ENGINE SYSTEM, VEHICLE, METHOD OF CONTROLLING ENGINE SYSTEM, AND COMPUTER PROGRAM PRODUCT

An engine system is provided, which includes a supercharger (33) driven by a crankshaft (7) of an engine, an electromagnetic clutch (34) disconnectably connecting the crankshaft to the supercharger, and a controller (100) configured to output a control signal to the electromagnetic clutch. The controller includes a processor configured to execute an uphill-angle detecting module (106) to detect an uphill angle during traveling of a vehicle, an uphill determining module (103) to determine whether the detected uphill angle is above a given first uphill angle, and a boost controlling module (107) to, when the detected uphill angle is above the first uphill angle, control the electromagnetic clutch to connect the crankshaft to the supercharger even when a target torque of the engine is within a non-boosting range.