Characterization of Different Injection Technologies for High Performance Two-Stroke Engines

Winkler, Franz; Oswald, Roland; Schoegl, Oliver; Foxhall, Nigel

doi:10.4271/2016-32-0001

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…The endurance has been greatly improved, and the emission characteristics have matched the level of a four-stroke port injection engine [34]- [36]. Winkler et al compared the power and emission performance levels of E-TEC DI and low-pressure direct injection (LPDI) systems under different operating conditions with the same basic engine, and the E-TEC system was better in all part-load applications, especially under idle and low loads [37]. The self-pressurized injection system does not require a highpressure fuel pump and fuel rail, which simplifies the fuel system, makes it easy to apply to different engines, helps maintain a high power-to-weight ratio and is suitable for aviation piston engines.…”

Section: Introductionmentioning

confidence: 99%

Drive Control Experimental Studies on the Injection Characteristics of a Self-Pressurized Injector

Wei

Liu

et al. 2021

IEEE Access

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As a miniaturized direct-injection (DI) solution, a self-pressurized injector is of great significance for small aviation piston engines, such as the spark-ignited two-stroke heavy-fuel engines. Accurate control of the timing and amount of injections is an important application prerequisite. In this paper, a high-speed camera is employed to study the spray characteristics, injection delay and fuel injection duration under three drive modes in a constant-volume bomb environment. The results show that the 8-A constantcurrent drive mode ensures the minimum injection dead zone and linearity of the flow characteristic curve, and the spray characteristics are close to those under a peak current of 10 A and holding current of the 8-A drive mode, which indicates that the drive circuit can be simplified. Ambient pressure increase leads to an increased injection delay and shortened injection duration. Therefore, it is recommended to apply the 10-A constant-current drive mode to reduce the impact of the ambient pressure. The double-injection characteristics of the self-pressurized injector are also studied, and the results demonstrate that when the interval time is reduced to 2 ms, the spray characteristics of the secondary injection are affected, and when the interval time is reduced to 0.2 ms, the spray characteristics of the primary injection are also affected. To ensure consistency of the spray characteristics, the minimum spray interval should be longer than 3 ms. INDEX TERMS aviation aircraft, direct injection, spray characteristics, piston engine, self-pressurized injector.

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Section: Introductionmentioning

confidence: 99%

Drive Control Experimental Studies on the Injection Characteristics of a Self-Pressurized Injector

Wei

Liu

et al. 2021

IEEE Access

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Fine-tuning of a two stoke engine in full power configuration provided with a Low Pressure Direct Injection system

et al. 2017

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Potential of a Production DI Two-Stroke Engine Adapted for Range Extender and Motorcycle Applications

Duret,

Venturi,

Sciarretta

et al. 2017

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">The main purpose of this paper will be to investigate if a small snowmobile gasoline Direct Injected (DI) two-stroke engine has the potential to be adapted for two other types of applications: as a range extender (REX) for electric vehicles and for a motorcycle application.</div><div class="htmlview paragraph">For the REX application, the main requested specifications (NVH, lightweight, compactness, minimum production cost and easy maintenance), correspond well to the main features of DI 2-stroke engines. The potential of a modified production engine operating in part load ultra-low NOx Controlled Auto Ignition (CAI) to meet the Euro 6 emissions standards on the NEDC cycle has already been demonstrated in a previous paper. In the first part of this new paper, we will investigate which solutions can be used to maintain this potential with even stricter legislations based on Euro 6d, WLTP cycle and Real Driving Emissions (RDE).</div><div class="htmlview paragraph">In the second part of this paper, the feasibility of using the same production DI 2-stroke base engine for a motorcycle application will be studied. To meet the future Euro 4 and 5 motorcycle emissions standards on the new WMTC driving cycle, new combustion strategies have to be implemented. They are based on the use of CAI at part load and of the control of the air-fuel ratio at higher load combined with a 3-way catalyst aftertreatment technology.</div><div class="htmlview paragraph">The encouraging results achieved show that such small DI 2-stroke engine could be a very attractive candidate for a low emissions motorcycle application as well as for a range extender application in an electric vehicle.</div></div>

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Characterization of Different Injection Technologies for High Performance Two-Stroke Engines

Cited by 6 publications

References 16 publications

Drive Control Experimental Studies on the Injection Characteristics of a Self-Pressurized Injector

Drive Control Experimental Studies on the Injection Characteristics of a Self-Pressurized Injector

Fine-tuning of a two stoke engine in full power configuration provided with a Low Pressure Direct Injection system

Potential of a Production DI Two-Stroke Engine Adapted for Range Extender and Motorcycle Applications

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