High-pressure fuel pump and control device

Patent metadata

Field	Value
Publication number	US-10337480-B2
Application number	US-201615580480-A
Country	US
Kind code	B2
Filing date	Aug 1, 2016
Priority date	Sep 30, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

Provided is a high-pressure fuel pump in which responsiveness of closing a suction valve can be maintained even when the high-pressure fuel pump is increased in pressure or capacity of the high-pressure fuel pump is increased, thereby ensuring discharge efficiency. Therefore, the high-pressure fuel pump includes the rod that urges the suction valve in the valve opening direction, the mover that drives the rod in the valve closing direction, and the solenoid that generates a magnetic attraction force for moving the mover in the valve closing direction. After the suction valve starts moving from the suction valve closing position in the valve opening direction, the rod reaches the suction valve closing position and further moves in the valve opening direction.

First claim

The invention claimed is:

1. A high-pressure fuel pump comprising:
a rod that urges a suction valve in a valve opening direction;
a mover that drives the rod in a valve closing direction; and
a solenoid that generates a magnetic attraction force to move the mover in the valve closing direction, wherein
the rod reaches a suction valve closing position and then moves in the valve opening direction after the suction valve starts moving from the suction valve closing position in the valve opening direction, and
the mover is configured to be movable in the valve opening direction independently of the rod.

2. The high-pressure fuel pump according to claim 1 ,
wherein when a moving distance from a rod closing position of the rod to the suction valve closing position is a rod moving distance,
after the suction valve starts moving from the suction valve closing position in the valve opening direction, the mover completes a movement of the rod movement distance from the mover closing position and further moves in the valve opening direction.

3. The high-pressure fuel pump according to claim 1 ,
wherein an intermediate current lower than a maximum current flows after the maximum current flows through the solenoid, and the mover moves in the valve closing direction, and the intermediate current is interrupted after the suction valve starts moving from the suction valve closing position in the valve opening direction.

4. The high-pressure fuel pump according to claim 1 ,
wherein an intermediate current lower than a maximum current flows after the maximum current flows through the solenoid, and the mover moves in the valve closing direction, and the intermediate current is interrupted after the plunger that pressurizes the pressurizing chamber reaches a top dead center.

5. The high-pressure fuel pump according to claim 1 ,
wherein an intermediate current lower than a maximum current flows after the maximum current flows through the solenoid, the mover moves in the valve closing direction, and the intermediate current is interrupted before the plunger that pressurizes the pressurizing chamber reaches a top dead center.

6. A high-pressure fuel pump comprising:
a rod that urges a suction valve in a valve opening direction;
a mover formed separately from the rod; and
a solenoid that generates a magnetic attraction force for moving the mover in a valve closing direction,
wherein an intermediate current lower than a maximum current flows after the maximum current flows through the solenoid, and the mover moves in the valve closing direction, and the intermediate current is interrupted after the suction valve starts moving from a suction valve closing position to a valve opening position, and
the mover is configured to be movable in the valve opening direction independently of the rod.

7. The high-pressure fuel pump according to claim 6 ,
wherein the intermediate current is interrupted after the plunger that pressurizes the pressurizing chamber reaches a top dead center and approaches a bottom dead center from the top dead center.

8. The high-pressure fuel pump according to claim 6 ,
wherein energization of the maximum current is started during a period from a passage of a mover opening position indicating a position of the mover when the solenoid is not energized to a return to the mover opening position after the mover starts moving in a valve opening direction.

9. A control device configured to control a high-pressure fuel pump that comprises: a rod that urges a suction valve in a valve opening direction; a mover that drives the rod in a valve closing direction; and a solenoid that generates a magnetic attraction force to move the mover in the valve closing direction,
wherein the rod reaches a suction valve closing position and the control device then controls a drive current to be supplied to the solenoid so that the rod moves in the valve opening direction after the suction valve starts to move from a suction valve closing position in the valve opening direction, where the mover is configured to be movable in the valve opening direction independently of the rod.

10. The control device according to claim 9 ,
wherein the mover is made to move in the valve closing direction by causing an intermediate current lower than the maximum current to flow after flowing a maximum current to the solenoid, and the intermediate current is interrupted after the suction valve starts to move from a valve closing position to a valve opening position.

11. The control device according to claim 9 ,
wherein the mover is made to move in the valve closing direction by causing an intermediate current lower than the maximum current to flow after flowing a maximum current to the solenoid, and the intermediate current is interrupted after the plunger reaches a top dead center.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Tokuo Kenichiro
• Kusakabe Ryo
• Aritomi Shunsuke
• Usui Satoshi
• Suganami Masayuki
• Hashida Minoru
• Yagai Masamichi
• SASO Yuta
• Saito Atsuji

Classifications

• F02M2200/09

  Fuel-injection apparatus having means for reducing noise · CPC title

• F02M59/466

  Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means · CPC title

• F02M59/36

  by variably-timed valves controlling fuel passages {to pumping elements or overflow passages} · CPC title

• F02M63/0022

  the armature and the valve being allowed to move relatively to each other · CPC title

• F02M51/04

  Pumps peculiar thereto · CPC title