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Method and system for vehicle emission testing

  • US 7,071,002 B1
  • Filed: 09/05/2003
  • Issued: 07/04/2006
  • Est. Priority Date: 05/09/2000
  • Status: Expired due to Fees
First Claim
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1. A method for determining a mass of a pollutant in an emissions sample obtained from a particular vehicle, comprising the steps of:

  • extracting the emissions sample from the particular vehicle as it is operated over a testing period comprised of one or more discrete time intervals;

    determining instantaneous fuel consumption of the particular vehicle;

    calculating an exhaust flow rate based on the instantaneous fuel consumption of the particular vehicle at each discrete time interval;

    analyzing the emissions sample extracted from the particular vehicle to measure the concentration of the pollutant in said sample at each discrete time interval; and

    determining the mass of the pollutant at each discrete time interval by multiplying the exhaust flow rate by the measured concentration of the pollutant by a known density of the pollutant.

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