# US 9,752,527 B2 · Fuel injection device

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- Number: US 9,752,527 B2
- Document ID: US9752527B2
- Status: Granted
- Kind: B2
- Application number: 14/689,395
- Filed: 2015-04-17
- Published: 2015-10-29
- Granted: 2017-09-05
- Earliest claimed: 2014-04-23
- Assignees: Keihin Corporation
- Applicants: Keihin Corporation
- Inventors: Takayuki Shimatsu
- Web page: https://patentgrep.com/patent/US9752527B2

## CPC

- F02D 41/3005: {Details not otherwise provided for}
- F02D 41/20: Output circuits, e.g. for controlling currents in command coils
- F02M 51/061: {using electromagnetic operating means}
- F02D 2041/2034: {Control of the current gradient}
- F02D 2041/2055: {with means for determining actual opening or closing time}
- F02D 2041/2058: {using information of the actual current value}
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A fuel injection device includes: a current control section which turns off a current which is applied by a current output section such that a timing at which fuel injection of a fuel injection section is ended becomes a timing coinciding with a timing at which fuel injection is ended in a case where a current is turned off from a predetermined current amount at which continuation of the fuel injection of the fuel injection section becomes possible, in a case where a fuel injection ending request timing of the fuel injection section is in a time domain in which a current which is applied by the current output section changes transiently.

## Claims

### Claim 1

A fuel injection device comprising:
a current output section configured to output current for a request time based on control by a current control section; and
a fuel injection section configured to inject fuel base on the current output by the current output section,
where, in a case where an end timing of the request time is in a third time domain in which the current which is applied by the current output section changes transiently, the third time domain being between a first time domain where the current output section applies a first current amount to allow the fuel injection section to inject the fuel and a second time domain where the current output section applies a second current amount to allow the fuel injection section to continue to inject the fuel, the current control section being configured to correct the end timing of the request time by a correction amount based on the first current amount, the second current amount, and a period of the third time domain.

### Claim 2 (depends on 1)

The fuel injection device according to claim 1,
wherein the current control section is configured to correct the end timing of the request time to become earlier at the correction amount, the correction amount being set to be linearly changed from maximum in a case where the end timing of the request time is at a start point of the third time domain, to zero in a case where the end timing of the request time is at an end point of the third time domain.

### Claim 3 (depends on 1)

The fuel injection device according to claim 1, further comprising:
a time monitoring section configured to identify a current timing with a timing at which the current output section begins to apply a current as a starting point;
a current detection section configured to detect a current amount of a current which is applied by the current output section; and
a current amount writing section configured to record the current timing identified by the time monitoring section and the current amount of a current, which is applied by the current output section, detected by the current detection section and corresponding to the current timing, in a storage section with the current timing and the current amount correlated with each other.