Flame-cut detecting device for internal combustion engine

A flame-cut detecting device for an internal combustion engine comprising:

• sensors for sensing an operating condition of said internal combustion engine,
• operating area detecting means for detecting a divided operating area, on the basis of the rotation information of said internal combustion engine,
• control parameter calculating means for calculating a control parameter of said internal combustion engine, on the basis of the operating condition sensed by said sensors,
• an igniter for igniting said internal combustion engine in accordance with the control parameter,
• an ion current detector for detecting an ion current produced by ignition of said internal combustion engine,
• a first flame-cut determination means for determining a flame-cut of said internal combustion engine on the basis of a temporal change of the rotation information of said internal combustion engine contained in the operating condition sensed by said sensors,
• a second flame-cut determination means for determining a flame-cut of said internal combustion engine on the basis of the ion current, and
• flame-cut determination selecting means for selectively employing said first or second flame-cut determination means in accordance with the operating area, wherein
• when said operating area detecting means detects the operating area that is less than or equal to a predetermined rotation number, said flame-cut determination selecting means determines the flame-cut in accordance with a logical product between a detection result of said first flame-cut detecting means and a detection result of said second flame-cut detecting means.