Patent ID: 7854217

Claim:
An idling control device of a spark ignition type internal combustion engine capable of changing an actual compression ratio, wherein said device comprises an ignition timing control device which maintains an ignition timing at a reference ignition timing determined in advance in accordance with an operating condition of the engine when an engine speed is maintained at a target idling speed at the time of idling operation and which changes the ignition timing to an advance or retard side temporarily with respect to the reference ignition timing so that when the engine speed deviates from the target idling speed, the engine speed becomes the target idling speed, and when the actual compression ratio is changed at the time of idling, at least one of ratio of an amount of change of the ignition timing with respect to an amount of deviation of the engine speed from the target idling speed or the reference ignition timing is changed in accordance with the actual compression ratio so that when the engine speed deviates from the target idling speed, an amount of change of a generated torque of the engine due to the change of the ignition timing becomes substantially the same regardless of the actual compression ratio.