| 摘要 |
PCT No. PCT/JP93/01386 Sec. 371 Date Jun. 20, 1994 Sec. 102(e) Date Jun. 20, 1994 PCT Filed Sep. 29, 1993 PCT Pub. No. WO94/08134 PCT Pub. Date Apr. 14, 1994A control system is provided for an internal combustion engine which can stop the supply of fuel to some of its cylinders to perform part cylinder operation in a particular state of operation, The control system promptly stabilizes the engine speed after effecting switching between full cylinder operation and part cylinder operation and also stabilizes an idle speed with good responsibility by correcting the ignition timing. The control system calculates basic ignition timing, the difference between a smoothed engine speed and the engine speed, and an ignition timing correction amount corresponding to the difference at least in the course of the idling. The control system further includes an ignition timing correction control system for controlling the manner of operation of the calculation of the ignition timing correction amount upon at least one of the switching between the full cylinder operation and the part cylinder operation, and the part cylinder operation. The control system also calculates a target ignition timing on the basis of the basic ignition timing and the ignition timing correction amount, and drives the ignition drive for the respective cylinders.
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