Solution strategy for increasing the efficiency of turbochargers by reducing energy losses in the lubrication system

Novotný, Pavel; Vacula, Jiří; Hrabovský, Jozef

doi:10.1016/j.energy.2021.121402

Cited by 11 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model developed calculates the equilibrium of the turbocharger, varying the rack positioning, in order to comply to the boost pressure and intake air mass flow rate requirement of the engine, in a specific working point (torque-rotational speed), as in the system of equations (1). Mechanical efficiency of the turboshaft ηm is considered equal to 1, for the sake of simplicity of this study and considering that the mechanical efficiency of turbochargers for vehicles engines is usually very high, with values above 90% and also higher, if proper lubrication is granted [43].…”

Section: Turbocharger Modelingmentioning

confidence: 99%

Turbocompound energy recovery option on a turbocharged diesel engine

Battista,

Bartolomeo,

Prospero

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The transportation sector is living a transition era in which hybrid and electrified vehicles are replacing conventional vehicles, based on internal combustion engines. This is pushed by the recognized need for reducing fuel consumption and tailpipe emissions, considering primary pollutants and carbon dioxide as a greenhouse gas. In the transition path, hybridization and partial electrification of the powertrain play a crucial role. In this regard, the need for on-board electrical energy storage and utilization is increasing significantly and the possibility to recover wasted energy and convert it into electrical form is mandatory. This is especially true for commercial and heavy-duty vehicles, where full electrification is more difficult to be implemented. Waste Heat Recovery (WHR) has therefore become so important for vehicles, not only to directly reduce fuel consumption and related emissions but also to improve the feasibility of a generation of vehicles with a higher degree of hybridization that considers, for example, the electrification of auxiliaries following the so-called auxiliaries-on-demand management. Wasted heat refers mainly to exhaust heat from gases, where about one third of the fuel energy is disposed of. Among the various systems for WHR, engine turbo-compounding is approaching a mature technology. This technological option makes use of an additional turbine on the exhaust line of the engine, downstream of the turbocharging one, which converts the residual gas enthalpy into mechanical form. In this paper, the F1C Iveco 3.0 L turbocharged diesel engine is considered for verifying the performances of a turbo-compounding system. The engine was mounted on a dynamic engine test bench. In particular, the interactions with the original engine produced on the exhaust line were studied. Backpressure effects on the engine introduced by turbo-compounding were evaluated reversed in terms of extra fuel consumption. Moreover, the new equilibrium of the turbocharger was assessed and the related modifications to the engine were measured considering that the turbocharger has a control strategy based on the so-called Variable Geometry Turbine (VGT), via the modification of the Inlet Guide Vanes (IGV). The presence of a secondary turbine for WHR opens to a wider possibility of actuating the IGV and, so, the possibility to optimize the recovery considering the integrated system and all its degrees of freedom.

show abstract

Section: Turbocharger Modelingmentioning

confidence: 99%

Turbocompound energy recovery option on a turbocharged diesel engine

Battista,

Bartolomeo,

Prospero

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…For traditional engines, many researchers are focused on reducing mechanical losses to enhance energy conversion efficiency. This includes improving lubrication systems, minimizing friction losses, and other related measures [1][2][3][4]. Since the 1980s, researchers have integrated mechanical and hydraulic systems into the design of hydraulic free-piston engines, which apply modern hydraulic technology, microelectronic control technology, and relevant theories of internal combustion engines, and have received widespread attention [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal–Mechanical–Hydraulic Coordination Mechanism of a Constrained Piston Hydraulic Engine

Bai

Zhang

et al. 2023

Sustainability

View full text Add to dashboard Cite

By effectively integrating traditional engines with reciprocating plunger pumps, the constrained piston hydraulic engine can simultaneously output hydraulic energy and rotational mechanical energy, which effectively solves the problems of the complex structure, long power transmission chain, and low energy conversion efficiency of traditional power sources. Based on a certain single-cylinder diesel engine, a single-cylinder axial constrained piston hydraulic engine was designed, and its thermal–mechanical–liquid coordination mechanism was studied and analyzed in-depth. A mathematical model of the thermal–mechanical–liquid coupling working process of the single-cylinder axial hydraulic engine was established, and the conversion mechanism and output of the three types of energy, thermal, mechanical, and liquid, were simulated and analyzed. The results show that under the premise of improving the overall efficiency, the constrained piston hydraulic engine can effectively output mechanical–hydraulic dual-element power, and its combustion characteristics and output power performance indicators meet the expected design requirements. The maximum amplitude difference of the output hydraulic oil flow rate reaches 248 L/min, and the flow rate fluctuates greatly, so it is necessary to adopt methods to suppress the flow rate pulsation to ensure the reliability of the output flow rate.

show abstract

“…The mechanical efficiency of TCRs is mainly influenced by the lubrication system; therefore, to reduce the loss of performance, Novotný et al [24] developed a strategy allowing an increase in the performance of the TCR lubrication system. This strategy will be used by the authors to develop a new design of the TCR thrust bearing to reduce mechanical losses in the lubrication system.…”

Section: Introductionmentioning

confidence: 99%

Studying the Temperature Characteristics of Oil at the Outlet From the K27-145 Turbocharger Rotor Bearing

Гриценко¹,

Shepelev²,

Kaliyev³

2022

Tribol. Ind.

View full text Add to dashboard Cite

Turbocharging is a promising solution for increasing the specific power of motor-and-tractor equipment, which allows increasing power up to 50%. At the same time, a significant growth of speed, load, and temperature modes leads to a significant increase in the number of failures and a decrease in reliability by 2-3 times. Theoretical and experimental studies established that the temperature of the bearing and oil at the turbocharger drain changes under the influence of the inlet oil temperature to the TCR bearing, the TCR rotor shaft speed, and the change in the oil pressure at the input to the TCR bearing. This allows setting the limits of the TCR bearing performance in extreme operating conditions. The installation of an autonomous TCR lubricating and braking device maintains the required reliability level and increases failure-free operation. The hydraulic accumulator installed in the lubrication system of the engine turbocharger regulars lubricates and cools the rotor bearings when the ICE crankshaft speed drops. The incorporation of a braking device reduces the rundown time of the rotor and thereby prevents oil starvation and dry friction of the rotor bearing. The combined use of the hydraulic accumulator and the braking device minimizes the risk of dry friction and accidental failure of the turbocharger. We proved that the braking device of the TCR rotor built into the intake system of an ICE with the calculated design parameters reduces the rotor rundown time by 30-35%. This reduces the dimensions and operating time of the hydraulic accumulator and simultaneously eliminates surges in the compressor section of the TCR and any breakage of its parts. In these conditions, it is relevant to develop independent systems to lubricate the TCR bearings and replenish them using built-in hydraulic accumulators during start-up, significant loads at minimum crankshaft speeds, and engine stalling.

show abstract

Solution strategy for increasing the efficiency of turbochargers by reducing energy losses in the lubrication system

Cited by 11 publications

References 27 publications

Turbocompound energy recovery option on a turbocharged diesel engine

Turbocompound energy recovery option on a turbocharged diesel engine

Analysis of the Thermal–Mechanical–Hydraulic Coordination Mechanism of a Constrained Piston Hydraulic Engine

Studying the Temperature Characteristics of Oil at the Outlet From the K27-145 Turbocharger Rotor Bearing

Contact Info

Product

Resources

About