Model-Based Control of HCCI Engines Using Exhaust Recompression

Ravi, Nikhil; Roelle, Matthew J.; Liao, Hsien-Hsin; Jungkunz, Adam F.; Chang, Chen-Fang; Park, Sungbae; Gerdes, J. Christian

doi:10.1109/tcst.2009.2036599

Cited by 73 publications

(45 citation statements)

References 6 publications

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“…Ravi et al [10] originally presented the nonlinear model upon which this work is based. The model is a discretetime, nonlinear model of the HCCI combustion process that features three states, a single-input, and a single output.…”

Section: Model Descriptionmentioning

confidence: 99%

Late phasing homogeneous charge compression ignition cycle-to-cycle combustion timing control with fuel quantity input

Jungkunz¹,

Erlien²,

Gerdes³

2012

2012 American Control Conference (ACC)

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Late-phasing homogeneous charge compression ignition (HCCI) operating conditions have the potential to expand the useful operating range of HCCI. However, these conditions exhibit significant variation in combustion timing and work output from one cycle to the next. Cyclic variations in the combustion timing of HCCI combustion at late-phasing operating conditions can be removed through the use of cycleto-cycle control of fuel injection quantity. A nonlinear, discretetime model of the recompression HCCI process captures the oscillations in late-phasing HCCI; when this model is linearized, it represents these dynamics as a pole on the negative realaxis. A simple lag compensator eliminates the oscillations in combustion phasing and drastically improves the operability of late-phasing HCCI in both simulation and experiment.

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Section: Model Descriptionmentioning

confidence: 99%

Late phasing homogeneous charge compression ignition cycle-to-cycle combustion timing control with fuel quantity input

Jungkunz¹,

Erlien²,

Gerdes³

2012

2012 American Control Conference (ACC)

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“…In previous work [11], a nonlinear physical model that captures the basic dynamics of the HCCI process has been presented. This model was linearized about an operating point and shown to be useful for the development of controllers that could be used to control the work output and combustion phasing on a cycle-by-cycle basis on both a single and multi-cylinder engine.…”

Section: Incorporation Into Existing Model Structurementioning

confidence: 99%

“…The outputs are controlled using three inputs: 1) Total moles of fuel injected in the current cycle, n f,k 2) Cylinder volume at intake valve closure, V IV C,k and 3) Cylinder volume at exhaust valve closure, V EV C,k This model assumes that the fuel is all injected at the end of the recompression stroke (during induction) and so does not consider the effect of a split injection strategy. A complete description of this model can be found in [10], [11].…”

Section: Incorporation Into Existing Model Structurementioning

confidence: 99%

“…In previous work, it has been shown that the two outputs, N M EP and CA 50 can be controlled separately with the fuel quantity and valve timings respectively [11]. This is because the N M EP is a strong function of the total fuel injected into the cylinder within a range of combustion phasing.…”

Section: Controller Developmentmentioning

confidence: 99%

“…In this operating region, it is seen that the vaporization and pyrolysis of fuel dominate, and there is little fuel reforming or exothermic reaction. The modeling approach is based on a simple physical model of the process that integrates into a control model scheme presented in previous work [10], [11]. A split injection strategy is used, with the injection timing of a small quantity of pilot fuel (1mg) used to control combustion phasing, which is modeled with a global Arrhenius reaction rate equation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and control of exhaust recompression HCCI using split injection

Ravi

Liao

Jungkunz

et al. 2010

Proceedings of the 2010 American Control Conference

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Homogeneous charge compression ignition (HCCI) is currently being pursued as a cleaner and more efficient alternative to conventional engine strategies. This paper presents an approach for modeling the effect of a small pilot injection during recompression on combustion in an HCCI engine with exhaust trapping, and a controller that uses the timing of this pilot injection to control the phasing of combustion. The model is incorporated into a nonlinear physical model presented in previous work that captures the effect of fuel quantity and intake and exhaust valve timings on work output and combustion phasing. It is seen that around the operating points considered, the effect of a pilot injection can be modeled as a change in the Arrhenius threshold, an analytical construct used to model the phasing of combustion as a function of the thermodynamic state of the reactant mixture. The relationship between injection timing and combustion phasing can be separated into a linear, analytical component and a nonlinear, empirical component. A feedback controller based on this model is seen to be effective in tracking a desired load-phasing trajectory and enables steady operation at low load conditions.

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Adaptive control of homogeneous charge compression ignition engines

Chiang

Chou

Lin

2013

Adaptive Control & Signal

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This paper presents an adaptive controller, which maintains consistent ignition timing control of a gasoline homogeneous charge compression ignition engine with high dilution in the presence of uncertainty or unknown variation in plant parameters such as exhaust runner wall temperature and cylinder charge properties. The control of the combustion timing is based on manipulating the charge temperature through internal dilution, which is achieved by controlling the lift of a secondary opening of the exhaust valves, also known as the rebreathing lift. The adaptive controller is designed on the basis of a simplified bilinear parametric model, which contains only the cycle-to-cycle combustion timing dynamics. Implementation of the designed adaptive controller involves feedforward of the injected fuel and feedback of the combustion timings CA 50 and CA 90 when 50% and 90% of energy are released, respectively, which alleviates the impact of inevitable errors in estimation of in-cylinder charge properties such as temperature, pressure, and compositions. It is shown through convergence analysis and closed-loop simulation of a full-order engine model that the adaptive controller is able to drive the combustion timing CA 50 to desired set points by stabilizing the bilinear dynamics when plant parameters are changing.

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Model-Based Control of HCCI Engines Using Exhaust Recompression

Cited by 73 publications

References 6 publications

Late phasing homogeneous charge compression ignition cycle-to-cycle combustion timing control with fuel quantity input

Late phasing homogeneous charge compression ignition cycle-to-cycle combustion timing control with fuel quantity input

Modeling and control of exhaust recompression HCCI using split injection

Adaptive control of homogeneous charge compression ignition engines

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