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A sensitive laser mass spectrometer is being developed for fast multicomponent engine exhaust analyses. The features of the system meet the requirements of the analysis problems at dynamic motor test stands: detection of all organic and inorganic exhaust constituents of concentrations higher than 1 ppm simultaneous detection of up to 12 selectable exhaust compounds with 100 Hz repetition rate 2 millisecond time precision relative to the motor phase. precise sampling location everywhere in the exhaust pipe system, e.g. single valve or cylinder exhaust gas analysis ruggedness for operation at engine test facilities The time and space resolution allows the tracking of the different exhaust components during one and more motor cycle in static and transient engine operations. This information is essential for an understanding of the combustion processes, which is necessary for the development of the engine and engine control and other efforts to reduce emission of pollutants.

A sensitive laser mass spectrometer has been developed for fast multicomponent automotive exhaust analyses. The system is particularly appropriate for working at dynamic motor test stands and provides the following features: Detection of all individual organic and inorganic exhaust constituents with 1 ppm sensitivity Simultaneous detection of up to 12 selectable exhaust compounds with a measurement rate of up to 100 Hz 2 ms time precision relative to the motor phase - Ruggedness for operation at engine test facilities This system has been used at a motor test facility to investigate the emissions of aromatic hydrocarbons benzene, toluene, xylene, and of nitrogen oxide in stationary and dynamic engine operation. These measurements demonstrate some of the capabilities of the analysis system to obtain fundamental information about the combustion processes and about processes in the exhaust pipe.