METHOD OF FUEL FEED CONTROL AND DEVICE TO THIS END

摘要

FIELD: engines and pumps.SUBSTANCE: proposed device comprises high-pressure fuel pump and high-pressure hydraulic accumulator communicated therewith, high pressure control valve for said hydraulic accumulator, needle directly connected with first piezo drive and electronic control unit. Every nozzle of this device is equipped with two high-pressure control valves with piezo drives with smooth or stepped voltage variation. It incorporates low-pressure hydraulic accumulator. First high-pressure control valve with second piezo drive is arranged between high-pressure hydraulic accumulator and at high-pressure chamber inlet with limited volume under nozzle needle. Second high-pressure control valve with third piezo drive is arranged between high-pressure chamber outlet with limited volume under nozzle needle and drain or low-pressure hydraulic accumulator. Low-pressure hydraulic accumulator outlet is connected via pressure control valve or check valve with high-pressure fuel pump inlet.EFFECT: better controllability, setting of required pressure law and volume of fuel injection.2 cl, 4 dwg