# US 10,309,338 B2 · Fuel injection control device for direct-injection engine

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- Number: US 10,309,338 B2
- Document ID: US10309338B2
- Status: Granted
- Kind: B2
- Application number: 15/558,847
- Filed: 2016-03-16
- Published: 2018-03-01
- Granted: 2019-06-04
- Earliest claimed: 2015-03-23
- Assignees: Mazda Motor Corporation
- Applicants: Mazda Motor Corporation
- Inventors: Takeshi Nagasawa; Noriyuki Ota; Kenji Uchida; Ryohei Ono; Kiyotaka Sato; Hidefumi Fujimoto
- Web page: https://patentgrep.com/patent/US10309338B2

## CPC

- F02D 41/402: {Multiple injections}
- F02B 17/005: {having direct injection in the combustion chamber}
- F02D 41/2096: {for controlling piezoelectric injectors (drive and control circuit for piezoelectric devices in general H10N30/802)}
- F02D 41/3041: {with means for triggering compression ignition, e.g. spark plug}
- F02D 41/38: of the high pressure type
- F02D 41/401: {Controlling injection timing (F02D41/402 takes precedence)}
- F02D 2041/389: {for injecting directly into the cylinder}
- F02D 2200/101: Engine speed
- F02M 51/0603: {using piezoelectric or magnetostrictive operating means}
- 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)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A fuel injection valve (6) is configured such that the effective opening area of an injection port (61) increases as its lift amount increases. A fuel injection control unit (an engine control unit 100) injects fuel in a lift amount changing mode wherein, when fuel is injected into a combustion chamber (17) in the terminal period of the compression stroke, the lift amount of the fuel injection valve is set to a predetermined large lift amount in the earlier period of the injection period, and in the later period of the injection period following the earlier period of the injection period, the lift amount is set to a small lift amount smaller than the large lift amount and is in a range where the fuel injection speed increases.

## Claims

### Claim 1

A fuel injection control device for a direct-injection engine, the fuel injection control device comprising:
an engine body having a combustion chamber defined by a ceiling portion of a cylinder head, a cylinder provided to a cylinder block, and a piston reciprocating in the cylinder; and
a fuel injection controller having a fuel injection valve disposed so as to inject liquid fuel into the combustion chamber, and configured to inject the fuel into the combustion chamber at a predetermined timing, wherein
the fuel injection valve is configured such that an effective opening area of an injection port through which the fuel is injected increases as a lift amount of the fuel injection valve increases, and
the fuel injection controller
injects the fuel in a lift amount changing mode in which, when the fuel is injected into the combustion chamber in a terminal period of a compression stroke, the lift amount of the fuel injection valve is set to a predetermined large lift amount in an earlier period of an injection period, and in a later period of the injection period following the earlier period of the injection period, the lift amount is set to a small lift amount smaller than the large lift amount and is in a range where a fuel injection speed increases, and
performs, when the engine body is operated at a rotational speed which falls within a predetermined high rotational speed range, a second-stage injection in which the fuel is injected in the lift amount changing mode, and before the second-stage injection, a first-stage injection in which the fuel is injected with a lift amount smaller than the large lift amount for an injection period longer than and spaced apart from the second-stage injection.