| Popis: |
Oil consumption through burning is not only an important operating indicator of an agricultural machine and tractor unit (MTU); it is the descriptor of how well-designed a diesel engine is. When Volkswagen engines were found to have excessive fuel and oil consumption through burning, the company had to face penalties and wide negative media coverage. Designing the elements and systems of diesel engines implies studying how the parameters of the cylinder-piston group (CPG), the lubrication systems, the fuel injection system, and speed controllers affect such indicators as the indicated torque, power, specific fuel consumption, and last but not least, the moment of mechanical losses in the engine friction pairs. The research so far allows hypothesizing that the nature and magnitude of changes in the crankshaft rotation speed, oil pressure in the main oil-distributing passage (MODP), and the moment of mechanical losses cause increased burning of oil in a wide range of speeds and loads characteristics of MTU operation. The hypothesis can be confirmed by means of an adjuster installed in a diesel-engine MODP, which reduces the oil consumption through burning by lowering the amplitude of fluctuations in the mechanical-loss moment as well as by reducing the friction forces as the source of self-oscillations. The paper describes the transport and plowing operations of a K-744R-05 Kirovets tractor equipped with a PUN-8-40 plow for the use on light soils. For the two operation types, the researchers have plotted the oil-burning frequency response (FR) state surfaces in two settings: a YaMZ-238ND5 diesel engine, standard configuration, and the same engine, adjuster-equipped. |
