Patent ID: 7077101

Claim:
A hybrid fuel injection system for an internal combustion engine including a fuel reservoir, comprising: at least one fuel injector having a nozzle; at least one unit pump system, one unit pump system being connected between the fuel reservoir and respectively to each said fuel injector, each said unit pump system supplying fuel from the fuel reservoir to each said fuel injector, each said unit pump system comprising: a cam having a cam profile; and a cam roller follower operatively following said cam profile, said unit pump system providing, responsive to said cam profile, a main fuel injection at the nozzle of the respective fuel injector that is connected to the respective unit pump system; a common rail system connected commonly between the fuel reservoir and each said fuel injector, said common rail system further including a pressure fuel pump for supplying pressurized fuel from the fuel reservoir to each said fuel injector; and an electronic controller selectively controlling said common rail system to supply pressurized fuel to each said fuel injector for providing at least one secondary fuel injection thereto, individually with respect to each fuel injector at the nozzle thereof independently of the cam profile of each said unit pump system, respectively.