This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Spark Ignition Engine Fuel Economy Control Optimization-Techniques and Procedures
Annotation ability available
Sector:
Language:
English
Abstract
An analysis is presented for the quantitative evaluation of spark ignition engine control parameters (spark advance, air-to-fuel ratio, exhaust gas recirculation) for optimal fuel economy, constrained emission levels and tradeoffs. Emphasis is placed on the procedures and techniques adopted for the off-line approach using steady state mapping dynamometer data of conventional engines in production. The analysis structure is composed primarily of existing documented tools, in particular, a) vehicle simulation programs, b) FTP-urban and highway drive cycle schedule, c) multiple regression techniques, and d) dynamic programming procedures. Analytical methods are evaluated along with illustrative examples, and discussions are presented on their sensitivities. Applications of engine control parameter optimizations are also illustrated with reference to two engine (one eight and one four cylinder) data bases.
Major factors are discussed. Results are presented on fuel economy as a function of three regulated emissions and engine settings, and on increase/decrease in fuel economy concerned with the emission contraint, emission control strategy, and vehicle drive cycle.
Recommended Content
| Technical Paper | A Computerized On-Line Approach to Calculating Optimum Engine Calibrations |
| Technical Paper | Low Pressure Cooled EGR Transient Estimation and Measurement for an Turbocharged SI Engine |
Authors
Topic
Citation
Trella, T., "Spark Ignition Engine Fuel Economy Control Optimization-Techniques and Procedures," SAE Technical Paper 790179, 1979, https://doi.org/10.4271/790179.Also In
References
- Cassidy J.F. “A Computerized On-Line Approach to Calculating Optimum Engine Calibrations,” General Motors Research Laboratories Report SAE 770078
- Vora L. “Computerized Five Parameter Engine Mapping,” General Motors Research Laboratories Report
- Rishavy E.A. et al. “Engine Economy with Emission Constraints,” SAE 770075
- Auiler J.F. et al. “Optimization of Automotive Engine Calibration for Better Fuel Economy - Methods and Applications,” SAE 770076
- Dohner A.R. “Transient System Optimization of an Experimental Engine Control System Over the Federal Emissions Driving Schedule,” SAE- 780286
- Bellman Drayfus “Applied Dynamic Programming,” Princeton University Press 1962
- Mencik Z. Blumberg P.N. “Representation of Engine Data by Multi-Variate Least Squares Regression,” SAE 780288
- Report No. DOT-TSC-NHTSA-78-3 April 1978
- American Motors Corporation Data Source