A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Tormos, Bernardo; Martín, Javier Rodríguez; Carreño, Ricardo; Ramı́rez, Leonardo

doi:10.1016/j.triboint.2018.03.007

Cited by 27 publications

(19 citation statements)

References 49 publications

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“…The friction model calibration, aimed at obtaining an accurate prediction of the brake efficiency, was performed with stationary operating points in the complete engine map both at cold and warm conditions. The methodology is described in Tormos et al 34…”

Section: Model Calibration and Validationmentioning

confidence: 99%

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

Olmeda

Martín

Arnau

et al. 2019

International Journal of Engine Research

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In recent years, the interests on transient operation and real driving emissions have increased because of the global concern about environmental pollution that has led to new emissions regulation and new standard testing cycles. In this framework, it is mandatory to focus the engines research on the transient operation, where a Virtual Engine has been used to perform the global energy balance of a 1.6-L diesel engine during a World harmonized Light vehicles Test Cycle. Thus, the energy repartition of the chemical energy has been described with warmed engine and cold start conditions, analyzing in detail the mechanisms affecting the engine consumption. The first analysis focuses on the “delay” effect affecting the instantaneous energy balance due to the time lag between the in-cylinder processes and pipes: as a main conclusion, it is obtained that it leads to an apparent unbalance than can reach more than 10% of the cumulated fuel energy at the beginning of the cycle, becoming later negligible. Energy split analysis in cold starting World harmonized Light vehicles Test Cycle shows that in this condition the energy accumulation in the block is a key term at the beginning (about 50%) that diminishes its weight until about 10% at the end of the cycle. In warmed conditions, energy accumulation is negligible, but the heat transfer to coolant and oil are higher than in cold starting conditions (21% vs 28%). The lower values of the mean brake efficiency at the beginning of the World harmonized Light vehicles Test Cycle (only about 20%) is affected, especially in cold starting, by the higher mechanical losses due to the higher oil viscosity and the heat rejection from the gases. The friction plays an important role only during the first half of the cycle, with a percentage of about 65% of the total mechanical losses and 10% of the total fuel energy at the end of the World harmonized Light vehicles Test Cycle. However, at the end of the cycle, it does not affect dramatically the mean brake efficiency which is about 31% both in cold starting and warmed World harmonized Light vehicles Test Cycle.

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Section: Model Calibration and Validationmentioning

confidence: 99%

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

Olmeda

Martín

Arnau

et al. 2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The mechanical performance of the engines presents rotational speed and load level dependence. The major contributors to the mechanical losses are the drive devices of the auxiliary systems, which account for 15-25% of the total mechanical losses, and the friction of all the kinematic pairs of the engine, accounting for 45-65% [4]. The latter, in turn, is mainly contributed by the Piston/rings group, accounting for 50-68% of the friction, the crankshaft, amounting to 25-35%, and the camshaft, accounting for 10-20% [5].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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.

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“…The main signs of the impairment of the fuel pump performance are unstable engine operation, interrupted fuel supply, increased leaks in the injection unit of the EFP, slow acceleration of the vehicle due to a violated fuel supply, delayed acceleration of the ICE when the accelerator pedal is activated, uneven fuel supply on the move, as well as related pump failures -increased noise during the pump operation, pops in the dumper [7,8]. All this jointly worsens the performance of the ICE up to its shutdown [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

A study of the output characteristics of electric fuel pumps during artificial fault simulation

Гриценко¹,

Shepelev²,

Burzev³

et al. 2021

FME Transactions

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The electric fuel pump (EFP) is one of the potential sources of fuel system failures. According to various data, the fuel system accounts for 25...50% of all failures. The most common reason for the impairment of the fuel system performance and, in particular, the failure of the fuel pump is the contamination of fuel with large or small particles, as well as the wear of the structural elements of the EFP. The purpose of the study is to determine the technical condition of electric fuel pumps of motor vehicle engines based on the use of testing technologies. The paper discusses theoretical and experimental studies of the fuel system of motor vehicle engines: the change in the current consumption rate of the EFP depending on the degree of contamination of series elements in the system and leaks in the injection unit of the EFP.

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A general model to evaluate mechanical losses and auxiliary energy consumption in reciprocating internal combustion engines

Cited by 27 publications

References 49 publications

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

Analysis of the energy balance during World harmonized Light vehicles Test Cycle in warmed and cold conditions using a Virtual Engine

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

A study of the output characteristics of electric fuel pumps during artificial fault simulation

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