US 4,378,000 AGranted

Fuel supply device for internal combustion engine

AssigneeHitachi, Ltd.

InventorsHisanori Moriya, Takeshi Atago

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Abstract

A fuel supply device for an internal combustion engine having an intake manifold includes a throttle body defining therein an intake passage communicating at one end thereof with the intake manifold. A flow accelerating valve arranged in the intake passage upstream of a throttle valve cooperates with the wall surface of the intake passage to define a flow accelerating passage of a smaller flow area than the intake passage. The flow accelerating valve is angularly movable in response to a change in the intake fluid flow between a fully closed position in which the flow accelerating passage has a minimum flow area and a fully open position in which the flow accelerating passage has a maximum flow area, to thereby control the flow area of the flow accelerating passage. A fuel injector injects liquid fuel into the accelerated intake fluid flow passing through the flow accelerating passage.

Claims12

Dependent claims

A fuel supply device for an internal combustion engine including an intake manifold, the fuel supply device comprising:

a throttle body defining therein an intake passage having one end thereof communicating with said intake manifold;
a throttle valve in said intake passage for controlling intake fluid flow introduced into the engine through said intake passage and said intake manifold;
flow accelerating means disposed in said intake passage upstream of said throttle valve, said flow accelerating means cooperating with the wall surface of said intake passage to define therein an accelerating flow passage having a flow area less than that of said intake passage, the intake fluid flow passing through said intake passage being accelerated when the intake fluid flow passes through said accelerating flow passage, said flow accelerating means being movable in response to a change in the intake fluid flow introduced into the engine through said intake passage between a fully closed position in which said accelerating flow passage has a minimum flow area and a fully open position in which said accelerating flow passage has a maximum flow area, to control the flow area of said accelerating flow passage;
and
a fuel injector having a nozzle disposed upstream of said throttle valve and downstream of said flow accelerating means when the flow accelerating means is in the fully closed position, said fuel injector being adapted to inject liquid fuel through said nozzle into the accelerated intake fluid flow passing through said accelerating flow passage and being disposed so as to be directed toward said accelerating flow passage such that the fuel injected from said injector does not substantially impinge against said flow accelerating means over the entire operating range of the engine.

2 more elements

A fuel supply device for an internal combustion engine including an intake manifold, the fuel supply device comprising:

a throttle body defining therein an intake passage having one end thereof communicating with said intake manifold;
a throttle valve in said intake passage for controlling intake fluid flow introduced into the engine through said intake passage and said intake manifold;
flow accelerating means disposed in said intake passage upstream of said throttle valve, said flow accelerating means cooperating with the wall surface of said intake passage to define therein an accelerating flow passage having a flow area less than that of said intake passage, the intake fluid flow passing through said intake passage being accelerated when the intake fluid flow passes through said accelerating flow passage, said flow accelerating means being movable in response to a change in the intake fluid flow introduced into the engine through said intake passage between a fully closed position in which said accelerating flow passage has a minimum flow area and a fully opened position in which said accelerating flow passage has a maximum flow area, to control the flow area of said accelerating flow passage;
the fuel injector having a nozzle disposed upstream of said throttle valve and downstream of said flow accelerating means when the flow accelerating means is in the fully closed position, said fuel injector injecting liquid fuel through said nozzle into the accelerated intake fluid flow passing through said accelerating flow passage;
and
a wall member disposed in said accelerating flow passage to divide the same into a first flow passage section having a fixed flow area and a second flow passage section having a variable flow area, said first flow passage section has a generally cylindrical downstream end portion, said nozzle of said fuel injector is disposed in said downstream end portion with an annular space left between said nozzle and a wall surface of said downstream end portion.

3 more elements

Dependencies are inferred from the claim text.