Technical Paper
Simulation of Low Level Vehicle Exhaust Emissions for Evaluation of Sampling and Analytical Systems
2001-03-05
2001-01-0211
The Vehicle Exhaust Simulator is a tool developed to evaluate the performance of vehicle emissions sampling and analytical systems. Simulating a vehicle's emissions with accurate and repeatable equipment, rather than using a vehicle to produce emissions, eliminates several sources of variability (e.g. driver, dynamometer, vehicle) and isolates the performance of the sampling and analytical systems. Use of the Vehicle Exhaust Simulator includes: diagnosing test site problems, tracking performance over time, establishing correlation between emissions sites, and acceptance testing of new emissions sampling and analytical equipment. The Vehicle Exhaust Simulator was developed to emulate emissions from low-emitting gasoline vehicles. Federal Test Procedure (FTP) 3-phase bag values (THC, CO, CO2, and NOx) from an Ultra Low Emissions Vehicle (ULEV) have been used for most of the testing.