Patent ID: 8191370

Claim:
An engine including a supercharger comprising: a compressor having a plurality of blades on a turbine shaft and a turbine; at least one index means provided on the turbine shaft or the blades, a detection means, which detects a rotation of the index means and a rotation of the plurality of blades respectively; a turbo angular velocity computing means, which calculates the angular velocity by receiving a plurality of pulses per one rotation of the turbine shaft; an engine load detecting means for detecting the engine load; an engine rotation number detecting means for detecting the engine rotation number; an adequate turbo rotation number threshold preliminary set up using the engine load and the engine rotation number; and a supercharger fault detection means, wherein the supercharger fault detection means evaluates that the supercharger is abnormal when the turbo rotation number detected by the turbo angular velocity detecting means is beyond the adequate turbo rotation number threshold on the condition of the engine based on the engine load detected by the engine load detecting means and the engine rotation number detected by the engine rotation number detecting means.