Sirota O. Improvement of fuel economy and ecological indexes of multicylinder petrol engine by application of the combined method for power adjusting

Dissertation is devoted to the improvement of fuel economy and ecological indexes of multicylinder petrol engines in the unsteady modes by application of the combined method for power adjusting. Calculation researches on the mathematical model, which has been developed and adequacy of which experimentally confirmed, is evident the possibility of improvement of fuel economy at transition to the combined method of power adjusting on 7,48 %. The most optimum range of work for the petrol engine with the group of power-offs cylinders has been set from the point of view of improvement the ecological indexes. Has been developed the chart and construction of the automatic processes control system of disconnecting and including of group of cylinders, on which the patents of Ukraine № 28208 and № 46951 are got. The experimental stand researches of engine 6Ч 9,5/6,98 at unsteady modes has been conducted which rotined the improvement of fuel economy at the combined method on 8,05 %. It is set that duration of transient process at the change of amount of working cylinders does not exceed 0,15 second and is within the limits of one - two duty cycles. Indication of working process of engine 6Ч 9,5/6,98 rotined that the fuel economy of engine got better due to growth of indicators indexes and diminishing of mechanical losses.