Application of a Magnetic Sector type Hydrogen Analyzer For Engine Emission Measurement 2001-01-0210
A new hydrogen analyzer using a magnetic sector mass spectrometer (MS) has been developed to perform continuous analysis of hydrogen gas concentrations in exhaust gas. This method is insensitive to substances other than hydrogen gas ions and so is not easily affected by the presence of other molecules. In addition, this analyzer has a fast response compared to conventional hydrogen analyzers, which employ other measurement principles. The T90 response time is about 1 second. The minimum sensitivity is few tens of ppm. Because of these characteristics, the sector MS method has significant potential for analyzing hydrogen concentrations in exhaust gas continuously.
In this study, the authors performed continuous emissions measurement of several kinds of gasoline engine vehicle in a chassis test cell using the hydrogen gas analyzer in combination with other gas analyzers. Transient measurement of hydrogen offers beneficial information that may be used to improve a combustion system and reduce harmful exhaust compounds. The results of the vehicle emissions testing, the technique of the measurements, and the capability of the application for an engine measurement system are also described in detail.