JP2013032788A5 - Fuel injection type internal combustion engine - Google Patents

Description

The present invention relates to a fuel injection type internal combustion engine including an in-cylinder fuel injection device and an intake passage fuel injection device.

The present invention solves the above problems comprises a cylinder fuel injector and an intake manifold fuel injection device, can be reduced and the combustion stable during cold start, the HC (hydrocarbon component) contained in the exhaust gas An object is to provide a fuel injection type internal combustion engine .

In order to solve the above problems, the present invention has a fuel injection type internal combustion engine configured as follows.

A fuel injection type internal combustion engine includes an intake passage fuel injection device that injects fuel into an intake passage communicated with a combustion chamber, an in-cylinder fuel injection device that faces the combustion chamber and directly injects fuel into the combustion chamber, It has.
The fuel injection type internal combustion engine has a catalyst temperature increase control for increasing the temperature of the catalyst connected to the exhaust passage communicating with the combustion chamber after the cold start. In the catalyst temperature increase control, until the predetermined time after the cold start elapses, the temperature increase control of the compression sludge lean combustion by the in-cylinder fuel injection device is performed, and after the predetermined time elapses, the fuel injection device in the intake passage and the in-cylinder Temperature rise control is performed with the fuel injection device.

The catalyst temperature increase control includes control for delaying the ignition timing, and the air-fuel ratio and ignition timing at the time of temperature increase control of the compression slur lean combustion by the in-cylinder fuel injection device, and the fuel injection device in the intake passage after a predetermined time elapses. And the air-fuel ratio and ignition timing at the time of temperature rise control by the in-cylinder fuel injection device are made substantially equal.

Further, in the catalyst temperature increase control, when the in-cylinder fuel injection device is defective, the temperature increase control by the in-cylinder fuel injection device is not performed, but the temperature increase control only by the intake passage fuel injection device is performed.

This onset Ming, has the following effect. Provided is a fuel injection type internal combustion engine that is provided with an in-cylinder fuel injection device and a fuel injection device in an intake passage and that is capable of reducing stable combustion during cold start and reducing HC (hydrocarbon component) contained in exhaust gas. Can do.

It is a sectional view showing a fuel jetting-type internal combustion engine according to an embodiment of the present invention. It is a flowchart which shows the fuel-injection control method of the fuel-injection type internal combustion engine . It is a figure which shows the operating state of a fuel injection type internal combustion engine.

A fuel injection type internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a combustion chamber portion of the engine 10. The engine 10 is a fuel injection type spark ignition type internal combustion engine having an intake passage fuel injection device in an intake passage and an in-cylinder fuel injection device and a spark plug in a combustion chamber. The engine 10 uses gasoline as a main fuel, and includes an exhaust purification device in an exhaust passage.

Claims (3)

An intake passage fuel injector for injecting fuel into communicating with the combustion chamber intake passage,
Said to face the combustion chamber, the cylinder fuel injection device for directly injecting fuel into the combustion chamber, in Bei example fuel injection type internal combustion engine,
After the cold start , having a catalyst temperature increase control for increasing the temperature of the catalyst connected to the exhaust passage communicating with the combustion chamber,
The catalyst temperature increase control is performed until the predetermined time after the cold start elapses, and the temperature increase control of the compressed slean lean combustion by the in-cylinder fuel injection device is performed. After the predetermined time elapses, the fuel injection device in the intake passage And a fuel injection type internal combustion engine , wherein temperature rise control is performed by the in-cylinder fuel injection device . The catalyst temperature increase control includes control for delaying the ignition timing, and the air-fuel ratio and ignition timing at the time of temperature increase control of the compression slur lean combustion by the in-cylinder fuel injection device, and the fuel in the intake passage after a predetermined time elapses. 2. The fuel injection type internal combustion engine according to claim 1, wherein the air-fuel ratio and the ignition timing at the time of temperature rise control by the injection device and the in-cylinder fuel injection device are substantially equal . In the catalyst temperature increase control, when the malfunction of the in-cylinder fuel injection device is not performed, the temperature increase control by the in-cylinder fuel injection device is not performed, but the temperature increase control by only the intake passage fuel injection device is performed. The fuel injection type internal combustion engine according to claim 1 or 2.