A method of controlling a high pressure pump having a compression chamber and a fuel chamber at the opposite end of a plunger

摘要

A method of controlling a high pressure pump configured to draw fuel from an inlet chamber (302) into a compression chamber (304), the high pressure pump comprising: a plunger (14) adapted to pressurize the inlet chamber (302) into the compression chamber Compression chamber (304) of sucked fuel is movable backwards and forwards; a cylinder (22) in which the plunger (14) is supported and is movable back and forth; a control valve (102) configured to interrupt communication between the inlet chamber (302) and the compression chamber (304) for dosing the dispensed fuel; a fuel chamber (308) configured to change the volume in accordance with a movement of the plunger (14); an exhaust passage (310) configured to connect the inlet chamber (302) to the fuel chamber (308); and a discharge valve (60) configured to deliver the fuel pressurized by the plunger (14), wherein when the plunger (14) moves downwardly to draw the fuel from the inlet chamber (302) into the compression chamber (304) , the fuel chamber (308) reduces its volume to thereby force the fuel from the fuel chamber (308) toward the inlet chamber (302), and when the plunger (14) moves upward to remove the fuel from the compression chamber (30). 304) to the inlet chamber (302), the fuel chamber (308) increases in volume thereby to suck a portion of the fuel returned to the inlet chamber (302) through the exhaust passage (310) toward the fuel chamber (308) the control valve (102) comprises a valve element (104), a valve seat (106), a spring (33) and a coil (34), ...