Fuel injection apparatus for internal combustion engines

Claim 1

FUEL INJECTION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE OF THE LIQUID FUEL INJECTION COMPRESSION IGNITION TYPE COMPRISING A FUEL INJECTION DEVICE INCLUDING A NOZZLE PROVIDED WITH AT LEAST ONE INJECTION ORIFICE, A PRESSURE CHAMBER, AND A VALVE CONTROLLING THE FLOW OF FUEL THROUGH THE NOZZLE AND ARRANGED TO BE OPENED AUTOMATICALLY DURING EACH INJECTION PERIOD BY THE FUEL PRESSURE IN SAID PRESSURE CHAMBER, FUEL DELIVERY MEANS ARRANGED TO DELIVER FUEL IN MEASURED QUANTITIES AND AT APPROPRIATELY TIMED INTERVALS, PASSAGE MEANS FOR THE FLOW OF FUEL FROM SAID FUEL DELIVERY MEANS TO SAID PRESSURE CHAMBER INCLUDING PASSAGES RESPECTIVELY OF RELATIVELY LARGE AND RESTRICTED CROSS-SECTIONAL AREAS, CHANGE-OVER VALVE APPARATUS HAVING A NORMAL POWER POSITION IN WHICH IT PERMITS FLOW OF FUEL THROUGH THE PASSAGE OF RELATIVELY LARGE CROSS-SECTIONAL AREA AND A RESTRICTED POWER POSITION IN WHICH IT CAUSES THE FUEL TO FLOW THROUGH THE PASSAGE OF RELATIVELY RESTRICTED CROSS-SECTIONAL AREA, AND CONTROL MEANS WHEREBY THE CHANGEOVER VALVE APPARATUS IS CAUSED TO OCCUPY ITS NORMAL POWER POSITION FOR A RANGE OF ENGINE OPERATING CONDITIONS REPRESENTING AN UPPER PART OF THE TOTAL RANGE OF ENGINE OPERATING CONDITIONS AND TO OCCUPY ITS RESTRICTED POWER POSITION OVER A RANGE OF ENGINE OPERATING CONDITIONS REPRESENTING A LOWER PART OF THE TOTAL RANGE OF ENGINE OPERATING CONDITIONS.