US 7,013,869 B2Granted

Fuel supply system for internal combustion engine

AssigneeHitachi, Ltd.

InventorsMasami Nagano, Takanobu Ichihara, Hiroaki Saeki

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Abstract

The present invention provides an electronically-controlled fuel injector, for an internal combustion engine, comprising a downstream fuel injection valve located near an air intake port of each cylinder or inside a cylinder, an air intake passage which bypasses the throttle valve located upstream of a downstream fuel injection valve, and a fuel vaporizing section including an upstream fuel injection valve, and a heater which vaporizes fuel injected from the upstream fuel injection valve; and further having an air intake port located upstream of the throttle valve, air flow control section for controlling an amount of air, said fuel vaporizing section, vaporized-fuel branch section for supplying vaporized fuel to each cylinder, and a vaporized-fuel distribution passage which extends from the vaporized-fuel branch section to an opening located in each air intake pipe located downstream of the throttle valve.

Claims13

Dependent claims

A fuel supply system for an internal combustion engine comprising:

an air intake pipe for taking in air;
a throttle valve disposed in said air intake pipe for controlling an amount of said air;
a downstream fuel injection valve located near an air intake port of a cylinder of an internal combustion engine or inside a cylinder;
a bypass air intake passage for bypassing said throttle valve located upstream of said downstream fuel injection valve;
a fuel vaporizing section including an upstream fuel injection valve connected to said bypass air intake passage;
and a heater for vaporizing fuel injected from said upstream fuel injection valve;
said bypass air intake passage having a vaporized-fuel branch section for channeling said vaporized fuel to said each cylinder, and a vaporized-fuel distribution passage extending from said vaporized-fuel branch section to an opening located in each air intake pipe located downstream of said throttle valve, wherein concerning the length of said bypass air intake passage, the shortest passage between those cylinders that have overlapping air intake timing is longer than the shortest passage between those cylinders that do not have overlapping air intake timing.

4 more elements

A fuel supply system for an internal combustion engine comprising:

an air intake pipe for taking in air;
a throttle valve disposed in said air intake pipe for controlling an amount of a downstream fuel injection valve located near an air intake port of a cylinder of an internal combustion engine or inside a cylinder;
a bypass air intake passage for bypassing said throttle valve located upstream of said downstream fuel injection valve;
a fuel vaporizing section including an upstream fuel injection valve connected to said bypass air intake passage;
and a heater for vaporizing fuel injected from said upstream fuel injection valve;
said bypass air intake passage having a vaporized-fuel branch section for channeling said vaporized fuel to said each cylinder, and a vaporized-fuel distribution passage extending from said vaporized-fuel branch section to an opening located in each air intake pipe located downstream of said throttle valve, wherein an orifice is disposed in said vaporized-fuel distribution passage which is connected to each cylinder, and the diameter of the orifice of at least one of said cylinders is different from that of other cylinders, and said orifice is located slightly upstream in said vaporized-fuel distribution passage.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/681,245Filed 9 Oct 2003
Priority: JP 2002-29687310 Oct 2002
Published: US 2005/0022783 A13 Feb 2005
Granted: 21 Mar 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F02M 69/32
Characterised by means for facilitating the starting-up or idling of engines or by means for enriching fuel charge, e.g. below operational…: with…
F02D 41/3094
Controlling fuel injection: the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the…
F02M 31/135
Electrically: fuel-air mixture
F02M 31/18
Other apparatus for heating fuel: to vaporise fuel