FUEL FEED CONTROL SYSTEM AND METHOD TO OPERATE IT Russian patent published in 2010 - IPC F02M61/18 F02M51/06 F02M47/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to automotive engines, mainly to diesel engines. Proposed control system comprises nozzle with two idle locking elements and independent control valves and two independent intermediate control chambers. Said locking elements are aligned, their orifices at different levels being either separated or not separated. Sprayer has circular grooves between different-level orifices interacting with circular ledges of appropriate locking elements. Additionally, proposed system incorporates at least two independent fuel feed control units with different control programs, furnished with guides to move therein. Every aforesaid control unit consists of at least one shaped cam per a nozzle with program for at least one fuel feed cycle. Said cam interacts with master cam and plunger arranged on platform and hydraulic cylinder mounted on the base with hole. Spring is arranged between said platform and base. Proposed system is provided with low pressure accumulator communicated with two independent nozzle control chambers, high pressure fuel pump inlet and is connected with electronic control unit. Proposed method consists in creating rarefaction for every variable-volume independent outer chambers by one preset program and with one step of volume change in one injection cycle, opening two independent control valves to communicate two aforesaid variable-volume independent outer chambers, two independent chambers of independent control valves and two control chambers arranged above two locking elements of the sprayer whereto fuel is fed from one high pressure accumulator. Simultaneously or in different time intervals, fuel is forced, via two independent intermediate chambers, under two locking elements through two levels of sprayer orifices to create pressure in two variable-volume independent outer chambers. Fuel is forced through two independent chambers of independent control valves into second outer chamber of finite volume. Two independent control valves are closed. Simultaneously or in different time intervals, pressure is fed to two locking elements from above. Fuel is cut off. Simultaneously or in different time intervals, finite variable volume level is varied in two independent variable-volume chambers either manually or automatically.

EFFECT: higher efficiency, lower fuel consumption, fuel combustion monitoring and optimised fuel combustion.

6 cl, 10 dwg