Actuation schemes exist that permit the joint management of air and fuel flow into the cylinders of a spark ignition engine. With the exception of drive by wire systems, to-date, the transient control aspects of these schemes, collectively refered to here as secondary cylinder air flow actuators, has not received any attention from the control community. This paper takes a first step in the analysis of the simultaneous dynamic control of air fuel ratio and torque response using secondary actuators placed before the intake ports of the cylinders, when used in combination with standard fuel injectors and primary throttle regulated by the driver. The emphasis is on basic issues of designing a feedforward scheme to enhance actuator authority for feedback control, and the fundamental multivariable nature of the feedback problem. Enhanced transient air-to-fuel ratio performance improvement is shown to be possible without sacrificing engine torque response with respect to a conventional engine. In addition, this is achieved with overall higher manifold pressure, offering the possibility of reduced pumping losses in the engine, depending on the actual actuation scheme employed.

Issue Section:
Technical Papers
Topics:
Actuators, Air flow, Cylinders, Fuels, Torque, Engines, Feedback, Transients (Dynamics), Design, Feedforward control, Flow (Dynamics), Fuel injectors, Gates (Closures), Manifolds, Pressure, Spark-ignition engine, Wire
1.
Aquino, C. F., 1981, “Transient A/F Control Characteristics of the 5 Liter Central Injection Engine,” SAE Paper No. 810494.
2.
Ashhab, M. S., Stefanopoulou A. G., Cook J. A., and Levin, M., 1998, “Camless Engine Control for Robust Unthrottled Operation,” SAE Paper No. 981031.
3.
Bidan
P.
,
Boverie
S.
, and
Chaumerliac
V.
,
1993
, “
Nonlinear Control of a Spark Ignition Engine
,”
IEEE Trans. Control Systems Technology
, Vol.
3
, No.
1
, pp.
4
–
13
.
4.
Chang, C. -F., Fakete, N. P., and Powell, J. D., 1993, “Engine Air-Fuel Ratio Control Using an Event-Based Observer,” SAE Paper No. 930766.
5.
Crossley, P. R., and Cook, J. A., 1991, “A Nonlinear Model for Drivetrain System Development,” IEE Conference ‘Control 91’, Edinburgh, U.K., March 25–28, IEE Conference Publication 332, Vol. 2, pp. 921–925.
6.
Emtage, A. L., Lawson P. A., Passmore M. A., Lucas G. G., and Adcock P. L., 1991, “The Development of an Automotive Drive-By-Wire Throttle System as a Research Tool,” SAE Paper No. 910081.
7.
Foss, A. M., Heath R. P. G., Heyworth P., Cook J. A., and McLean J., 1989, “Thermodynamic Simulation of a Turbocharged Spark Ignition Engine for Electronic Control Development,” Proc. of the Inst. Mech. Eng. Seventh International Conference on Automotive Electronics, London, U.K., C391/044, pp. 195–202.
8.
Gray, C., 1988, “A Review of Variable Engine Valve Timing,” SAE Paper No. 880386.
9.
Grizzle, J. W., Cook, J. A., and Milam, W. P., 1994, “Improved Transient Air-Fuel Ratio Control using Air Charge Estimator,” Proc. 1994 Amer. Contr. Conf., Vol. 2, pp. 1568–1572.
10.
Hendricks, E., Jensen M., Kaidatzis P., Rasmussen P., and Vesterholm T., 1993, “Transient A/F Ratio Error in Conventional SI Engines Controllers,” SAE Paper No. 930856.
11.
J. B. Heywood, 1988, Internal Combustion Engine Fundamentals, McGraw-Hill.
12.
Kang, J., and Grizzle, J. W., 1998, “Engine Air-fuel-ratio and Torque Control by using Secondary Throttles,” Advances in Automotive Control, Proc. of IFAC Workshop, pp. 203–210.
13.
J. Kang, and J. W. Grizzle, 1999, “Nonlinear Control of Joint Air and Fuel Management in a SI Engine,” submitted to 1999 American Control Conference.
14.
Ma, T. H., 1988, “Effects of Variable Engine Valve Timing on Fuel Economy,” SAE Paper No. 880390.
15.
Manz, P.-W., 1992, “Influence of a Rapid Throttle Opening on the Transient Behavior of an Otto Engine,” SAE Paper No. 922234.
16.
Moraal, P. E., 1995, “Adaptive Compensation of Fuel Dynamics in an SI Engine using a Switching EGO Sensor,” Proc. 1995 Conf. on Decision and Control, pp. 661–667, New Orleans.
17.
Moraal, P. E., Cook J. A., and Grizzle J. W., 1995, “Modeling the induction process of an automobile engine,” Control Problems in Industry, Lasiecka I. and Morton B., eds., Birkhauser, pp. 253–270.
18.
Moraal, P. E., Grizzle, J. W., and Cook, J. A., 1993, “An Observer for Single-Sensor Individual Cylinder Pressure Control,” Proc. 1993 Conf. on Decision and Control, Vol. 3, pp. 2955–2961.
19.
Nishiyama, R., Okhubo S., and Washino S., 1989, “An Analysis of Controlled Factors Improving Transient A/F Ratio Control Characteristics,” SAE Paper No. 890761.
20.
Novak, J. M. 1977, “Simulation of the Breathing Process and Air-Fuel Ratio Distribution Characteristics of Three-Valve, Stratified Charge Engines,” SAE Paper No. 770881.
21.
Powell, B. K., and Cook, J. A., 1987, “Nonlinear Low Frequency Phenomenological Engine Modeling and Analysis,” Proc. 1987 Amer. Contr. Conf., Vol. 1, pp. 332–340.
22.
Powell
J. D.
,
1993
, “
Engine Control Using Cylinder Pressure: Past, Present and Future
,”
ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL
, Vol.
115
, pp.
343
–
350
.
23.
Prabhakar, R., Citron S. J., and Goodson R. E., 1975, “Optimization of Automobile Engine Fuel Economy and Emissions,” ASME Paper 75-WA/Aut-19.
24.
Prabakhar, R., 1975, “Optimal and Suboptimal Control of Automotive Engine Efficiency and Emissions,” Ph.D. thesis, Purdue University, West Lafayette, IN.
25.
Schecter, M. M., and Levin M. B., 1996, “Camless Engine,” SAE Paper No. 960581.
26.
K. Srinivasan, G. Rizzoni, M. Trigui, and G,-C, Luh, 1992, “On Line Estimation of net Engine Torque from Crankshaft Angular Velocity Measurements Using Repetitive Estimators,” Proc. 1992 Amer. Contr. Conf., Vol. 1, pp. 516–520.
27.
Stefanopoulou A. G., Butts K. R., Cook J. A., Freudenberg J. S., and Grizzle J. W., 1995, “Automotive Powertrain Control for Modular Controller Architectures: A Case Study,” Proc. 1995 Conference on Decision and Control, pp. 768–773.
28.
Stefanopoulou A. G., Freudenberg J. S., and Grizzle J. W., 1999, “Variable Camshaft Timing Engine Control,” to appear in the IEEE Transactions on Control System Technology.
29.
Turin, R. and Geering H. P., 1995, “Model-based Adaptive Fuel Control in an SI Engine,” SAE Paper 940374.
30.
Tuttl, J. H., 1980, “Controlling Engine Load by Means of Late Intake-Valve Closing,” SAE Paper No. 800794.
31.
Vogel, O., Roussopoulos K., Guzzella L., and Czekai J., “An Initial Study of Variable Valve Timing Implemented with a Secondary Valve in the Intake Runner,” SAE Paper No. 960590.
32.
Zhang
Z.
, and
Freudenberg
J. S.
,
1990
, “
Loop Transfer Recovery for Nonminimum Phase Plants
,”
IEEE Trans. on Automatic Control
, Vol.
35
, No.
5
, pp.
547
–
553
.
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