a preset temperature region that is lower than the active temperature region. The control device executes the second energization control during an internal combustion engine is stopped while executing the first energization control during the internal combustion engine is not stopped.

Control system of air-fuel ratio sensor

An abnormality detection device for an air-fuel ratio detection device arranged downstream of a filter is equipped with an abnormality detection unit that detects an abnormality in the air-fuel ratio detection device based on output change characteristics of the air-fuel ratio detection device during fuel cutoff control for stopping the supply of fuel to a combustion chamber of an internal combustion engine, and a combustion determination unit that determines whether or not a combustion amount of particulate matter in a filter during fuel cutoff control is larger than a predetermined amount. The abnormality detection unit prohibits detection of an abnormality in the air-fuel ratio detection device when the combustion determination unit determines that the combustion amount is larger than the predetermined amount.

Abnormality detection device for air-fuel ratio detection device

The abnormality diagnosis systemof a downstream side air-fuel ratio detection device, comprises an air-fuel ratio control partcontrolling an air-fuel ratio of an air-fuel mixture, an abnormality judgment partjudging abnormality of the downstream side air-fuel ratio detection device based on a characteristic of change of output of the downstream side air-fuel ratio detection device when the air-fuel ratio control part makes the air-fuel ratio of the air-fuel mixture change, and an oxygen change calculation partcalculating an amount of change of an oxygen storage amount of the catalyst when the air-fuel ratio control part makes the air-fuel ratio of the air-fuel mixture change. The abnormality judgment part does not judge abnormality of the downstream side air-fuel ratio detection device when the amount of change of the oxygen storage amount is less than a lower limit threshold value.

Abnormality diagnosis system of downstream side air-fuel ratio detection device

A control device for an exhaust sensor is configured to control the exhaust sensor disposed in an exhaust passage of an internal combustion engine. The control device for an exhaust sensor includes: a sensor element; a heater configured to heat the sensor element; a current detection circuit configured to detect an output current of the exhaust sensor, and an electronic control device configured to control electric power that is supplied to the heater by PWM control.

Control device for exhaust sensor

A control system of an internal combustion engine comprises an air-fuel ratio sensordetecting an air-fuel ratio of exhaust gas, a current detecting devicedetecting an output current of the air-fuel ratio sensor, a voltage applying deviceapplying voltage to the air-fuel ratio sensor, and a voltage control partconfigured to control voltage applied to the air-fuel ratio sensor through the voltage applying device. The voltage control part is configured to set the applied voltage to a reference voltage determined so that the output current becomes zero when an air-fuel ratio of inflowing exhaust gas flowing into the air-fuel ratio sensor is a stoichiometric air-fuel ratio, and correct the reference voltage so that the output current detected by the current detecting device becomes zero when it is judged that the air-fuel ratio of the inflowing exhaust gas is the stoichiometric air-fuel ratio.

Control system of internal combustion engine

A sensor system for an engine for which an automatic stop-restart control is performed, the sensor system including: an exhaust gas sensor including a heater that heats a sensor element; and a control unit configured to: while the engine is stopped by the automatic stop-restart control, execute a preheat control of adjusting a temperature of the sensor element to a preheat temperature lower than an activation temperature; when an automatic start condition is satisfied, stop the preheat control and increase the temperature of the sensor element to the activation temperature; when an automatic stop condition is satisfied and a delay condition has not been satisfied, set the preheat temperature to a first temperature; and when the automatic stop condition is satisfied and the delay condition has been satisfied, set the preheat temperature to a second temperature higher than the first temperature.

Sensor system

A control apparatus for an internal combustion engine includes an exhaust gas sensor that has a sensor element and a heater for electrically heating the sensor element, a sensor circuit that detects the electric current generated by the exhaust gas sensor, a controller configured to: carry out starting processing to start the internal combustion engine, learn a value of the output of the sensor circuit when the starting processing is carried out by the controller, and control a temperature of the sensor element by using the heater, and controls the temperature of the sensor element to less than the predetermined temperature until the learning of the output value of the sensor circuit by the controller is completed after the starting processing is carried out by the controller.

Control apparatus for an internal combustion engine

A catalyst deterioration detection systemcomprises an air-fuel ratio sensor, a current detection device, a voltage application device, a voltage control part, an air-fuel ratio control partand a deterioration judging part. The air-fuel ratio control part executes fuel cut control, and, after the fuel cut control, executes rich control. The voltage control part, if judging that the air-fuel ratio of the outflowing exhaust gas has reached the stoichiometric air-fuel ratio when setting the applied voltage to a first voltage in a limit current region during the rich control, changes the applied voltage from the first voltage to a second voltage in a limit current region. The deterioration judging part judges the degree of deterioration of the catalyst based on the output current of the air-fuel ratio sensor when the applied voltage is set to the second voltage.

Catalyst deterioration detection system

An air-fuel ratio detection device' comprises: a sensor element&#x2032; including a sensor cell; a voltage application circuit&#x2032; applying voltage to the sensor cell; a current detector&#x2032; detecting an output current of the sensor cell; an air-fuel ratio calculating partconfigured to calculate an air-fuel ratio of an exhaust gas; and a parameter detecting partconfigured to detect or calculate a temperature correlation parameter correlated with a temperature of the sensor element. The air-fuel ratio calculating part is configured to calculate the air-fuel ratio of the exhaust gas based on the temperature correlation parameter and the output current detected when a predetermined voltage is applied to the sensor cell.

Air-fuel ratio detection device and air-fuel ratio detection method

Rich spike is carried out in an efficient manner. In an exhaust gas purification apparatus for an internal combustion engine which performs lean burn operation, the apparatus includes an NOx storage reduction catalyst, a controller to carry out rich spike, to calculate a storage amount of NOx, to calculate a storage amount of nitrates, and calculate a nitrate ratio, wherein the controller controls a timing at which the rich spike is carried out, based on the nitrate ratio.

Exhaust gas purification apparatus for an internal combustion engine

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Shizuoka-ken, Japan

Keiichiro Aoki