CPC F02D 41/402 (2013.01) [F02D 41/3845 (2013.01); F02D 2200/021 (2013.01); F02D 2200/0404 (2013.01); F02D 2200/0602 (2013.01); F02D 2200/101 (2013.01); F02D 2250/31 (2013.01)] | 9 Claims |
1. A port fuel injection system for an internal combustion engine having a plurality of engine cylinders, each engine cylinder having an intake port, at least one intake valve, and a combustion chamber, said port fuel injection system comprising:
a fuel reservoir containing a supply of liquid fuel;
a fuel pump connected to the fuel reservoir and arranged to produce a flow of pressurized liquid fuel from the fuel reservoir at a pressure between 10 and 50 bar;
a fuel rail connected to receive said flow of pressurized liquid fuel, said fuel rail including a pressure sensor producing a signal corresponding to the fuel pressure in said fuel rail;
a plurality of fuel injectors, including one fuel injector positioned in the intake port of each engine cylinder upstream of the intake valve for the engine cylinder; and
an engine control unit (ECU) that receives signals from sensors on the internal combustion engine corresponding to engine temperature, engine rotational speed, crank shaft rotational position, engine throttle position, and fuel rail pressure,
wherein said ECU is programmed to deliver fuel through each fuel injector to each engine cylinder over a full range of engine operating conditions by controlling each fuel injector to inject fuel into the intake port at a first or second time of injection, a first time of fuel injection for each engine cylinder corresponding to a time when the intake valve is closed for a first range of engine operating conditions and a second time of fuel injection corresponding to a time when the intake valve is open for a second range of engine operating conditions.
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