The Development and Implementation of an Engine Off Natural Vacuum Test for Diagnosing Small Leaks in Evaporative Emissions Systems 2003-01-0719
This paper discusses an approach to detecting small leaks in an automobile's evaporative emissions systems that is a technique based upon ideal gas laws. It does this by monitoring pressure in the system while the vehicle's engine is off. This low cost solution can be easily implemented on General Motors vehicles using existing components. The topics covered in this paper include details on the background of the problem and the technique, the underlying thermodynamics of the technique, a description of the algorithm, testing and data collection considerations.
Citation: DeRonne, M., Labus, G., Lehner, C., Gonsiorowski, M. et al., "The Development and Implementation of an Engine Off Natural Vacuum Test for Diagnosing Small Leaks in Evaporative Emissions Systems," SAE Technical Paper 2003-01-0719, 2003, https://doi.org/10.4271/2003-01-0719. Download Citation
Michael DeRonne, Greg Labus, Chad Lehner, Marc Gonsiorowski, Bill Western, Kevin Wong
SAE 2003 World Congress & Exhibition
Electronic Engine Control Technologies, 2nd Edition-PT-110, Advanced Developments in Ultra-Clean Gasoline-Powered Vehicles-PT-104, Electronic Engine Controls 2003-SP-1749, SAE 2003 Transactions Journal of Engines-V112-3