This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Advanced Engine Control and Exhaust Gas Aftertreatment of a Leanburn SI Engine
Annotation ability available
Sector:
Language:
English
Abstract
The development of a leanburn engine is described, in which optimized engine design, innovative engine management and exhaust gas aftertreatment using a special NOx-storage catalyst were combined to yield a significant improvement in fuel economy with reduced NOx emissions. To achieve stable combustion near the lean limit a swirl system was used and the appropriate parameters of the 2.2 I 4-cyIinder 4-valve SI engine were optimized. As a result, the mixture formation was improved and the lean limit was extended to higher air-fuel ratios. An adaptive lambda controller which was based on the evaluation of engine-smoothness calculated from the RPM-sensor was implemented to control each cylinder individually close to the lean limit. A model-based control system was developed to achieve extremely accurate air-fuel ratio control during transients. This system also enabled optimal regeneration of the NOx-storage catalyst, by optimizing the lean to rich air-fuel ratio transitions and by holding the engine torque constant so that the regeneration phase was imperceptible to the driver.
Experimental results from the New European Driving Cycle (NEDC) show a significant improvement in fuel economy with exhaust emissions which are comparable to those of a stoichiometric concept. The whole system: optimized leanburn engine, advanced engine control system and exhaust gas aftertreatment which is introduced here is a promising way to improve fuel economy and to fulfill future emissions legislations.
Recommended Content
Authors
Topic
Citation
Fekete, N., Gruden, I., Voigtländer, D., Nester, U. et al., "Advanced Engine Control and Exhaust Gas Aftertreatment of a Leanburn SI Engine," SAE Technical Paper 972873, 1997, https://doi.org/10.4271/972873.Also In
References
- Fekete et al. Evaluation of NOx Storage Catalysts for Lean Burn Gasoline Fueled Passenger Cars SAE 970746 1997
- Kramer et al. Emissions Reduction in a Lean Burn Gasoline Engine 16 Vienna Engine Symposium 1995
- Inoue et al Toyota Lean Combustion System - The Third Generation System SAE 930873 1993
- Fekete Model-Based Air-Fuel Ratio Control of a Multi-Cylinder Leanburn Engine Stanford University 1995
- Fekete et al. Model-Based Air-Fuel Ratio Control of a Lean Multi-Cylinder Engine SAE 950846 1995
- Amstutz et al. Model-Based Air-Fuel Ratio Control in SI Engines with a Switch-Type EGO Sensor SAE 940972 1994
- Brogan et al. Evaluation of NOx Storage Catalysts as an Effective System for NOx Removal from the Exhaust Gas of Leanburn Engines SAE 952490 1995
- Abthoff et al 1992
- Gruden Vienna University 1997
- Voigtländer Dresden University 1997