Control of recompression HCCI with a three region switching controller

Liao, Hsien-Hsin; Widd, Anders; Ravi, Nikhil; Jungkunz, Adam F.; Kang, Jun-Mo; Gerdes, J. Christian

doi:10.1016/j.conengprac.2012.09.003

Cited by 17 publications

(14 citation statements)

References 13 publications

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“…Chiang and Stefanopoulou [11] demonstrated that a single temperature state can model the existence of multiple equilibria for rebreathing HCCI through a bowl-shaped T ivc -T bd combustion curve. Later, similar analysis was performed in [19] for recompression HCCI, where they hypothesize that the negative eigenvalue is caused by an increased heat transfer around TDC.…”

Section: A Unburned Fuel Dynamics As the Primary Cause Of High CVmentioning

confidence: 89%

“…It is well established in [4], [11], [13], [19], [27], and [28] that late phasing HCCI combustion dynamics are qualitatively different from the dynamics seen at early to mid combustion phasings. Experimentally observed CV, as measured by variance of θ 50 , increases significantly after a certain threshold value of θ 50 , while combustion stability as well as efficiency drop sharply soon after this threshold.…”

Section: CV In Hccimentioning

confidence: 98%

“…Characterizing and understanding this increased θ 50 CV is important as steady-state controllers designed to regulate combustion phasing in the late phasing high CV region have been shown to be destabilizing in the normal phasing stable regions and vice-versa [14], [15], [19]. The controller must know the current nature of the combustion dynamics while determining the control input to be applied in the next cycle.…”

Section: CV In Hccimentioning

confidence: 99%

“…In low-order control-oriented HCCI models [11], [14], [15], [19], the high CV dynamic behavior at late phasings manifests itself as a negative discrete eigenvalue, which is associated with oscillatory dynamics. Researchers differ on the physical explanation for this negative eigenvalue.…”

Section: A Unburned Fuel Dynamics As the Primary Cause Of High CVmentioning

confidence: 99%

“…Some HCCI control strategies found in the literature are validated to track steps in desired combustion phasing at a single load-speed HCCI operating point [18], [19]. Others regulate combustion phasing during load steps at a fixed engine speed [20]- [23] or track steps in desired location and magnitude in peak pressure [24], [25].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Controlled Load and Speed Transitions in a Multicylinder Recompression HCCI Engine

Jade

Larimore

Hellström

et al. 2015

IEEE Trans. Contr. Syst. Technol.

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A model-based control strategy to track combustion phasing during load and speed transitions in the homogeneous charge compression ignition (HCCI) operating region of a multimode combustion engine is presented in this paper. HCCI transitions can traverse regions of high cyclic variability (CV), even if the steady state transition end points are stable with low CV. A control-oriented HCCI model for both the stable, low CV region and the oscillatory, high CV, late phasing region is used to design a controller that uses valve and fuel injection timings to track combustion phasing. Novel aspects of the controller include nonlinear model-inversion-based feedforward and gain scheduled feedback based on unburned fuel that reduces transient CV. Transitions tested on a multicylinder HCCI engine include load transitions at fixed engine speeds, simultaneous load, and speed transitions, and select FTP75 drive-cycle transitions with high load slew rates. Good combustion phasing tracking performance is demonstrated, and misfires are prevented.

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Section: A Unburned Fuel Dynamics As the Primary Cause Of High CVmentioning

confidence: 89%