Toyota Jidosha Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Aisan Kogyo Kabushiki Kaisha

Yoyota Jidosha Kogyo Kabushiki Kaisha

Takatoshi Masui

Toshiyasu Katsuno

Toshinari Nagai

Toshio Tanahashi

Nobuaki Kayanuma

Yoshiki Chujo

Yasushi Sato

Hironori Bessho

Yasushi Satou

Makoto Suzuki

Masaki Mituyasu

Mamoru Yoshioka

Takashi Shimazu

Satoshi Iguchi

Hiroshi Aoki

Tokuta Inoue

Masaki Mitsuyasu

Satoshi Aoyama

Shigetaka Takada

Hiroyuki Mitsui

Shigeru Ogino

Kingo Horii

Yasuhiro Izawa

Toshiyuki Takimoto

Kohichi Hasegawa

Masayuki Okamura

Makoto Hotta

In a fuel cell system that includes a reformer adapted to reform a feedstock, and a fuel cell that uses fuel gas contained in the reformed gas produced by this reformer to generate electricity, aims to improve generation efficiency in the fuel cell through a relatively simple feature. The fuel cell system includes a feedstock supplying section such as a pressurizing pump for supplying the feedstock to the reformer; a burner adapted to combust the fuel gas that was not consumed by electricity generation in the fuel cell, and heat the reformer; a temperature sensor for sensing the temperature of the burner; and a control unit adapted to control on the basis of the sensed temperature the feed rate of the feedstock supplied from the feedstock supplying section to the reformer, so as to maintain the temperature of the reformer within a prescribed temperature range optimized for reforming the feedstock.

Fuel cell system and method of controlling a fuel cell system

A fuel cell system including a fuel cell, a reformer, a combustor that heats the reformer using anode off-gas of the fuel cell as a fuel, and a ratio controller that controls a ratio of a combustion component supplied to the combustor in accordance with a temperature distribution in a gas flow direction inside the combustor.

Fuel cell system

In a hydrogen generation device according to the invention, PSR reformers have a heat capacity smaller than that of the other PSR reformers. Therefore, the temperature of the catalyst reaches to a reforming-start temperature more quickly in the PSR reformers than in the other PSR reformers. When the hydrogen generation device is started and the reforming reaction is carried out, the mixture of gasoline vapor and water vapor is selectively and preferentially supplied to the PSR reformers so that the reforming reaction is carried out in the PSR reformers.

Hydrogen generation device and fuel cell system including same

A hybrid system includes an electrical motor generating motive power, a storing portion providing electrical power to the electrical motor, a fuel cell that provides electrical power to the electrical motor or the storing portion within a predetermined output range, an internal combustion engine absorbing loading of the fuel cell, a determination portion that determines whether the loading of the fuel cell is above the maximum output in the predetermined range, and a control portion that controls the internal combustion engine so as to operate if it is determined that the loading of the fuel cell is above the maximum output in the predetermined range.

Hybrid system

A power system of the invention includes fuel cells and a fuel gas generation system that generates a fuel gas to be supplied to the fuel cells. At the time of stopping supply of hydrogen, the fuel gas generation system selectively uses a stop process that replaces hydrogen in a hydrogen separator unit with the air for removal of hydrogen and a pause process that allows hydrogen to remain in the hydrogen separator unit. The stop process is selected when the fuel gas generation system stops the supply of hydrogen for a long time period. The pause process is selected when the fuel gas generation system temporarily stops the supply of hydrogen. The arrangement of the invention desirably shortens a restart time of the fuel gas generation system and reduces a potential energy loss.

Drive control of power system including fuel cells

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors including an air-fuel ratio correction amount. Also, a learning correction amount is calculated so that a mean value of the air-fuel ratio correction amount is brought close to a reference value. The actual air-fuel ratio is further adjusted in accordance with the learning correction amount.

Double air-fuel ratio sensor system carrying out learning control

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors. Also, when the output of the upstream-side air-fuel ratio sensor is in an abnormal state, an alarm is generated.

Double air-fuel ratio sensor system having improved exhaust emission

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an air-fuel ratio correction amount is calculated in accordance with the outputs of the upstream-side and downstrean-side air-fuel ratio sensors, thereby obtaining an actual air-fuel ratio. When a time period of reversions of the output of the downstreamn-side air-fuel ratio sensor is larger than a predetermined value, the calculation of the air-fuel ratio correction amount by the output of the downstream-side air-fuel ratio sensor is prohibited.

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors including an air-fuel ratio correction amount. Also, a learning correction amount is calculated so that an integration amount of the air-fuel ratio correction amount is brought close to a reference value. The actual air-fuel ratio is further adjusted in accordance with the learning correction amount.

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors. A center value of an air-fuel ratio correction amount or an air-fuel ratio feedback control parameter calculated based upon the output of the downstream-side air-fuel ratio sensor is calculated by a learning control, and an air-fuel ratio feedback control is initiated by using the center value when the engine enters into an air-fuel ratio feedback control state.

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side air-fuel ratio sensor and the downstream-side air-fuel ratio sensor. The adjustment of the air-fuel ratio by the downstream-side air-fuel ratio sensor is stopped when the engine is in a predetermined state.

Double air-fuel ratio sensor system having improved response

In a double air-fuel ratio sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust passage, the actual air-fuel ratio is adjusted in accordance with an air-fuel ratio correction amount calculated by using the output of the upstream-side air-fuel ratio sensor and an air-fuel ratio feedback control parameter such as delay time periods, skip amounts, or integration amounts calculated by using the output of the downstream-side air-fuel ratio sensor, and the calculation of the air-fuel ratio feedback control parameter is prohibited when the downstream-side air-fuel ratio sensor is in an abnormal state.

Double air-fuel ratio sensor system in internal combustion engine

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, a delay operation is performed upon the output of the downstream-side air-fuel ratio sensor, so that the actual air-fuel ratio is adjusted in accordance with the output of the upstream-side air-fuel ratio sensor and the delayed output of the downstream-side air-fuel ratio sensor.

In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is adjusted in accordance with the outputs of the upstream-side and downstream-side air-fuel ratio sensors including an air-fuel ratio correction amount. Accordingly, only when the change of the intake air density is large, is a learning correction amount calculated so that a means value of the air-fuel ratio correction amount is brought close to a reference value. The actual air-fuel ratio is further adjusted in accordance with the learning correction amount.

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Mishima, Japan

Takatoshi Masui