This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Nonlinear Transient Fuel Film Compensation (NTFC)
Annotation ability available
Sector:
Language:
English
Abstract
A very important component of an accurate steady state and transient air/fuel (A/F) ratio control strategy is the transient fuel compensation (TFC) substrategy. This is the part of an engine control algorithm which cancels the fuel film dynamics and makes it possible to place injected fuel into the intake manifold (or close to the intake ports or valves) of a spark ignition (SI) engine at the correct time and location.
This paper presents the results of a very large series of experiments conducted with the same engine with either a throttle body (TBI) (or central fuel injection (CFI)) manifold or with a multi-point port injection (MPI) (or electronic fuel injection (EFI)) manifold. These experiments have shown that in some practical applications it may be necessary to model the intake manifold as a two time constant dynamic system rather than as a single differential equation system.
A solution for the problem of correctly compensating for the nonlinear two time constant model is presented in the paper and tested on both TBI and MPI equipped engine mentioned above with excellent results. The experimental behavior of the engine (and its two different injection manifolds) has also been mapped in an extended temperature range using a deterministic compensation technique developed earlier. A “tuning” procedure is described which is simple and can easily be mechanized on a personal computer (PC) or a small computer. The results are thus immediately applicable to automatic production calibration applications.
Recommended Content
Authors
Topic
Citation
Hendricks, E., Vesterholm, T., Kaidantzis, P., Rasmussen, P. et al., "Nonlinear Transient Fuel Film Compensation (NTFC)," SAE Technical Paper 930767, 1993, https://doi.org/10.4271/930767.Also In
References
- Hendricks E. Sorenson S. C. “SI Engine Controls and Mean Value Engine Modelling” SAE Technical Paper No. 910258 , in SP-848 1991
- Hendricks E. Vesterholm T. “The Analysis of Mean Value SI Engine Models” SAE Technical Paper No. 920682 1992
- Hendricks E. Vesterholm T. “Nonlinear, Closed Loop, SI Engine Control Observers” SAE Technical Paper No. 920237 1992
- Aquino C. F. “Transient A/F Control Characteristics of the 5 Liter Central Fuel Injection Engine” SAE Technical Paper No. 910494 1991
- Washino S. Automotive Electronics , Gordon and Breach Science Publishers, NY NY 1989
- Nishiyama R. Ohkubo S. Washino S. “An Analysis of Controlled Factors Improving Transient A/F Control Characteristics” SAE Technical Paper No. 890761 , in SP-788 1989
- Benninger N. F. Plapp G. “Requirements and Performance of Engine Management Systems Under Transient Conditions” SAE Technical Paper No. 910083 1991
- Sekozawa T. Takahashi S. Shioya M. Ishii T. Asano S. “Development of a Highly Accurate Air-Fuel Control Method Based on Internal State Estimation” SAE Technical Paper No. 920290 , in SP-910, 1992 and United States Patent No. 4,939,658 3 July 1990 Sekozawa T. Shioya M. Funabashi M. Onari M. Shida M. Assignee: Hitachi, Ltd. Tokyo, Japan
- Melgaard H. Hendricks E. Madsen H. “Continuous Identification of a Four-Stroke SI Engine, Paper TP10-5:30, 1990” American Control Conference, San Diego CA 1990
- Wu H. Aquino C. F. Chou G. L. “A 1.6 Liter Engine and Intake Manifold Dynamic Model” ASME Paper No. 83-WA/DS-39 1983
- Servati H. Aquino C. F. “A Physically Based Wall Wetting Model to Predict Induction System Dynamics for Gasoline Engines” ASME Symp. on Simulation and Control of Ground Vehicles and Transportation Systems 80 2 1985
- Andersen K. The Institute of Automatic Control Systems (IACS) The Technical University of Denmark Lyngby, Denmark private communication 1990
- Aquino C. F. Fozo S. R. “Steady State Transient A/F Control Requirements for Cold Operation of a 1.6 Liter Engine with Single Point Fuel Injection” SAE Technical Paper No. 850509 1985
- Fozo S. R. Aquino C. F. “Transient A/F Characteristics for Cold Operation of a 1.6 Liter Engine with Sequential Fuel Injection” SAE Technical Paper No. 880691 1988
- Vesterholm T. Hendricks E. “Higher Order Continuous SI Engine Observers” 1992 American Control Conference (ACC), Paper No. WM1-14:20 Chicago IL, U. S. A. June 1992