[Abstract]

While recognition of the importance of environmental problems is increasing, environmental impact caused particularly by engine emissions is attracting public attention. Emission regulations themselves are getting tighter than ever, but not only that, the global trend is to demand even further advances beyond merely meeting regulation requirements. Surveying of vehicle emissions in a ¡Æreal world¡Ç condition is discussed here as an example. At HORIBA, the on-board emission measurement system OBS-1000 series was released for this purpose. The OBS-1000 series consists of gas analyzers, flow meter, various sensors, and data logger. Measuring and recording of the concentration of CO, CO2 , HC, and NOx in real world conditions, air-fuel ratio, calculation of mass emission of each component and fuel consumption, etc., are possible. In this paper, the outline of this system is described.