Toyota Jidosha Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Katsutoshi Goto

Yoshihiro Deguchi

Masahiro Yamakage

Kenji Muta

Tomoyasu Iwase

Tokio Okano

Satoshi Fukada

Masao Watanabe

Minoru Danno

Masazumi Tanoura

Akio Kondou

Shinichiro Asami

Taketoshi Yamaura

Norihiro Fukuda

Masanobu Mizoguchi

Atushi Takita

An exhaust gas analyzer capable of real-time analysis of the concentration, temperature, and the like of an exhaust gas component in a cross-section of an exhaust path in a spot-wise manner reduces analysis cost. An exhaust gas analyzer () comprises sensor units () to () disposed along the exhaust path, which comprises an exhaust manifold () for the engine () discharging exhaust gas, an exhaust tube (), a first catalyst device (), a second catalyst device (), a muffler (), and an exhaust pipe (). Each sensor unit includes an optical fiber () for irradiating the exhaust gas with laser light, and a detector () for receiving the laser light emitted by the optical fiber that has been transmitted through the exhaust gas. Based on the laser light received by the detector, the condition of an exhaust gas component, such as its concentration, temperature, and the like, is measured for the analysis of the exhaust gas. The sensor unit has a through-hole () allowing the passage of exhaust gas that is formed in a shape matched with a cross-sectional shape of the exhaust path. The infrared laser light R is emitted via the optical fiber () into the through-hole (), travels across the exhaust path, and is then received by the detector ().

Exhaust gas analyzer

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

A gas analyzer capable of measuring a concentration of a gas component in gas at sensor units provided at a plurality of positions in real time by decreasing the number of signals input from the sensor units to an analyzer so as to reduce a data amount input to the analyzer and a gas analyzing method. The gas analyzing method includes the steps of: demultiplexing laser light by a demultiplexer into measurement laser light and reference laser light; letting the measurement laser light pass through gas to be received by a photoreceiver; finding an absorption spectrum absorbed by a gas component in the gas based on a light intensity of the received measurement laser light and of the reference laser light; and analyzing the absorption spectrum to measure a concentration of the gas component.

Gas analyzer and gas analyzing method

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

An exhaust gas analyzer and an exhaust gas analyzing method capable of analyzing the concentration of particulate matter contained in exhaust gas from an internal combustion in real time are provided. The exhaust gas analyzer includes: an exhaust gas passage holethrough which the exhaust gas from the internal combustion is introduced; an optical fiberthat applies the laser light in a direction perpendicular to a flow of the exhaust gas flowing through the exhaust gas passage hole; a detectorthat receives the laser light that has passed through the exhaust gas; a photodetectorthat receives Mie scattered light generated from particulate matter PM contained in the exhaust gas by irradiating the particulate matter with the laser light; and a personal computeras a calculation unit that calculates a concentration of a component in the exhaust gas based on photoreceiving data of a transmitted light intensity obtained from the detector, and calculates a concentration of the particulate matter contained in the exhaust gas based on actual measurement data of a scattered light intensity obtained by the photodetector

Exhaust gas analyzer and exhaust gas analyzing method

Growing community of inventors

Okazaki, Japan

Katsutoshi Goto