1996-08-01

Study of In-Use Alternative Fuel Vehicle Emission Performance Under EPA and BC AirCare Test Cycles 961709

The Province of BC requires all light duty vehicles in the lower mainland to pass or conditionally pass an emissions inspection as a condition of license and insurance renewal. Vehicles converted to natural gas and propane fail emissions tests at higher rates than comparable vehicles run on gasoline.
Work is described to investigate the emissions performance of vehicles fitted with after-market conversions. FTP 75, Hot 505 and BC AirCare test cycles (total 74) were performed on a variety of vehicles (total 20) which were split between dual-fuel and mono-fuel using propane or natural gas along with gasoline. All but three vehicles were supplied by the manufacturer to run on gasoline with closed-loop air/fuel ratio feedback. The after market conversions consisted of both open-loop and closed-loop feedback systems for the gaseous fuel systems. The emissions performance of current gaseous fuel control technology against pre-1993 technology and the operation of dual-fuel vehicles on both fuels against original gasoline performance or against the vehicle's emissions standards were assessed. The open-loop control systems on two vehicles were upgraded to closed-loop systems and the improvements in emission performance were demonstrated.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Development of a Clean, Efficient, Propane-Fueled Tractor

2003-01-1923

View Details

TECHNICAL PAPER

Vehicle Evaporative and Exhaust Emissions as Influenced by Benzene Content of Gasoline

860531

View Details

TECHNICAL PAPER

Evaporative Emissions from Late-Model In-Use Vehicles

2000-01-2958

View Details

X