CONTROL DEVICE OF DIRECT INJECTION INTERNAL COMBUSTION ENGINE

• US 20090118986A1
• Filed: 11/04/2008
• Published: 05/07/2009
• Est. Priority Date: 11/07/2007
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Kita, Masayuki
• Granted Patent: US 7,747,379 B2
• Time in Patent Office: Days
• US Class Current: 701/105
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02P 5/06 dependent on engine speed

Abstract

When engine rotation speed is increasing in a compression stroke injection mode, a control device determines that a crank angle at injection end timing of an injector deviates toward a delayed crank angle side and performs additional ignition at timing when (or immediately before or after) a crank angle at actual injection end timing of the injector of a present injection cylinder is reached. Thus, even when the crank angle at the injection end timing deviates toward the delayed crank angle side with respect to preset original ignition timing, a combustion state can be stabilized by performing the additional ignition at timing, at which a suitable stratified mixture gas is formed in a cylinder, through the execution of the additional ignition at the timing substantially the same as the actual injection end timing.

Claims

1. A control device of a direct injection internal combustion engine, the control device comprising:

an injection period setting means for setting an injection period of an injector, which injects fuel into a cylinder of the internal combustion engine, in accordance with at least a required fuel injection quantity;

a timing setting means for setting injection start timing of the injector and ignition timing of a spark plug such that injection end timing of the injector and the ignition timing of the spark plug have a predetermined relationship; and

an additional ignition controlling means for performing additional ignition of the spark plug at timing set based on actual injection end timing of the injector when rotation speed of the internal combustion engine increases.

2. The control device as in claim 1, wherein

the additional ignition controlling means performs the additional ignition at timing that is the same as the actual injection end timing of the injector.

3. The control device as in claim 1, wherein

the additional ignition controlling means performs the additional ignition at timing when a predetermined period elapses after the actual injection end timing of the injector.

4. The control device as in claim 1, wherein

the additional ignition controlling means performs the additional ignition a plurality of times at a predetermined interval or at predetermined intervals.

5. A control device of a direct injection internal combustion engine that sets an injection period of an injector, which injects fuel into a cylinder of the internal combustion engine, in accordance with at least a required fuel injection quantity and that sets injection start timing of the injector and ignition timing of a spark plug such that injection end timing of the injector and the ignition timing of the spark plug have a predetermined relationship, the control device comprising:

a rotation speed increasing degree determining means for sensing or predicting a rotation speed increasing degree of the internal combustion engine;

an injection end timing predicting means for predicting the injection end timing of the injector based on the rotation speed increasing degree sensed or predicted by the rotation speed increasing degree determining means; and

an additional ignition controlling means for performing additional ignition of the spark plug at timing set based on the injection end timing predicted by the injection end timing predicting means.

6. The control device as in claim 5, wherein

the additional ignition controlling means performs the additional ignition at timing that is the same as the injection end timing predicted by the injection end timing predicting means.

7. The control device as in claim 5, wherein

the additional ignition controlling means performs the additional ignition at timing when a predetermined period elapses after the injection end timing predicted by the injection end timing predicting means.

8. The control device as in claim 5, wherein

the additional ignition controlling means performs the additional ignition a plurality of times at a predetermined interval or at predetermined intervals.