Patent ID: 7574307
Filing Date: 2009-08-11
Classification: G01F,G01M,G01N,G05D,Y10T

Abstract:
1. An exhaust emissions analysis system comprising: an exhaust and dilution gas source respectively providing exhaust and dilution gases; a diluter unit mixing said exhaust and dilution gases thereby providing a diluted exhaust gas initially having an uncorrected dilution ratio; a humidity measurement device measuring water content of one of said exhaust and said diluted exhaust gases and producing a water content signal corresponding to said water content; a bag collecting said diluted exhaust gas; a metering device regulating a flow of diluted exhaust gas into said bag; and a control device receiving said water content signal and calculating an adjustment factor relating to said water content, said control device sending a flow rate command signal corresponding to said adjustment factor to a flow correction device other than said metering device to ensure that the contents of said bag represent diluted exhaust gas having a corrected dilution ratio, said flow correction device providing a corrected flow rate of at least one of the exhaust and dilution gases to said diluting unit in response to the flow rate command signal to provide the corrected dilution ratio at said diluter unit.