US 10,208,724 B2 · Fuel supply device and fuel supply method

Abstract

A fuel supply device includes: a linear actuator; a reciprocating pump having a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel when the boosting piston moves in a first direction and configured to boost and eject the fuel when the boosting piston moves in a second direction; and a controller configured to control driving of the linear actuator so as to adjust an amount of the fuel ejected from a boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine. The adjustment adjusts a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction.

Claims20

Dependent claims

A fuel supply device for supplying fuel into a combustion chamber of an internal combustion engine, the fuel supply device comprising:

a linear actuator;
a reciprocating pump having a boosting cylinder and a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel into the boosting cylinder when the boosting piston moves in a first direction in the axial direction and configured to boost and eject the fuel from the boosting cylinder when the boosting piston moves in a second direction in the axial direction;
and
a controller configured to control driving of the linear actuator, the controller being configured to control the linear actuator so as to adjust an amount of the fuel ejected from the boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine, and configured to perform adjustment of the ratio of the fuel ejection time and the fuel suction time by adjusting a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction in accordance with the load of the internal combustion engine.

1 more element

A fuel supply device for supplying fuel into a combustion chamber of an internal combustion engine, the fuel supply device comprising:

a low pressure fuel supply pipe configured such that a low pressure fuel is supplied;
a high pressure fuel supply pipe configured such that high pressure fuel to be supplied into the combustion chamber is supplied;
a plurality of fuel supply units provided between the low pressure fuel supply pipe and the high pressure fuel supply pipe, each of the fuel supply units being configured to boost the fuel in the low pressure fuel supply pipe and supply the boosted fuel to the high pressure fuel supply pipe;
and
a control unit configured to control the plurality of fuel supply units, each of the fuel supply units including:
a linear actuator;
a reciprocating pump having a boosting cylinder and a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel into the boosting cylinder when the boosting piston moves in a first direction in the axial direction and configured to boost and eject the fuel from the boosting cylinder when the boosting piston moves in a second direction in the axial direction;
and
a controller configured to control driving of the linear actuator,
the control unit being configured to control, via the controller, the linear actuator so as to change a total amount of the fuel ejected from each boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine, and configured to perform, via the controller, adjustment of the ratio of the fuel ejection time and the fuel suction time by adjusting a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction in accordance with the load of the internal combustion engine.

7 more elements

A fuel supply method for supplying fuel into a combustion chamber of an internal combustion engine, the method comprising the steps of:

allowing reciprocating movement of a boosting piston driven by a linear actuator in an axial direction, sucking the fuel into a boosting cylinder when the boosting piston moves in a first direction in the axial direction, and boosting and ejecting the fuel from the boosting cylinder when the boosting piston moves in a second direction in the axial direction;
and
adjusting an amount of the fuel ejected from the boosting cylinder per reciprocating time of the boosting piston in accordance with a load of the internal combustion engine by adjusting a ratio of a fuel ejection time and a fuel suction time without changing the reciprocating time, the ratio of the fuel ejection time and the fuel suction time being adjusted by adjusting, through the linear actuator, a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction in accordance with the load of the internal combustion engine.

Dependencies are inferred from the claim text.

Fuel supply device and fuel supply method

Life of this patent

Fuel supply device and fuel supply method

Life of this patent

Abstract

Claims20