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Development and Validation of a 0.020″ Evaporative Leak Diagnostic System Utilizing Vacuum Decay Methods
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1999 by SAE International in United States
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This paper describes the development of a vacuum-decay based evaporative leak detection sub-system that meets the model year 2000 California Air Resources Board (CARB) requirements.1 The diagnostic algorithm was developed and tested to create a production intent calibration. In addition, the calibration was validated during a four month test period of diagnostic and driveability performance, which included hot ambient, high volatility fuels, and altitude. It was found to detect 0.020 inch leaks reliably in-use, while being robust to misdiagnosis of smaller leaks.
CitationMajkowski, S., Simpson, K., and Steckler, M., "Development and Validation of a 0.020″ Evaporative Leak Diagnostic System Utilizing Vacuum Decay Methods," SAE Technical Paper 1999-01-0861, 1999, https://doi.org/10.4271/1999-01-0861.
- Maloney, P.J. Olin P. M. “Pneumatic and Thermal State Estimators for Production Engine Control and Diagnostics,” SAE 980517 1997
- D'Souza, F. A. “Design of Control Systems,” Prentice-Hall 1988