STUDY ON THE ORWING REGIME OF THERMAL MOTORS OF AGRICULTURAL TRACTORS
Motor vehicle rating parameters are expressed using features that are graphical representations of sizes that make it possible to compare with other similar engines and establish behavior in service. For motor vehicle dynamics, the engine speed or external characteristic speed characteristic is used, which represents the actual power variation curve and the actual moment depending on the engine speed or angular speed. At present, standards on engine testing methods vary from country to country, with regard to no. engine mounts during the tests, the volume of test work and the working conditions.
As a result, for one and the same engine, it is possible to obtain different speed and load characteristics, depending on the standard or the tests performed.
It has been found that the increase in the speed above the maximum allowable value, the engine power is considerably reduced due to the worsening of the filling of the cylinders with the fuel mixture and the mechanical losses in the motor. For these reasons and in order to avoid the high dynamic loads it is recommended that at maximum speed the displacement max. do not exceed the maximum power speed by 10 ... 20%.