Fuel Property Effects on Oil Dilution in Diesel Engines

Wattrus, Mark

doi:10.4271/2013-01-2680

Cited by 29 publications

(32 citation statements)

References 10 publications

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“…28 The addition of bioethanol to gasoline enhances the tendency of the fuel to reach the crankcase of engine oil due to its higher heat of vaporization, thus increasing the rate of fuel dilution. 11,29 Signicant amounts of diluted ethanol fuel, in particular, E85 (between 6% and 25%) have been found in the engine oil crankcase aer eld tests 12 and bench sequence tests. 11,30 A study of fuel dilution was done by T. Hu et al 31 They explained that turbocharged gasoline direct-injection (TGDI) engine operated at high torque had a signicant inuence on fuel dilution (gasoline) which was found to be up to 9%.…”

Section: Literature Reviewmentioning

confidence: 92%

Effect of gasoline–bioethanol blends on the properties and lubrication characteristics of commercial engine oil

et al. 2017

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Section: Literature Reviewmentioning

confidence: 92%

Effect of gasoline–bioethanol blends on the properties and lubrication characteristics of commercial engine oil

et al. 2017

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“…Therefore, the amount of fuel ending up on the cylinder walls is higher. 10,11,12 2. The volatility of the fuel fraction in the engine oil may affect the vaporization process, decreasing the amount of fuel in the engine oil.…”

Section: Introductionmentioning

confidence: 99%

“…The higher the distillation temperature, the slower the process and the more the oil remains diluted. 9,10 Andreae et al 9 concluded that oil dilution is related to the higher distillation temperatures of FAME. Wattrus 10 observed that back-end volatility showed no correlation with oil dilution; however, the front-end volatility (E270 distillation point) showed a good correlation with oil dilution.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 Andreae et al 9 concluded that oil dilution is related to the higher distillation temperatures of FAME. Wattrus 10 observed that back-end volatility showed no correlation with oil dilution; however, the front-end volatility (E270 distillation point) showed a good correlation with oil dilution. Spray characteristic studies of FAME considering post-injection could not be found, although in few studies spray characteristics are related to fuel properties.…”

Section: Introductionmentioning

confidence: 99%

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Late post-injection of biofuel blends in an optical diesel engine: Experimental and theoretical discussion on the inevitable wall-wetting effects on oil dilution

Hulkkonen

Tilli

Kaario

et al. 2016

International Journal of Engine Research

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In a diesel engine, diesel particulate filter is used to reduce particle matter emissions. Diesel particulate filter requires periodic regenerations under high-temperature conditions in the exhaust pipe in order to oxidize the accumulated soot. A common strategy to produce high exhaust gas temperature is to inject late post-injections after the main injection. However, this practice may dilute the engine oil, causing engine wear. Biofuel addition to petroleum diesel may increase oil dilution even more. This is related to the fuel spray characteristics, the post-injection control and the vaporization process of fuel in engine oil. In this study, spray properties of late post-injection were studied with petroleum diesel and two types of transport biofuel blends containing 30% either fatty acid methyl ester or hydro-treated vegetable oil. Three different late post-injection timings were investigated. Image sequences of the main spray flame as well as the noncombusting late post-injection spray were extracted. In order to verify oil dilution during regeneration cycle and late post-injection, oil samples from six-cylinder test engine were analyzed. According to the present experiments, differences in the spray characteristics are not significant with the tested fuels. However, higher oil dilution rates were observed with fuel blend composed of 30% fatty acid methyl ester. All the studied late post-injection timings were noted to lead to the unwanted cylinder spray/wall interaction and wall-wetting consequently diluting the engine oil. The spray/ wall interaction is thoroughly explained by introducing a theoretical/computational framework which characterizes any spray/wall interaction in terms of a phase diagram for any considered operation conditions. The novelty of this study arises from (1) first comparison of fatty acid methyl ester and hydro-treated vegetable oil blends in an optical engine, (2) strong evidence on the phenomena related to post-injection phase in six-cylinder and single-cylinder optical engine configurations and (3) the development of a single-droplet model showing inevitable wall-wetting.

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“…One of the issues that have to be considered in developing TGDI engines is fuel dilution of the engine crankcase oil (for short, fuel dilution) [6,7,8,9]. Fuel dilution is encountered in all direct-injection diesel and gasoline engines [6,7,8,9,10,11,12]. It is due commonly to cylinder wall wetting caused by one of following two mechanisms: condensation of the fuel vapor on the cylinder wall or dispersed liquid fuel drops in contact with the cylinder wall.…”

Section: Introductionmentioning

confidence: 99%

Impact of Fuel Injection on Dilution of Engine Crankcase Oil for Turbocharged Gasoline Direct-Injection Engines

Teng

Luo

et al. 2015

SAE Int. J. Engines

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Turbocharged gasoline direct injection (TGDI) engines often have a flat torque curve with the maximum torque covering a wide range of engine speeds. Increasing the high-speed-end torque for a TGDI engine provides better acceleration performance to the vehicle powered by the engine. However, it also requires more fuel deliveries and thus longer injection durations at high engine speeds, for which the multiple fuel injections per cycle may not be possible. In this study, results are reported of an experimental investigation of impact of fuel injection on dilution of the crankcase oil for a highly-boosted TGDI engine. It was found in the tests that the high-speedend torque for the TGDI engine had a significant influence on fuel dilution: longer injection durations resulted in impingement of large liquid fuel drops on the piston top, leading to a considerable level of fuel dilution. Test results indicated that the higher the torque at the rated-power, the greater the level of fuel dilution. In a cyclic-load engine test simulating the customer drives of a target vehicle powered by the engine, the maximum level for fuel dilution was found to be up to 9%, causing significant drop in the oil viscosity. The causes for fuel dilution and impacts of it on the oil consumption and formation of carbon deports on the piston ring area, and methods for mitigating impacts of fuel dilution are discussed in the paper.

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Fuel Property Effects on Oil Dilution in Diesel Engines

Cited by 29 publications

References 10 publications

Effect of gasoline–bioethanol blends on the properties and lubrication characteristics of commercial engine oil

Effect of gasoline–bioethanol blends on the properties and lubrication characteristics of commercial engine oil

Late post-injection of biofuel blends in an optical diesel engine: Experimental and theoretical discussion on the inevitable wall-wetting effects on oil dilution

Impact of Fuel Injection on Dilution of Engine Crankcase Oil for Turbocharged Gasoline Direct-Injection Engines

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