Turbocharger motor-generator for improvement of transient performance in an internal combustion engine

Panting, J R; Pullen, Keith; Martinez-Botas, Ricardo

doi:10.1243/0954407011525700

Cited by 27 publications

(15 citation statements)

References 3 publications

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“…[72][73][74][75][76][77][78][79][80][81][82][83] approach have been developed. The studies have concentrated on interesting issues such as effect of VGT [84][85][86], turbocharger match [87], thermal shock in engine structures [88], governor operation [89,90], exhaust emissions [91][92][93][94][95][96][97][98][99], vehicle cooling system [100], effect of compressor surging [101][102][103][104][105][106][107], electrically assisted turbocharging [108][109][110][111], vehicle performance [112][113][114][115][116], variable valve timing [117], sequential turbocharging [118] and marine diesel engine applications …”

Section: Historical Overviewmentioning

confidence: 99%

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Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Rakopoulos¹,

Giakoumis²

2006

SAE Technical Paper Series

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Study and modeling of transient operation is an important scientific objective. This is due to the fact that the majority of daily vehicle driving conditions involve transient operation, with non-linear situations experienced during engine transients. Thus, proper interconnection is needed between engine, governor, fuel pump, turbocharger and load. This paper surveys the publications available in the open literature concerning diesel engine simulations under transient operating conditions. Only those models that include both full engine thermodynamic calculations and dynamic powertrain modeling are taken into account, excluding those that focus on control design and optimization. Most of the attention is concentrated to the simulations that follow the filling and emptying modeling approach. A historical overview is given covering, in more detail, research groups with continuous and consistent study of transient operation. One of the main purposes of this paper is to summarize basic equations and modeling aspects concerning in-cylinder calculations, friction, turbocharger, engine dynamics, governor, fuel pump operation, and exhaust emissions during transients. The various limitations of the models are discussed together with the main aspects of transient operation (e.g. turbocharger lag, combustion and friction deterioration), which diversify it from the steady-state. Some of the most important findings in the field during the last 30 years are presented and discussed. The survey extends to special cases of transient diesel engine simulation, such as second-law analysis, response when the turbocharger compressor experiences surge, and whole vehicle performance. Several methods of improving transient response are also mentioned, based on the various simulations. An easy-to-read tabulation of all research groups dealing with the subject, that includes details about each model developed and engines/parameters studied, is also provided at the end of the paper.

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Section: Historical Overviewmentioning

confidence: 99%

“…Panting et al [109] investigated theoretically the improvement in transient performance of a four-cylinder turbocharged diesel engine using a motor-generator of varying power. The results were encouraging and most beneficial the greater the power of the motor-generator.…”

Section: Ways Of Improving Responsementioning

confidence: 99%

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Rakopoulos¹,

Giakoumis²

2006

SAE Technical Paper Series

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“…This is achieved through either increased availability of combustion air or a reduction in pre-turbine back pressure. In specific engine operating regions, the fuel economy benefit of using an electrified turbocharger is up to 10% [6]. Compared with feeding energy to the crankshaft, the electrified turbocharger is more efficient in improving fuel efficiency for the mechanical losses are reduced [7].…”

Section: Introductionmentioning

confidence: 99%

Characterisation, control, and energy management of electrified turbocharged diesel engines

Zhao

Winward

Yang

et al. 2017

Energy Conversion and Management

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The electrification of engine components offers significant opportunities for fuel efficiency improvements. The electrified turbocharger is one of the most attractive options since it recovers part of the engine exhaust gas mechanical energy to assist boosting. Therefore, the engine can be downsized through improved transient responsiveness. In the electrified turbocharger, an electric machine is mounted on the turbine shaft and changes the air system dynamics, so characterisation of the new layout is essential. A systematic control solution is required to manage energy flows in the hybrid system. In this paper, a framework for characterisation, control, and energy management for an electrified turbocharged diesel engine is proposed. The impacts of the electric machine on fuel economy and air system variables are analysed. Based on the characterisation, a two-level control structure is proposed. A real-time energy management strategy is employed as the supervisory level controller to generate the optimal values of critical variables, while a model-based multi-variable controller is designed as the low level controller to track the values. The two controllers work together in a cascade to address both fuel economy optimisation and battery state-of-charge maintenance. The proposed control strategy is validated on a high fidelity physical engine model. The tracking performance shows the proposed framework is a promising solution in regulating the behavior of electrified engines. Electrified turbocharged diesel engines, energy management, real-time optimisation, multi-variable control 2 Highlights• A real-time energy management framework for electrified engines is proposed.• A multi-variable robust controller is designed.• Characterisation on the air system of electrified diesel engines is given.• Reliable for engine downsizing because of the promising transient performance.

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“…Enhancement of efficiency of turbo machine is the most common proposal. Higher turbocharger efficiency lefts more energy for power turbine and high efficiency power turbine can make better use of the energy in the exhaust flow with less penalty on engine power [16,17]. The research conducted by D.T.…”

Section: Introductionmentioning

confidence: 99%

Fuel Saving Potential of Different Turbo-Compounding Systems Under Steady and Driving Cycles

Xie

2015

SAE Technical Paper Series

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The performance of three different electric turbo-compounding systems under both steady and driving cycle condition is investigated in this paper. Three configurations studied in this paper are serial turbo-compounding, parallel turbo-compounding and electric assisted turbo-compounding. The electric power, global gain of the whole system (engine and power turbine) under steady operating condition is firstly studied. Then investigation under three different driving cycles is conducted. Items including fuel consumption, engine operating point distribution and transient response performance are analyzed among which the second item is done based on statistic method combined with the results obtained under steady operating conditions. Study under steady condition indicates that electric assisted turbo-compounding system is the best choice compared with the other two systems. The performance of serial turbo-compounding is load oriented while parallel configuration is speed oriented. Research under driving cycles shows that performance differs greatly according to driving cycles considered for the same turbocompounding system though all the turbo-compounding systems is capable of enhancing the fuel economy. Electric assisted turbocompounding is still the best no matter what driving cycle is considered. Serial system shows much better performance than parallel configuration because more operating points falls in the region corresponding to significant improvement of overall fuel conversion efficiency (including the power recovered by power turbine). What is more, the electric assisted turbo-compounding system shows much better transient response performance than the other two systems. Serial configuration is more suitable for the driving cycle characterized by frequent vehicle speed change compared with parallel layout.Pumping loss is the main factor considered when different forms of turbo-compounding system are compared for a given engine. Additional turbine mounted in the exhaust pipe acts like an obstacle

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Turbocharger motor-generator for improvement of transient performance in an internal combustion engine

Cited by 27 publications

References 3 publications

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions

Characterisation, control, and energy management of electrified turbocharged diesel engines

Fuel Saving Potential of Different Turbo-Compounding Systems Under Steady and Driving Cycles

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