ENGINE CONTROL DEVICE

To accurately detect occurrence of erroneous detection of a crank pulse associated with dropout of a crank pulse or occurrence of noise. A cogless section is provided in cogs provided on an outer periphery of a crankshaft for transmitting a crank pulse. Occurrence of erroneous detection of a crank pulse is detected through use of an instantaneous rotational speed of the crankshaft computed from a crank pulse assigned to the cogless section and crank pulses assigned to cogs before and after the cogless section. When too few crank pulses are detected, a rapid increases arises in the instantaneous rotational speed of the crankshaft computed from the crankpulses after occurrence of a rapid decrease. The number of detected cramp pulses-which are fewer than the original crank pulses-is detected from the number of crank pulses existing between occurrence of a rapid decrease and occurrence of a rapid increase. When a too many crank pulses are detected, a rapid decrease arises in the instantaneous rotational speed of the crankshaft after occurrence of a rapid increase. The number of detected crank pulses-which are greater in number than the original crank pulses-is detected from the number of crank pulses existing between occurrence of a rapid increase and occurrence of a rapid decrease.