Method and apparatus for vehicle exhaust gas pollutant mass flow

Details Method and apparatus for vehicle exhaust gas pollutant mass flow Method and apparatus for vehicle exhaust gas pollutant mass flow

1998-04-10

2000-09-05

McCall, Eric S.

Measuring and testing

Gas analysis

Gas of combustion

731181, G01M 1500

Patent

active

06112575&

ABSTRACT:
A method and apparatus to provide a very compact and low power measurement of vehicular (automobile) exhaust emissions with results similar to those obtained with traditional CVS dynamometer lab emissions equipment. The sample dilution necessary for the analysis is performed by a computer controlled PWM valve as a function of measure exhaust mass flow, with the result that a "mini CVS" is accurately performed on a small fraction of the total exhaust flow.

REFERENCES:
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patent: 5129257 (1992-07-01), Carduner et al.
patent: 5628296 (1997-05-01), Herrington et al.
patent: 5709082 (1998-01-01), Harris et al.
patent: 5739413 (1998-04-01), Kohn et al.
patent: 5756360 (1998-05-01), Harvey et al.

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