Patent ID: 7021130

Claim:
A method for measurement of exhaust gas from internal combustion engines using a full-flow dilution method and subjecting an internal combustion to at least one of a plurality of specified test cycles, comprising: varying an exhaust flow of the internal combustion engine during said at least one test cycle; mixing the exhaust flow of said internal combustion with dilution air so that, in said at least one test cycle, a defined total flow results; extracting a partial sampling flow from said total flow during said test cycle, said partial sampling flow being used for measuring emission values of the exhaust gas, wherein a smoothed curve of the varied exhaust flow is determined such that the gradients of the smoothing applied during formation of the smoothed curve of the exhaust flow are limited to maximum values and wherein said maximum values are determined from possible gradients in the control dynamic which can be afforded by devices used for drawing the total flow and partial sampling flow, respectively, and the total flow is subjected to a proportional control in respect of variations in the obtained smoothed curve of the exhaust flow.