Control system
US-2016363078-A1 · Dec 15, 2016 · US
Drive unit of fuel injection device
US10900435B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10900435-B2 |
| Application number | US-201916366168-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 27, 2019 |
| Priority date | Aug 31, 2010 |
| Publication date | Jan 26, 2021 |
| Grant date | Jan 26, 2021 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowered to a current value at which a valve element cannot be held in a valve open state by stopping the applying of the high voltage from the high voltage source. Thereafter, in a stage where a supply current is switched to a hold current, another high voltage is applied to the fuel injection device from the high voltage source.
First claim
Opening claim text (preview).
The invention claimed is: 1. A drive unit of a fuel injection device having a valve and controlling a drive current based on a drive pulse, wherein the drive unit is configured to supply electric current to the fuel injection device, thereby opening the valve, and wherein the drive unit is configured to switch whether or not to reduce electric current to a current value below which the valve cannot be held in a valve open state before the drive pulse is turned OFF, corresponding to fuel pressure supplied to the fuel injection device. 2. A drive unit of a fuel injection device having a valve, wherein the drive unit is configured to supply electric current to the fuel injection device, thereby opening the valve, and wherein the drive unit is configured to switch whether or not to reduce electric current to a current value below which the valve cannot be held in a valve open state before the valve reaches a target lift, corresponding to fuel pressure supplied to the fuel injection device. 3. A drive unit of a fuel injection device having a valve, a fixed core and an anchor which drives the valve toward opening direction when the anchor moves toward the fixed core by a magnetic attraction force, wherein the drive unit is configured to supply electric current by a high voltage source which voltage is larger than a battery voltage to the fuel injection device and cause the anchor to be attracted to the fixed core, thereby opening the valve, and wherein the drive unit is configured to switch whether or not to reduce electric current to a current value below which the valve cannot be held in a valve open state before the anchor impinges the fixed core, corresponding to fuel pressure supplied to the fuel injection device. 4. The drive unit of claim 3 , wherein the fixed core and the anchor are separated by an air gap.
Assignees
Inventors
Classifications
- F02D41/20Primary
Output circuits, e.g. for controlling currents in command coils · CPC title
by using a boost voltage source · CPC title
for preventing bouncing of the valve needle · CPC title
Details not otherwise provided for · CPC title
using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10900435B2 cover?
- In a drive unit of a fuel injection device, an electric current is supplied to the fuel injection device by applying a high voltage to the fuel injection device from a high voltage source whose voltage is boosted to a voltage higher than a battery voltage at the time of opening a valve of the fuel injection device. Thereafter, the electric current supplied to the fuel injection device is lowere…
- Who is the assignee on this patent?
- Hitachi Automotive Systems Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02D41/20. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 26 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).