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Effect to the fuel system type on energy, economic and environmental indicators of the spark-ignition engine work

100%

Ambrozik A. , Ambrozik T. , Kurczyński D. , Łagowski P. , Jankowski R. , Kowalczyk W.

tom Vol. 21, No. 3

7--14

The paper presents selected results of tests on the Fiat Panda I car powered by 1.2 dm3 spark ignition engine. The engine had production installed fuel system with the single-point petrol injection. To improve its in-service performance, the engine was fitted with the multi-point injection fuel system. The assessment of the indicators of the work of the engine, fitted with single-point, or alternatively, multi-point injection fuel system, was conducted on the basis of the tests performed on the MAHA chassis dynamometer. First, tests were run for single-point injection fuel system. Next, the same tests were performed when the engine was fitted with the multi-point injection fuel system. In the tests, engine power, torque, fuel consumption and the concentrations of the exhaust gas components were measured. The latter included carbon monoxide CO, carbon dioxide C02, hydrocarbons HC, nitrogen oxides NOx, and oxygen 02. AVL Digas 4000 exhaust gas analyser was used to take measurements of the concentrations of the basic components of the exhaust gas and of the excess air ratio %u03BB. The investigations were conducted by performing the inertia test and by using the dynamometer to determine the basic indicators of the engine operation. In the investigations, the crankshaft rotational speed ranged from 1500 to 6500 rpm with 500 rpm step. The experimental results made it possible to evaluate how the manner and site of fuel delivery affect the engine -work indicators.

Analiza sposobów zapewnienia małej emisji (w tym metanu) z silników spalinowych zasilanych gazem ziemnym

51%

Khatchiyan A. S. , Kuznetsov V. E. , Shishlov I. G.

tom R. 45, nr 2

58-66

W artykule przedstawiono wyniki badań wolnossących i turbodoładowanych silników typu V zasilanych gazem ziemnym. W celu zmniejszenia emisji z tych silników opracowano i przebadano oryginalny system zasilania zapewniający dokładne sterowanie składem mieszanki gazowo-powietrznej w obu rzędach cylindrów. Stwierdzono, że zmniejszenie emisji związków toksycznych wymaga precyzyjnego sterowania składem mieszanki gazowo-powietrznej, zastosowania mieszanki ubogiej na obciążeniach częściowych, regulowanego turbodoładowania i odpowiedniego doboru reaktorów z palladową warstwą katalityczną.

The results of research work on unsupercharged and turbocharged V-type engines with natural gas fuelling system have been presented in the paper. For lower emission the original gas supply system has been designed which ensures very proper control of air-fuel ratio in both cylinder banks. It was stated, that lowering the emission needs very precise control of gas-air ratio, application of lean mixture on partial loads, control of turbocharging and appropriate choice of converters with palladium catalytic coach.