Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap

Ortiz-Soto, Elliott; Vávra, Jiří; Babajimopoulos, Aristotelis

doi:10.1115/icef2011-60167

Cited by 20 publications

(13 citation statements)

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“…Due to this sensitivity, it is desirable to estimate the residual gas fraction online. There have been several methods described in the literature 15–18 for offline estimation of the residual mass for steady-state conditions. This work presents a method of residual estimation which is computationally simple enough to be implemented online while still maintaining a physical basis and alleviating the need of steady-state conditions.…”

Section: Introductionmentioning

confidence: 99%

Real-time internal residual mass estimation for combustion with high cyclic variability

Larimore

Hellström

Jade

et al. 2014

International Journal of Engine Research

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In this work, a physics-based method of estimating the residual mass in a recompression homogeneous charge compression ignition engine is developed and analyzed for real-time implementation. The estimation routine is achieved through in-cylinder pressure and exhaust temperature measurements coupled with energy and mass conservation laws applied during the exhaust period. Experimental results on a multicylinder gasoline homogeneous charge compression ignition engine and dynamic analysis demonstrate the estimation routine’s ability to perform across a wide range of operating conditions as well as on a cycle-by-cycle basis for highly variable combustion phasing data.

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Section: Introductionmentioning

confidence: 99%

Real-time internal residual mass estimation for combustion with high cyclic variability

Larimore

Hellström

Jade

et al. 2014

International Journal of Engine Research

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“…The total residual mass is predicted using the state estimation method. 13,29 Measurements of exhaust pressure are obtained with a cooled Kistler 4045A pressure sensor in the exhaust runner. Air-tofuel ratio is determined using an ETAS ES630.1 lambda module with a Bosch LSU 4.9 wideband lambda sensor.…”

Section: Enginementioning

confidence: 99%

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Powell

O’Donnell

Hoffman

et al. 2019

International Journal of Engine Research

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Heat transfer has a profound influence on homogeneous charge compression ignition combustion. When a thermal barrier coating is applied to the combustion chamber, the insulating effect magnifies the wall temperature swing, decreasing heat transfer during combustion. This enables improvements in both thermal and combustion efficiency without the detrimental impacts of intake charge heating. Increasing the temperature swing requires coatings with lower thermal conductivity and heat capacity. A promising avenue for simultaneously decreasing both thermal conductivity and capacity is to increase the porosity fraction. A proprietary solution precursor plasma spray process enables discrete organization of the porosity structure, called inter-pass boundaries, which in turn produces a step-reduction in thermal conductivity for a given porosity level. In this investigation, yttria-stabilized zirconia is used to create four different thermal barrier coatings to study the potential of structured porosity as means of improving the “temperature swing” behavior in a homogeneous charge compression ignition engine. The baseline coating is “dense YSZ,” applied using a standard air-plasma spray process. Next, significant reductions of the thermal conductivity are achieved by utilizing the solution precursor plasma spray process to create inter-pass boundaries with a moderate overall porosity. Performance, efficiency, and emissions are compared against both a baseline configuration with a metal piston and an air-plasma spray “dense YSZ” coating. Experiments are carried out in a single-cylinder gasoline homogeneous charge compression ignition engine with exhaust re-induction. Experiments indicate that incorporating structured porosity into thermal barrier coatings produces tangible gains in combustion and thermal efficiencies. However, there is an upper limit to porosity levels acceptable for homogeneous charge compression ignition engine application because an elevated porosity fraction leads to excessive surface roughness and undesirable fuel interactions. Comparison of the coatings showed the best results with coating thickness of up to 150 µm. Thicker coatings led to slower surface temperature response and attenuated swing temperature magnitude.

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“…mi-EGR is the internal residual mass and was estimated by several different methods. The Mirsky Method, which is sufficiently accurate and requires simple calculations, was proposed by Yun and Mirsky and is chosen for calculating i-EGR ratio [31].  represents the ratio of specific heats.…”

Section: Experiments Study 21 Experimental Setupmentioning

confidence: 99%

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

Zhou

Dong

Hua

et al. 2018

Applied Thermal Engineering

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Spark assisted compression ignition (SACI) is a proven method for extending the load range and controlling the combustion phase of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. However, the occurrence of abnormal combustion, such as knock, limits the improvement of efficiency in SACI combustion. In this study, the effects of a coupling strategy, which combines internal/external exhaust gas recirculation (i & e-EGR) and split injection, on knock suppression in SACI mode were investigated in a high-compression-ratio, single-cylinder gasoline engine with a fully variable valve system. During the experiment, the mass of intake air remained constant while e-EGR was added. The results show that the coupling strategy combines the advantages of e-EGR and split injection, providing an effective method for resisting knock and improving engine efficiency. The results also demonstrate that applying e-EGR to SACI combustion significantly decreases the knock intensity by effectively reducing the in-cylinder temperature. In addition, the effect of split injection on knock suppression is related to the initial in-cylinder temperature and fuel stratification. With high initial in-cylinder temperature, the relationship between knock probability and split injection timing is non-monotonic. However, with low initial in-cylinder temperature, the capacity of resisting knock monotonically increases with the delay of secondary injection timing.

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Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap

Cited by 20 publications

References 0 publications

Real-time internal residual mass estimation for combustion with high cyclic variability

Real-time internal residual mass estimation for combustion with high cyclic variability

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

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