EFFICIENCY IMPROVEMENT METHODOLOGY FOR FUNCTIONING OF MACHINE-TRACTOR DIESEL UNIT WITH ELECTRONIC POSITIONAL REGULATION OF FUEL SUPPLY

The relevance of this study is due to the low performance of diesel engines of machine-tractor units, with widespread separate type fuel injection systems, on partial and unsteady operating modes. The purpose of this article is to develop methods and technological practices for increasing the efficiency of a diesel engine of a machine-tractor unit with a positional effect on the fuel supply control bodies. The leading method for investigating the problem is to evaluate the interaction process of the regulator-diesel engine system on partial and unsteady operating modes. Results of the research: An information model for the functioning of a diesel engine of a tractor unit in dynamic modes has been developed. It is a combination of technological models and workflows of units, systems and mechanisms of a machinetractor unit having cause-effect relationships. A mathematical model has been developed for the operation of a machine-tractor unit engine, which makes it possible to determine the patterns of change in the speed limit depending on the disturbances in force: an increase in the cycle fuel supply and the degree of irregularity of the resistance moment. There was established the need to increase the cycle fuel supply relative to the increase in the moment of resistance of a diesel machine-tractor unit on the basis of motor tests on partial and unsteady modes. With the values of the degree of non-uniformity of the moment of resistance 0.20-0.80, the positional electronic regulation will reduce the overspeed by 20 ... 70 min-1, and reduce the transition time by 0.2. 1.4 s in partial modes. Reducing the overload of the crankshaft rotational speed and reducing the duration of the engine transitional process contributed to an increase in the efficiency of the diesel engine (the power increase was 13.5%, the effective specific fuel consumption decreased by 23.8%)..