Improving Misfire Diagnostic Through Coupled Engine/Vehicle Numerical Simulation

Millo, Federico; Mallamo, Fabio; Digiovanni, R.; Dominici, A.; Morel, Thomas; Okarmus, Marcin

doi:10.4271/2004-01-0613

Cited by 4 publications

(6 citation statements)

References 7 publications

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“…As the first step, the steady-state performances of the baseline naturally aspirated engine were delineated. The authors employed the experimental data reported in [24], which were obtained on a gasoline VVT SI engine. Considering the application of the analyzed propulsion system to a plausible European Type C-Medium hybrid vehicle, the performances reported in [24] were adapted to a mid-level passenger car engine using a normalization procedure.…”

Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

“…The authors employed the experimental data reported in [24], which were obtained on a gasoline VVT SI engine. Considering the application of the analyzed propulsion system to a plausible European Type C-Medium hybrid vehicle, the performances reported in [24] were adapted to a mid-level passenger car engine using a normalization procedure. For that purpose, the normalized mean piston speed u was employed:…”

Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

“…this is equivalent to assuming that the different engines share the same technology level, hence the same mechanical performance. With values obtained for thermal efficiencies, the volumetric CR reported in [24] was assumed for the baseline engine. The value of 1.11 was assumed for the stroke-to-bore ratio for each engine model presented in this paper, as is the average and typical value adopted on current engines employed in hybrid propulsion vehicles.…”

Section: ) Volumetric Efficiency (λV)mentioning

confidence: 99%

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The Potential of a Separated Electric Compound Spark-Ignition Engine for Hybrid Vehicle Application

Pipitone

Caltabellotta

2022

Journal of Engineering for Gas Turbines and Power

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In-cylinder expansion of internal combustion engines based on Diesel or Otto cycles cannot be completely brought down to ambient pressure, causing a 20% theoretical energy loss. Several systems have been implemented to recover and use this energy such as turbocharging, turbo-mechanical and turbo-electrical compounding, or the implementation of Miller Cycles. In all these cases however, the amount of energy recovered is limited allowing the engine to reach an overall efficiency incremental improvement between 4% and 9%. Implementing an adequately designed expander-generator unit could efficiently recover the unexpanded exhaust gas energy and improve efficiency. In this work, the application of the expander-generator unit to a hybrid propulsion vehicle is considered, where the onboard energy storage receives power produced by an expander-generator, which could hence be employed for vehicle propulsion through an electric drivetrain. Starting from these considerations, a simple but effective modelling approach is used to evaluate the energetic potential of a spark-ignition engine electrically supercharged and equipped with an exhaust gas expander connected to an electric generator. The overall efficiency was compared to a reference turbocharged engine within a hybrid vehicle architecture. It was found that, if adequately recovered, the unexpanded gas energy could reduce engine fuel consumption and related pollutant emissions by 4% to 12%, depending on overall power output.

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Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

Section: ) Volumetric Efficiency (λV)mentioning

confidence: 99%

See 1 more Smart Citation

The Potential of a Separated Electric Compound Spark-Ignition Engine for Hybrid Vehicle Application

Pipitone

Caltabellotta

2022

Journal of Engineering for Gas Turbines and Power

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“…Starting from the characteristics and the specific performances of this common baseline naturally aspirated engine, the performances of both the separated electric turbo-compound unit and the reference turbocharged engine were obtained. For the development of the baseline naturally aspirated engine model, the authors employed the experimental data of the gasoline VVT spark ignition engine reported in [23]. The system analyzed in the present paper was conceived for a European Type C-Medium hybrid vehicle, which is why the engine performances reported in [23] were remodeled and adapted to a mid-level passenger car engine through a normalization process.…”

Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

“…For the development of the baseline naturally aspirated engine model, the authors employed the experimental data of the gasoline VVT spark ignition engine reported in [23]. The system analyzed in the present paper was conceived for a European Type C-Medium hybrid vehicle, which is why the engine performances reported in [23] were remodeled and adapted to a mid-level passenger car engine through a normalization process. For this purpose, the normalized mean piston speed u was employed:…”

Section: Baseline Naturally Aspirated Enginementioning

confidence: 99%

Efficiency Advantages of the Separated Electric Compound Propulsion System for CNG Hybrid Vehicles

Pipitone

Caltabellotta

2021

Energies

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As is widely known, internal combustion engines are not able to complete the expansion process of the gas inside the cylinder, causing theoretical energy losses in the order of 20%. Several systems and methods have been proposed and implemented to recover the unexpanded gas energy, such as turbocharging, which partially exploits this energy to compress the fresh intake charge, or turbo-mechanical and turbo-electrical compounding, where the amount of unexpanded gas energy not used by the compressor is dedicated to propulsion or is transformed into electric energy. In all of these cases, however, maximum efficiency improvements between 4% and 9% have been achieved. In this work, the authors deal with an alternative propulsion system composed of a CNG-fueled spark ignition engine equipped with a turbine-generator specifically dedicated to unexpanded exhaust gas energy recovery and with a separated electrically driven turbocompressor. The system was conceived specifically for hybrid propulsion architectures, with the electric energy produced by the turbine generator being easily storable in the on-board energy storage system and re-usable for vehicle traction. The proposed separated electric turbo-compound system has not been studied in the scientific literature, nor have its benefits ever been analyzed. In this paper, the performances of the analyzed turbo-compound system are evaluated and compared with a traditional reference turbocharged engine from a hybrid application perspective. It is demonstrated that separated electric compounding has great potential, with promising overall efficiency advantages: fuel consumption reductions of up to 15% are estimated for the same power output level.

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Misfire detection based on engine speed using wavelet

Liu

Yang

et al. 2009

2009 IEEE Intelligent Vehicles Symposium

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Improving Misfire Diagnostic Through Coupled Engine/Vehicle Numerical Simulation

Cited by 4 publications

References 7 publications

The Potential of a Separated Electric Compound Spark-Ignition Engine for Hybrid Vehicle Application

The Potential of a Separated Electric Compound Spark-Ignition Engine for Hybrid Vehicle Application

Efficiency Advantages of the Separated Electric Compound Propulsion System for CNG Hybrid Vehicles

Misfire detection based on engine speed using wavelet

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