This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Estimation of Air Fuel Ratio of a SI Engine from Exhaust Gas Temperature at Cold Start Condition
Technical Paper
2002-01-1667
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Wall wetting of injected fuel onto the intake manifold and cylinder wall causes unpredictable transient behavior of air-fuel mixing which results in a significant emission of unburned hydrocarbon (HC) emission during cold start operation. Heated exhaust gas oxygen (HEGO) sensors cannot measure the air-fuel ratio (A/F) of exhaust gas during cold start condition. Precise and fast estimation of air/fuel ratio of the exhaust gas is required to elucidate the wall wetting phenomena and subsequent HC formation. Refined A/F estimation can enable the control of fuel injection minimizing HC emissions during cold start conditions so that HC emissions can be minimized.
A new estimator for A/F of the exhaust gas has been developed. The A/F estimator described in this study utilizes measured exhaust gas temperature and general engine parameters such as engine speed, airflow, coolant temperature, etc. A fast response, fine-wire thermocouple was used to measure exhaust gas temperatures and a fast response flame ionization detector was used to measure HC emissions during the cold start period. A Generalized Regression Neural Network Function Approximation (GRNN) was used to estimate the A/F of exhaust gas. The A/F traces generated by the GRNN algorithm agree very well with measurements.
Recommended Content
Authors
Citation
Lee, T., Bae, C., Bohac, S., and Assanis, D., "Estimation of Air Fuel Ratio of a SI Engine from Exhaust Gas Temperature at Cold Start Condition," SAE Technical Paper 2002-01-1667, 2002, https://doi.org/10.4271/2002-01-1667.Also In
References
- Takeda Keiso Yaegashi Takehisa Sekiguchi Kiy onoro Saito Kimitaka Imatake Noburo “Mixture Preparation and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-up” SAE technical paper No. 950074 1995
- Laurikko Juhani Erlandsson Lennart Abrahamsson Reino “Exhaust Emissions in Cold Ambient Conditions: Considerations for a European Test Procedure” SAE technical paper No. 950929 1995
- Shayler, P. J. Davies, M. T. Scarisbrick, A. “Audit of Fuel Utilisation during the Warm-Up of SI Engines” SAE technical paper No. 971656 1997
- Anderson M.J. “A Feedback A/F Control System for Low Emission Vehicles” SAE Paper No. 930388 1993
- Pestana G. W. “Engine Control Methods Using Combustion Pressure Feedback” SAE Paper No. 890758 1989
- Asik Joseph R. Peters+ Jennifer M. Meyer Garth M. Tang Donald X. “Transient A/F Estimation and Control Using a Neural Network” SAE technical paper No. 970619 1997
- Heywood John. B. “Internal Combustion Engine” McGRAW-HILL 770 1988
- Cheng, W. Summers, T. Collins, N. “The Fast Response Flame Ionization Detector” Prog. Energy Combust. Sci. 24 89 124 1998
- Carbon M. W. Kutsch H. J. Hawkins G. A. “The Response of Thermocouples to Rapid Gas-Temperature Changes” Transaction of the ASME July 1950
- Lenz Ulrich Schroeder Dierk “Artificial Intelligence for Combustion Engine Control,” SAE technical paper No. 960328 1996
- Asik Josehp R. Meyer Garth M. Tang Donald X. “A/F Estimation and Control Based on Induced Engine Roughness” Proceeding of the 1996 IEEE International Conference on Control Applications Sep 15-18 1996
- Chang Chen-Fang Fekete Nicholas P. Amstutz Alois Powell J. David 1995 “Air-Fuel Ratio Control in Spark-Ignition Engines Using Estimation Theory” IEEE TRANSACTION ON CONTROL SYSTEMS 3 1 March 1995
- Leistering Kenneth Samimy Bahman Rizzoni Giogio 1996 “IC Engine Air/Fuel Ratio Feedback Control During Cold Start” SAE technical paper No. 961022 1996
- Lenz Ulrich Schroede Dierk “Transient Air-Fuel Ratio Control Using Artificial Intelligence” SAE technical paper No. 970618 1997