JP2017166493A5

JP2017166493A5 -

Info

Publication number: JP2017166493A5
Application number: JP2017126799A
Authority: JP
Filing date: 2017-06-28
Publication date: 2017-11-02
Anticipated expiration: 2033-07-04

Claims

A fuel injection valve (21) for directly injecting fuel into the combustion chamber (23); and ignition means (34) for generating an ignition spark in the combustion chamber, wherein the fuel injected from the fuel injection valve is A control device (40) for an in-cylinder injection engine (10) provided for combustion by ignition of an ignition means,
First injection control means for performing a plurality of first injections by the fuel injection valve so as to form a lean air-fuel ratio mixture in the combustion chamber before ignition of the ignition means in one combustion cycle of the engine; ,
A second injection control means for performing a second injection by the fuel injection valve so as to form a rich air-fuel ratio mixture in the combustion chamber before ignition of the ignition means and after the first injection;
With
The first injection control means is configured to form a leaner mixture than the first injection performed after the first injection performed before the first injection of the plurality of times. The first injection is performed , and when the first injection is performed, the fuel divided as the injection amount of the second injection is subtracted from the total injection amount of the one combustion cycle, and the remaining amount thereafter The injection amount of the first injection is calculated ,
The control apparatus for an in-cylinder injection engine, wherein the second injection control means performs the second injection only once immediately before the ignition timing by the ignition means.

When the first injection is performed, the first injection control means subtracts the fuel divided as the injection amount of the second injection from the total injection amount of the first combustion cycle, and then uses the remaining amount thereafter to the first injection. The in-cylinder injection engine control device according to claim 1, wherein the injection amount of each first injection is calculated by dividing according to the number of injections.

The in-cylinder injection engine control device according to claim 1 or 2, wherein the second injection control means sets an injection amount in the second injection based on an operating state of the engine.

Means for calculating combustion variation based on in-cylinder combustion pressure, rotation variation or torque variation of the engine;
The in-cylinder injection engine control device according to any one of claims 1 to 3, wherein the second injection control means increases the injection amount in the second injection as the combustion variation is larger.

The in-cylinder injection according to any one of claims 1 to 4, wherein an air-fuel mixture that is lean as a whole of the combustion chamber is formed in the one combustion cycle by the plurality of first injections and the second injections. Engine control device.

The first injection control means performs the plurality of first injections in an intake stroke of the engine,
The in-cylinder injection engine control device according to any one of claims 1 to 5, wherein the second injection control unit performs the second injection in a compression stroke of the engine.