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Research Papers

Multicylinder HCCI Control With Coupled Valve Actuation Using Model Predictive Control

[+] Author and Article Information
Stephen M. Erlien

e-mail: serlien@stanford.edu

Adam F. Jungkunz

e-mail: jungkunz@stanford.edu

J. Christian Gerdes

e-mail: gerdes@stanford.edu
Dynamic Design Lab,
Department of Mechanical Engineering,
Stanford University,
Stanford, CA 94305

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received August 9, 2012; final manuscript received April 8, 2013; published online July 18, 2013. Assoc. Editor: Gregory Shaver.

J. Dyn. Sys., Meas., Control 135(5), 051018 (Jul 18, 2013) (7 pages) Paper No: DS-12-1255; doi: 10.1115/1.4024299 History: Received August 09, 2012; Revised April 08, 2013

Recent work in homogeneous charge compression ignition (HCCI) engine control has focused on the use of variable valve timing (VVT) as a near term implementation strategy. Valve timing has a significant influence on combustion phasing and can be implemented with cam-based VVT systems already available in production vehicles. However, these systems introduce cylinder coupling via a shared actuator. This paper presents a model predictive control (MPC) framework that explicitly accounts for this intercylinder coupling as a constraint on the system. The execution time step of this MPC controller is shorter than the prediction time step, enabling consideration of a common actuator across otherwise independent systems as the engine cycle progresses. This enables effective use of the cylinder independent actuators to augment the shared actuator in achieving the control objectives. Experiments on a multicylinder HCCI engine test bed validate this approach to handling coupled actuation and illustrate effective use of cylinder independent actuators in response to limited capabilities of the shared actuator.

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References

Figures

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Fig. 2

Cylinder volume as a function of CAD. Shaded region indicates typical exhaust valve closing timing, θEVC, for recompression HCCI.

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Fig. 3

Controller block diagram

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Fig. 4

Experimental results of cylinder variation with identical inputs

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Fig. 5

Experimental results of closed loop behavior with n = 2 cylinders and a fast cam slew rate of 300 deg/s

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Fig. 6

Experimental results of closed loop behavior with n = 2 cylinders and a slow cam slew rate of 50 deg/s

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Fig. 7

Experimental results with n = 4 cylinders and a moderate cam slew rate of 200 deg/s. Controller turned on at 10 s. Cylinder combustion order is 1 3 4 2.

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