Pavlenko V. Enhancement of vehicle fuel saving by parameter optimization of the "engine-transmission" system

The subject of the research is the correlation between the operating mode and design characteristics of vehicle engine-transmission system under varying operating conditions. The objective of the research is to reduce operating fuel consumption of a diesel-engine truck and to improve parameters of engine-transmission system. Meth-ods of research: the tasks set have been solved both theoretically and experimentally. In the theoretical research, methods of differential equations and numerical analysis have been employed. The experimental research has been carried out by means of methods of electrical measurement of mechanical values. The task of parametric im-provement has been solved with mathematical tools of the theory of experimental planning. Theoretical and practical results: the following developments based on this scientific research have been introduced: the meter of the mode, which indications show current vehicle power values; engine loading indicator of on-board type, which allows to improvefuel consumption and power rate, vehicle and vehicle engine oper-ating mode; nomographs of determination of rational parameters of engine transmis-sion system operating mode according to operational fuel consumption have been de-veloped; methods of parametric synthesis of optimal vehicle and vehicle engine char-acteristics have been developed to establish such correlation of their design and mo-dal parameters under which the lowest fuel consumption can be provided. The num-ber of higher stages of gearbox ensuring the improved fuel consumption at vehicle speeds specified by the operating conditions have been offered for KrAZ-6510 truck with CMD-31.15 engine. The scientific novelty of the results obtained is the follow-ing: the correlation between the working cycle parameters of a supercharged diesel engine and engine load has been revealed. Based on this correlation, a method to identify vehicle engine operation factors has been developed, which allows a para-metric improvement of the engine-transmission system and provides vehicle and ve-hicle engine operating modes with an intelligent operational fuel consumption at the expense of changed transmission ratios. Level of introduction: major points of the thesis have been accepted for introduction at a holding company "AutoKraz", the main construction bureau specializing in medium powered engines, the Automobile Armament Department of the Ministry of Defence of Ukraine. The sphere of applica-tion is vehicle exploitation, overhaul and repair.