Boosting and Direct Injection -Synergies for Future Gasoline Engines

Lang, Oliver; Geiger, José; Habermann, Knut; Wittler, Michael

doi:10.4271/2005-01-1144

Cited by 37 publications

(10 citation statements)

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“…However, even under such conditions, in an engine of high energy inhalation rate it is usually still necessary to reduce the geometric compression ratio to avoid knock. As a result, in recent years various workers have investigated the synergy between downsizing and direct fuel injection, the charge cooling effects of which facilitate increased compression ratio and improved thermal efficiency (8)(9)(10)(11)(12). However, such injection systems are not without their own challenges, including maintaining robust pollutant emissions control.…”

Section: Introductionmentioning

confidence: 98%

Exhaust gas recirculation boosted direct injection gasoline engines

Cairns

Blaxill

Fraser

2010

Advanced Direct Injection Combustion Engine Technologies and Development

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Section: Introductionmentioning

confidence: 98%

Exhaust gas recirculation boosted direct injection gasoline engines

Cairns

Blaxill

Fraser

2010

Advanced Direct Injection Combustion Engine Technologies and Development

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“…Turbocharged Gasoline Direct Injection (TGDI) has been recognized as a promising technology for improving fuel economy for gasoline engines [1,2,3,4,5]. 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].…”

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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“…6,7 For the same engine torque, a downsized engine has lower throttling losses than a larger displacement naturally aspirated engine, thereby providing higher part-load efficiency. 8–11…”

Section: Introductionmentioning

confidence: 99%

Optimizing split fuel injection strategies to avoid pre-ignition and super-knock in turbocharged engines

Singh

Morganti

Dibble

2019

International Journal of Engine Research

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Fuel injection strategies often have a considerable impact on pre-ignition in high specific output gasoline engines. Splitting the injection event into two or more pulses has been widely explored as one means of reducing pre-ignition. As effective as these strategies can be with respect to pre-ignition suppression, they often introduce other compromises into the combustion process, for example, reduced indicated mean effective pressure or greater cycle-to-cycle variation. This study examines a split injection strategy with up to three injection pulses for suppressing pre-ignition, while optimizing the start of injection and duration of injection to minimize the associated compromises on the combustion process. The results demonstrate that splitting the injection event generally lowers the in-cylinder temperature and reduces the fuel mass that reaches the cylinder liner. This leads to a lower probability of creating oil-fuel droplets, which may act as a precursor for pre-ignition. The split injection strategy with a late injection when the piston is close to top dead center is shown to perform even better in terms of pre-ignition suppression, while providing comparable indicated mean effective pressure and cycle-to-cycle variation to the baseline case with a single injection pulse. Finally, the injection pressure is varied to establish an optimal combination of operating parameters for avoiding pre-ignition in high specific output gasoline engines.

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Boosting and Direct Injection -Synergies for Future Gasoline Engines

Cited by 37 publications

References 0 publications

Exhaust gas recirculation boosted direct injection gasoline engines

Exhaust gas recirculation boosted direct injection gasoline engines

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

Optimizing split fuel injection strategies to avoid pre-ignition and super-knock in turbocharged engines

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