Scientific paper ID 2116 : 2021/3

Hydro-electronic injectors are actuated by an electromagnet and inject fuel

into the cylinders at the appropriate injection pressure, which is provided by an external

hydraulic (oil) pump and a multiplier piston located internally in the injector. They must

ensure a precise fuel metering according to the engine operating mode. The condition for

precise dosing is the correct selection and calculation of the hydraulic parameters of the

injectors such as injection pressure, diameter and number of injection holes, location of the

injection holes, etc. Therefore, the optimization of the hydraulic parameters of the injectors

has a direct impact on the efficiency of the internal combustion engine. The methodology for

determining the hydraulic parameters of hydroelectric injectors is based on the indicators

from the calculation of internal combustion engines, such as fuel consumption, fuel cycle,

injection time, etc. The characteristics of the cyclic fuel quantity depending on the engine load

are constructed, as well as the characteristics of the injection time from the engine crankshaft

speed. These characteristics are used as a starting point for determining the maximum

portion of fuel and the time for its injection. The injection pressure and the injection section

are determined accordingly. This determines the number and location of the injection holes.

The obtained data are used to build the electronic control program.