Gasoline fuel supply system

Patent metadata

Field	Value
Publication number	US-2018051663-A1
Application number	US-201615556472-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	Jun 10, 2015
Publication date	Feb 22, 2018
Grant date	—

Abstract

A gasoline fuel supply system includes a feed pump part, an inline pump part, and a high-pressure pump part. The feed pump part includes a non-positive displacement electric pump, and pumps a gasoline fuel from a fuel tank and discharges at a feed pressure. The inline pump part includes a non-positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the feed pump part and discharges at a middle pressure. The high-pressure pump part includes a positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the inline pump part and discharges at a supply pressure to a fuel injection valve.

First claim

1 . A gasoline fuel supply system that supplies a gasoline fuel to a fuel injection valve by pumping from a fuel tank so as to be directly injected by the fuel injection valve into a cylinder of an internal-combustion engine, the gasoline fuel supply system comprising:
a feed pump part including a non-positive displacement electric pump which operates in response to receiving electric power, and pumping the gasoline fuel from the fuel tank and discharging at a feed pressure; an inline pump part including a non-positive displacement mechanical pump which operates in response to receiving an output of the internal-combustion engine, and pressurizing the gasoline fuel discharged from the feed pump part and discharging at a middle pressure; and a high-pressure pump part including a positive displacement mechanical pump which operates in response to receiving the output of the internal-combustion engine, and pressurizing the gasoline fuel discharged from the inline pump part and discharging at a supply pressure to the fuel injection valve.

2 . The gasoline fuel supply system according to claim 1 , wherein
the inline pump part has a check valve which regulates an adverse current of the gasoline fuel discharged from the non-positive displacement mechanical pump.

3 . The gasoline fuel supply system according to claim 1 , wherein
the inline pump part has a relief valve which releases a discharge pressure of the non-positive displacement mechanical pump, when the discharge pressure exceeds an upper limit pressure assumed relative to the middle pressure.

4 . The gasoline fuel supply system according to claim 1 , wherein
the non-positive displacement mechanical pump of the inline pump part raises the middle pressure, as the supply pressure, which is demanded in response to a rotation speed of the internal-combustion engine, is raised.

5 . The gasoline fuel supply system according to claim 1 , wherein
the non-positive displacement electric pump located inside the fuel tank pumps the gasoline fuel in the feed pump part.

6 . The gasoline fuel supply system according to claim 1 , wherein
the feed pump part has a fuel filter filtering the gasoline fuel discharged from the non-positive displacement electric pump.

Assignees

• Denso Corp
• Denson Corp

Inventors

• Hayashi Norihiro

Classifications

• F02M59/366

  Valves being actuated electrically · CPC title

• F02M63/027

  More than one high pressure pump feeding a single common rail · CPC title

• F02M39/005

  Arrangements of fuel feed-pumps with respect to fuel injection apparatus (F02M37/00 takes precedence) · CPC title

• F02M59/102

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F02M59/02

  of reciprocating-piston {or reciprocating-cylinder} type · CPC title