ENGINE

摘要

It is an object to provide an engine that makes it possible to constantly detect the number of rotations of a supercharger with a calculation load of an ECU reduced. An engine (1) is provided with an engine base (8) comprised of a plurality of cylinders and a turbocharger (7), a crank angle sensor (4), a turbo sensor (5) that detects rotations of the turbocharger (7) as pulses, an amplifier (11) that divides the pulses by an arbitrary division ratio and calculates the divided pulses, and an ECU(10) that judges a surge condition of the turbocharger (7), wherein the ECU (10) sets a predetermined position of a piston of each cylinder in a crank angle of the engine base (8) to count start timing of the divided pulses, outputs the divided pulses counted from the count start timing to the number of predetermined rotations as a first output, and judges that, if a difference between the first outputs at every cylinder is more than a predetermined value, the turbocharger (7) is in the surge condition.