1999-01-13

ECE R83 Chassis Dynamometer Transient Test Emission Predictions from ECE R49 Steady-State Emission Test Results 990032

It is easier and more economical to conduct R49 13-mode cycle emission tests in engine test bed compared to chassis dynamometer ECE R83 test. This is because of costlier test equipment for chassis dynamometer and requirement of separate dynamometers for various categories of vehicles, even when connected with the same engine. Two methods have been attempted for predicting ECE R 83 cycle emissions from R49 test results based on the extensive emission trials conducted in both engine and chassis dynamometers. The first method is by using the modified weightage factors applied to each mode results of R49 test. While the second method uses the mapped ECE R 83 load/speed points for a particular configuration of vehicle and translating them to nearest load/speed point of R49 cycle. The predicted emission values conform well to the actual chassis dynamometer results. The variations of the gaseous emissions of CO and HC+NOx, are within ±10%, although the deviations for PM emission are slightly higher.

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