This paper presents a method to estimate instantaneous diesel engine emissions during transients using analytical means usually adopted for steady state investigations. The initial emphasis is on the inability of the conventional analysis systems to directly provide instantaneous levels of gaseous emissions during transients. In the ensuing section, a signal reconstruction technique used to rebuild instantaneous pollutant emissions at the engine exhaust is described. This reconstruction is based on a transfer function, which is the ratio of known measured and applied pollution signals. As a validation of this technique, the inversion of the transfer function is then applied to measurements obtained during basic tests consisting of steps and ramps. Finally, a method for estimating diesel particulates during transients through a correlation established from the measurements of carbon monoxide and smoke opacity is presented.

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