Investigation of Combustion Knock Distribution in a Boosted Methane-Gasoline Blended Fueled SI Engine

Yang, Zhuyong; Rao, Sandesh; Wang, Yanyu; Harsulkar, Jaideep; Ansari, Ehsan; Narasimhamurthy, Niranjan Miganakallu; Dice, Paul; Naber, Jeffrey; Lonari, Yashodeep; Szwaja, S.

doi:10.4271/2018-01-0215

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…The spark timing was held constant as the methane fuel fraction was progressively increased. Consistent with previous research on combustion knock with a range of engines and fuels [27][28][29], the knock intensity can be well characterized by a log-normal distribution. The location of the mean as well as the spread of the log-normal distribution ultimately depend on several factors.…”

Section: Knock Analysissupporting

confidence: 86%

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Singh

Morganti

Dibble

2019

Fuel

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Natural gas is a high-octane fuel that produces lower CO 2 emissions per kilowatt hour than liquid transport fuels, with essentially zero sulfur emissions. Historically, natural gas has mostly been used in power generation and industrial applications. However, there has been a recent shift towards employing natural gas in the transport sector. In many developing countries, existing vehicles are retrofitted with compressed natural gas (CNG) systems, enabling operation on both gasoline and natural gas (and theoretical mixtures thereof). This work examines the effect of leveraging the secondary natural gas fuel system on the performance, efficiency and broader environmental impact of a high specific output gasoline engine. Firstly, mixture sweeps are presented for varying gasoline/natural gas ratios (100% gasoline to 100% natural gas) at wide open throttle (WOT) with both fixed and variable spark timing. This baseline information is then used to optimize the engine calibration for varying gasoline/natural gas ratios over a wider range of operating conditions. Finally, the CO 2-equivalent emissions are computed to elucidate the broader environmental impact of an optimized gasoline/natural gas vehicle. This study suggests that more advanced control systems which enable vehicles to use both gasoline and natural gas simultaneously may provide a range of social, economic and environmental benefits.

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Section: Knock Analysissupporting

confidence: 86%

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Singh

Morganti

Dibble

2019

Fuel

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“…As known, diluent simply lengthens combustion duration, so reduces combustion knock intensity. In this case, higher exhaust residuals might lead to opposite correlation due to increase in temperature of fresh charge by higher ExR content [10,11].…”

Section: In-cylinder Exhaust Residuals Impactmentioning

confidence: 99%

Knock Reduction Measures in the Gas Fuelled Internal Combustion Engine

Szwaja

2020

Nauka teh.

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Studies on the influence of applying various technologies for combustion knock reduction have been presented in the paper. Among others, investigation concerning the following: over-expanded cycle, variable valve timing, internal and exhaust gas recirculation, leaning the combustible mixture and cooling the in-cylinder charge were of the interest. The research works were focused on impact of these technologies on both knock intensity reduction, and engine performance and toxic emissions. Results presented in the paper were coming from experimental investigation based on in-cylinder combustion pressure data acquisition. Additionally, knock intensity calculation methods were discussed. They are based on in-cylinder combustion pressure pulsations. Combustion knock intensity expressed by the maximum peak of the incylinder pressure pulsations shows a strong negative correlation with both the EGR ratio and relative equivalence ratiolambda. With respect to a catalytic converter installed on the exhaust pipe line, applying EGR appears as better solution for knock reduction then leaning the combustible mixture because the catalytic converter needs stoichiometric mixture for effective NO x reduction. Furthermore, application of the over-expanded cycle to the hydrogen or coke gas fueled IC engine significantly reduces intensity of potential knock by 50 % in comparison to Otto cycle for all loads. Additionally, over-expanded cycle contributes to increase in engine thermal efficiency. Summing up, all the presented measures and technologies can be successfully implemented into practice in stationary engines as well as in traction engines, both of them working on either natural gas or gaseous renewable fuels.

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“…The proposed threshold has been tested in a mock-up setup using model-based tools (ETAS INTECRIO) and Simulink, and a similar approach has been applied to pressure sensor signals by [18]. Probabilistic modeling of knock occurrence has also been applied by [19].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Knock Characterization Using Adaptive Filters and Power Estimators

et al. 2020

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We combined adaptive filters associated with power estimators to characterize the knock signal, obtained from a knock sensor, in an internal combustion engine. The filters were implemented using the automotive model-based design methodology, and the resulting software was embedded into hardware for a real-time evaluation of the proposed solution. The knock signals could be qualitatively identified in real-time, and thus have the potential to aid in the management of flexible-fuel engines. This approach has an extensive range of applications within the automotive industry, since it can be implemented within any model-based control strategy. For example, this methodology can be applied in commercial ECUs, currently used in most vehicles for knock detection, by simply eliminating an internal, dedicated, integrated circuit for knock identification, or by serving as a redundancy device (i.e: for safety purposes). Finally, this methodology can identify the knock signal, obtained from a knock sensor, just by using an algorithm implemented in the ECU's processor, which we show is identifiable in real-time.

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Investigation of Combustion Knock Distribution in a Boosted Methane-Gasoline Blended Fueled SI Engine

Cited by 5 publications

References 24 publications

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Knock Reduction Measures in the Gas Fuelled Internal Combustion Engine

Real-Time Knock Characterization Using Adaptive Filters and Power Estimators

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