Exhaust gas particulate measuring system
First Claim
1. 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 includes a constant mass flow stream and a variable mass flow stream non-collinearly connected with said constant mass flow stream prior to the inlet of the partial flow dilution tunnel for controlling a dilution air supply to said partial flow dilution tunnel.
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Abstract
A gas sampling system 36 capable of testing and certifying internal combustion engines 16 under transient conditions is provided and includes a partial flow dilution tunnel 38, master and slave mass flow controllers 80,60 and a transient dilution air flow controlling arrangement 110. The transient dilution air flow controlling arrangement 110 measures the transient changes in intake air and varies the flow of diluent air to the partial flow dilution tunnel 38. By controlling the diluent air in this manner ensures that a particle sample can be taken at any time that is at a constant proportion to the exhaust flow rate.
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Citations
37 Claims
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1. A gas sampling system for measuring particulate matter in an exhaust gas stream of an internal combustion engine comprising:
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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 includes a constant mass flow stream and a variable mass flow stream non-collinearly connected with said constant mass flow stream prior to the inlet of the partial flow dilution tunnel for controlling a dilution air supply to said partial flow dilution tunnel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A gas sampling system for measuring particulate matter in an exhaust gas stream of an internal combustion engine comprising:
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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 means for controlling dilution air to said partial flow dilution tunnel, said means being interposed the first mass flow controller and the inlet of said partial flow dilution tunnel, said means includes a constant mass flow stream and a variable mass flow stream non-collinearly connected with said constant mass flow stream prior to the inlet of the partial flow dilution tunnel. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification