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Exhaust gas particulate measuring system

  • US 20040118223A1
  • Filed: 10/24/2003
  • Published: 06/24/2004
  • Est. Priority Date: 07/10/2001
  • Status: Active Grant
First Claim
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14. (New) A gas sampling system for measuring particulate matter in an exhaust gas stream of an internal combustion engine comprising:

  • a partial flow dilution tunnel connected to the exhaust gas stream of the engine;

    a first mass flow controller operatively connected an inlet of said partial flow dilution tunnel;

    a second mass flow controller connected to an outlet end of said partial flow dilution tunnel;

    a filter interposed said second mass flow controller and the outlet end of said partial flow dilution tunnel; and

    a transient dilution air control arrangement being interposed the first mass flow controller and the inlet of said partial flow dilution tunnel, said transient dilution air control arrangement controlling a dilution air supply to said partial flow dilution tunnel.

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