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The reliability, efficiency and ecological parameters of diesels are mainly determined by their operational perfomance in unstable conditions when the air supply to cylinders lags as compared to the fuel supply. Hereat, the excess air coefficient decreases, which results in decreasing the fuel consumption efficiency as well as the exhaust gas smoke. The aforesaidnecessitates the adjustment of the fuel feed depending upon the amount of the air supplied into cylinders. The modelling of the diesel controller system for the rotation frequency regarding the adjustment of the fuel feed depending upon the supercharging pressure is considered. The mathematical model of the diesel is based on calculating the gas - dynamic processes in each cycle of the cylinder operation, which makes it possibleto take into account the nonlinear characteristics of the diesel in different operational conditions as well as the discreteness of the fuel injection.

The relay control is known to permit the design of the control systems invariant with respect to outer disturbances. The features of the offered method include the relay control for each state variable and the changing value of the output signal of the relay element. To improve the electronic controller of the diesel rotation frequency a number of variants for developing the scheme structure of controlling the fuel feed in the diesel with high pressure pump are considered on the basis of digital model. In introducing feedbacks of all state variables the structures realized by means of analog (proportional) and ralay controllers were compared.