The Friction Behavior of Individual Components of a Spark-Ignition Engine During Warm-Up

Daniels, Christopher C.; Braun, M. J.

doi:10.1080/05698190500544403

Cited by 25 publications

(15 citation statements)

References 7 publications

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“…1 The cold engine operation in early phases of any driving cycle is characterised by higher frictional losses, ineffective combustion, increased fuel consumption and exhaust emissions. 2 Most of the harmful substances ( ' 60%-65%) are produced in the course of the thermal engine stabilisation which takes place during initial phases of driving. 3 Wang and Stone 4 showed that the cylinder wall temperature is a significant parameter influencing HC and NO x emissions from internal combustion (IC) engines.…”

Section: Introductionmentioning

confidence: 99%

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Wolak

Zając

2018

Advances in Mechanical Engineering

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This article assesses the performance and reduction level of five engine oils available from various manufacturers. The trend and intensity of the cranking viscosity changes as measured in the cold cranking simulator were thoroughly analysed. In the presented experiment, alterations in engine oils appearing during actual operation were noted. The tests were conducted under conditions which can be depicted as 'harsh', that is, multiplied starting of the engine, extended engine idling and short stretch driving. All of the engine oil samples were collected from passenger cars of a homogeneous fleet of 25 vehicles. The dynamic (cranking) viscosity was determined according to the ASTM D5293-15. In all analysed cases, there was a dangerously rapid increase (36%-69%) in the cranking viscosity, and the limit values (7000 mPaÁs) were reached very quickly (for the mileages in the range of 3000-13,000 km). The obtained results have led to the development of a statistical model, allowing vehicle users/drivers to choose a better engine oil in winter, thus improving the engine's ability to cold start and protecting it from excessive wear or damage. The test results may help to predict the performance of the engine oil during operation, its service life and an oil-change interval.

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Section: Introductionmentioning

confidence: 99%

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Wolak

Zając

2018

Advances in Mechanical Engineering

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“…Worldwide transportation of humans and goods consumes 20% of global primary energy; road vehicles account for 72% of this energy consumption [1]. Hydrodynamic friction-based energy losses are also particularly high during the engine warm-up period [2,3], especially at cold engine start-up because of high lubricant viscosities at low engine temperatures. Moreover, most vehicles operate at a temperature lower than the designed value because the length of intra-city journey is not sufficient to increase engine temperature to hot working conditions [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…A plain bearing is a crucial tribological component in IC engines; it contributes to increasing energy losses at cold temperatures [3]. Surface grooves in an interface improve the tribological performance in a number of engineering applications [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Conjunction of Textured Journal Surface—Bearing for Improved Frictional Response during Warm-Up of an Internal Combustion Engine

2018

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Considerable prime global energy is used in the transport sector. Significant energy is lost to overcome the internal friction of engines in transport vehicles. Journal bearings are crucial tribo-pairs and passive components that cause energy loss. Frictional losses increase extensively during the warm-up period of an engine due to high lubricant viscosity. Recent tribological developments have shown that surface textures can be a potential solution to reduce friction. A numerical investigation is performed to evaluate the effect of surface texture on the frictional and lubrication performance of a journal bearing at varying thermal operating conditions in an internal combustion engine. Temperature variations during engine warm-up are considered with oil rheology to observe texture-based improvements. Surface texture substantially reduces frictional energy loss during engine warm-up. Eight different monograde and multigrade engine oils are considered, and consistency is observed in texture-based improved outcomes.

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“…This is mainly due to higher engine internal frictional losses [6], ineffective combustion, and the low efficiency of catalytic converters [7].…”

Section: Introductionmentioning

confidence: 99%

Improving Engine Oil Warm Up through Waste Heat Recovery

Battista

Cipollone

2017

Energies

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Abstract:In the transportation sector, engine oil thermal management has not yet received the attention it deserves in the path towards carbon dioxide and pollutants reduction. During the homologation cycle (which represents a typical daily trip), oil temperature reaches its thermal steady value, which insures best performances in terms of viscosity, only in the final part of the trip, when most part of the harmful emissions have been already emitted; therefore, a warm up acceleration would surely represent a strong beneficial action. In this paper, a faster warming up of the lubricant oil was done using the heat owned by the exhaust gases, which was almost immediately ready after the engine ignition, in the early part of a driving cycle. An experimental activity has been developed in a turbocharged engine (F1C 3L IVECO), modifying the oil circuit in order to heat up the oil during the cold phase of a homologation cycle by the exhaust gases. A significant reduction of fuel consumption and pollutant emissions savings has been experimentally demonstrated. Also, the interaction between the modified oil circuit, engine, coolant circuit, and exhaust line has been investigated in order to have a system view of the new heating oil technology.

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The Friction Behavior of Individual Components of a Spark-Ignition Engine During Warm-Up

Cited by 25 publications

References 7 publications

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Cold cranking viscosity of used synthetic oils originating from vehicles operated under similar driving conditions

Hydrodynamic Conjunction of Textured Journal Surface—Bearing for Improved Frictional Response during Warm-Up of an Internal Combustion Engine

Improving Engine Oil Warm Up through Waste Heat Recovery

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