# US 11,306,675 B2 · Injection control device

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- Number: US 11,306,675 B2
- Document ID: US11306675B2
- Status: Granted
- Kind: B2
- Application number: 17/357,276
- Filed: 2021-06-24
- Published: 2021-12-30
- Granted: 2022-04-19
- Earliest claimed: 2020-06-29
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Yuki Kato; Yohei Suganuma; Hiroyuki Fukuda
- Web page: https://patentgrep.com/patent/US11306675B2

## CPC

- F02D 41/20: Output circuits, e.g. for controlling currents in command coils
- F02D 41/2451: {characterised by what is learned or calibrated}
- F02D 41/402: {Multiple injections}
- F02D 2041/2006: {by using a boost capacitor}
- F02D 2041/2058: {using information of the actual current value}
- F02D 2200/50: said parameters being related to the vehicle or its components
- Y02T 10/40: Engine management systems
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

In a current-driving of a fuel injection valve to inject fuel through a single injection or a multi-stage injection, an energization time correction amount is calculated by performing area correction on a current flowing through the fuel injection valve. The single injection is switched to the multi-stage injection when the single injection is consecutively performed under a predetermined condition.

## Claims

### Claim 1

An injection control device comprising:
an injection command unit that executes a current-drive of a fuel injection valve to inject fuel through a single injection or a multi-stage injection;
an area correction unit that calculates an energization time correction amount by performing area correction on a current flowing through the fuel injection valve when the injection command unit controls the fuel injection valve to inject the fuel through the single injection or the multi-stage injection; and
a multi-stage injection switch unit that switches from the single injection to the multi-stage injection when the single injection is consecutively performed under a predetermined condition.

### Claim 2 (depends on 1)

The injection control device according to claim 1, wherein:
the multi-stage injection switch unit switches from the single injection to the multi-stage injection under a condition that the single injection is consecutively performed for a predetermined time.

### Claim 3 (depends on 1)

The injection control device according to claim 1, wherein:
the multi-stage injection switch unit switches from the single injection to the multi-stage injection under a condition that the single injection is consecutively performed a predetermined number of times.

### Claim 4 (depends on 1)

The injection control device according to claim 1, further comprising:
a number-of-stages change unit that increases a number of stages of the multi-stage injection to perform the area correction by the area correction unit after the multi-stage injection switch unit switches from the single injection to the multi-stage injection.

### Claim 5 (depends on 1)

The injection control device according to claim 1, further comprising:
a number-of-stages learning unit that learns a number of stages of the multi-stage injection to perform the area correction by the area correction unit after the multi-stage injection switch unit switches from the single injection to the multi-stage injection.

### Claim 6 (depends on 1)

The injection control device according to claim 1, further comprising:
a charge amount determination unit that determines a charge amount of a charging unit that holds power to be supplied to the fuel injection valve; and
a number-of-stages change unit that increases a number of stages of the multi-stage injection according to a reduction state of the charge amount of the charging unit to perform the area correction by the area correction unit after the multi-stage injection switch unit switches from the single injection to the multi-stage injection.

### Claim 7 (depends on 1)

The injection control device according to claim 1, further comprising:
a charge amount determination unit that determines a charge amount of a charging unit that holds power to be supplied to the fuel injection valve; and
a number-of-stages learning unit that learns a number of stages of the multi-stage injection while increasing the number of stages of the multi-stage injection according to a reduction state of the charge amount of the charging unit to perform the area correction by the area correction unit after the multi-stage injection switch unit switches from the single injection to the multi-stage injection.

### Claim 8 (depends on 1)

The injection control device according to claim 1, further comprising:
one or more processors; and
a memory coupled to the one or more processors and storing program instructions that when executed by the one or more processors cause the one or more processors to provide at least: the injection command unit; the area correction unit; and the multi-stage injection switch unit.