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Determination of the total efficiency of direct injection SI engine working on stratified charge

100%

Cygnar M. , Sendyka B.

tom Vol. 13, No. 2

59-65

The paper presents determination of the total efficiency of GDI Engine working on stratified charge. For the determination of the total efficiency of a Gasoline Direct Injection engine, test bed investigations were carried out with the aim to determine the speed and load characteristics of the investigated engine. On this basis, the total efficiency of a GDI engine can be determined. The results of the performed analysis were given in two-dimensional diagrams. Characteristics of full power and torque in dependence on rotational speed, characteristics of torque for increasingly smaller partial powers in function of rotational speed, characteristics of partial loads r in function of rotational speed, relation of fuel consumption per hour and per unit for full value of rated power in dependence on rotational speed, load characteristics of fuel consumption in function of torque at constant rotational speeds, relation of fuel consumption in function of rotational speed and relation of total efficiency eta0 in function of rotational speed are presented in the paper.

The description of the total efficiency of 2SZ-FE engine with the variable valve timing

63%

Sendyka B. , Sochan A. , Noga M. , Rodak Ł.

tom Vol. 14, No. 2

401-407

In this paper there were conducted tests of the combustion engine with the Atkinson cycle and with applying variable valve timing. There was described the 2SZ-FE engine characteristics and assigned the total efficiency before and after application of the phase shifter. Secondly, there was determined the thermal efficiency of the single engine work cycles and also engine 's total efficiency by using the optoelectronic pressure sensor and mathematical programme. After that, it was available to present the range of the variable valve timing. Atkinson system, phases of 2SZ-FE engine timing gear, the total efficiency distribution during 75 % of throttle opening and when inlet valves are open, the total efficiency increase during 75 % of throttle opening, the total efficiency distribution during 50 % of throttle opening and when suction valves are open, the total efficiency increase during 50 % of throttle opening, the total efficiency distribution during 25 % of throttle opening and when inlet valves are opened, the total efficiency increase during 25 % of throttle opening, the total efficiency distribution with application of phases shifter are presented in the paper.

Nakładkowe drzewa logiczne dla kryterium kompromisu w optymalizacji dyskretnej na przykładzie pomp zębatych

51%

Grabowski C. , Partyka M.

2008

tom R. 49/2, nr 4-5

78-81

Optymalizacja pompy zębatej wymaga obliczenia sprawności objętościowej, hydrauliczno-mechanicznej oraz całkowitej. Ze względu na konflikt modelowy często oblicza się bezpośrednio sprawność całkowitą przy założeniu spełnienia dopuszczalnego pozostałych sprawności. Nakładkowe drzewa logiczne są dodatkową niezależną metodą.

Optimization of the gear pump requires calculations of volumetric, mechanical and total efficiencies. Because of the model conflict, total efficiency is often calculated on the assumption that the other efficiencies are acceptable. Multiple-dimensional logical trees are the additional independent method.