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Advanced Canister Purge Algorithm with a Virtual [HC] sensor
Technical Paper
2000-01-0557
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SAE 2000 World Congress
Language:
English
Abstract
Both evaporative emissions and tailpipe emissions have been reduced by more than 90% from uncontrolled levels in state-of-the-art. However, now that the objective is to reach near-zero emission levels, the need for aggressive purging of the canister and fuel tank and the need for extremely precise control of engine Air/Fuel ratio (A/F) come into conflict. On-board diagnostics and the wide variation in operating conditions and fuel properties in the “real world” add to the challenge of resolving these conflicting requirements.
An advanced canister purge algorithm has been developed which substantially eliminates the effect of canister purge on A/F control by estimating and compensating for the fuel and air introduced by the purge system.
This paper describes the objectives and function of this algorithm and the validation of its performance. It discusses the value of a “systems solution” - matching software to a robust set of evaporative system components rather than using additional sensors and actuators for new fuel control and diagnostic functions.
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Citation
Grieve, M. and Himes, E., "Advanced Canister Purge Algorithm with a Virtual [HC] sensor," SAE Technical Paper 2000-01-0557, 2000, https://doi.org/10.4271/2000-01-0557.Also In
References
- Maloney et al. Pneumatic and Thermal State Estimators for Production Engine Control and Diagnostics SAE 980517
- Folkerts et al. Closed Loop Canister Purge Control System SAE 980206
- Majkowski et al. Development and Validation of a 0.020″ Evaporative Leak Diagnostic System Utilizing Vacuum Decay Methods SAE 1999-01-0861
- Nuiya et al. Reduction Technologies for Evaporative Emissions in Zero Level Emission Vehicle SAE 1999-01-0771
- Heywood Internal Combustion Engine Fundamentals 1988