Hybrid electric vehicle and method of controlling driving of the same

A method of controlling driving of a hybrid electric vehicle including an engine configured to generate power via injecting fuel in the engine, a driving motor configured to generate power via power from a battery;

• an engine clutch positioned between the engine and the driving motor to engage and disengage the engine and the driving motor;
• an integrated starter and generator, which serves as an integrated starter and generator for starting the engine or generating power, the integrated starter and generator including a starter and generator clutch configured to engage and disengage the integrated starter and generator and the engine, and a turbocharger including a turbine rotated via exhaust gas introduced in an exhaust manifold and an air compressor configured to compress air to transfer the compressed air to an air intake of the engine, the method comprising:
• transferring, by a controller, torque of the integrated starter and generator to the air compressor of the turbocharger through a decelerator to rotate the air compressor while the engine is being started;
• controlling, by the controller, the starter and generator clutch to disengage the connection between the engine and the integrated starter and generator after the engine is started;
• transferring, through a belt of a starter and generator clutch, power from the engine to the integrated starter and generator or blocking the transference of power from the engine to the integrated starter and generator;
• when the battery needs to be charged, transferring the torque from the turbine to the integrated starter and generator through the decelerator and forcing the integrated starter and generator to rotate via the torque of the turbine to generate power;
• when the amount of generated power of the integrated starter and generator by the torque of the turbine is insufficient to charge the battery, transferring the power of the engine to the integrated starter and generator so that power is generated via power from the engine by controlling the starter and generator clutch accordingly;
• when the hybrid electric vehicle runs below a predetermined speed/predetermined torque or is accelerating, and the engine is connected with the integrated starter and generator, disengaging the connection between the engine and the integrated starter and generator;
• and
• controlling the integrated starter and generator and the decelerator so that the torque from the integrated starter and generator is transferred to the air compressor through the decelerator to increase an amount of intake air supplied to the engine by the air compressor.