Toyota Jidosha Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Tokio Okano

Yoshihiro Deguchi

Katsutoshi Goto

Masahiro Yamakage

Tomoyasu Iwase

Masao Watanabe

Minoru Danno

Masazumi Tanoura

Norihiro Fukuda

Satoshi Fukada

Masanobu Mizoguchi

Atushi Takita

An exhaust gas analysis method comprises applying a laser beam to the exhaust gas discharged from an internal combustion engine, receiving the laser beam that has passed through the exhaust gas, and measuring the concentration of any of the components contained in the exhaust gas based on the received laser beam. The exhaust gas analysis method further comprises detecting the absorption spectrum of the laser beam absorbed in the exhaust gas by using the received laser beam, calculating the concentration of the specific gas component by using the absorption spectrum, calculating the temperature of the exhaust gas by using the absorption spectrum, calculating the pressure of the exhaust gas by using the absorption spectrum, correcting the calculated concentration of the component contained in the exhaust gas by using the calculated temperature, correcting the concentration by using the calculated pressure, and outputting the true concentration value.

Exhaust gas analysis method and exhaust gas analysis apparatus

An exhaust gas analyzer of the present invention includes a sensor unitinstalled in an exhaust path from an engine, applies laser light to exhaust gas emitted from the engine and receives laser light that has passed through the exhaust gas so as to measure the concentration of a component contained in the gas based on the received laser light. To an apertureformed in a sensor baseof the sensor unit, an adjustment ringin a circumferential face of which small holesserving as a laser light passage portion is formed and whose inner circumferential face serves as an exhaust gas passage openingis detachably fitted, whereby the sensor unit can be attached so as to conform to different inner diameters of exhaust tubes.

Sensor unit in exhaust gas analyzer

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Toyota, Japan

Tokio Okano