Toyota Jidosha Kabushiki Kaisha

Horiba, Ltd.

Kimikazu Yoda

Kazuhiro Wakao

Keisuke Sano

Takaaki Itou

Go Hayashita

Keiichiro Aoki

Hiroshi Sawada

Taiga Hagimoto

Daisuke Shibata

Hideki Ohashi

Takaaki Kanazawa

Hitoshi Hirai

Kenichi Uchida

Toshio Mizutaka

Hiroaki Katumata

The abnormality diagnosis system&#x2033; of an ammonia detection devicecomprises: an air-fuel ratio detection devicearranged in the exhaust passageat the downstream side of the catalyst; an air-fuel ratio control partconfigured to control an air-fuel ratio of exhaust gas; and an abnormality judgment partconfigured to judge abnormality of the ammonia detection device. The air-fuel ratio control part performs rich control making the air-fuel ratio of the inflowing exhaust gas richer than a stoichiometric air-fuel ratio. The abnormality judgment part judges that the ammonia detection device is abnormal if, after start of the rich control, an output value of the ammonia detection device does not rise to a reference value before the air-fuel ratio detected by the air-fuel ratio detection device falls to a rich judged air-fuel ratio richer than a stoichiometric air-fuel ratio.

Abnormality diagnosis system of ammonia detection device

An exhaust purification system comprises an exhaust purification catalyst, an NOsensor, air-fuel ratio sensordownstream of the catalyst, and a control and diagnosis device. The device alternately sets a target air-fuel ratio to a rich air-fuel ratio and a lean air-fuel ratio and switches the target air-fuel ratio from the rich air-fuel ratio to the lean air-fuel ratio when the output air-fuel ratio of the air-fuel ratio sensor becomes a rich judged air-fuel ratio or less. The device diagnoses abnormality of the catalyst based on the output of the NOsensor. It diagnoses abnormality of the catalyst when the air-fuel ratio of the exhaust gas flowing into the catalyst is a rich air-fuel ratio, but does not diagnose abnormality of the catalyst when the air-fuel ratio of the exhaust gas flowing into the catalyst is a lean air-fuel ratio.

Exhaust purification system of internal combustion engine

The exhaust purification system of an internal combustion engine comprises: a catalyst arranged in an exhaust passage of the internal combustion engine and able to store oxygen; an ammonia detection device arranged in the exhaust passage at a downstream side of the catalyst in a direction of flow of exhaust; and an air-fuel ratio control part configured to control an air-fuel ratio of inflowing exhaust gas flowing into the catalyst to a target air-fuel ratio. The air-fuel ratio control part is configured to perform rich control making the target air-fuel ratio richer than a stoichiometric air-fuel ratio, and make the target air-fuel ratio leaner than the stoichiometric air-fuel ratio when an output value of the ammonia detection device rises to a reference value in the rich control.

An exhaust emission control system of an internal combustion engine includes: a bypass passage () provided in an exhaust passage () of the engine and arranged to bypass a main passage () as a part of the exhaust passage, a NOx adsorbent () provided in the bypass passage and adapted to adsorb at least NOx as one of components contained in exhaust gas, a channel switching device () that switches a channel of the exhaust gas between the main passage and the bypass passage, an adsorption control device () that controls the channel switching device, based on operating conditions of the engine, so as to cause the exhaust gas to flow through the bypass passage, and an adsorbing capability determining device () that determines, when the adsorbing capability of the NOx adsorbent degrades, whether the degradation in the adsorbing capability is a surmountable degradation from which the NOx adsorbent can recover, or an insurmountable degradation from which the NOx adsorbent cannot recover.

Exhaust emission control system of internal combustion engine

An exhaust gas purification device has: a bypass passage () disposed in an exhaust passage () of an internal combustion engine (); an adsorbent () which is disposed in the bypass passage (), and adsorbs unburned components in exhaust gas at a low temperature and desorbs the adsorbed unburned components at a high temperature; and an exhaust gas purification catalyst () which is disposed in the exhaust passage () at a downstream side of a portion where the bypass passage () merges, and purifies unburned components in exhaust gas; and a desorption amount adjustment () unit that adjusts the desorption amount of unburned components adsorbed by the adsorbent () based on an integrated fuel cut air amount (fgs), which is an integrated value of air amount taken into a combustion chamber of the internal combustion engine () during execution of fuel cut.

Exhaust gas purification device and exhaust gas purification method

An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can properly purge at least NOx of unpurified components contained in exhaust gas while considering characteristics of NOx desorbed from an adsorbent. A bypass passagebypassing a main exhaust passageof the internal combustion engineis provided. A HC/NOx adsorbenthaving a function of adsorbing HC and NOx is provided in the bypass passage. A second underfloor catalystis provided downstream of the adsorbent. A purge passagebranching off from the bypass passagewhile connecting to an intake passage is provided. An exhaust switching valveand a purge control valveare provided as a flow path switching means that is capable of switching a flow target into which the exhaust gas flows between the main exhaust passageand the bypass passage. If the purging operations are executed, the intake purging operation is first executed. After that, the intake purging operation is switched to the exhaust purging operation at a timing existing after the purge of NOx is completed and at the time point at which the temperature of the adsorbent becomes stable.

Exhaust gas purifying apparatus for internal combustion engine

A moisture adsorbent () for adsorbing moisture in exhaust gas and an NOx adsorbent () for adsorbing NOx are disposed in a bypass passage () for bypassing an exhaust passage () of an internal combustion engine (). When an adsorption operation to the NOx adsorbent () is executed, inflow of the exhaust gas to the bypass passage () is allowed until the moisture amount that flows into the water adsorbent () reaches an allowable moisture inflow amount. The allowable moisture inflow amount is determined based on a residual moisture amount before the starting of the adsorption operation in the moisture adsorbent (). The residual moisture amount in the water adsorbent () can be determined based on the temperature of the moisture adsorbent () at the immediately preceding execution of the purge operation.

Exhaust gas purification device and exhaust gas purification method for internal combustion engine

An exhaust gas purifying apparatus for an internal combustion engine is provided to desorb predetermined components contained in exhaust gas from an adsorption device for adsorbing the components and to purify the desorbed components, even during the stop of the internal combustion engine. A main exhaust passage and a bypass passage bypassing the main exhaust passage are provided. An exhaust switching valve is capable of switching a flow target into the exhaust gas flows between the main exhaust passage and the bypass passage. An adsorbent for adsorbing the predetermined components is provided in the bypass passage. An underfloor catalyst including a catalyst with a heater is provided at a downstream side of the bypass passage in the main exhaust passage. A pump and a heater are provided in an air supply passage which branches from the bypass passage at an upstream portion of the adsorbent.

A main exhaust passageand a first bypass passagebypassing the main exhaust passageare provided. An absorbenthaving a function of absorbing HC components and NOx components contained in exhaust gas is provided in the first bypass passage. An underfloor catalystincluding a catalyst with an electric heater (EHC)is provided in a main exhaust passageon a downstream side of a downstream connecting portionin a first bypass passage. A second bypass passagethat provides communication between the main exhaust passagedownstream of the underfloor catalystand the first bypass passageupstream of the absorbentis provided. A first exhaust switching valveis provided in an upstream connecting portion, and a second exhaust switching valveis provided in a main exhaust passage side connecting portion. A pumpis provided in the middle of the second bypass passage

A moisture adsorbing devicecomprising a type Y zeolite, and an NOadsorbing devicebeing put in place on an exhaust-gas downstream side of the moisture adsorbing device, and comprising a zeolite that includes a transition metal ion in the cation exchange sites are included. In NOadsorbing apparatuses, since the less the moisture content in exhaust gases is the more the NOadsorbing capability improves, the NO adsorbing capability in low-temperature region is improved especially by means of the combination with a moisture adsorbing device that comprises a type Y zeolite whose AlOproportion is great and whose moisture adsorbing amount is great compared with the other zeolites.

Exhaust-gas converting apparatus

The present invention relates to an exhaust emission control device having an NOx adsorbent, and makes it possible to judge whether the performance of the NOx adsorbent is degraded temporarily or permanently. The amounts of NOx and water adsorbed by the NOx adsorbent are measured during an actual operation of an internal combustion engine. A reference line indicating the correlation between a preselected water adsorption amount and NOx adsorption amount is then referenced to determine a reference value y0 of the NOx adsorption amount that corresponds to a measured value x1 of the water adsorption amount. Next, a measured value y1 of the NOx adsorption amount is compared against the reference value y0 to output a signal in which the result of the comparison is reflected.

Exhaust emission control device for internal combustion engine and performance diagnosis method for NOx adsorbent

In a malfunction diagnosis device for an exhaust gas purification system including an exhaust gas purification catalyst disposed in the exhaust passage of an internal combustion engine, and a reductant supply device that supplies reductant to exhaust gas that flows in an upstream side of the exhaust gas purification catalyst, the degree of degradation of the exhaust gas purification catalyst is diagnosed by comparing the timing at which the bed temperature of the exhaust gas purification catalyst starts to rise due to the heat of moisture adsorption reaction, against a normal value.

Malfunction diagnosis device for exhaust gas purification system and malfunction diagnosis method therefor

A gas sampling bag is capable of blowing out the gas uniformly into the bag main body, and filling the bag main body with gas in a securely mixed state. A gas sampling bag that is connected to a constant volume sampling passage, contains a pipe, on which a plurality of gas inlet/outlet holes are formed, in a bag main body, and allows the gas to flow into/out of the bag main body through the gas inlet/outlet holes. The opening of the plurality of gas inlet/outlet holes is formed in such a manner that the size is minimized while the pressure loss is suppressed so as not to increase as far as possible.

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Susono, Japan

Kimikazu Yoda