A methodology to estimate mechanical losses and its distribution during a real driving cycle

Tormos, Bernardo; Martín, Javier Rodríguez; Plá, Benjamín; Jiménez-Reyes, Antonio J.

doi:10.1016/j.triboint.2020.106208

Cited by 8 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using this method, the pumping losses and the losses contributed by the friction and auxiliary contribution can be determined, as expressed in equation (7). The effective performance parameters were supplemented with the specific fuel consumption and the net engine efficiency calculations using equations ( 8) and (9). where e  : net engine efficiency, fuel Q : heat fuel flow, and LHV : lower heat value.…”

Section: Mechanical Losses Calculationmentioning

confidence: 99%

“…In addition, the pumping in the intake and exhaust phases contributes 15-30% of the total mechanical losses for diesel engines [4] and up to 50% for gasoline engines [5]. By reducing mechanical losses, it is possible to improve engine performance, reduce fuel consumption and CO2 emissions, extend durability, and thus, reduce operating costs [2], [6]─ [9]. However, evaluating the techniques for reducing losses, such as development of lubricants with better tribological properties and friction modifiers, surface treatments with better finish, and engine downsizing, requires experimental tests, even when numerical methodologies are used [4], [7], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

“…Numerical study of the mechanical losses is a cost-effective alternative, which makes it possible to predict the losses by empirical correlations based on engine operating characteristics, such as the crankshaft speed, average piston speed, pressure in the intake duct, maximum in-cylinder pressure, and main engine measures [14], [20]- [22]. In addition, numerical studies involve mathematical modelling based on the engine dynamics, kinematics, and tribological behaviour [4], [9], [11], [20], [21], [25] or application of black box models trained only with experimental data [10]. It should be clarified that the calibration of a model is subject to the particular characteristics of the engine.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study of mechanical losses of single-cylinder spark-ignited engine

2021

View full text Add to dashboard Cite

In this study, the mechanical losses of a single-cylinder spark-ignited Robin EY15 engine were experimentally determined and analysed by the indicated method. The effects of the load and speed on the mechanical loss balance were also analysed. The tests were conducted on a test bench equipped with a DC motor generator at speeds between 1500 and 4800 min -1 and three load levels of 25, 50, and 100%. The results showed that the mechanical efficiency ranges between 22.5% and 83.2% for the tested engine and the evaluated operation points, attaining the highest efficiency under the full load and 2100 min -1 . However, at this load level, the efficiency is reduced to 29% with the increase in the rotation speed. Concurrently, the pumping losses contribute up to 58.7% of the total losses, which indicates that their contribution is even higher than the sum of the other components under low load conditions. However, as the load increases, this contribution decreases to 18% for lower rotation regimes. In addition, the experimental results of the total mechanical losses were compared with some numerical correlations found in the literature. Finally, some empirical correlations were proposed for the mechanical efficiency calculation of the tested engine.

show abstract

Section: Mechanical Losses Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of mechanical losses of single-cylinder spark-ignited engine

2021

View full text Add to dashboard Cite

show abstract

“…Investigations into the operation of the piston ring pack have garnered the attention of many scientists due to their significance in determining the mechanical efficiency, wear, fuel economy, and exhaust emissions of an IC engine. The PRC system has a huge share in engine frictional losses-about 30-65% [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Frictional Losses of Ring Pack in SI and HCCI Engine

Koszalka,

Wolff

2023

Energies

View full text Add to dashboard Cite

The vast majority of research dedicated to enhancing the homogenous charge compression ignition (HCCI) low-temperature combustion system is focused on improving controllability, efficiency and emissions. This article aims to assess the impact of HCCI combustion on the operation of the piston ring system. Utilizing the measured pressures in the combustion chamber of a single-cylinder research engine operating in spark ignition (SI) and HCCI modes at various loads, simulations were carried out using an advanced ring pack model. This model integrates the gas flow, ring dynamics and ring mixed lubrication models. Simulations revealed that differences in the pressure above the piston between the HCCI and SI combustion significantly influence ring pack performance. The predicted energy losses due to the friction of piston rings against the cylinder liner are up to 5% higher in the HCCI engine than in the SI engine. This identified drawback diminishes the advantages of the HCCI engine resulting from higher thermal efficiency, and efforts should be made to minimize this negative impact.

show abstract

Comparative study of energy losses related to the ring pack operation in homogeneous charge compression ignition and spark ignition combustion

Koszałka

Hunicz

2021

Energy

View full text Add to dashboard Cite

A methodology to estimate mechanical losses and its distribution during a real driving cycle

Cited by 8 publications

References 23 publications

Experimental study of mechanical losses of single-cylinder spark-ignited engine

Experimental study of mechanical losses of single-cylinder spark-ignited engine

Frictional Losses of Ring Pack in SI and HCCI Engine

Comparative study of energy losses related to the ring pack operation in homogeneous charge compression ignition and spark ignition combustion

Contact Info

Product

Resources

About