This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Transient A/F Estimation and Control Using a Neural Network
Annotation ability available
Sector:
Language:
English
Abstract
A new estimator for IC engine A/F ratio is described. A/F ratio is important for engine operation since it determines the quantities of engine emissions, such as HC, CO, NOx, the conversion efficiency of catalyst systems, and the engine combustion stability. The A/F ratio estimator described in this paper is based on a fundamental metric that relies on inducing and detecting crankshaft speed fluctuations caused by modulating the engine's fuel injection pulse widths. Fuel pulse width modulation varies the instantaneous combustion A/F ratio crankshaft velocity. Synchronous measurement of crankshaft velocity provides a metric that, when used with other engine state variables as inputs to a conventional neural network, can accurately estimate A/F ratio. The estimator provides A/F information when a physical sensor is not available. This paper discusses the design of the A/F ratio neural network estimator, the transient performance during cold start operation, and the transient performance of a closed loop A/F ratio control system using the estimator for A/F ratio feedback.
Recommended Content
Authors
Topic
Citation
Asik, J., Peters, J., Meyer, G., and Tang, D., "Transient A/F Estimation and Control Using a Neural Network," SAE Technical Paper 970619, 1997, https://doi.org/10.4271/970619.Also In
References
- Matekunas F. A. “Engine Combustion Control with Ignition Timing by Pressure Ratio Measurement” Nov. 18 1986
- Gilkey J. G. “Fuel-Air Ratio Estimation from Cylinder Pressure in an IC Engine,” Stanford University Stanford, CA May 1989
- Patrick R. S. “Air-Fuel Ratio Estimation in an Otto Cycle Engine: Two Methods and Their Performance,” Stanford Univ. Stanford, CA May 1989
- Leisenring K. C. Rizzoni G. Samimy B. “Methods for Internal Combustion Engine Feedback Control During Cold-Start” SAE Paper No. 950842
- Gassenfeit E. H. Powell J. D. “Algorithms for air-fuel ratio estimation using internal combustion engine cylinder pressure” SAE Paper No. 890300
- Powell J. D. “Engine Control Using Cylinder Pressure: Past, Present, and Future” Journal of Dynamic Systems, Measurement, and Control 115 343 350 June 1993
- Hogh G. Powell B. K. Lawson G. P. “Real Time Engine Dynamic Analysis and Control” SAE Paper No. 885104
- Rizzoni G. “Estimation of indicated torque from crankshaft speed fluctuations: a model for the dynamics of the IC engine,” IEEE Trans. Veh. Tech. 38 3 168 179 August 1989
- Kao M. Moskwa J. J. 1994 “Engine load and equivalence ratio estimation for control and diagnostics via nonlinear sliding observers” Int. J. of Vehicle Design 15 3 4 5 358 368
- Asik J. R. Meyer G. M. Tang D. X. “A/F Ratio Estimation and Control Based on Induced Engine Roughness” Proceedings of 1996 IEEE International Conference on Control Applications 781 785 Dearborn, MI Sept. 15-18 1996
- Heywood J. B. Internal Combustion Engine Fundamentals McGraw-Hill
- Federal Test Procedure (FTP or FTP75)