Patent ID: 6622667
Filing Date: 2003-09-23
Classification: F01P,F02B,F02D,F02F,F02M

Abstract:
An internal combustion engine, comprising:an engine block at least partially defining a cylinder; a piston reciprocally operable within said cylinder; a cylinder head cooperating with said cylinder and said piston to define a combustion chamber; and a fuel injection system including: a fuel injector for injecting fuel into said combustion chamber, said fuel injector having a fuel inlet port, a fuel outlet port, a fuel passage communicating between said fuel inlet port and said fuel outlet port, a cooling fuel inlet port, a leak-of fuel outlet port, and a cooling fuel passage communicating between said cooling fuel inlet port and said leak-off fuel outlet port; a fuel pump; a fuel supply line communicating between said fuel pump and said fuel inlet port; a bypass fuel line communicating between said fuel pump and said cooling fuel inlet port, such that overflow fuel from said fuel pump flows through said bypass fuel line, into said cooling fuel inlet port, through said cooling fuel passage and out of said leak-off fuel outlet port, thereby cooling said fuel injector, wherein the overflow fuel is recirculated from said leak-off fuel outlet port back to said fuel pump; and a fuel filter placed upstream of said fuel pump such that the overflow fuel recirculated to said fuel pump flows through said fuel filter prior to reaching said fuel pump, and such that the overflow fuel which cools said fuel injector is warmed as it flows through said fuel injector, thereby heating the fuel which flows through said fuel filter to substantially prevent ice build-up on said fuel filter during cold weather.