Is a High Pressure Direct Injection System a Solution to Reduce Exhaust Gas Emissions in a Small Two-Stroke Engine?

Bertsch, Markus; Beck, Kai W.; Matousek, Thomas; Spicher, Ulrich

doi:10.4271/2013-32-9143

Cited by 8 publications

(5 citation statements)

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“…[12][13][14] The trend of variation of HC emission share rates is similar to the CO emissions. 12,15 For NO x emissions, the smallest variation occurs at mode 2 and the maximum is at idle mode. Plenty of NO x emissions are generated at high loads; however, the NO x is very sensitive to temperature and rich oxygen in the combustion area, which leads to a large deviation.…”

Section: Variation In Share Ratesmentioning

confidence: 99%

A statistical analysis of emission features in non-road small SI engines with the same displacement

Mei

Wang

Dai

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Emission share rates at various operating modes for non-road small spark-ignition engines are comprehensively analyzed, based on 25 sets of emissions data from one particular type of engine with the same displacement manufactured by different factories. The results of the statistical analysis show that the greatest contribution for CO and HC emissions occurs at mode 3, while that for NO x emissions occurs at mode 2. At the rated power mode 1, the average share rates for each pollutant, especially NO x , are beyond their weighting factors. The sum of contributions at modes 2-4 to CO and HC final emissions is close to their summary weighting factors, while the NO x emission characteristic differs greatly. As for each pollutant, the share rates of modes 5-6 are very low and negligible. The maximum standard deviation of share rate for NO x emission appears at mode 1, while the coefficient of variation differs greatly, especially at small-load modes. At the representative mode 1, the correlation coefficients between specific CO, HC and NO x emissions with the excess air ratio are 20.874, 20.762 and 0.946, respectively. Even more, the specific HC + NO x emission shows a positive correlation as high as 0.933, despite the negative correlation of HC. Therefore, a proper excess air ratio of [0.8, 0.9] is recommended for reducing more NO x at mode 1. While at middle and small loads, the excess air ratio should be moderately increased to reduce HC and CO emissions, as well as aiding better fuel consumption. From these results, this study can do a great service in the low-emission management, for non-road gasoline engines without after-treatment devices, to meet current and future emission directives.

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Section: Variation In Share Ratesmentioning

confidence: 99%

A statistical analysis of emission features in non-road small SI engines with the same displacement

Mei

Wang

Dai

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The study of increasing the fuel pressure at the GDI was carried out using a fuel pump driven by a two-lobe cam (Andwari et al, 2018) but this could increase the power required to drive the mechanical fuel pump although, the advantage of the higher fuel pressure higher, can be compensated for by better spray atomization, lower exhaust particulate emissions, and increased fuel efficiency (Husted, Spegar and Spakowski, 2014) trials on 2-stroke gasoline engines direct injection confirmed this emission reduction, the use Mechanical fuel pumps such as those commonly used in diesel engines limit engine operation at low engine speeds (Bertsch et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fuel Pump Pressure Variations on the Performance of 2-Stroke Gasoline Direct Injection Engines

Darwin Rio Budi Syaka,

I Wayan Sugita,

Nugroho Gama Yoga

et al. 2024

ASIIMETRIK

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The direction of technological development in 2-stroke gasoline direct injection engines is to improve engine performance and reduce exhaust gas pollution, where the solution to achieve this is to use a high-pressure electric fuel pump that produces stable fuel pressure and is practical in its application. This research aims to determine the influence of variations in fuel pressure on the performance, especially torque and power, of a 2-stroke gasoline direct injection engine. Tests were carried out on a 110 cc 2-stroke gasoline direct injection motorcycle engine using Research Octane Number (RON) 90 fuel at varying fuel pressures of 7.5 Bar, 8 Bar, and 8.5 Bar on a chassis dynamometer to obtain engine performance data in the form of torque and power. The results of this research show that increasing fuel pressure will increase the atomization of fuel particles so that it will influence increasing the performance of this engine, where maximum torque and power of 6.20 Nm and 2.00 kW are achieved at 3250 rpm, at a pressure of 8.5 Bar.

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“…It is a good solution to implement a system that injects only fuel into the combustion chamber of the engine [3]; [4], unlike other systems that mix gasoline with previously compressed air [5]; [6]; [7], with good results, but signi cantly increase the cost and complexity of the entire installation.…”

Section: Introductionmentioning

confidence: 99%

Low-pressure gasoline direct injection system development and emissions analysis for a reciprocating two-stroke engine

Gutiérrez,

Sala,

Delpeuch

2023

Preprint

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This study presents the design and construction of an electronic low-pressure gasoline direct injection system for two-stroke engines, with the objective to study engine performance and the emission of exhaust polluting gases, maintaining the expectations of this type of engine. The investigation includes a test bench with an incorporated engine and the required control devices for this, as well as a gas analyzer Class 0, a Computerized Data Acquisition and several tools for displaying and process all the electronic signals from the engine in real time. In order to manage this system, a custom electronic injection control unit has been designed and built, which allows control the fuel injection timing and duration. This unit uses the signal from an inductive sensor installed in the crankshaft as a reference and synchronization point. Additionally, modifications have been made to the fuel feeder circuit and the electronic of the test engine, as well as to some parts of the mechanism in order to adapt them to this technology. The implementation of the engine tests is described, and the performance and operational points of the original system and those of the new injection system are evaluated.

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Is a High Pressure Direct Injection System a Solution to Reduce Exhaust Gas Emissions in a Small Two-Stroke Engine?

Cited by 8 publications

References 0 publications

A statistical analysis of emission features in non-road small SI engines with the same displacement

A statistical analysis of emission features in non-road small SI engines with the same displacement

The Influence of Fuel Pump Pressure Variations on the Performance of 2-Stroke Gasoline Direct Injection Engines

Low-pressure gasoline direct injection system development and emissions analysis for a reciprocating two-stroke engine

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