Cylinder recognition apparatus for an internal combustion engine

摘要

A cylinder recognition apparatus for a multi-cylinder internal combustion engine has a position sensor which generates for each cylinder output pulses which indicate prescribed positions of the piston of the cylinder. The output pulse for a prescribed reference cylinder of the engine has a different pulse width from the pulses for the other cylinders. A cylinder recognition circuit calculates a ratio which is a function of the pulse width and the period of each output pulse. A comparator compares the ratio with a prescribed value and a cylinder is recognized on the basis of the comparison.