Patent ID: 7141090

Claim:
An emissions sampling system comprising: an exhaust gas probe for sampling exhaust gas; a dilution gas source for providing dilution gas; a mixing device in fluid communication with said exhaust gas probe and said dilution gas source for mixing a sampled exhaust gas and the dilution gas to form a diluted exhaust gas; a particulate filter in fluid communication with said mixing device; a dilution temperature conditioning device arranged between said dilution gas source and said mixing device for obtaining a desired dilution gas temperature; a temperature sensor producing a temperature signal corresponding to a temperature of a fluid flowing through said sampling system; and a controller communicating with said temperature sensor and processing said temperature signal to determine a filter temperature from said temperature signal, said controller commanding said conditioning device in response to said filter temperature and a signal indicative of a mass of at least one of the sampled exhaust gas, the dilution and the diluted exhaust gas.